Part #470656
IG/IGX Make-Up Air Unit
®
Installation, Operation and Maintenance Manual
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions
could result in personal injury and/or property damage! Retain instructions for future reference.
General Safety Information
Only qualified personnel should install this unit.
Personnel should have a clear understanding of these
instructions and should be aware of general safety
precautions. Improper installation can result in electric
shock, possible injury due to coming in contact with
moving parts, as well as other potential hazards.
Other considerations may be required if high winds
or seismic activity are present. If more information
is needed, contact a licensed professional engineer
before moving forward.
DANGER
Always disconnect power before working on or
near a unit. Lock and tag the disconnect switch or
breaker to prevent accidental power up.
CAUTION
When servicing the unit, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.
1. Follow all local electrical and safety codes, as well
as the National Electrical Code (NEC), the National
Fire Protection Agency (NFPA), where applicable.
Follow the Canadian Electrical Code (CEC) in
Canada.
2. The rotation of the wheel is critical. It must be free
to rotate without striking or rubbing any stationary
objects.
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Do not touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
3. Motor must be securely and adequately grounded.
FOR YOUR SAFETY
4. Do not spin fan wheel faster than the maximum
cataloged fan rpm. Adjustments to fan speed
significantly affects motor load. If the fan RPM is
changed, the motor current should be checked to
make sure it is not exceeding the motor nameplate
amps.
The use and storage of gasoline or other
flammable vapors and liquids in open
containers in the vicinity of this appliance is
hazardous.
WARNING
5. Do not allow the power cable to kink or come
in contact with oil, grease, hot surfaces, or
Improper installation, adjustment,
alteration, service or maintenance can
cause property damage, injury or death.
Read the installation, operating and
maintenance instructions thoroughly before
installing or servicing this equipment.
chemicals. Replace cord immediately if damaged.
6. Verify that the power source is compatible with the
equipment.
7. Never open blower access doors while the fan is
running.
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3. After storage period, purge grease before putting
fan into service.
Sequence of Operation, Furnace –
2:1 Staged . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
2:1 Modulation . . . . . . . . . . . . . . . . . . . . . . 39-40
Operation of Controller –
4:1 Modulation/8:1 Staged Controller. . . . 40-41
Sequence of Operation, Furnace –
4:1 Modulation . . . . . . . . . . . . . . . . . . . . . . 41-42
8:1 Staged . . . . . . . . . . . . . . . . . . . . . . . . . 43-44
Ignition Controller . . . . . . . . . . . . . . . . . . . . . . . . . .44
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Indirect Gas Fired Unit Installations
Units are listed for installation in the United States and
Canada.
• Installation of gas fired duct furnaces must conform
with local building codes. In the absence of local
codes, installation must conform to the National
Fuel Gas code, ANSI Z223.1 or in Canada, CAN/
CGA-B149 installation codes.
Troubleshooting
Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Motor Over Amps . . . . . . . . . . . . . . . . . . . . . . . . . .47
Insufficient / Too Much Airflow. . . . . . . . . . . . . . . .48
Excessive Noise / Vibration . . . . . . . . . . . . . . . . . .49
Furnace – Staged . . . . . . . . . . . . . . . . . . . . . . . . . .50
2:1 Modulation. . . . . . . . . . . . . . . . . . . .51
4:1 Modulation. . . . . . . . . . . . . . . . . 52-53
8:1 Staged . . . . . . . . . . . . . . . . . . . . 54-55
Optional Evaporative Cooling. . . . . . . . . . . . . . . . .56
Optional Water Wizard™ . . . . . . . . . . . . . . . . . . . .57
• All electrical wiring must be in accordance with the
regulation of the National Electrical Code, ANSI/
NFPA 70.
• Unit is approved for installation downstream from
refrigeration units. In these conditions, condensate
could form in the duct furnace and provision must be
made to dispose of the condensate.
Maintenance
Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58-59
Fall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60-61
Table of Contents
Installation
Reference
Clearance to Combustibles/Service Clearances. . .3
Indoor Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Unit Arrangement DB / HZ . . . . . . . . . . . . . . . . . . 4-5
Roof Mounted Unit – Arrangement DBC . . . . . . . 5-6
Optional Evaporative Cooling Module. . . . . . . . . . .7
Venting – Outdoor . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Indoor, All Units. . . . . . . . . . . . . . . . . . . . .8
Vent Connections . . . . . . . . . . . . . . . . . . . . . . . . . .62
Model IG – Single or 2 Stage . . . . . . . . . . . . . . . . .63
8:1 Staged . . . . . . . . . . . . . . . . . . . . . .64
2:1 Modulation . . . . . . . . . . . . . . . . . . .65
4:1 Modulation . . . . . . . . . . . . . . . . . . .66
Model IGX – Blower Control Center. . . . . . . . . . . .67
Single or 2 Stage . . . . . . . . . . . . . . . . .68
Standard Indoor . . . . . . . . . . . . . . . . . . . .9
Concentric, General . . . . . . . . . . . . . . . .10
Concentric, Horizontal . . . . . . . . . . . 10-11
Concentric, Vertical. . . . . . . . . . . . . . 11-12
Two Pipe, Horizontal. . . . . . . . . . . . . . . .13
Two Pipe, Vertical . . . . . . . . . . . . . . . . . .14
8:1 Staged . . . . . . . . . . . . . . . . . . . . . .68
2:1 Modulation . . . . . . . . . . . . . . . . . . .69
4:1 Modulation . . . . . . . . . . . . . . . . . . .69
Performance Table . . . . . . . . . . . . . . . . . . . . . . . . .70
Start-Up Checklist. . . . . . . . . . . . . . . . . . . . . . . . . .71
Maintenance Log . . . . . . . . . . . . . . . . . . . Backcover
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . Backcover
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . 15-16
Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Optional Evaporative Cooler Piping. . . . . . . . . 18-19
Optional Water Wizard™ . . . . . . . . . . . . . . . . . 19-20
Optional Direct Expansion (DX) Coil Piping. . . 20-21
Optional Chilled Water Coil Piping. . . . . . . . . . . . .22
Optional Building Pressure Control . . . . . . . . . . . .22
Clearance to Combustibles /
Service Clearances
Floor
0 inches 0 inches 0 inches 0 inches
(0 mm) (0 mm) (0 mm) (0 mm)
Top
Sides
Ends
Start-Up
Indirect Fired
Units*
Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-24
Furnace – All Units . . . . . . . . . . . . . . . . . . . . . . . . .25
Single Stage. . . . . . . . . . . . . . . . . . . . . .25
Clearance to combustibles is defined as the minimum
distance required between the heater and adjacent
combustible surfaces to ensure the adjacent surface’s
temperature does not exceed 90 degrees above the ambient
temperature.
2:1 Staged . . . . . . . . . . . . . . . . . . . . . . .26
8:1 Staged . . . . . . . . . . . . . . . . . . . . 26-28
2:1 Modulation. . . . . . . . . . . . . . . . . . . .29
4:1 Modulation. . . . . . . . . . . . . . . . . 30-31
*Reference venting guidelines for combustion blower clearances.
Optional Economizer . . . . . . . . . . . . . . . . . . . . . . .32
Optional Evaporative Cooling. . . . . . . . . . . . . . . . .33
Optional Water Wizard™ . . . . . . . . . . . . . . . . . 34-35
Recommended Minimum Service Clearances
Housing 32
and less
42 inches (1067 mm) on the
controls side of the unit
Operation
Optional Water Wizard™ . . . . . . . . . . . . . . . . . . . .35
Optional VAV Units . . . . . . . . . . . . . . . . . . . . . . . . .36
Optional Recirculating Units. . . . . . . . . . . . . . . . . .37
Clearances for component removal (such as evaporative
cooler media) should be 6 in. wider than the width of the
module itself.
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Installation of Indoor Unit
Installation of Arrangement DB / HZ
1. Install Curb and/or Equipment
Support(s)
NOTE
To prevent premature heat exchanger failure, do not
locate units where chlorinated, halogenated, or acid
vapors are present.
Position curb/equipment support(s) on the roof
(reference the CAPS submittal for placement of curb/
equipment support(s) in relation to the unit). Verify that
unit supports are level, shim if necessary. Attach curb
to roof and flash into place. Attach the equipment
support(s) to the roof, remove metal cover, flash to
wooden nailer and reinstall cover.
1. Install Hangers
Install threaded hangers from ceiling supports. When
locating hangers, allow enough room to open access
panel(s). Two nuts must be used on the end of each
threaded hanger. Ceiling supports are supplied by
others.
Roof Curb
Metal Cover
2. Install Unit
Raise the unit into place. Using two nuts per hanger,
fasten the unit supports to hangers under the unit.
Appropriate unit supports, such as the optional
manufacturer hanging bracket kit or c-channel and
angle iron (supplied by others) should be used.
Equipment
Support
Roof Curb and Equipment Support
Using self-tapping screws, attach ductwork to unit. In
order to prevent the unit from swinging and to provide
a safe environment for service and maintenance,
additional measures must be taken to secure the unit
in all directions.
2. Install Ductwork
Good duct practices should be followed for all
ductwork. All ductwork should be installed in
accordance with SMACNA and AMCA guidelines,
NFPA 96 and all local codes. Reference the CAPS
submittal for ductwork sizes.
Ductwork
Ceiling Supports
Supply Air Ductwork
(Arrangement DB only)
Hangers
Ductwork
NOTE
Unit Supports
The use of a duct adapter is recommended on a
downblast (DB) arrangement to align the ductwork
with the supply unit. The duct adapter is only a
guide and is not to be used as support for the
ductwork.
Indoor Mounting
NOTE
Two nuts must be used on each end of each
threaded hanging rod for proper support.
WARNING
3. Apply Sealant
Apply an appropriate sealant around the perimeter of
the curb and duct adapter(s) to isolate fan vibration
and prevent water penetration.
All factory-provided lifting lugs must be used when
lifting any unit. Failure to comply with this safety
precaution could result in property damage, serious
injury or death.
4. Install Unit
Use a crane and a set of
spreader bars
NOTE
Good duct practices should be followed for
all ductwork. Ductwork should be installed in
accordance with SMACNA and AMCA guidelines,
NFPA 96 and any local codes. Reference the CAPS
submittal for duct sizes.
hooked to the
factory lifting lugs
to lift and center
the unit on the
curb/equipment
support(s).
3. Install Vent Piping
Refer to the Indoor Venting Instructions. Refer to your
unit submittal to determine the correct venting option.
Use self-tapping
sheet metal
screws to fasten
the unit to the
curb/equipment
NOTE
Vent piping is supplied by others and not supplied
by manufacturer.
support(s).
Setting Unit
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2. Install Combination Curb Adaptor
Install combination curb adaptor over curb, use wood
screws to lag in place. Locate extension so the tall
louvered side is over the exhaust opening, as shown
in illustration. Caulk extension to combination curb
adaptor. Fasten extension to curb adaptor with #12
sheet metal screws (field provided).
NOTE
The use of all lifting lugs and a set of spreader bars
is mandatory when lifting the unit.
NOTE
Some units come with the weatherhood attached
and step 5 may not apply.
Exhaust
1 inch
Inside
Flange
5. Assemble and Attach Weatherhood
The weatherhood can now be assembled and
attached to the unit. Detailed assembly instructions
can be found with the weatherhood. If the optional
evaporative cooling module was selected, this step
does not apply, refer to the installation instructions
for the Optional Evaporative Cooling Module section,
page 7.
Supply
6. Seal Weatherhood Seam
Using an appropriate sealant, seal the seam between
the weatherhood and the unit.
Combination Extension
3. Install Ductwork
Good duct practices should be followed for all
ductwork. All ductwork should be installed in
accordance with SMACNA and AMCA guidelines,
NFPA 96 and any local codes. Reference the CAPS
submittal for ductwork size and location.
Complete Rooftop Installation
Exhaust
Ductwork
by Others
Supply
Ductwork
by Others
Installation of Roof Mounted Unit
Arrangement DBC
1. Install Curb/Equipment Support(s)
Position curb/equipment support(s) on the roof
(reference the CAPS submittal for placement of curb/
equipment support(s) in relation to the unit). Verify
that all unit supports are level, shim if necessary.
Attach curb to roof and flash into place. Attach the
equipment support(s) to the roof, remove metal cover,
flash to wooden nailer and reinstall cover.
Ductwork
NOTE
The use of a duct adapter is recommended on a
downblast (DBC) arrangement to align the ductwork
with the supply unit. The duct adapter is only a guide
and is not to be used as support for the ductwork.
Roof Curb
Metal Cover
Equipment
Support
Roof Curb and Equipment Support
NOTE
Refer to Outdoor Venting instructions when locating
the unit.
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7. Install Supply Unit
Installation of Roof Mounted Unit
Arrangement DBC, continued
Use a crane and a set of spreader bars hooked to the
factory lifting lugs to lift and center the unit on the
extension/equipment support(s).
4. Apply Sealant
Use self-tapping sheet metal screws to fasten the unit
to the extension/equipment support(s).
Apply an appropriate sealant around the perimeter of
the curb and duct adapter(s) to isolate fan vibration
and prevent water penetration.
Exhaust Duct Installed
Sealant
Supply Duct with
Duct Adapter Installed
Sealing Ductwork
5. Install Exhaust Fan
Fasten exhaust fan to curb extension with self-tapping
sheet metal screws.
Installing Supply Unit
NOTE
Exhaust Fan
The use of all lifting lugs and a set of spreader bars
is mandatory when lifting unit.
NOTE
Be sure to complete the outdoor venting installation
instructions.
NOTE
Some units come with the weatherhood attached
and step 8 may not apply.
Installing Exhaust Fan
NOTE
8. Assemble and Attach Weatherhood
The weatherhood can now be assembled and/or
attached to the unit. Detailed assembly instructions
can be found with the weatherhood. If the optional
evaporative cooling module was selected, this step
does not apply, refer to the Installation Instructions
for the Optional Evaporative Cooling Module section,
page 7.
Installing the exhaust fan prior to the supply unit will
allow for easier installation of options.
6. Install Exhaust Options
Install optional hinge kit with restraining cables and
grease trap with drain connection.
9. Seal Weatherhood Seam
Using an appropriate sealant, seal the seam between
the weatherhood and the unit.
NOTE
NFPA 96 requires that the exhaust fan be hinged.
Complete Combination Installation
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Installation of Evaporative Cooling
Module (optional)
Installation of Venting for Outdoor
Units
NOTE
1. Follow Guidelines
All of the following guidelines must be followed when
installing the unit.
Small evaporative coolers ship attached to the base
unit and require no additional mounting.
1. Locate Equipment Support(s)
Position equipment support(s) on the roof (reference
WARNING
Do not install units in locations where flue products
can be drawn into adjacent building openings such
as windows, fresh air intakes, etc. Distance from
vent terminal to adjacent public walkways, adjacent
buildings, operable windows, and building openings
shall conform with the local codes. In the absence
of local codes, installation shall conform with the
National Fuel Gas Code, ANSI Z223.1, or the CAN/
CGA B-149 Installation Codes.
the CAPS submittal for
placement of equipment
support(s) in relation to
the unit). Verify that all unit
supports are level, shim if
necessary. Attach equipment
support to the roof, remove
metal cover, flash to wooden nailer and
reinstall cover.
Metal Cover
Equipment
Support
Equipment Support
Sealant
WARNING
2. Apply Sealant
Apply an appropriate sealant around the
airstream opening to create an air tight
seal.
The following guidelines must be followed for all
outdoor units:
1. Building materials that will be affected by flue
gases should be protected.
2. Maintain minimum horizontal clearance of 4 feet
from electric meters, gas meters, regulators,
and relief equipment. In Canada, the minimum
clearance is 6 feet.
Sealant
3. Set Evaporative Cooling Module
Use a crane and a set of spreader bars hooked to the
factory lifting lugs
to lift and center
the module on the
equipment support(s).
The flange on the
evaporative cooler
should overlap the
3. The combustion blower discharge on outdoor
units must be located a minimum of 42 inches
from any combustible materials.
4. Do not modify or obstruct the combustion
air inlet cover or the combustion blower
weatherhood.
flange on the unit.
Placing Evaporative Module
5. Do not add vents other than those supplied by
the manufacturer.
6. During the winter, keep the unit clear of snow to
prevent any blockage of the combustion venting.
NOTE
The use of all lifting lugs and a set of spreader bars is
mandatory when lifting the evaporative cooling module.
4. Secure Cooling Module to Unit
Use self-tapping screws to fasten the cooling module
to the base unit along the
top and down both sides.
Fasten at the top through
2. Install Stack (Optional)
Clearance may require an exhaust stack. Install an
exhaust stack as needed to the exhaust connection
on the unit. Install a vent terminal on the exhaust pipe.
the flanges. To fasten the
sides, the media must
be removed. To remove
the media, first remove
the access panel on
the evaporative module
Securing Evaporative Module
and disconnect the evaporative pump(s). The media
will now slide out. With the media removed, you can
access the side fastening points inside the evaporative
module. With all the screws in place, reinstall the media,
reconnect the pumps and reinstall the access panel.
NOTE
When mounting the evaporative cooler, it is
important that it is level to ensure proper operation
and water drainage.
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Venting Methods
Installation of Venting for Indoor
Units
There are three venting methods for indoor mounted
units. For each method, the units can be vented
horizontally through an exterior wall or vertically
through the roof. Specific venting instructions are
provided for each method and shown in the following
pages. Construct the vent system as shown in these
instructions. Refer to your unit specific submittal to
determine the applicable venting option.
WARNING
The following guidelines must be followed for all indoor
units:
1. Installation of venting must conform with local
building codes. In the absence of local codes,
installation must conform with the National Fuel
Gas Code, ANSI Z223.1 or in Canada, CAN/
CGA-B149 installations codes.
The venting method options are:
Standard Indoor Venting
•
•
•
uses building air for combustion
vents exhaust to outdoors
one exterior roof or wall penetration
2. For the exhaust pipe, use pipe approved for a
category III appliance or single wall, 26 gauge
or heavier galvanized vent pipe. The piping is
required to be gas tight by ANSI.
Separated Combustion Concentric Venting
3. For the combustion air pipe on separated
combustion units, sealed single-wall galvanized
air pipe is recommended.
4. The joints must be sealed with a metallic tape or
Silastic™ suitable for temperatures up to 350°F.
5. A minimum of 12 inches of straight vent pipe is
recommended after the exhaust connection and
before any elbows.
•
•
•
uses outside air for combustion
vents exhaust to outdoors
one exterior roof or wall penetration
Separated Combustion 2-Pipe Venting
•
•
•
uses outside air for combustion
vents exhaust to outdoors
two exterior roof or wall penetrations
6. Vertical combustion air pipes should be fitted with
a tee, drip leg and clean-out cap to prevent any
moisture in the combustion air pipe from entering
the unit.
7. To reduce condensation, insulate any vent runs
greater than 5 feet.
NOTE
For each method, the units can be vented
horizontally through an exterior wall or vertically
through the roof. Refer to the specific venting
instructions for your unit. Construct the vent system
as shown in these instructions.
8. All vent pipe connections should be made with at
least three corrosion resistant sheet metal screws.
9. Refer to the National Fuel Gas Code for additional
piping guidelines.
NOTE
Vent piping is supplied by others and not supplied
by manufacturer.
NOTE
The drip leg should be cleaned out periodically
during the heating season.
NOTE
Clearances from combustible material for indoor
units are determined by the National Fuel Gas Code
and/or other local codes.
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Vent Pipe Diameter
Select the vent pipe diameter. Use only the specified
pipe diameter.
Installation of Standard Indoor
Venting
Standard Indoor Venting uses one penetration through
an exterior wall or roof for venting the flue exhaust.
The combustion air is supplied from the air inside the
building. Units must not be installed in a potentially
explosive, flammable, or corrosive atmosphere. To
prevent premature heat exchanger failure, do not
locate unit where chlorinated, halogenated or acid
vapors are present.
Furnace Size Exhaust Pipe Diameter
(MBH)
75 - 175
200 - 400
(inches)
4
6
Installing Exhaust Vent Pipe
Install the vent pipe with a minimum downward slope
(from the unit) of 1/4-inch per foot (horizontal venting
only). Securely suspend the pipe from overhead
structures at points no greater than 3 feet apart.
The minimum vent length is 5 feet for horizontal and
10 feet for vertical. The maximum vent length is 70
feet. The total equivalent vent length must include
elbows. The equivalent length of a 4 inch elbow is 6
feet and the equivalent length of a 6 inch elbow is 10
feet. Attach the vent terminal to the end of the exhaust
pipe.
When units are installed in tightly sealed buildings,
provisions should be made to supply an adequate
amount of infiltration air from the outside. The rule of
thumb is that an opening of one square inch should be
provided for every 1000 BTUs per hour of input rating.
Vent terminals must be used. Construct the vent
system as shown in the drawings. Reference the Vent
Pipe Diameter table and Exhaust Vent Pipe table for
additional details.
Vent
Length
Minimum Maximum
Exterior
Wall
(feet)
(feet)
A = 12 inch minimum
5
70
Horizontal
Vertical
10
70
Pitch vent pipe
downward
from furnace
¼ inch per foot
A
EXHAUST
Air Inlet
Exhaust
Vent
Terminal
Standard Indoor Venting - Horizontal
A = 12 inch minimum
B = 12 inch minimum,
but should size
according to expected
snow depth
Exhaust Vent
Terminal
B
Roof Line
A
Air Inlet
Standard Indoor Venting - Vertical
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Installation of Concentric Venting
(General)
Concentric venting allows the exhaust pipe and
combustion air pipe to pass through a single hole in
the roof or wall of the building. A concentric venting
adapter (CVA) is required for concentric venting.
Concentric Venting – Horizontal
Refer to the diagram below for venting on horizontal
concentric systems. Maintain at least 12 inches from
the combustion air inlet guard to the exhaust vent
terminal (Dim. B). To prevent water from running
into the combustion air pipe and to allow for easy
installation of the combustion air inlet guard, the
combustion air pipe must terminate at least 2 inches
from the exterior surface of the outside wall (Dim. A).
The concentric venting adapter is designed for indoor
installations and should never be installed on the
exterior of the building.
The exhaust pipe must terminate with the vent
terminal. For horizontal venting, the combustion air
pipe must terminate with the combustion air guard.
For vertical venting, the combustion air pipe must
terminate with the inlet terminal. Depending on what
was ordered, one of these vent terminals will be
provided in the optional venting kit along with the
concentric venting adapter (CVA).
A = 2 inch minimum
Exterior
B = 12 inch minimum
Wall
Mounting
Bracket
A
B
EXHAUST
Exhaust
Vent
COMBUSTION AIR
Terminal
If venting vertically through the roof, refer to the
vertical concentric venting instructions. If venting
horizontally through the wall, refer to the horizontal
concentric venting instructions.
Mounting
Bracket
Combustion
Air Inlet Guard
Pitch vent pipe downward
from furnace 1/4 inch per foot
NOTE
Vent Connection Diameter
Vent piping is supplied by others and not supplied
by manufacturer.
Vent terminals must be used (one vent terminal
included with each furnace). Construct the vent
system as shown in the drawings and refer to the
table for the correct vent connection diameters.
Non-Concentric Vent
Concentric Vent
Connection Diameter Connection Diameter
Furnace
Size (MBH)
Exhaust Combustion Air Exhaust Combustion Air
(inches)
(inches)
(inches)
(inches)
4
6
4
6
4
6
6
8
75-175
200-400
Vent Length
CVA-4
CVA-6
Refer to table for minimum and maximum vent
lengths. The total equivalent vent length must include
elbows. The equivalent length of a 4 inch elbow is
6 feet and the
equivalent length
of a 6 inch elbow
is 10 feet.
4-inch Concentric
Venting Adapter
6-inch Concentric
Venting Adapter
Vent
Length
Minimum Maximum
(feet)
(feet)
Combustion Air Connection
Concentric Side
5
70
Exhaust Connection
Concentric Side
Horizontal
1. Determine Venting Location
Determine the location of the concentric venting
adapter (CVA) based on any clearances that must
be maintained (follow all codes referenced in these
instructions).
CVA
2. Attach Mounting Brackets
Attach field-supplied, corrosion resistant mounting
brackets to the CVA using corrosion resistant sheet
metal screws.
Combustion Air Connection
Non-Concentric Side
Exhaust Connection
Non-Concentric Side
Top View
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3. Install Exhaust Pipe
Concentric Venting – Vertical
Slide the exhaust pipe through the CVA. Provide
enough exhaust piping to pass through the wall (or
floor) and provide the minimum clearance of 12 inches
between the exhaust pipe termination and the
combustion air intake. With all required clearances
satisfied, attach the exhaust pipe to the CVA.
Refer to the diagram below for venting on vertical
concentric systems. Maintain at least 12 inches
between the top of the combustion air inlet terminals
and the bottom of the exhaust terminal. (Dim. B).
The bottom of the combustion air intake pipe must
terminate above the snow line or at least 12 inches
above the roof, whichever is greater.
INTAKE END
A tee with cleanout must be provided on the
combustion air and exhaust pipe to prevent debris
from entering the heat exchanger.
Exhaust Connection
(Model IGX)
Exhaust Connection
(Model IG)
A = 12 inch minimum, but
should size according to
expected snow depth
Exhaust Vent
Terminal
B = 12 inch minimum
C = 12 inch minimum
DISCHARGE
B
END
Combustion Air
Inlet Terminal
A
Roof Line
Mounting
Bracket
Mounting
Bracket
Combustion Air Connection
(Model IGX)
Combustion Air Connection
(Model IG)
4. Install Combustion Air Pipe
Attach a field-supplied combustion air pipe to the
concentric side of the CVA.
C
Be sure to provide enough combustion air piping
to pass through the wall and provide the minimum
clearance of 2 inches between the combustion air
intake and the exterior surface of the outside wall.
Tee with
drip leg and
clean-out cap
C
Be sure to maintain the minimum clearance of
12 inches between the exhaust pipe termination and
the combustion air intake.
Vent Connection Diameter
5. Install CVA Assembly
Vent terminals must be used. Construct the vent
system as shown in the drawings and refer to the
table for the correct vent connection diameters.
Place the CVA assembly through the wall and verify
that all minimum clearance requirements as specified
in these instructions are met. Secure the CVA
assembly to the wall with corrosion resistant sheet
metal screws through the mounting brackets.
Non-Concentric Vent
Connection Diameter Connection Diameter
Concentric Vent
Furnace
Size (MBH)
Exhaust Combustion Air Exhaust Combustion Air
6. Attach CVA Assembly to Unit
(inches)
(inches)
(inches)
(inches)
Attach the exhaust pipe to the unit’s combustion
exhaust. Using an additional combustion air pipe,
connect the unit’s combustion air supply intake to the
combustion air connection on the CVA.
4
6
4
6
4
6
6
8
75-175
200-400
Vent Length
7. Install Combustion Air Inlet Guard and
Exhaust Vent Terminal
Slide the combustion air inlet guard over the exhaust
pipe and fasten it to the combustion air pipe. Attach
the exhaust vent terminal to the discharge end of the
exhaust piping on the outside of the building.
Refer to table for minimum and maximum vent
lengths. The total equivalent vent length must include
elbows. The equivalent length of a 4 inch elbow is
6 feet and the
Vent
Minimum Maximum
equivalent length
of a 6 inch elbow
is 10 feet.
Length
(feet)
(feet)
10
70
Vertical
8. Seal Opening
Seal the opening between the wall and the air intake
pipe using an appropriate method.
1. Determine Venting Location
Determine the location of the concentric venting
adapter (CVA) based on any clearances that must
be maintained (follow all codes referenced in these
instructions).
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2. Attach Mounting Brackets
7. Install Combustion Air Inlet Guard and
Exhaust Vent Terminal
Slide the combustion air terminal over the vent pipe
and fasten it to the combustion air pipe. Attach the
exhaust vent terminal to the discharge end of the
exhaust piping.
Attach field-supplied, corrosion resistant, mounting
brackets to the CVA using corrosion resistant sheet
metal screws.
3. Install Exhaust Pipe
Slide the exhaust pipe through the CVA. Provide
enough exhaust piping to pass through the roof and
provide the minimum clearance of 12 inches between
the exhaust pipe termination and the combustion air
intake. With all required clearances satisfied, attach
the exhaust pipe to the CVA.
8. Seal Opening
Seal the opening between the roof line and the air
intake pipe using an appropriate method.
INTAKE END
Exhaust Connection
(Model IGX)
Exhaust Connection
(Model IG)
DISCHARGE
END
Combustion Air Connection
(Model IGX)
Combustion Air Connection
(Model IG)
4. Install Combustion Air Pipe
Attach a field-supplied combustion air pipe to the
concentric side of the CVA.
Be sure to provide enough combustion air piping
to pass through the roof and provide the minimum
clearance of 12 inches between the combustion
air intake and the exterior surface of the roof. This
clearance may need to be increased to allow for snow
accumulation.
Be sure to maintain the minimum clearance of
12 inches between the exhaust pipe termination and
the combustion air intake.
5. Install CVA Assembly
Place the CVA assembly through the roof and verify
that all minimum clearance requirements as specified
in these instructions are met. Secure the CVA
assembly to the ceiling with corrosion resistant sheet
metal screws through the mounting brackets.
6. Attach CVA Assembly to Unit
Attach the exhaust pipe to the unit’s combustion
exhaust. Using an additional combustion air pipe,
connect the unit’s combustion air supply intake to the
combustion air connection on the CVA.
Be sure to include the required tee’s with drip legs and
clean-outs.
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2. Install Combustion Air Pipe
Installation of Two Pipe Venting –
Horizontal
Refer to the diagram below for venting on horizontal
concentric systems. Maintain at least 12 inches of
clearance between the exhaust pipe termination and
the exterior surface of the exterior wall (Dim. A).
Run a combustion air pipe from the unit’s combustion
air intake through the exterior wall to the outdoors.
The combustion air pipe must terminate at least 12
inches from the combustion vent pipe and 24 inches
from the exterior surface of the outside wall. Attach
the combustion air inlet guard to the end of the
combustion air pipe. Using field-supplied mounting
brackets, support the combustion air pipe as needed.
The combustion air pipe must be a minimum of 12
inches from the exhaust pipe and 24 inches from the
exterior surface of the outside wall (Dim. B).
3. Seal Wall Openings
Using an appropriate method, seal the wall openings
around the piping.
A minimum of 1 inch and a maximum of 48 inches
of building wall thickness is required for separated
combustion vent pipe.
INTAKE END
A = 12 inch minimum
Exterior
Wall
B = 24 inch minimum
C = 12 inch minimum
Exhaust
Vent
Terminal
Exhaust Connection
(Model IGX)
Exhaust Connection
(Model IG)
B
A
EXHAUST
C
Pitch vent pipe
downward
COMBUSTION AIR
DISCHARGE
from furnace
¼ inch per foot
END
Two (2) field-supplied
support brackets
Combustion
Air Inlet
Terminal
Combustion Air Connection
(Model IGX)
Combustion Air Connection
(Model IG)
Vent Connection Diameter
Vent terminals must be used. The optional vent kit
includes two terminals. Construct the vent system as
shown in the drawings and refer to the table for the
correct vent connection diameters.
Furnace Size
(MBH)
Exhaust
(inches)
Combustion
(inches)
4
6
4
6
75 - 175
200 - 400
Vent Length
Refer to table for minimum and maximum vent
lengths. The minimum vent length is 5 feet and the
maximum vent length is 50 feet. The total equivalent
vent length must include elbows. The equivalent
length of a 4 inch elbow is 6 feet and the equivalent
length of a 6 inch elbow is 10 feet.
Vent
Minimum Maximum
Length
(feet)
(feet)
5
50
Horizontal
1. Install Exhaust Pipe
Run an exhaust pipe from the unit’s combustion
exhaust through the exterior wall to the outdoors. The
exhaust pipe must terminate at least 12 inches from
the outside surface of the outside wall. Attach exhaust
vent terminal to the end of the exhaust pipe. Using
field-supplied mounting brackets, support the exhaust
pipe as needed.
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1. Install Exhaust Pipe
Installation of Two Pipe Venting –
Vertical
Run an exhaust pipe from the unit’s combustion
exhaust through the roof to the outdoors. The exhaust
pipe must terminate at least 12 inches above the
outside surface of the roof. This clearance may need
to be increased to accommodate snow accumulation.
Attach the exhaust vent terminal to the end of the
exhaust pipe.
Refer to the diagram below for venting on vertical
concentric systems. The combustion air pipe must
terminate at least 12 inches above the roof. This
clearance may need to be increased to accommodate
for snow accumulation. The exhaust must terminate at
least 12 inches above and 12 inches horizontally from
the combustion air inlet.
2. Install Combustion Air Pipe
Run a combustion air pipe from the unit’s combustion
air intake through the roof to the outdoors. The
combustion air pipe must terminate at least 12 inches
horizontally and vertically from the combustion
exhaust pipe and at least 24 inches from the exterior
surface of the roof. These clearances may need to
be increased to accommodate for expected snow
accumulation. Attach the combustion air terminal to
the end of the combustion air pipe.
C
Exhaust Vent
Combustion
Terminal
Air Inlet
Terminal
B
A
Roof Line
3. Seal Roof Penetration
Using an appropriate method, seal the roof openings
around the vent pipes.
D
Tee with
drip leg and
clean-out cap
INTAKE END
D
A = 12 inch minimum, but should size
according to expected snow depth
Exhaust Connection
(Model IGX)
Exhaust Connection
(Model IG)
B = 24 inch minimum
C = 12 inch minimum
D = 12 inch minimum
DISCHARGE
Vent Connection Diameter
END
Vent terminals must be used. Construct the vent
system as shown in the drawings and refer to the
table for the correct vent connection diameters.
Furnace Size
(MBH)
Exhaust
(inches)
Combustion
(inches)
Combustion Air Connection
(Model IGX)
Combustion Air Connection
(Model IG)
4
6
4
6
75 - 175
200 - 400
Vent Length
Refer to table for minimum and maximum vent
lengths. The minimum vent length is 10 feet and the
maximum vent length is 70 feet. The total equivalent
vent length must include elbows. The equivalent
length of a 4 inch elbow is 6 feet and the equivalent
length of a 6 inch elbow is 10 feet.
Vent
Minimum Maximum
Length
(feet)
(feet)
10
70
Vertical
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1. Determine the Size of the Main Power
Lines
Installation - Electrical Wiring
The unit’s nameplate states the voltage and the unit’s
total MCA. The main power lines to the unit should be
sized accordingly. The nameplate is located on the
outside of the unit on the control panel side.
IMPORTANT
Before connecting power to the unit, read and
understand the following instructions and wiring
diagrams. Complete wiring diagrams are attached
on the inside of the control center door(s).
Voltage, Hertz, Phase
IMPORTANT
All wiring should be done in accordance with the
latest edition of the National Electrical Code ANSI/
NFPA 70 and any local codes that may apply. In
Canada, wiring should be done in accordance with
the Canadian Electrical Code.
VOLTS
HZ
EXH HP
MOP
PH
SUP HP
MCA
CAUTION
Unit’s Total MCA
If replacement wire is required, it must have a
temperature rating of at least 105ºC, except for
energy cut-off or sensor lead wire which must be
rated to 150ºC.
Electrical Nameplate
2. Provide the Opening(s) for the
IMPORTANT
Electrical Connections
Electrical openings vary by unit size and arrangement
and are field-supplied.
The equipment must be properly grounded. Any
wiring running through the unit in the airstream must
be protected by metal conduit, metal clad cable or
raceways.
3. Connect the Main Power
Connect the main power lines to the disconnect
switch and main grounding lug(s). Torque field
connections to 20 in.-lbs.
DANGER
High voltage electrical input is needed for this
equipment. This work should be performed by a
qualified electrician.
4. Wire the Optional Convenience Outlet
The convenience outlet requires a separate 115V
power supply circuit. The circuit must include short
circuit protection which may need to be supplied by
others.
CAUTION
Any wiring deviations may result in personal injury or
property damage. Manufacturer is not responsible
for any damage to, or failure of the unit caused by
incorrect final wiring.
5. Wire the Optional Accessories
Reference the ladder diagram on the inside of the
control center door for correct wiring of the following
accessories:
IMPORTANT
Manufacturer’s standard control voltage is 24 VAC.
Control wire resistance should not exceed 0.75 ohms
(approximately 285 feet total length for 14 gauge
wire; 455 feet total length for 12 gauge wire). If the
resistance exceeds 0.75 ohms, an industrial-style,
plug-in relay should be wired in place of the remote
switch. The relay must be rated for at least 5 amps
and have a 24 VAC coil. Failure to comply with these
guidelines may cause motor starters to chatter or
not pull in, resulting in contactor failures and/or
motor failures.
• Selectra Stat
• Room Override
• Blower Switch
• Heat Switch
• Dirty Filter Indicator
• TSCP
• KSCP
• Economizer Activator
• Room Stat
• Indicating Lights
NOTE
Wiring to the Selectra Stat or room override should
be in separate conduit or run with shielded cable.
NOTE
The TSCP and KSCP remote panels have number-
to-number wiring.
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6. Wire the Evaporative Cooler (optional)
Reference the ladder diagram on the inside of the
control center door for correct wiring of the pump and
the optional water valves.
NOTE
Large evaporative coolers may require a separate
power supply.
7. Install Economizer Sensors (optional)
All economizer options (EC) require an outdoor air
temperature or enthalpy sensor to be field installed
inside of the weatherhood and field wired to terminals
SO+ and SO- on the economizer.
Economizer options EC-3 and EC-4 require an outdoor
air temperature or enthalpy sensor to be field installed
in the return air duct and field wired to terminals SR+
and SR- on the economizer.
The sensors are provided by the factory and ship with
the unit.
8. Install Discharge Air Sensor (optional)
For units with 8:1, 16:1 or 24:1 staged turndown,
install the discharge air sensor at least three duct
diameters downstream of the heat exchanger. The
discharge air sensor can be found in the unit’s control
center.
9. Install DDC Interface (Optional)
Some units may use an external signal from a building
management system to control the dampers and/or
discharge air temperature. Reference the unit ladder
diagram for the correct wiring.
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1. Determine the Supply Gas
Installation of Gas Piping
Requirements
The unit’s nameplate states the requirements for the
gas being supplied to the unit.
IMPORTANT
All gas piping must be installed in accordance
with the latest edition of the National Fuel Gas
Code ANSI/Z223.1 and any local codes that may
apply. In Canada, the equipment shall be installed
in accordance with the Installation Code for Gas
Burning Appliances and Equipment (CGA B149)
and Provincial Regulations for the class. Authorities
having jurisdiction should be consulted before
installations are made.
Minimum gas pressure for maximum output
MAX BTU/HR
BTU/H MAX
MIN BTU/HR
BTU/H MIN
NORMAL MANIFOLD
PRESSURE
PRESSION DÕADMISSION
NORMALE
MIN GAS PRESSURE
FOR MAX OUTPUT
PRESSION DE GAZ MIN
POUR PUISSANCE MAX
“W.C.
“W.C.
“W.C.
MAX GAS
MIN GAS
PRESSURE
PRESSION DE GAZ
PRESSURE
PRESSION DE GAZ
MAX
“W.C.
PSI
IMPORTANT
DESIGN DT
DT NORMALE
TYPE OF GAS
NATURE DU GAZ
F
All piping should be clean and free of any foreign
material. Foreign material entering the gas train can
cause damage.
EQUIPPED FOR
CONCU POUR
AGAINST
EXTERNAL STATIC PRESSURE
SCFM
“W.C.
CONTE
PRESSION STATIQUE EXTERIEURE
WARNING
Type of gas
Maximum gas pressure
All components of this or any other gas fired heating
unit must be leak tested prior to placing the unit
into operation. A soap and water solution should be
used to perform this test. NEVER test for gas leaks
with an open flame.
Indirect Gas Nameplate
2. Install Additional Regulator if Required
When the supply gas pressure exceeds the maximum
gas pressure shown on the unit’s nameplate, an
additional regulator (by others) is required to reduce
IMPORTANT
the pressure. The
regulator must have a
listed leak limiting device
or it must be
vented to the
outdoors.
Do NOT connect the unit to gas types other than
what is specified and do NOT connect the unit to
gas pressures that are outside of the pressure range
shown on the label.
Supply Gas Pressure Range
(in. wg)
Minimum
Maximum
Natural
LP
6
14
14
10
WARNING
When leak testing pressures equal to or less than
14 in. wg (3.5 kPa), first close the field-installed
shutoff valve to isolate the unit from the gas supply
line.
3. Connect the Supply Gas Line
A manual shut off valve (gas cock), 1/8 inch plugged
test port and 6 inch drip leg must be installed prior
to the gas train. The valve and the test port must
be accessible for the connection of a test gauge.
NOTE
To
When connecting the gas supply, the length of the
run must be considered in determining the pipe size
to avoid excessive pressure drop. Refer to a Gas
Engineer’s Handbook for gas pipe capacities.
Supply gas
connections
must be
made by
a qualified
installer
Controls
Gas Cock
Ground Joint Union
From
Gas
Supply
NOTE
1/8 in. Plugged Tap
6 in. Trap
and are not
furnished by
Each furnace has a single 3/4-inch connection.
manufacturer.
Supply Gas Line
4. Test the System for Leaks
Check both the supply lines and the factory piping for
leaks. Apply a soap and water solution to all piping
and watch for bubbling which indicates a leak.
WARNING
NEVER test for a gas leak with an open flame.
WARNING
The factory piping has been checked for leaks, but
should be rechecked due to shipping and installation.
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Installation - Evaporative Cooler
Piping (optional)
Evaporative Cooling with Recirculating Pump
Evaporative Cooling with Auto Drain and Fill
Supply Line
Supply Line
Sump Overflow
VALVE A
Supply Solenoid
(normally closed)
Supply Line Valve
(normally closed)
Sump Drain
Drain Line Valve
(normally open)
VALVE C
Sump Drain Solenoid
(normally open)
Drain Line
Overflow
VALVE B
Trap
Trap
Supply Line Drain Solenoid
(normally open)
Drain Line
Recirculating Evaporative Piping
IMPORTANT
Auto Drain & Fill Evaporative Piping
IMPORTANT
The supply line should be of adequate size and
pressure to resupply the amount of water lost due to
bleed-off and evaporation. The drain line should be
the same size or larger than the supply line.
All supply solenoids, valves and all traps must be below
the roofline or be otherwise protected from freezing.
IMPORTANT
The supply line should be of adequate size and
pressure to resupply the amount of water lost due to
bleed-off and evaporation. The drain line should be
the same size or larger than the supply line.
CAUTION
All solenoid valves and traps must be installed
below the roof to protect the supply water line from
freezing. If they cannot be installed below the roof,
an alternative method must be used to protect the
lines from freezing.
CAUTION
Provisions must be taken to prevent damage to the
evaporative cooling section during freezing conditions.
The sump, drain lines and supply lines must be
drained prior to freezing conditions or an alternate
method must be used to protect the lines and media.
IMPORTANT
The supply solenoid (Valve A) is NOT the same as
the drain solenoids (Valve B and Valve C). Make sure
to use the proper solenoid for each location. Check
your local code requirements for proper installation
of this type of system.
1. Install the Water Supply Line
Supply line opening requirements vary by unit size
and arrangement and are field-supplied. Connect the
water supply line to the float valve through the supply
line opening in the evaporative cooling unit. Install a
manual shutoff valve in the supply line.
Auto Drain & Flush Valves
(when provided by manufacturer)
Mfg.
Part
ASCO™
Part
Assembly
Number
Solenoid De-Energized
2. Install the Drain Line
Diameter Qty.
Type
Position
Connect an unobstructed drain line to the drain and
overflow connections on the evaporative cooler. A
manual shut off valve (by others) is required for the
evaporative cooler
Number Number
1/2 inch
1
461262 8210G2
Supply
Closed
(12.7 mm)
Supply
Line
Drain
drain line. A trap
1/4 inch
1
852178 461263 8262G262
461264 8210G35
Open
Open
should be used to
6 in. min.
(6.35 mm)
prevent sewer gas
from being drawn
into the unit.
Drain
Trap
6 in. min.
Sump
Drain
3/4 inch
1
(19.05 mm)
Part numbers subject to change.
3. Check/Adjust Water Level
Check the water level in the sump tank. The water
level should be above the pump intake and below the
overflow. Adjust the float as needed to achieve the
proper water level.
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TM
1. Install the Water Supply Line
Supply line opening requirements vary by unit size
and arrangement and are field-supplied. Connect the
water supply line to the float valve through the supply
line opening in the evaporative cooling unit. Install
the 1/2 inch normally closed solenoid (Valve A) in the
supply line. Install the 1/4 inch normally open solenoid
(Valve B) between the supply line and the drain line as
shown.
Installation of Water Wizard (optional)
Evaporative Cooling with the Water Wizard™
NOTE
The following instructions are provided for
evaporative coolers equipped with the Water
Wizard™ only. Additional instructions are provided
for evaporative coolers equipped with the auto drain
and fill or bleed-off.
2. Install the Drain Line
WARNING
Connect an unobstructed drain line to the sump drain
overflow connection. Install the 3/4 in. normally open
solenoid (Valve C) between the sump drain connection
and the drain line. A
Disconnect and lock-out all power and gas before
performing any maintenance or service to the unit.
Failure to do so could result in serious injury or
death and damage to equipment.
trap should be used to
prevent sewer gas from
being drawn into the
unit. Refer to Drain Trap
drawing.
6 in. min.
Drain
Trap
Water Wizard™ Valves
6 in. min.
(when provided by manufacturer)
Mfg.
Part
ASCO™
Part
Unit
Model
Assembly
Number
Solenoid De-Energized
3. Check/Adjust Water Level
Check the water level in the sump tank. The water
Diameter Qty.
Type
Position
Number Number
level should be above the pump intake and below the
overflow. Adjust the float as needed to achieve the
proper water level.
1/2 inch
1
461262 8210G2 Supply
Supply
Closed
IGX -
(12.7 mm)
H12/H22
852370
852371
IGX - H32
(<9000 cfm)
1/2 inch
1
383086 8210G34
Line
Open
Closed
Open
(12.7 mm)
Drain
3/4 inch
1
383088 8210G9 Supply
(19.05 mm)
IGX - H32
(≥9000 cfm)
Supply
1/2 inch
1
383086 8210G34
Line
(12.7 mm)
Drain
Part numbers subject to change.
1. Install Normally Closed Supply Line/
Solenoid
Connect the water supply line to the manual supply
valve in the unit. Install the supply solenoid in the
supply line, upstream of the manual supply valve and
below the roofline.
2. Install Normally Open Drain Line/
Solenoid
Connect the drain line to the supply line between the
manual supply valve and the supply solenoid. Install a
drain solenoid in the drain line, below the roof line. A
trap should be installed in the drain line.
NOTE
Solenoid(s) may be provided by manufacturer (if
ordered) or by others.
CAUTION
Any wiring deviations may result in personal injury or
property damage. Manufacturer is not responsible
for any damage to or failure of the unit caused by
incorrect final wiring.
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Installation of Water Wizard™,
continued
Installation - Direct Expansion (DX)
Coil Piping (optional)
To Media
IMPORTANT
Pressure Gauge
Factory
Installed
Guidelines for the installation of direct expansion
cooling coils have been provided to ensure proper
performance and longevity of the coils. These are
general guidelines that may have to be tailored
to meet the specific requirements of any one job.
As always, a qualified party or individual should
perform the installation and maintenance of any coil.
Protective equipment such as safety glasses, steel
toe boots and gloves are recommended during the
installation and maintenance of the coil.
Sump Drain
Manual Supply Valve
Roof Line
Supply Solenoid
(normally closed)
Field
Installed
Supply Line Drain Solenoid
IMPORTANT
Trap
(normally open)
All field-brazing and welding should be performed
using high quality materials and an inert gas purge
(such as nitrogen) to reduce oxidation of the internal
surface of the coil.
Water Wizard™ Installation
3. Wire the Solenoid(s)
Wire the supply line solenoid and drain solenoid as
shown on the unit’s wiring diagram in the control
center.
IMPORTANT
All field-piping must be self-supporting and flexible
enough to allow for the thermal expansion of the coil.
4. Wire the Temperature Sensor
If the evaporative cooler shipped separate from the
unit, the temperature sensor must be wired. The
sensor wire is bundled inside the discharge end of the
evaporative cooler. Wire the sensor wire to terminals
AI2 and AIC on the terminal strip in the unit’s control
center.
1. Locate the Distributor(s) by Removing
the Distributor Access Panel
NOTE
The Water Wizard™ start-up must be completed for
proper performance.
Distributor Access Panel
Thermal
(by others)
(by others)
Installation with Hot Gas Bypass
2. Verify Nozzle Placement
Inspect the refrigerant
distributor and verify
that the nozzle is in
place. The nozzle is
generally held in place
by a retaining ring or is
an integral part of
Retainer
Ring
Nozzle
Distributor
Nozzle Placement
the distributor itself.
Model IG / IGX Make-Up Air
20
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for one minute, the system is ready to be charged or
refrigerant in another portion of the system can be
opened to the coil. A steady rise in microns would
indicate that moisture is still present and that the coil
should be further vacuumed until the moisture has
been removed.
NOTE
If a hot gas bypass kit was provided by others, refer
to the manufacturer’s instructions.
3. Install Suction Line
Install suction line(s) from the compressor to the
suction connection(s) which are stubbed through the
side of the cabinet.
NOTE
Failure to obtain a high vacuum indicates a great
deal of moisture or a small leak. Break the vacuum
with a charge of dry nitrogen or other suitable
gas and recheck for leaks. If no leaks are found,
continue vacuuming the coil until the desired
vacuum is reached.
4. Install the Liquid Line and Thermal
Expansion Valve (TEV) (By Others)
Liquid line openings vary by coil size and
circuiting and are field-supplied. Follow the TEV
recommendations for installation to avoid damaging
the valve. If the valve is externally equalized, use
a tubing cutter to cut off the plugged end of the
factory-installed equalizer line. Use a de-burring tool
to remove any loose metal from the equalizer line and
attach it to the TEV. If the valve is internally equalized,
the factory-installed equalizer line can be left as is.
8. Install the Drain Line
Connect an
unobstructed drain
line to the drain pan. A
6 in. min.
trap should be used to
prevent sewer gas from
being drawn into the
unit.
Drain
Trap
6 in. min.
Coil
Suction Header
Distributor
Equalizer Line
Liquid Line
Nozzle
IMPORTANT
All traps must be installed below the roof line or be
otherwise protected from freezing.
Thermal
Expansion
Valve (by others)
Suction Line
Remote Sensing Bulb
Straps
Suction Connection
General Installation
5. Mount the Remote Sensing Bulb
(By Others)
The expansion valve’s remote sensing bulb should be
securely strapped to the horizontal run of the suction
line at the 3 or 9 o’clock position and insulated.
6. Check Coil Piping for Leaks
Pressurize the coil to 100 psig with dry nitrogen or
other suitable gas. The coil should be left pressurized
for a minimum of 10 minutes. If the coil holds the
pressure, the hook-up can be considered leak free.
If the pressure drops by 5 psig or less, re-pressurize
the coil and wait another 10 minutes. If the pressure
drops again, there is likely one or more small leaks
which should be located and repaired. Pressure losses
greater than 5 psig indicate a large leak that should be
isolated and repaired.
7. Evacuate and Charge the Coil
Use a vacuum pump to evacuate the coil and any
interconnecting piping that has been open to the
atmosphere. Measure the vacuum in the piping using
a micron gauge located as far from the pump as
possible. Evacuate the coil to 500 microns or less
and then close the valve between the pump and the
system. If the vacuum holds to 500 microns or less
Model IG / IGX Make-Up Air
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Installation of Chilled Water Coil
Piping (optional)
Installation of Building Pressure
Control (optional)
1. Mount Pressure Tap
Using the factory provided bracket, mount the
pressure tap to the
outside of the unit.
Choose a location
out of the prevailing
winds and away from
supply or exhaust
fans to assure
accurate readings.
IMPORTANT
Guidelines for the installation of the cooling coil
have been provided to ensure proper performance
of the coils and their longevity. These are general
guidelines that may have to be tailored to meet the
specific requirements of any one job. As always,
a qualified party or individual should perform the
installation and maintenance of the coil. Protective
equipment such as safety glasses, steel toe boots
and gloves are recommended during the installation
and maintenance of the coil.
2. Run Pressure Tap Lines
Run a pressure tap line from the pressure tap on the
outside of the unit to the low pressure tap on the back
of the photohelic gauge. Run a second pressure tap
line from the high pressure tap on the back of the
photohelic gauge to the space. Fifty feet of tubing is
supplied with the unit.
When installing couplings, do not apply undue
stress to the connection. Use a backup pipe
wrench to avoid breaking the weld between the coil
connection and the header.
All field-piping must be self-supporting. System
piping should be flexible enough to allow for the
thermal expansion and contraction of the coil.
1. Verify Coil Hand Designation
High
Pressure
Tap to
Factory
Wiring
Check the coil hand
Hot Return
designation to ensure that
Connection
space
it matches the system.
Coils are generally
plumbed with the supply
connection located on
the bottom of the leaving
air-side of the coil and the
Entering
Air
Leaving
Air
Low
Pressure
Tap to
outside
Cold Supply
Connection
Connections for Photohelic Gauge
return connection at the top of the entering air-side
of the coil. This arrangement provides a counter flow
heat exchanger and positive coil drainage.
3. Set the Building Pressure
The pressure gauge is used to set the desired building
pressure. The pressure is set by adjusting the knobs
for the upper and lower pressure limits. Typical
settings are 0.0 in. wg for the lower and 0.10 in. wg for
the upper pressure setting.
2. Check the Coil for Leaks
Pressurize the coil to 100 psig with dry nitrogen or
other suitable gas. The coil should be left pressurized
for a minimum of 10 minutes. If the coil holds the
pressure, the hook-up can be considered leak free.
If the pressure drops by 5 psig or less, re-pressurize
the coil and wait another 10 minutes. If the pressure
drops again, there is likely one or more small leaks
which should be located and repaired. Pressure losses
greater than 5 psig indicate a large leak that should be
isolated and repaired.
Pressure Indicating
Needle
Pressure Setting
Needles
3. Connect the Supply & Return Lines
Connect the supply and return lines as shown above.
Pressure Setting Knobs
4. Install the Drain Line
Connect an unobstructed
drain line to the drain pan.
Typical Photohelic Gauge Settings
6 in. min.
A trap should be installed
Drain
Trap
to prevent sewer gas from
being drawn into the unit.
6 in. min.
IMPORTANT
All traps must be installed below the roof line or be
otherwise protected from freezing.
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22
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Start-Up - Blower
NOTE
Refer to the Start-Up Checklist in the Reference
Section Before Proceeding Further!
Pre Start-Up Check
Rotate the fan wheel by hand and make sure no
parts are rubbing. Check the V-belt drive for proper
alignment and tension (a guide for proper belt tension
and alignment is provided in the Belt Maintenance
section). Check fasteners, set screws, and locking
collars on the fan, bearings, drive, motor base, and
accessories for tightness.
To reverse the rotation on three phase units,
disconnect and lock-out the power, then
interchange any two power leads.
NOTE
To reverse the rotation on single phase units,
disconnect and lock-out the power, then rewire the
motor per the manufacturer’s instructions.
IMPORTANT
If the blower is rotating in the wrong direction, the
unit will move some air, but will not perform as
designed. Be sure to perform a visual inspection to
guarantee the correct blower rotation.
WARNING
Disconnect and lock-out all power and gas before
performing any maintenance or service to the unit.
Failure to do so could result in serious injury or
death and damage to equipment.
3. Check for Vibration
Check for unusual noise, vibration or overheating of
the bearings. Reference the Troubleshooting section
for corrective actions.
SPECIAL TOOLS REQUIRED
• Voltage Meter (with wire probes)
• Amperage Meter
IMPORTANT
• Micro Amp Meter
• Pressure Gauges – (refrigerant)
• Tachometer
Excessive vibration may be experienced during
the initial start-up. Left unchecked, it can cause a
multitude of problems including structural and/or
component failure.
• Thermometer
• Incline manometer or equivalent
IMPORTANT
Generally, fan vibration and noise is transmitted
to other parts of the building by the ductwork. To
minimize this undesirable effect, the use of heavy
canvas duct connectors is recommended.
WARNING
Check the housing, blower, and ductwork for any
foreign objects before running the blower.
1. Check the Voltage
4. Motor Check
Before starting the unit, compare the supplied voltage,
hertz, and phase with the unit and motor’s nameplate
Measure the motor’s voltage, amps and RPM.
Compare to the specifications. Motor amps can be
reduced by lowering the motor RPM or increasing
system static pressure.
information.
Voltage, Hertz, Phase
VOLTS
HZ
PH
IMPORTANT
SUP HP
MCA
Additional starters and overloads may be provided
in the make-up air control center for optional
exhaust blowers. Any additional overloads must be
checked for proper voltage, amps and RPMs.
MOP
Unit’s Total MCA
Electrical Nameplate
2. Check the Blower Rotation
Open the blower access
door and run the blower
momentarily to determine the
rotation.
5. Air Volume Measurement & Check
Measure the unit’s air volume (CFM) and compare it
with its rated air volume. If the measured air volume
is off, adjust the fan’s RPM by changing/adjusting the
drive.
Arrows are placed on the
blower scroll to indicate the
proper direction or reference
Blower
Housing
Blower Rotation
the example shown.
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23
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NOTE
The most accurate way to measure the air volume is
by using a pitot traverse method downstream of the
blower. Other methods can be used but should be
proven and accurate.
IMPORTANT
Changing the air volume can significantly increase
the motor’s amps. If the air volume is changed,
the motor’s amps must be checked to prevent
overloading the motor.
NOTE
To ensure accuracy, the dampers are to be open
when measuring the air volume.
6. Set-up Optional Components
Adjust the settings on the optional components. See
the Control Center Layout in the Reference section for
location of optional components.
• Heating Inlet Air Sensor
Typical setting: 60-70ºF
• Cooling Inlet Air Sensor
Typical setting: 75ºF
• Building Freeze Protection
Typical setting: 5 minutes; 45ºF
• Dirty Filter Gauge
Typical setting: Settings vary greatly for each
unit. See Reference section for adjusting
information.
NOTE
If your unit is equipped with a 4:1 modulation or
8:1 staged control, the inlet air sensor and building
freeze protection may be included in the furnace
controller. If this is the case, instructions for setting
the inlet air sensor and building freeze protection are
included in the Furnace Start-Up.
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24
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Start-Up - Furnaces (all units)
Available Control Options
Single Furnace Units
IMPORTANT
1:1 Staged
2:1 Staged
8:1 Staged
one 1-stage furnace
one 2-stage furnace
one 8-stage furnace
For the unit to function properly, all stage or
modulation valves must be set for high and low fire.
2:1 Electronic
Modulation
NOTE
one 2:1 modulating furnace
one 4:1 modulating furnace
There are five furnace control options available. Be
sure to refer to the specific instructions for your
control type.
4:1 Electronic
Modulation
Two Furnace Units
IMPORTANT
1:1 Staged
2:1 Staged
4:1 Staged
two independent 1-stage furnaces
two independent 1-stage furnaces
two independent 2-stage furnaces
Multi furnace units may use a combination of the
available control options. Each furnace must be set-
up per the specific instructions for its control type.
one 8-stage and
one 1-stage furnace
16:1 Staged
IMPORTANT
8:1 Electronic
Modulation
one 4:1 modulating and
one 2-stage furnace
Multi furnace units will use one stage or electronic
modulation controller per unit and one or two
ignition controller(s) per furnace. Each furnace will
have its own gas valve(s). Each valve must be set for
high and low fire.
Three Furnace Units
1:1 Staged
3:1 Staged
6:1 Staged
three independent 1-stage furnaces
three independent 1-stage furnaces
three independent 2-stage furnaces
NOTE
one 8-stage and
two 1-stage furnaces
24:1 Staged
To force the unit to light for set-up purposes, the
heat switch must be closed or jumpered out. See
the Ladder Diagram on the inside of the control
center door for proper terminals to jumper out.
one 4:1 modulating,
one 2-stage and
one 1-stage furnace
12:1 Electronic
Modulation
NOTE
Start-Up - Single Stage Control
If the unit is equipped with an independent
1. Send Unit to High Fire
Send the unit to high fire by
inlet air sensor (not incorporated into the stage
or modulation controller), the unit will not light
unless the outside air temperature is less than
the inlet air sensor setting. If the outside air is
greater than the inlet air sensor setting, turn the
setting to its maximum position. When set-up is
complete, reset the inlet air sensor to the proper
temperature. If the unit is equipped with a stage or
electronic modulation controller that includes an
inlet air sensor function, the inlet air sensor will be
overridden when the unit is forced to high fire.
setting the temperature selector to
its maximum setting.
Temperature
Selector
2. Check the High Fire Manifold
Pressure
Using a manometer, measure the burner manifold
pressure at the manifold pressure test port. Refer to
the Gas Train Layout in the Reference section for the
test port location.
The pressure on high fire
Single Stage Manifold
should be 3-1/2 in. wg for
Pressure (in. wg)
natural gas and
10 in. wg for
LP gas.
LP
10
Natural Gas
3-1/2
High Fire
If needed, use the
high fire adjustment
High Fire
Adjustment
screw on the staged gas
valve to adjust the high
fire manifold pressure.
Counterclockwise rotation
will decrease the gas
pressure and clockwise
rotation will increase the
gas pressure.
3. Reset the Temperature Setting
Reset the temperature setting on the temperature
selector to the desired setting.
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25
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Start-Up - 2:1 Staged Control
Start-Up - 8:1 Staged Control
1. Send Unit to High Fire
Send the unit to high fire by setting
the temperature selector to its
IMPORTANT
8:1 staged furnaces use two manifolds and two
staged gas valves per furnace. The high and low fire
manifold pressure must be checked and properly
set on each manifold.
Temperature
maximum setting.
Selector
2. Check the High Fire
Manifold Pressure
IMPORTANT
Using a manometer, measure the burner manifold
pressure at the manifold pressure test port. Refer to
the Gas Train Layout in the Reference section for the
test port location.
Confirm that the discharge air sensor is installed in
the duct, at least three duct diameters downstream
of the furnace.
The pressure on high fire should be 3-1/2 in. wg for
natural gas and 10 in. wg for LP gas.
1. Send the Unit to High Fire
For the furnace to light, the heat switch must be
closed or jumpered out. Reference the unit ladder
diagram for proper terminals to jumper.
If needed, use the high fire adjustment screw on the
combination gas valve to adjust the high fire manifold
pressure. Counterclockwise rotation will decrease the
gas pressure and clockwise rotation will increase the
gas pressure.
To send the unit to high fire, press and hold the Up,
Down and Enter keys. The middle LED light, L2, will
flash on the screen when the unit is forced to high fire.
High Fire
Adjustment
High Fire
Terminal
Low Fire
Adjustment
The unit will remain at high fire until the Function key
is pressed (middle LED light, L2, will stop flashing).
L1
L2
L3
Function
Enter
Up
Down
WARNING
Once the unit is forced to high fire, it will remain at
high fire until the Function key is pressed.
3. Send Unit to Low Fire
Remove and isolate the wire from the high fire terminal
on the combination gas valve to send the unit to low
fire.
NOTE
Forcing the unit to high fire during warm or hot
weather conditions may cause the high limit switch
to trip. If the switch trips, it will reset once the
discharge air temperature has reached a safe level.
4. Check the Low Fire Manifold Pressure
Using a manometer, measure the burner manifold
pressure at the manifold pressure test port. Refer to
the Gas Train Layout in the Reference section for the
2. Check the High Fire Manifold
Pressure
Using a manometer, measure the high fire burner
manifold pressure for each furnace at the pressure
test port. Refer to the Gas Train Layout in the
Reference section for the test port location.
test port location.
Two Stage Manifold
Pressure (in. wg)
The pressure on low fire
should be 7/8 in. wg
for natural gas and
2-1/2 in. wg for LP
gas.
LP
2-1/2
10
Natural Gas
7/8
Low Fire
High Fire
3-1/2
The recommended high fire manifold pressure is
3-1/2 in. wg for natural gas and 10 in. wg for LP gas.
If needed use the low fire adjustment screw on the
combination gas valve to adjust the low fire manifold
pressure. Counterclockwise rotation will decrease the
gas pressure and clockwise rotation will increase the
gas pressure. Once the low fire manifold pressure is
set, reattach the high fire wire to the high fire terminal.
If needed, adjust the high fire screws on each staged
gas valve to set both high fire manifold pressures.
Counterclockwise rotation will decrease the gas
pressure and clockwise rotation will increase the gas
pressure.
5. Reset the Temperature Setting
Reset the temperature setting on the temperature
selector to the desired setting.
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6. Access the Discharge Air
High Fire
Adjustment
High Fire
Terminal
Low Fire
Adjustment
Temperature Setting
Using the Up or Down key, scroll through the
Setpoints Menu until the
display reads “dtS”, then
press the Enter key. The
display will change to the
discharge air temperature
setting.
7. Edit the Setting
Use the Up or Down key to change the discharge
air temperature setting. When the correct setting is
displayed, press the Enter key to save the setting and
return to the Setpoints Menu.
3. Send the Unit to Low Fire
Disconnect and isolate the wire from the high fire
terminal to send the unit to low fire.
NOTE
Steps 8 - 9 are provided for adjusting the inlet air
set point. The inlet air sensor is preset to the factory
recommended 65ºF, only adjust if needed.
4. Check the Low Fire Manifold Pressure
Measure each valve’s low fire manifold pressure.
The recommended low fire manifold pressure is 7/8 in.
wg for natural gas and 2-1/2 in. wg for LP.
NOTE
The inlet air sensor monitors the temperature of
the inlet air. If the inlet air is above the sensor’s set
point, the inlet air sensor shuts off the furnace and
continues to supply the warm outside air.
If needed, use the low fire adjustment screw on each
staged gas valve to properly set both low manifold
settings. Counterclockwise rotation will decrease the
gas pressure and clockwise rotation will increase the
gas pressure.
8. Access the Inlet Air Sensor Setting
From the Setpoints Menu, use the Up or Down key to
navigate through the menu options until the display
reads “iAS”. Once the
display reads “iAS”, press
the Enter key. The display
When the low fire manifold pressure is properly set,
reattach the disconnected
wire to the high fire
Pressure (in. wg)
Eight Stage Manifold
terminal, allow the heat
Natural Gas
7/8
LP
2-1/2
10
switch to close
or remove the
jumper.
Low Fire
High Fire
will change to the inlet air
sensor setting.
3-1/2
9. Edit the Setting
WARNING
Use the Up or Down key to change the inlet air setting.
When the correct setting is displayed, press the Enter
key to save the setting and return to the Setpoints
Menu.
Once the high and low fire have been set, be sure
the press the Function key to end high fire mode.
The middle LED light, L2, will stop flashing when
high fire mode is off.
NOTE
NOTE
After modifying a setting, the Enter key must be
pressed to save the change. If the Enter key is not
pressed, the display will return to the Setpoints
Menu without saving the change.
Step 5-7 are for adjusting the discharge air setting.
The discharge air temperature setting is factory set
to the recommended 70ºF. Only adjust the setting if
needed.
NOTE
NOTE
Steps 10 - 11 are provided for adjusting the room
override setting. Only adjust the setting if the room
override function is desired.
After modifying a setting, the Enter key must be
pressed to save the change. If the Enter key is not
pressed the display will return to the setpoints menu
without saving the change.
NOTE
The room override function temporarily changes
the discharge air temperature to the room override
setting if the room thermostat is not satisfied.
5. Access the Setpoints Menu
Press and hold the Function
key for three seconds to
access the Setpoints Menu.
The display will read “SEt.”
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10. Access the Room Override Setting
From the Setpoints Menu, use the Up or Down key to
navigate through the menu
options until the display
reads “rot.” Once the display
reads “rot,” press the Enter
key. The display will change
to the room override setting.
NOTE
The room override function requires a field-supplied
thermostat to be installed in the space and to be
wired between terminal 31 and 32 in the unit’s
control center. Reference the unit ladder diagram.
11. Edit the Setting
Use the Up or Down key to change the room override
setting. When the correct setting is displayed, press
the Enter key to save the setting and return to the
Setpoints Menu.
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Start-Up - 2:1 Electronic Modulation
NOTE
The low fire manifold pressure should always be
rechecked after adjusting the high fire.
1. Send Unit to High Fire
Turn the temperature
Temperature
Selector
selector to its maximum
NOTE
setting to send the unit
to high fire.
Once the high and low fire manifold pressures are
properly set, reset the discharge air temperature to
the desired setting.
2. Check the High Fire Manifold
Pressure
With the unit at high fire, use a manometer to measure
the burner manifold pressure at the manifold pressure
test port. See the Gas Train Layout in the Reference
section for the manifold pressure test port location.
The recommended high fire manifold pressure is
3-1/2 in. wg for natural gas and 10 in. wg for
LP gas.
If needed, use the high
fire adjustment screw on
High Fire
Adjustment
the shut-off gas valve to
adjust the high fire manifold
pressure. Counterclockwise
rotation will decrease the
gas pressure and clockwise
rotation will increase the gas
pressure.
3. Send Unit to Low Fire
Remove and isolate one wire from the modulating gas
valve terminal to send the unit to low fire.
4. Check the Low Fire Manifold Pressure
With the unit at low fire, use a manometer to measure
the burner manifold pressure at the manifold pressure
test port. See the Gas Train Layout in the Reference
section for the manifold pressure test port location.
The recommended low
fire manifold pressure is
7/8 in. wg for
2:1 Manifold Pressure
(in. wg)
Natural Gas
7/8
LP
2-1/2
10
natural gas and
Low Fire
High Fire
2-1/2 in. wg
for LP gas.
3-1/2
If needed, use the low fire adjustment screw on the
modulating gas valve to adjust the low fire manifold
pressure. Counterclockwise
Terminal
rotation will decrease the
gas pressure and clockwise
rotation will increase the gas
pressure.
Once the low fire is set,
reattach the disconnected
wire to the modulating valve
Low Fire
and reset the temperature
Adjustment
selector.
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To enter the high fire
setting mode, press
and hold button #1
until the LED lights
solid red. Release.
The valve is now in
the high fire setting
mode.
Start-Up - 4:1 Electronic Modulation
#1
#2
1. Send the Unit to High Fire
To send the unit to high fire, press and hold the Up,
Down and Enter keys. The unit will remain at high fire
until the Function key is pressed.
LED
Light
Press or hold button
#2 to decrease gas
Function
Enter
Up
flow. Each button press equates to the minimum
available step size and will decrease flow slowly.
Holding the button down auto-steps and eliminates
the need to continuously press the button. Use this
feature to rapidly decrease the flow.
Down
WARNING
Press or hold button #1 to increase gas flow. Each
button press equates to the minimum available
step size and will increase flow slowly. Holding the
button down auto-steps and eliminates the need to
continuously press the button. Use this feature to
rapidly decrease the flow.
If the unit is forced to high fire, it will remain at high
fire until the Function key is pressed.
NOTE
After modifying a setting, the Enter key must be
pressed to save the change. If the Enter key is not
pressed the display will return to the Program Menu
without saving the change.
High fire setting should be 3.5 in. wg for natural gas
and 10.0 in. wg for LP gas.
To save high fire setting, simultaneously hold button
#1 and #2 until the LED turns off.
NOTE
Forcing the unit to high fire in mild weather
conditions may cause the high limit switch to trip. If
the switch trips, it will reset once the discharge air
temperature is at a safe level.
NOTE
Controls left in the high fire setting mode will default
to the current setting after 5 minutes of inactivity.
3. Exit High Fire Mode
2. Check the High Fire Manifold
Press the Function key to exit high fire mode.
Pressure
Before setting high fire on the EXA valve, turn the
regulator screw on the combination valve all the way
in (increase pressure).
4. Send Unit to Low Fire
Remove the cover on the modulating gas valve. Press
and hold button #2 until the LED light blinks red;
release. The unit is now in low fire.
Using a manometer, measure the high fire manifold
pressure at the pressure test port. Refer to the Gas
Train Layout in the Reference section for the test port
location.
5. Check the Low Fire Manifold
Pressures
With the unit at low fire, use a manometer to check the
manifold pressure. Refer to the Gas Train Layout in the
Reference section for the test port location.
The recommended high fire manifold pressure is
3-1/2 in. wg for natural gas and 10 in. wg for LP gas.
If needed, adjust the high
fire screw on the shut-
off valve to set the high
fire manifold pressure.
Counterclockwise rotation
will decrease the gas
pressure and clockwise
rotation will increase the
gas pressure.
The recommended low
fire manifold pressure
is 1/3 in. wg for natural
gas and 1.0 in.
4:1 Modulation Manifold
Pressure (in. wg)
High Fire
Adjustment
Natural Gas
1/3
LP
1
Low Fire
High Fire
wg for LP gas.
3-1/2
10
To adjust the
low fire gas pressure, use button #1 and #2 on the
gas valve. Button #1 will increase the gas pressure,
while button #2 will decrease the gas pressure. Each
time the button is pressed, it corresponds to the
minimum available step size and will slowly change
the gas pressure. Holding the button down will rapidly
change the gas pressure. To save the low fire setting,
stimutaneously hold buttons 1 and 2 until the LED
turns off.
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10. Edit the Setting
Note: If the valve remains in the low fire setting mode
for more than five (5) minutes, it will revert back to its
previous setting.
Use the Up or Down key to edit the inlet air setting.
When the correct setting is displayed, press the Enter
key to save the setting and return to the Setpoints
menu.
NOTE
The following steps are for adjusting the discharge
air setting. The discharge air temperature setting is
factory set to the recommended 70ºF. Only adjust
the setting if needed.
NOTE
Steps 11 and 12 are provided for adjusting the room
override setting. Only adjust the setting if the room
override function is desired.
6. Access the Setpoints Menu
Press and hold the Function
key for three seconds to
access the Setpoints Menu.
The display will read “SEt”
when Setpoints Mode is
active.
NOTE
The room override function temporarily changes
the discharge air temperature to the room override
setting if a room thermostat is not satisfied.
11. Access the Room Override Setting
From the Setpoints Menu, use the Up or Down key to
navigate through the menu
7. Access the Discharge Air
Temperature Setting
options until the display
Use the Up or Down keys to
scroll through the Setpoints
Menu options until the
reads “rot.” Once the display
reads “rot,” press the Enter
key. The display will change
to the room override setting.
display reads “dtS” then
press the Enter key. The display will change to the
discharge air temperature setting.
NOTE
The room override function requires a field-supplied
thermostat to be installed in the space and to be
wired between terminal 31 and 32 in the unit’s
control center.
8. Edit the Setting
Use the Up or Down keys to change the discharge
air temperature setting. When the correct setting is
displayed, press the Enter key to save the setting and
return to the Setpoints Menu.
12. Edit the Setting
Use the Up or Down key to change the room override
setting. When the correct setting is displayed, press
the Enter key to save the setting and return to the
Setpoints menu.
NOTE
After modifying a setting, the Enter key must be
pressed to save the change. If the Enter key is not
pressed the display will return to the Setpoints
Menu without saving the change.
NOTE
After modifying a setting, the Enter key must be
pressed to save the change. If the Enter key is not
pressed the display will return to the Setpoints
Menu without saving the change.
NOTE
Steps 9 thru 10 are provided for adjusting the inlet
air set point. The inlet air sensor is preset to the
factory recommended 60ºF, only adjust if needed.
NOTE
The inlet air sensor monitors the temperature of
the inlet air. If the inlet air is above the sensor’s set
point, the inlet air sensor shuts off the furnace and
continues to supply the warm outside air.
9. Access the Inlet Air Sensor Setting
From the Setpoints Menu, use the Up or Down key to
navigate through the menu options until the display
reads “iAS.” Once the display
reads “iAS”, press the Enter
key. The display will change
to the inlet air sensor setting.
Model IG / IGX Make-Up Air
31
®
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Start-Up - Economizer (optional)
IMPORTANT
The outside air volume must be measured and
compared to the total air volume when setting
the minimum outside air. The minimum outside air
should never be set based on the inlet damper or
potentiometer position.
NOTE
To prevent premature heat exchanger failure, do not
locate units where chlorinated, halogenated, or acid
vapors are present.
NOTE
3. Set the Enthalpy Changeover Set
Point (optional)
Units with an economizer are designed for either
0-30% outside air (HV-1), 31-75% outside air
(HV-2) or 100% return air (HV-3). Refer to the CAPS
submittal for the unit’s ventilation type.
If using an economizer, the enthalpy changeover
setting must be set. If differential temperature or
differential enthalpy control is used, set the enthalpy
changeover set point to D. If outside air temperature
or enthalpy reference is used, set the enthalpy
changeover set point to the desired setting from the
following table.
NOTE
HV-1 and HV-2 use economizer controls (EC) or
(MB).
NOTE
Enthalpy Changeover Setting
Economizer control may use outside air temperature
reference (EC-1), outside enthalpy reference
(EC-2), differential temperature reference (EC-3) or
differential temperature reference (EC-4).
Changeover
Setting
Temperature* (°F)
A
B
C
D
73
70
67
63
NOTE
Economizer control may use a potentiometer
(MB-1), 2-10 VDC signal (MB-2), 4-20mA signal
(MB-3) or a manual quadrant (MB-4).
*Temperature at 50% relative humidity, see the
Honeywell W7212 Economizer instructions for set
points at other humidities
1. Verify Sensor Installation
All economizer options (EC) require an outdoor air
temperature or enthalpy sensor to be field-installed
inside of the weatherhood and field-wired to terminals
SO+ and SO- on the economizer.
NOTE
For options EC-3 and EC-4 the enthalpy changeover set
point is the temperature at which the economizer will
send the dampers to the minimum outside air position.
Economizer options EC-3 and EC-4 require an outdoor
air temperature or enthalpy sensor to be field-installed
in the return air duct and field-wired to terminals SR+
and SR- on the economizer.
4. Program Optional Room Stat
Program the optional room stat. Separate detailed
instructions for programming the room stat ship with
the optional room stat.
Verify that all economizer sensors needed for your
application are properly installed and wired.
2. Set Minimum Outside Air
Set the minimum outside air position. HV-1 is
designed for 0-30% outside air and HV-2 is designed
for 31-75% outside air.
All economizer options, EC-1, EC-2, EC-3 and
EC-4 and option MB-1 use a potentiometer to
set the minimum outside air damper position.
The potentiometer is located on the economizer
for options EC-1, EC-2, EC-3 and EC-4. The
potentiometer may be factory-mounted in the unit
control center or field-mounted in the space for option
MB-1.
MB-2 and MB-3 use an external signal from a building
management system to position the dampers.
MB-4 uses a manual quadrant located on the inlet
damper to position the dampers.
Model IG / IGX Make-Up Air
32
®
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Bleed-Off
Valve
Pump
Filter
Supply
Connection
Float
Valve
Threaded Float
Adjustment
Start-Up - Evaporative Cooling
(optional)
Overflow
1. Check the Installation
The media may
have been removed
during installation,
so its orientation
45º
should be double
checked. The media
Entering Air
Leaving Air
should be installed
with the steeper
flute angle sloping
15º
Evaporative Cooler Set-Up
down towards the entering air side.
Verify that the stainless steel caps and distribution
headers are in place. The headers should be located
over the media towards the entering air side. The caps
should be placed over the headers.
Temperature
Setting
t2 settings
t1 settings
2. Check the Pump Filter
Check that the pump filter is around the pump inlet.
3. Fill the Sump and Adjust the Float
Turn on the water supply and allow the sump tank to
fill. Adjust the float valve to shut-off the water supply
when the sump is filled to within 1 in. of the bottom of
the overflow.
Evaporative Freeze
Protection
Evaporative
Timer
4. Break-In the Media
Open the bleed-off valve completely and saturate
the media with the blower(s) off for no less than
20 minutes.
NOTE
A jumper will need to be installed in the control
center to power the evaporative pumps with the
blower(s) off. Reference the unit’s ladder diagram to
determine proper terminals.
5. Check the Flow Rate
The pumps should provide enough water to saturate
the media in 45 to 60 seconds. Consult the factory, if
adequate flow is not achieved.
6. Adjust the Water Bleed-Off Rate
The water bleed-off rate is dependent on the water’s
mineral content. The bleed-off should be adjusted
based on the media’s mineral deposits after two
weeks of service.
7. Set the Optional Auto Drain and Fill
Set the auto drain, fill timer and temperature settings.
Temperature is typically set to 45ºF / 7ºC
Timer settings are: t1: 1.0, 10min
t2: 0.4, 60h
8. Put the Unit into Service
Remove the jumper, and energize the blower(s). Verify
proper operation.
IMPORTANT
Check the media for minerals after two weeks of
service and adjust the bleed-off rate accordingly.
Model IG / IGX Make-Up Air
33
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4. Close Solenoid
Start-Up - Water Wizard™ (optional)
With the pressure set, press the Function key
L1
L2
L3
for one second to deactivate Flow Test Mode
and allow the supply solenoid to close.
5. Check Media
Function
Enter
Up
Start the cooling cycle and check the media after one
hour of operation. If the media is continuously dry or if
too much water is draining from the sump tank, refer
to Troubleshooting, Water Wizard™.
Down
Water Wizard™ User Interface
Key Function Description
NOTE
Steps 6 through 8 are provided to adjust the
minimum cooling temperature. The minimum cooling
is preset to the factory recommended 75ºF (24ºC).
Only adjust if needed.
1. Open the Solenoid
Confirm that the manual water supply valve
is closed. Press and hold the Function key
for one second. L3 will begin blinking (short on, long
off), indicating that Flow Test Mode is active and the
supply solenoid is open.
NOTE
The inlet air sensor function overrides and shuts
down the evaporative cooler if the outside
temperature falls below the minimum cooling
temperature.
WARNING
Opening the manual supply valve will allow water
to pass to the media. Be sure the sump is safely
draining before opening the manual supply valve.
6. Enter Program Mode
Press and hold
NOTE
the Enter key
The manual supply valve ships closed and must be
adjusted for proper performance.
for three seconds. The
display will read “Pro”
when Program Mode is
2. Set the Water Pressure
active.
Program Display
With the solenoid open, set the supply water
pressure to the correct setting from the
7. Adjust the Minimum Cooling
following tables. Use the manual supply valve to adjust
the supply pressure. A pressure gauge is provided
between the manual supply valve and the media.
Temperature
While in the
Program Menu,
use the Up and
Down keys to
navigate the
NOTE
The recommended water pressure for the model IGX
is set based on media width, model IG is set based
on air volume. A table is provided for each. Be sure
to refer to the correct table.
Menu Options
until “toF” is
displayed. Press the
Minimum Cooling
Temperature Display
Enter key to access the selected Menu Option setting.
IGX
Housing
Media Width
(inches)
Water Pressure
(in. wg)
Use the Up and Down keys to adjust the Minimum
Cooling Temperature as needed. Press the Enter key
to save the Minimum Cooling Temperature setting and
return to the Program Menu.
12
22
30
433
48
20
36
42
61
72
42
60
NOTE
66
32
The Enter key must be pressed to save the new
minimum cooling temperature.
96*
*Multiple media sections. Value represents total media width.
8. Exit Program Mode
After ten seconds of idle time the controller will exit
Program Mode.
Model IG
CFM Range
Water Pressure
(in. wg)
800 – 3500
50
74
3501 – 7000
3. Break-In Media
Leave the supply solenoid open to saturate and
break-in media for 20 minutes with the blower off.
Model IG / IGX Make-Up Air
34
®
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NOTE
CAUTION
The Freeze Temperature is preset to the factory
recommended 45ºF. Steps 9-11 should only
be completed if the Freeze Temperature needs
adjustment.
The sump drain line must be clear and draining to a
safe location before using Flow Test Mode.
CAUTION
Be aware of the water level in the sump tank at all
times when using the Flow Test Mode.
NOTE
The Freeze Temperature is the temperature at which
the supply solenoid closes and the drain solenoid
opens to drain the supply line, preventing possible
freeze damage. A drain solenoid is required for this
option.
Program Mode
Program Mode allows the user to view the Program
Menu and edit the factory default settings. To access
Program Mode and view the Program Menu press and
hold the Enter key for three seconds. While viewing
the Program Menu press the Up and Down keys to
scroll through the Menu Options. To view the setting
of the selected Menu Option, press the Enter key.
To edit the setting, press the Up or Down key while
viewing the setting. To save the setting and return to
the Program Menu, press the Enter key. To return to
the Program Menu without saving the change, wait
10 seconds. To exit Program Mode from the Program
Menu, wait 10 seconds.
9. Enter Program Mode
Press and hold
the Enter key
for three seconds. The
display will read “Pro”
when Program Mode is
active.
Program Display
10. Adjust the Freeze Temperature
While in Program Mode, use the Up and Down
keys to navigate
WARNING
through the
Menu Options
until “Frt” is
displayed. Press
Changing the default settings will significantly affect
performance. Only change a setting after reading
and understanding this entire manual.
WARNING
the Enter key to access
the selected Menu
Option setting.
The Enter key must be pressed to save any changes
made to a setting.
Freeze Temperature
Display
Use the Up and Down keys to adjust the Freeze
Temperature setting as needed. Press the Enter key to
set the Freeze Temperature and return to the Program
Menu.
Dry Bulb Temperature
The dry bulb temperature is visible on the home
screen. If a number is not visible, wait 15 seconds
and use the Up and Down keys until a number is
displayed.
NOTE
Wet Bulb Temperature
To view the Wet Bulb Temperature, simultaneously
press and hold the Up and Down keys.
The Enter key must be pressed to save the new
freeze temperature.
11. Exit Program Mode
After ten seconds of idle time the controller will exit
Program Mode.
Indicating Lights
Three indicating lights are located across the top
of the display to indicate the status of the Water
Wizard™.
Operation-Water Wizard™ (optional)
Light Status
Drain Mode locks open the drain solenoid
and drains the supply line between the supply
solenoid and the media. To activate Drain Mode,
simultaneously press the Function and Enter keys (L2
will light). To deactivate Drain Mode and unlock the
drain solenoid, simultaneously press the Function and
Enter keys again.
Blinking
Long on, short off
Blinking
Short on, long off
Indicating
Light
On
Off
Call for cooling.
Outdoor temperature
lockout.
Call for No call for
cooling cooling
L1
N/A
Drain
solenoid solenoid
open closed
Drain
Supply solenoid open.
Drain solenoid closed.
L2
L3
N/A
Flow Test Mode - Activating Flow Test Mode
opens the supply solenoid and allows water to pass to
the manual supply valve. To activate Flow Test Mode,
press and hold the Function key for one second (L3
will flash). To deactivate Flow Test Mode and allow the
supply solenoid to close, press and hold the Function
key again for one second.
Cooling Cooling
on off
Supply solenoid
locked closed
Flow test mode active
Model IG / IGX Make-Up Air
35
®
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Building Pressure Control —
a variable frequency drive is
controlled according to input from a
pressure sensing device.
BLOWER
Check Operation - VAV Units
(optional)
EXHAUST
(OPTIONAL)
SUPPLY
MAIN VALVES
HEAT
NOTE
DIRTY FILTERS
(OPTIONAL)
Turn both knobs to the upper most
pressure setting. You may have to
remove the outdoor pressure tap
tubing. VAV systems should go to
maximum speed. Set both knobs
at the lowest setting and the VAV
systems should go to minimum
speed.
70
75
65
60
55
80
85
Blower Start-Up, Steps 1-5 should be performed
before the blower is run.
90
NOTE
PHOTOHELIC
For maintenance issues associated with variable
frequency drives, consult the drive’s manual
supplied with the unit. The drives are programmed
at the factory and should not need any adjustment
during installation and start-up. For kitchen
applications, the drive may be located in the kitchen
or in the unit.
Building
Pressure Control
Reset the correct pressure limits
before starting the unit.
Pressure Indicating
Needle
Pressure Setting
Needles
This picture depicts a typical
photohelic setting. Typical
settings are 0.0 in. wg for
the lower pressure setting
and 0.10 in. wg for the upper
pressure setting. The needle
indicates a negative building
pressure. During correct
Variable Volume Operation
The variable volume option is recommended when
a building’s exhaust volume may vary. This option
enables the make-up air volume to track with the
exhaust volume, providing only the amount of make-
up air required. Control strategies include 2-speed
VFD motors and modulating blowers. Before the unit
is left in service, the variable volume control system
should be tested.
operation, the indicating
needle will remain between
or near the setting needles.
Pressure Setting Knobs
Photohelic Gauge
External Signal — a variable
frequency drive is controlled according to input from
an external 2-10 VDC or 4-20 mA signal (by others).
2-Speed VFD Motor
A variable frequency drive (VFD) is used on a single
speed motor to control air volumes. The VFD is
factory-programmed for 2 speed operations. It can be
switched to low or high speed from a remote control
panel. Turn the fan speed switch on the remote control
panel to each position and confirm that the fan speed
adjusts accordingly.
A 2 VDC or 4 mA signal will send the blower to low
speed. The blower will go to maximum speed with a
10 VDC or 20 mA signal.
Variable Kitchen Control — A variable frequency
drive is controlled by input from a remote speed
control. This unit allows automatic adjustment of
make-up air volumes based on varying cooking loads.
Modulating
Potentiometer Control — a variable frequency drive
is controlled by input from a remote
BLOWERS
EXHAUST
(OPTIONAL)
speed selector (potentiometer). This
unit allows easy manual adjustment
SUPPLY
MAIN VALVES
HEAT
of make-up air volumes. To test
potentiometer operation, turn the
potentiometer to the two extremes.
DIRTY FILTERS
70
75
65
80
(OPTIONAL)
60
85
55
90
With variable volume, make sure the
fan goes to maximum and minimum
speed.
When the potentiometer is at 0, the
fan speed will be at its minimum.
When the potentiometer is at 100,
the fan will be at its maximum speed.
Potentiometer
Control
Model IG / IGX Make-Up Air
36
®
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Building Pressure Control - a
modulating spring return actuator
is used to control the return air
amounts. The return air damper
modulates from fully open to fully
closed based on a signal from a
remote pressure sensing device.
Check Operation - Recirculating
Units (optional)
BLOWER
EXHAUST
(OPTIONAL)
SUPPLY
MAIN VALVES
HEAT
NOTE
DIRTY FILTERS
(OPTIONAL)
70
75
65
60
55
80
85
90
Blower Start-Up, steps 1-5 should be performed
before the blower is run.
Turn both knobs to the upper most
pressure setting. You may have to
remove the outdoor pressure tap
tubing. The return air damper should
close.
PHOTOHELIC
Recirculation Operation
The recirculation operation option is recommended
when the ventilation equipment provides the primary
source of heating for the space. Recirculation can
vary from 100% return air to 100% outside air. Control
strategies include 2-position and modulating dampers.
Building
Pressure Control
Set both knobs at the lowest setting and the damper
should open. It may take one to two minutes for the
damper to reach the desired position.
Before the unit is left in service, the recirculation
control system should be tested.
Reset the correct pressure limits before starting the
unit.
This picture shows
Pressure Indicating Pressure Setting
2-Position Damper
A 2-position spring return actuator is used to control
the return air amounts. The damper moves from open
to closed. If power is cut to the unit,
the outdoor air damper will fail to
close.
Needle
Needles
a typical photohelic
setting. Typical settings
are 0.0 in. wg for the
lower and 0.10 in. wg
for the upper pressure
setting. The needle in
this photo indicates
a negative building
pressure. During correct
operation, the indicating
needle will remain
EXHAUST
BLOWER
(OPTIONAL)
SUPPLY
MAIN VALVES
HEAT
RECIRCULATION
Turn the recirculating switch on
the remote control panel to each
position and confirm that the return
air damper adjusts accordingly. The
damper actuator may take a few
minutes to open or close.
DIRTY FILTERS
(OPTIONAL)
70
75
65
60
55
80
85
90
Pressure Setting Knobs
Photohelic Gauge
2-Position
Damper Control
between or near the setting
needles.
External Signal - a modulating spring return actuator
is used to control the return air amounts. Return air
damper modulates from fully open to fully closed
based on an external 2-10 VDC or 4-20 mA signal (by
others).
Modulating
Potentiometer Control - a modulating spring return
actuator is used to control the return air amounts. The
return air damper modulates from fully open to fully
closed based on a signal from a remote potentiometer.
The return air damper will close with a 10 VDC or
20 mA signal. The return air damper should open with
a 2 VDC or 4mA signal. The damper actuator may take
a few minutes to open or close.
To test potentiometer operation,
turn the potentiometer to the two
extremes. Confirm that the return air
BLOWERS
EXHAUST
(OPTIONAL)
SUPPLY
MAIN VALVES
HEAT
damper fully opens and fully closes.
When the potentiometer is at 0, the
return air damper will open. When the
DIRTY FILTERS
70
75
65
80
(OPTIONAL)
60
85
55
90
potentiometer is at 100, the return
air damper will close. The damper
actuator may take a few minutes to
open or close.
Potentiometer
Control
Model IG / IGX Make-Up Air
37
®
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4. Ignition Controller (IC1) Sequence of Operation
Sequence of Operation
2:1 Staged Sequence
•
•
The N.O. contact on air proving switch (PS2) is open
The ignition controller (IC1) energizes the
combustion blower relay (CR)
N.O. contact on combustion blower relay (CR)
closes
Power passes to and energizes the combustion
blower (CM)
1. Exhaust Fan Contact (S1) Manually Closed
(optional)
•
•
•
Power passes through N.C. contact on exhaust fan
overload (ST2 OL), which is closed if exhaust fan
(M2) has not overloaded
•
•
Power passes to exhaust fan starter (ST2)
N.O. contact on exhaust fan starter (ST2) is
energized and closed
•
•
The N.O. contact on air proving switch (PS2) closes
The ignition controller (IC1) begins a 15 second
pre-purge
•
Power passes to and energizes exhaust fan (M2)
•
The high fire relay (RT3) is energized and the N.O.
contact on high fire relay (RT3) closes
2. Supply Fan Contact (S2) Manually Closed
•
•
•
•
•
The main gas valve (MV) fully opens (100%)
Igniter begins sparking
10 second trial for ignition begins
The furnace will light at high fire (100%)
When the flame is detected, the igniter stops
sparking
The furnace will remain at high fire (100%) for at
least 10 seconds
High fire contact (RT3) will open
Furnace stages to maintain the discharge air
•
Power passes through N.C. field-supplied fire
contact (FSC)
•
Power passes through optional N.O. contact on
exhaust fan starter (ST2), which is closed when the
optional exhaust starter (ST2) is activated
Power passes through N.C. contact on supply
starter overload (ST1 OL), which is closed if the
supply fan has not overloaded
Power passes through N.C. contact on optional
freeze protection timer (RT4), which is closed if the
temperature has remained above the set point
•
•
•
•
•
temperature set point (SC1)
•
•
Power passes to and energizes optional inlet
damper (D1), which opens
5. High Fire – Low Fire Sequence of Operation
•
The furnace lights at high fire (100%) and remains
at high fire for 10 seconds
Power passes through optional damper limit switch
(DL1), which is energized and closed if the optional
inlet damper is open. It may take several minutes
for the damper to fully open and for the damper
limit switch to close
•
If the discharge temperature is above the discharge
air sensor (TS2) set point, the N.O. furnace stage 2
controller contact (SC2), will open and the furnace
will go to low fire (50%)
If the furnace is at low fire (50%) and the discharge
temperature is above the discharge air sensor
(TS2) set point, the furnace stage 1 contact (SC1)
will open and the furnace will shut down
If the furnace is at low fire (50%) and the discharge
temperature is below the discharge air sensor (TS2)
set point, the furnace stage 2 contact (SC2) will
close and the furnace will go to high fire
•
•
Power passes to and energizes fan relay (RF)
•
•
Power passes through N.O. contact on fan relay
(RF), which is closed once the fan relay (RF) is
activated
Power passes to and energizes starter relay (ST1)
N.O. contact on supply fan starter (ST1) is
energized and closed
Supply fan (M1) starts
•
•
•
3. Heat Contact (S4) Manually Closed
6. Optional Evaporative Cooling Contact (S4)
Closed*
•
Power passes through N.O. fan relay (RF), which is
energized and closed if the supply fan (M1) is on
•
N.O. contact on fan relay (RF) is energized and
closed
•
Power passes through N.C. contact on optional
inlet air sensor (TS4), which is closed if inlet air
temperature is below the set point
Power passes to and energizes the heat relay (RH)
N.O. contact on heat relay (RH) closes
•
Power passes through N.O. contact on optional
inlet air sensor (TS4), which is energized and
closed if the inlet air temperature is above the set
point
Power passes to and energizes cool relay (RC)
N.O. contact on cool relay (RC) is energized and
•
•
•
•
•
•
24 VAC is supplied to stage controller (SC1)
If the discharge temperature is less than the set
point on the discharge air sensor (TS2) and the
high temperature limit control (HLC1) has not
been tripped, the N.O. contact for furnace stage
controller will close
closed
•
Power passes to evaporative cooling pump (P1)
*If DX or chilled water coils are used rather than an
evaporative cooler, the cooling sequence of operation
will depend on the coil controls. Cooling coil controls are
supplied by others.
•
Power will be supplied to the ignition controller
(IC1), which will begin its sequence of operation
Model IG / IGX Make-Up Air
38
®
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amplifier (AMP) sends a call for heating to the
ignition controller (IC1)
Sequence of Operation
2:1 Modulation Sequence
4. Ignition Controller (IC1) Sequence of Operation
•
•
The N.O. contact on air proving switch (PS2) is open
1. Exhaust Fan Contact (S1) Manually Closed
(optional)
The ignition controller (IC1) energizes the
combustion blower relay (CR)
N.O. contact on combustion blower relay (CR)
closes
Power passes to and energizes the combustion
blower (CM)
•
Power passes through N.C. contact on exhaust fan
overload (ST2 OL), which is closed if exhaust fan
(M2) has not overloaded
•
•
•
•
Power passes to exhaust fan starter (ST2)
N.O. contact on exhaust fan starter (ST2) is
energized and closed
Power passes to and energizes exhaust fan (M2)
•
•
The N.O. contact on air proving switch (PS2) closes
The ignition controller (IC1) begins a 15 second
•
pre-purge
2. Supply Fan Contact (S2) Manually Closed
•
•
The high fire relay (RT3) is energized and the N.O.
contact on high fire relay (RT3) closes
The main gas valve (MV) fully opens (100%) and the
modulating gas valve (MOD) opens to high fire
Igniter begins sparking
10 second trial for ignition begins
The furnace will light at high fire (100%)
When the flame is detected, the igniter stops
sparking
The furnace will remain at high fire (100%) for at
least 10 seconds
High fire contact (RT3) will open
Furnace modulates to maintain the temperature
•
Power passes through N.C. field-supplied fire
contact (FSC)
•
Power passes through optional N.O. contact on
exhaust fan starter (ST2), which is closed when the
optional exhaust starter (ST2) is activated
•
•
•
•
•
•
Power passes through N.C. contact on supply
starter overload (ST1 OL), which is closed if the
supply fan has not overloaded
Power passes through N.C. contact on optional
freeze protection timer (RT4), which is closed if the
temperature has remained above the set point
•
•
•
Power passes to and energizes optional inlet
damper (D1), which opens
•
•
Power passes through optional damper limit switch
(DL1), which is energized and closed if the optional
inlet damper is open. It may take several minutes
for the damper to fully open and for the damper
limit switch to close
selector (TS3) set point
5. High Fire – Low Fire Sequence of Operation
•
The furnace lights at and remains at high fire
(100%) for 10 seconds
•
If the discharge temperature sensor (TS2) reading
is above the temperature selector (TS3) set point,
and furnace is not at low fire, the amplifier will
adjust the modulating gas valve (MOD) down until
the discharge temperature sensor (TS2) reading
equals the temperature selector (TS3) setting
If the discharge temperature sensor (TS2) reading
is below the temperature selector (TS3) set point,
and the furnace is not at high fire, the amplifier will
adjust the modulating gas valve (MOD) up until the
discharge temperature sensor (TS2) reading equals
the temperature selector (TS3) setting
If the furnace is at low fire and the discharge
temperature sensor (TS2) reading is above the
temperature selector (TS3) set point, the amplifier
will end the call for heat and the ignition controller
(IC1) will shut down the furnace
•
•
Power passes to and energizes fan relay (RF)
Power passes through N.O. contact on fan relay
(RF), which is closed once the fan relay (RF) is
activated
•
•
Power passes to and energizes starter relay (ST1)
N.O. contact on supply fan starter (ST1) is
•
•
energized and closed
•
Supply fan (M1) starts
3. Heat Contact (S4) Manually Closed
•
Power passes through N.O. contact on fan relay
(RF), which is energized and closed if the supply
fan (M1) is on
•
Power passes through the N.C. contact on optional
inlet air sensor (TS4), which is closed if inlet air
temperature is below set point
•
•
Power passes to and energizes the heat relay (RH)
6. Optional Evaporative Cooling Contact (S4)
Closed*
Power passes to N.C. contact on high temperature
limit control (HLC1), which remains closed if it has
not been tripped
•
N.O. contact on fan relay (RF) is energized and
closed
•
•
N.O. contact on heat relay (RH) closes
24 VAC is supplied to ignition controller (IC1) and
•
Power passes through N.O. contact on optional
inlet air sensor (TS4), which is energized and
closed if the inlet air temperature is above the set
point
amplifier (AMP)
•
If the discharge air sensor (TS2) reading is less
than the temperature selector (TS3) setting, the
•
Power passes to and energizes cool relay (RC)
Model IG / IGX Make-Up Air
39
®
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Sequence of Operation
Operation
2:1 Modulation Sequence, continued
4:1 Modulation and
8:1 Staged Controller
•
•
N.O. contact on cool relay (RC) is energized and
closed
Power passes to evaporative cooling pump (P1)
L1
L2
L3
*If DX or chilled water coils are used rather than an
evaporative cooler, the cooling sequence of operation
will depend on the coil controls. Cooling coil controls are
supplied by others.
Function
Enter
Up
Down
Water Wizard™ User Interface
Key Function Description
Program Mode
Program Mode allows the user to view the Program
Menu and edit the factory default settings. To access
Program Mode and view the Setpoints Menu, press
and hold the Function key for three seconds. While
viewing the Setpoints Menu, press the Up or Down
key to scroll through the menu options. To view the
setting of the selected menu option, press the Enter
key. To edit the setting, press the Up or Down key
while viewing the setting. To save the setting and
return to the Setpoints Menu press the Enter key.
To return to the Setpoints Menu without saving the
change, wait 15 seconds. To exit Program Mode from
the Setpoints Menu, wait 15 seconds.
WARNING
Changing the default settings will significantly affect
performance. Only change a setting after reading
and understanding this entire manual.
NOTE
The Enter key must be pressed to save any changes
made to a setting.
Inlet Air Sensor (iAS)
The inlet air sensor monitors the temperature of the
inlet air. If the inlet air is above the sensor’s set point,
the inlet air sensor shuts off the furnace and continues
to supply the warm outside air. The inlet air sensor is
preset to the factory recommended 65ºF for 8:1 and
60ºF for 4:1.
Discharge Air Temperature (dtS)
The discharge air temperature setting is the
temperature that the unit will discharge. The discharge
air temperature is preset to the factory recommended
70ºF. The actual discharge air temperature is the
default display.
Outside Air Temperature (OAt)
To temporarily display the outside air temperature, use
the Up or Down key until the display reads “OAt,” then
press the Enter key.
Model IG / IGX Make-Up Air
40
®
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Program Revision Number
Sequence of Operation
To access the program revision number from the default
display, press the Up or Down key until the display reads
F##, J## or I##. The two numbers following the letter
indicate the revision number. For example, F12 indicates
program F, revision twelve.
4:1 Electronic Modulation
1. Exhaust Fan Contact (S1) Manually Closed
(optional)
•
Power passes through N.C. contact on exhaust fan
overload (ST2 OL), which is closed if exhaust fan
(M2) has not overloaded
Optional Room Override (ROt)
When the room override function is triggered, the
discharge air temperature (70ºF default) is temporarily
changed to the room override setting (90ºF default).
When the room override function is released the
discharge air temperature returns to the default
temperature.
•
•
Power passes to exhaust fan starter (ST2)
N.O. contact on exhaust fan starter (ST2) is
energized and closed
•
Power passes to and energizes exhaust fan (M2)
2. Supply Fan Contact (S2) Manually Closed
Indicating Lights
Three indicating lights are located across the top of
the display to indicate the status of the furnace.
•
Power passes through N.C. field-supplied fire
contact (FSC)
•
Power passes through optional N.O. contact on
exhaust fan starter (ST2), which is closed when the
optional exhaust starter (ST2) is activated
4:1 Electronic Modulation
Light
L1
On
Call for Heat
Off
Blinking
High fire
•
•
Power passes through N.C. contact on supply
starter overload (ST1 OL), which is closed if the
supply fan has not overloaded
Power passes through N.C. contact on optional
freeze protection timer (RT4), which is closed if the
temperature has remained above the set point
No call for heat
Call for heat
No call for heat
L2
L3
sent to ignition sent to ignition
controller controller
Combustion fan Combustion fan
high speed low speed
High fire
High fire
•
•
Power passes to and energizes optional inlet
damper (D1), which opens
8:1 Staged Control
(Single Furnace Units)
Power passes through optional damper limit switch
(DL1), which is energized and closed if the optional
inlet damper is open. It may take several minutes
for the damper to fully open and for the damper
limit switch to close
Light
L1
On
Call for heat
n/a
Off
No call for heat
n/a
Blinking
N/A
L2
High fire
n/a
L3
Burner interlock
n/a
8:1 Staged Control
(Multi Furnace Units)
•
•
Power passes to and energizes fan relay (RF)
Power passes through N.O. contact on fan relay
(RF), which is closed once the fan relay (RF) is
activated
Power passes to and energizes starter relay (ST1)
N.O. contact on supply fan starter (ST1) is
Light
L1
On
n/a
n/a
Off
n/a
n/a
Blinking
n/a
L2
Alarm
•
•
Saving new
setting
L3
Program Mode
n/a
energized and closed
•
Supply fan (M1) starts
3. Heat Contact (S4) Manually Closed
•
Power passes through N.O. contact on fan relay
(RF), which is energized and closed if the supply
fan (M1) is on
•
•
•
Power passes to and energizes the heat relay (RH)
N.O. contact on heat relay (RH) closes
Power passes to N.C. contact on high temperature
limit control (HLC1), which remains closed if it has
not been tripped
•
•
24 VAC is supplied to ignition controller (IC1)
The modulating controller (SC1) compares the
inlet air temperature to the inlet air set point (iAS,
FX Program Menu). If the inlet air temperature is
below the set point, the modulating controller (SC1)
closes N.O. contact (FUR 1) and sends a call for
heat to the ignition controller (IC1)
Model IG / IGX Make-Up Air
41
®
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Sequence of Operation
4:1 Electronic Modulation, continued
•
•
Power passes to and energizes cool relay (RC)
N.O. contact on cool relay (RC) is energized and
closed
4. Ignition Controller (IC1) Sequence of Operation
•
The N.O. contact on air proving switch (PS2) is open
•
The ignition controller (IC1) energizes the induction
•
Power passes to evaporative cooling pump (P1)
relay (IR)
*If DX or chilled water coils are used rather than an
evaporative cooler, the cooling sequence of operation
will depend on the coil controls. Cooling coil controls are
supplied by others.
•
•
N.O. contact on induction relay (IR) closes
Power passes to and energizes the combustion
blower (CM), sending it to high speed
•
•
•
The N.O. contact on air proving switch (PS2) and
high pressure switch (PS5) closes
The ignition controller (IC1) begins a 15 second
pre-purge
The main gas valve (MV) fully opens (100%) and the
modulating gas valve (MOD) opens to high fire
•
•
•
•
Igniter begins sparking
10 second trial for ignition begins
The furnace will light at high fire (100%)
When the flame is detected, the igniter stops
sparking
•
•
The furnace will remain at high fire (100%) for 30
seconds
The modulation controller (SC1) will adjust the
modulating gas valve (MOD) and the combustion
blower (CM) as needed between low and high fire
•
The modulating controller (SC1) will monitor the
high pressure switch (PS5) and run the furnace at
low fire if the high pressure switch is not satisfied
5. High Fire – Low Fire Sequence of Operation
•
The furnace lights at and remains at high fire
(100%) for 30 seconds
•
If the discharge temperature sensor (TS2) reading
is above the discharge temperature setting (dtS,
FX Program Menu), and the furnace is not at low
fire, the modulating controller (SC1) will adjust
the modulating gas valve (MOD) down until the
discharge temperature sensor (TS2) reading
equals the discharge temperature setting (dtS, FX
Program Menu)
•
If the discharge temperature sensor (TS2) reading
is below the discharge temperature setting (dtS,
FX Program Menu), and the furnace is not at high
fire, the modulating controller (SC1) will adjust the
modulating gas valve (MOD) up until the discharge
temperature sensor (TS2) reading equals the
discharge temperature setting (dtS, FX Program
Menu)
6. Optional Evaporative Cooling Contact (S4)
Closed*
•
N.O. contact on fan relay (RF) is energized and
closed
•
Power passes through N.O. contact on inlet air
sensor (TS4), which is energized and closed if the
inlet air temperature is above the set point
Model IG / IGX Make-Up Air
42
®
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•
•
N.O. contact on combustion blower relay (CR)
closes
Power passes to and energizes the combustion
Sequence of Operation
8:1 Staged Control
blower (CM)
1. Exhaust Fan Contact (S1) Manually Closed
(optional)
•
•
The N.O. contact on air proving switch (PS2) closes
Power passes to and energizes air proving switch
relay (R9)
N.O. contacts on air proving switch (R9) closes
The ignition controller (IC) completes a 30 second
pre-purge
•
Power passes through N.C. contact on exhaust fan
overload (ST2 OL), which is closed if exhaust fan
(M2) has not overloaded
•
•
•
•
Power passes to exhaust fan starter (ST2)
N.O. contact on exhaust fan starter (ST2) is
energized and closed
Power passes to and energizes exhaust fan (M2)
•
•
•
•
•
The main gas valve (MV) fully opens (100%)
Igniter begins sparking
10 second trial for ignition begins
The furnace will light
The stage controller (SC1) will choose which stage
to light the furnace at based on the discharge air
temperature setting (dtS, FX Program Menu) and
the outside air temperature (TS1)
When the flame is detected, the igniter stops
sparking
The furnace will remain at high fire (100%) for 20
seconds
The stage controller (SC1) will stage the main gas
valves (MV#) as needed between low fire, high fire
and off
If the furnace is at low fire and the discharge
temperature sensor (TS2) reading remains above
the discharge air temperature setting (dtS, FX
Program Menu) for more than six minutes, the
furnace will shut down
•
2. Supply Fan Contact (S2) Manually Closed
•
Power passes through N.C. field-supplied fire
contact (FSC)
•
Power passes through optional N.O. contact on
exhaust fan starter (ST2), which is closed when the
optional exhaust starter (ST2) is activated
Power passes through N.C. contact on supply
starter overload (ST1 OL), which is closed if the
supply fan has not overloaded
Power passes through N.C. contact on optional
freeze protection timer (RT4), which is closed if the
temperature has remained above the set point
•
•
•
•
•
•
•
Power passes to and energizes optional inlet
damper (D1), which opens
•
Power passes through optional damper limit switch
(DL1), which is energized and closed if the optional
inlet damper is open. It may take several minutes
for the damper to fully open and for the damper
limit switch to close
5. Staging Control Sequence of Operation
•
•
Power passes to and energizes fan relay (RF)
•
•
•
If the discharge temperature (TS2) is below the
discharge air temperature set point (dtS, FX
Program Menu), the furnace will stage up
If the discharge temperature (TS2) is above the
discharge air temperature set point (dtS, FX
Program Menu), the furnace will stage down
If the discharge temperature (TS2) is above the
discharge air temperature set point (dtS, FX
Program Menu) and the furnace is at low fire, the
furnace will shut off
If the furnace is at high fire and the discharge air
temperature setting (dtS, FX Program Menu) is not
satisfied, the furnace will remain at high fire
Power passes through N.O. contact on fan relay
(RF), which is closed once the fan relay (RF) is
activated
Power passes to and energizes starter relay (ST1)
N.O. contact on supply fan starter (ST1) is
energized and closed
Supply fan (M1) starts
•
•
•
3. Heat Contact (S4) Manually Closed
•
Power passes through N.O. contact on fan relay
(RF), which is energized and closed if the supply
fan (M1) is on
•
•
•
•
•
Power passes to and energizes the heat relay (RH)
N.O. contact on heat relay (RH) closes
If the furnace is at low fire and the discharge air
temperature setting (dtS, FX Program Menu) is
satisfied, the furnace will shut off
The stage controller (SC1) compares the inlet
air temperature to the inlet air set point (iAS, FX
Program Menu). If the inlet air temperature is below
the discharge air setting (dtS, FX Program Menu),
the stage controller sends a call for heat to the
ignition controller (IC1)
6. Optional Evaporative Cooling Contact (S4)
Closed*
•
N.O. contact on fan relay (RF) is energized and
closed
•
Power passes through N.O. contact on optional
inlet air sensor (TS4), which is energized and
closed if the inlet air temperature is above the set
point
4. Ignition Controller (IC1) Sequence of Operation
•
The N.O. contact on air proving switch (PS2) is
open
•
The stage controller (SC1) energizes the
•
Power passes to and energizes cool relay (RC)
combustion blower relay (CR)
Model IG / IGX Make-Up Air
43
®
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Sequence of Operation
Operation and Errors -
Ignition Controller
8:1 Staged Control, continued
•
•
N.O. contact on cool relay (RC) is energized and
closed
Power passes to evaporative cooling pump (P1)
NOTE
The green LED light indicates NORMAL operation
while the red LED light indicates an ERROR
operation.
*If DX or chilled water coils are used rather than an
evaporative cooler, the cooling sequence of operation
will depend on the coil controls. Cooling coil controls are
supplied by others.
This controller is found only in the furnace control
center. It has an LED indicator light on the top right
of the controller that
will flash GREEN for
NORMAL operation or
RED for an ERROR. Some
furnace configurations
have two of these
controllers.
The following are the green LED codes of operation:
GREEN LED Indications - NORMAL OPERATION
Flash Code
Flash Code Indication
Steady on
Flame detected, main burner on
Controller is sparking
0.1 second on/off
0.5 second on/off
0.5 second on/4.5 second off
Purge or inter-purge time
Retry or recycle time
The following are the red LED codes of error:
RED LED Indications - ERROR OPERATION
Flash Code
Flash Code Indication
No flame in trial time error
Flame sense circuit error
Valve circuit error
Blinks 1 time
Blinks 2 times
Blinks 3 times
Blinks 4 times
Blinks 6 times
Blinks 7 times
Steady on
Flame loss error
Airflow error
Ground or internal error
Line voltage/frequency error
Model IG / IGX Make-Up Air
44
®
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Option EC-4
(Differential Enthalpy Control)
Operation - Economizer
This option uses one enthalpy sensor, field-installed in
the inlet of the unit. A second enthalpy sensor is field-
installed in the return air duct. A dry bulb temperature
sensor is factory-installed in the discharge of the unit.
NOTE
Only models IG-HV and IGX-HV with options EC-1,
2, 3 or 4 use an economizer.
After a call for cooling the economizer compares
the outdoor and return air enthalpies. If the outdoor
air enthalpy is greater than the return air enthalpy,
the economizer sends the dampers to the minimum
outside air position and sends a call for mechanical
cooling. If the outside enthalpy is less than the
return air enthalpy, the economizer will modulate the
Option EC-1
(Outside Air Temperature Reference)
This option uses one dry bulb temperature sensor
field-installed in the inlet of the unit. A second dry
bulb temperature sensor is factory-installed in the
discharge of the unit.
After a call for cooling, the outside air temperature is
compared to the economizer set point. If the outside
air temperature is above the economizer set point,
the economizer sends the dampers to the minimum
outside air position and calls for mechanical cooling. If
the outside air temperature is between the economizer
dampers to achieve a 55
If the outside enthalpy is less than the return air
temperature, but a 55 F mixed air temperature cannot
°F mixed air temperature.
°
be achieved, the programmable room thermostat may
call for mechanical cooling.
set point and 55
to the 100% outside air position. If the outside air
is less than 55 F, the economizer modulates the
°F, the economizer sends the dampers
°
dampers to achieve a 55°F mixed air temperature.
Option EC-2
(Outside Air Enthalpy Reference)
This option uses one enthalpy sensor field-installed in
the inlet of the unit. A dry bulb temperature sensor is
installed in the discharge of the unit.
After a call for cooling, the outside air enthalpy is
compared to the field-adjustable enthalpy changeover
set point. If the outside air enthalpy is less than the
set point, the dampers will modulate to provide a 55
°F
mixed air temperature. If the outside air enthalpy is
greater than the set point, the economizer sends the
damper to the minimum outside air position and sends
a call for mechanical cooling.
Option EC-3
(Differential Temperature Control)
This option uses one dry bulb temperature sensor
field-installed in the inlet of the unit. A second dry bulb
temperature sensor is field-installed in the return air
duct. A third dry bulb temperature sensor is factory-
installed in the discharge of the unit.
After a call for cooling the economizer compares the
outdoor and return air temperatures. If the outdoor
air temperature is greater than the return air dry bulb
temperature, the economizer sends the dampers to
the minimum outside air position and sends a call for
mechanical cooling. If the outside air temperature is
less than the return air temperature, the economizer
will modulate the dampers to achieve a 55
air temperature. If the outside air temperature is less
than the return air temperature, but a 55 F mixed air
°F mixed
°
temperature cannot be achieved, the programmable
room thermostat may call for mechanical cooling.
Model IG / IGX Make-Up Air
45
®
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Troubleshooting
Blower Does Not Operate
No
Proper supply power at
main disconnect
Check Main Voltage
(See Blower Start-Up Step #1)
Main Disconnect (DS1) Off
(Turn Main Disconnect DS1 On)
Primary Fuses Blown
Yes
(Replace Fuses)
No
No
No
No
No
24 VAC between
terminals R and X?
Main Transformer (TR1) Defective
Yes
(Replace Transformer)
24 VAC between
terminals G and X?
Supply Switch (S2) Off
(Turn Supply Switch (S2) On)
Fire system contact (FSC) tripped/not installed
(Correct/Replace)
Yes
24 VAC across
terminals 3 and X?
Supply Fan Overload (ST1 OL) Tripped
(Reset and check motor amps, reference Blower Start-Up #4)
Optional Exhaust Fan Interlocks (ST2-ST5) Open
(Correct/Replace)
Yes
24 VAC across
terminals 4 and X?
Yes
(Optional) Freeze Protection (RT4) Tripped
(Reset)
24 VAC across A2 and A1 on
supply contactor (ST1)
(Optional) Damper Limit Switch (DL1) Holding
(Wait for actuator to open fully or adjust limit switch)
(Optional) Damper Limit Switch Jumper Missing
(Install jumper, reference the unit ladder diagram for terminals)
Fan Relay (RF) is not energized
Yes
(Check for loose connection) (Repair or replace relay)
Broken Fan Belt
(Replace - Reference V-Belt drives in the Maintenance section)
Defective motor or capacitor
(Repair/Replace)
Blown Motor Fuse
(Replace)
One or more legs of 3 phase is out
(Restore missing legs)
At this time the supply contactor (ST1) should pull in,
passing power to the supply motor
and the blower should start.
Model IG / IGX Make-Up Air
46
®
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Troubleshooting
Motor Over Amps
Yes
Yes
No
Air volume too high?
Adjust drives or increase external
static pressure as needed.
No
(Reference Blower Start-Up Step #5)
Actual static pressure
lower than design?
No
Adjust drives to reduce blower RPM.
(Reference Blower Start-Up Step #5)
Blower rotation correct?
Yes
Reverse blower rotation.
(Reference Blower Start-Up Step #2)
No
Motor voltage correct?
Yes
Provide proper power supply.
(Reference Blower Start-Up Step #1)
Yes
Yes
Motor horsepower too low?
No
Resize motor.
Shorted windings in motor?
Yes
Replace motor.
Everything is working
properly, consult factory.
Model IG / IGX Make-Up Air
47
®
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Troubleshooting
Insufficient Airflow
Yes
Yes
Yes
Yes
Yes
Yes
Damper(s) not fully opened?
No
Adjust damper linkage(s), or replace faulty actuator(s).
(Damper actuators may take a few minutes to open)
System static losses too high?
No
Reduce losses by improving ductwork.
Blower speed too low?
No
Adjust drives as needed.
(Reference Blower Start-Up – Step #5)
Filters dirty or clogged?
No
Clean or replace filters.
(Reference Filters in the Maintenance section)
Leaks in ductwork?
No
Repair leaks.
Belt slipping?
Yes
Replace or tighten belt.
(Reference V-Belt Drives in the Maintenance section)
Everything is working properly,
consult factory.
Too Much Airflow
Yes
Yes
Yes
Blower speed too high?
No
Adjust drives as needed.
(Reference Blower Start-Up – Step #5)
Filters not in place?
No
Install filters.
Insufficient external static
pressure?
No
Increase external static pressure.
Everything is working properly,
consult factory.
Model IG / IGX Make-Up Air
48
®
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Troubleshooting
Excessive Noise or Vibration
Yes
Belts worn or loose?
Replace worn belts or tighten loose belts.
(Reference V-Belt Drives in the Maintenance section)
No
No
Sheaves aligned?
Align sheaves.
(Reference V-Belt Drives in the Maintenance section)
Yes
Yes
Yes
Yes
Wheel(s) unbalanced?
Clean and/or balance wheel(s).
No
Bearings worn or need
lubrication?
Replace worn bearings or lubricate bearings as needed.
(Reference Bearings in the Maintenance section)
No
Wheel(s) rubbing on inlet?
Adjust wheel(s) or inlet.
No
At this time noise and vibration should
be at acceptable levels.
Model IG / IGX Make-Up Air
49
®
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Troubleshooting
Single or 2:1 Stage Furnace Will Not Light
No
24 VAC across R and X?
Main disconnect (DS1) open or defective
Close, repair or replace
Yes
Main transformer (TR1) fault
Replace main transformer
No
24 VAC across W1 and X?
Yes
Heat Switch (S4) open
(Turn Heat Switch (S4) on)
No
24 VAC across 22 and 21?
Yes
Heating Transformer (TR2) Fault
Replace heating transformer
No
24 VAC across 24 VAC and
21 on SC1 controller?
Optional inlet air sensor (TS4) open
Adjust setting. Reference Blower Start-Up, Step #6
Heat relay (RH) is not energized
Yes
24 VAC across A and 21?
Yes
Check for loose connections. Repair or replace heat relay (RH)
No
Discharge air selector (TS2) improperly set or faulty
Adjust setting (see Staged Start-Up) or replace sensor
Furnace stage one contact (SC1) defective (stage only)
Replace furnace stage one contact
Yes
Yes
Yes
Yes
High limit (HLC1) open?
No
Discharge temperature was above high limit setting.
Wait for high limit to cool and reset.
Ignition controller (IC#)
red LED
blinks 7 times or is on
No
Ignition controller (IC1) failed.
(Replace ignition controller)
Ignition controller (IC#)
red LED
blinks 6 times
Combustion blower (CM) not functioning
Replace combustion blower or relay (CR)
Air proving switch (PS2) defective.
Replace air proving switch
No
Ignition controller (IC#)
red LED blinks
1 time, 2 times or 4 times
Improper manifold pressure
Set high and low manifold pressure (refer to Single Stage or
2:1 Staged Control Start-Up section)
Yes
Faulty spark rod or spark gap does not equal 1/8 inch
Everything is working
properly, consult factory.
Replace spark rod or adjust gap to 1⁄8 inch
Model IG / IGX Make-Up Air
50
®
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Troubleshooting
2:1 Modulating Furnace Will Not Light
No
24 VAC across R and X?
Main disconnect (DS1) open or defective
Close, repair or replace
Yes
Main transformer (TR1) fault
Replace main transformer
No
24 VAC across W1 and X?
Yes
Heat switch (S4) open or not wired
Close or replace heat switch (S4)
No
24 VAC across S and T?
Yes
Heat transformer (TR5) fault
Replace heating transformer
Discharge temperature was above high limit control (HLC1)
Wait for high limit to cool and reset.
No
24 VAC across C and T?
Optional inlet air sensor contact (TS4 open)
Adjust setting reference Blower Start-Up, Step #6
Heat relay (RH) is not energized
Yes
Check for loose connections. Repair or replace heat relay (RH)
No
24 VAC across A and T?
Yes
Discharge air selector (TS3) improperly set or faulty
Adjust setting (see staged start-up) or replace sensor
Ignition controller (IC#)
Yes
red LED
blinks 7 times or is on
No
Ignition controller (IC1) failed
(Replace ignition controller)
Ignition controller (IC#)
Yes
red LED
blinks 6 times
Combustion blower (CM) not functioning
Replace combustion blower or relay (CM)
Air proving switch (PS2) defective
Replace air proving switch
No
Ignition controller (IC#)
Yes
red LED blinks
1 time, 2 times or 4 times
Improper manifold pressure
Set high and low manifold pressure (refer to the 2:1 Electronic
Modulation Start-Up section)
Yes
Faulty spark rod or spark gap does not equal 1/8 inch
Everything is working
properly, consult factory.
Replace spark rod or adjust gap to 1⁄8 inch
Model IG / IGX Make-Up Air
51
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Troubleshooting
4:1 Modulating Furnace Will Not Light
No
24 VAC across R and X?
Main disconnect (DS1) open or defective
Close, repair or replace
Yes
Main transformer (TR1) fault
Replace main transformer
No
24 VAC across W1 and X?
Yes
Heat switch (S4) open or not wired
Close or replace heat switch (S4)
No
24 VAC across 22 and 21?
Yes
Heat transformer (TR2) fault
Replace heating transformer
No
Yes
Yes
Yes
N.O. contact on
heat relay (RH) closed?
Yes
Heat relay (RH) is not energized
Check for loose connections. Repair or replace heat relay (RH)
DT1 displayed
on furnace controller (SC1)?
No
Discharge air sensor (TS2) not wired or defective
Wire or replace discharge air sensor (TS2)
OT1 displayed
on furnace controller (SC1)?
No
Outdoor air sensor (TS1) not wired or defective
Wire or replace outdoor temperature sensor (TS1)
Blank screen
on furnace controller (SC1)?
No
Furnace controller (SC1) defective or not powered
Replace or wire furnace controller (SC1)
No
24 VAC across
terminals S and T?
Discharge temperature was above high limit control (HLC1)
Wait for high limit to cool and reset
Yes
Inlet air sensor contact open
Adjust inlet air sensor setting (refer to 4:1 Modulation Start-Up section)
Furnace controller (SC1) defective
Replace furnace controller (SC1)
Continues on next page...
Model IG / IGX Make-Up Air
52
®
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Troubleshooting
4:1 Modulating Furnace Will Not Light
...continued from previous page
Yes
High limit switch (HLC#) open?
No
Discharge temperature was above high limit setting
Let cool, then reset high limit.
Ignition controller (IC#)
Yes
red LED blinks
7 times or is on
No
Ignition controller(s) (IC#) failed
Replace faulty ignition controller(s)
Yes
No
No
No
Yes
Ignition controller (IC#)
red LED blinks 6 times
Pressure switch (PS2) failure
Repair or replace pressure switch (PS2)
Combustion blower (CM) not functioning
Replace fusing (FU7), combustion blower or relay (CM)
No
24 VAC between terminals
1 and 2 on the Amplifier (AMP)
Yes
Secondary transformer (TR6) defective
Replace secondary transformer (TR6)
10 VDC between terminals
5 and 6 on the Amplifier (AMP)
Yes
Furnace controller (SC1) defective
Replace furnace controller (SC1)
24 VDC between terminals
3 and 4 on the Amplifier (AMP)
Yes
Amplifier (AMP) defective
Replace amplifier (AMP)
Ignition controller (IC#)
red LED blinks
1 time, 2 times or 4 times
Improper manifold pressure
Set high and low manifold pressure
No
(refer to 4:1 Electronic Modulation Start-Up section)
Faulty spark rod or spark gap does not equal 1/8 inch
Everything is working properly,
consult factory.
Replace spark rod or adjust gap to 1⁄8 inch
Model IG / IGX Make-Up Air
53
®
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Troubleshooting
8:1 Staged Furnace Will Not Light
No
24 VAC across R and X?
Main disconnect (DS1) open or defective
Close, repair or replace
Yes
Main transformer (TR1) fault
Replace main transformer
No
24 VAC across W1 and X?
Yes
Heat switch (S4) open or not wired
Close or replace heat switch (S4)
No
24 VAC across 22 and 21?
Yes
Heat transformer (TR2) fault
Replace heating transformer
No
Yes
Yes
Yes
N.O. contact on heat relay (RH)
closed?
Yes
Heat relay (RH) is not energized
Check for loose connections. Repair of replace heat relay (RH)
DT1 displayed on furnace
controller (SC1)?
No
Discharge air sensor (TS2) not wired or defective
Wire or replace discharge air sensor (TS2)
OT1 displayed on furnace
controller (SC1)?
No
Outdoor air sensor (TS1) not wired or defective
Wire or replace outdoor temperature sensor (TS1)
Blank screen on furnace
controller (SC1)?
No
Furnace controller (SC1) defective or not powered
Replace or wire furnace controller (SC1)
No
24 VAC across terminals
S and T?
Discharge temperature was above high limit control (HLC1)
Wait for high limit to cool and reset
Yes
Inlet air sensor contact open
Adjust inlet air sensor setting (refer to 8:1 Staged Start-Up section)
Furnace controller (SC1) defective
With the combustion blower
(CM) off, is the N.O.
airflow switch (PS2) closed?
Yes
Replace furnace controller (SC1)
No
Airflow switch (PS2) defective
Replace defective airflow switch (PS2)
Continues on next page...
Model IG / IGX Make-Up Air
54
®
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Troubleshooting
8:1 Staged Furnace Will Not Light
... continued from
previous page.
With the combustion blower
(CM) on for at least
No
30 seconds, is there
24 VAC across T and A or E?
Yes
Furnace controller (SC1) defective
Replace furnace controller (SC1)
Ignition controller (IC#)
Yes
red LED
blinks 7 times or is on
No
Ignition controller(s) (IC#) failed
Replace faulty ignition controller(s)
Ignition controller (IC#)
Yes
red LED blinks
1 time, 2 times or 4 times
Improper manifold pressure
Set high and low manifold pressure
(refer to 8:1 Staged Start-Up section)
No
Faulty spark rod or spark gap does not equal 1/8 inch
Cycle power to the unit
and wait 30 seconds
Replace spark rod or adjust gap to 1⁄8 inch
No
Does the combustion relay
(R9 or CR) close?
Internal high limit tripped (temperature above set point)
Let temperatures cool
Internal inlet air sensor open
Yes
Adjust inlet air sensor setting (refer to 8:1 Staged Start-Up section)
Combustion relay (R9 or CR) defective
Replace defective combustion relay (R9 or CR)
No
Does the combustion
blower (CM) run?
Combustion blower fuse (FU9) blown
Replace combustion blower fuse (FU9)
Combustion blower (CM) defective
Replace defective combustion blower (CM)
Yes
Does the combustion
blower stop after
Yes
30 seconds of operation?
Airflow switch (PS2) defective
Replace defective airflow switch (PS2)
Airflow relay (R9) defective
No
Replace defective airflow relay (R9)
Everything is working properly,
consult factory.
Model IG / IGX Make-Up Air
55
®
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Troubleshooting
Evaporative Cooler does not Operate (Recirculating pump)
Supply fan must be on for cooler to operate
No
24 VAC between terminals
Cool switch (S4) off
Y1 and X
(turn cool switch (S4) on)
Cool switch not wired
(wire cool switch (S4))
Yes
No
No
24 VAC between terminal A2 on
Cooling Relay (RC) and X
Optional inlet air sensor (TS4) holding
(Adjust TS4 setting. Reference Blower Start-Up – Step #6)
Yes
115 VAC between terminals
102 and 101
Cooling transformer (TR4) defective
(Replace transformer)
Yes
No
115 VAC between terminal
114 and 101
Cooling relay (RC) is not energized
(Check for loose connections)
(Repair or replace relay)
Yes
At this time the evaporative cooler pumps should be on
Water Blows through Evaporative Cooler
Are the headers in place and
No
located near the entering
air side of the media?
Replace headers and/or move the headers
Yes
Yes
Yes
Water supply greater than
evaporation and bleed-off rate?
Use the main supply valve to reduce the supply of water
No
Air velocity greater than
specified?
Reduce the air velocity through the media
(Reference Blower Start-Up – Step #5)
No
At this time the evaporative cooler should be
operating without water blowing through
Model IG / IGX Make-Up Air
56
®
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Troubleshooting
Water Wizard™ — Improper Water Supply
NOTE
NOTE
If the water supply is too low, the media will
continuously appear dry.
Changing the On Time Factor by (1) will change the
water supply by approximately 3%.
NOTE
IMPORTANT
If the water supply is too high, the media will be
saturated and excessive water will be draining from
the sump tank.
The Enter key must be pressed to save the new On
Time Factor.
4. Exit Program Mode
After 15 seconds of idle time the controller will
automatically exit Program Mode.
NOTE
Some water drainage is desired to keep the media
flushed, but it should be minimized to utilize the
Water Wizard™.
1. Adjust the Manual Supply Valve
Adjust the manual supply valve (refer to Start-Up,
Water Wizard™). If the recommended water pressure
does not provide enough water, increase the pressure
until the desired water supply is achieved. If the
recommended water pressure provides too much
water, decrease the water pressure until the desired
water supply is achieved.
CAUTION
Only proceed to Steps 2 and 3 if Step 1 does not
correct the problem.
2. Enter Program Mode
Press and hold
the Enter key for
three seconds to enter
Program Mode. The
display will read “Pro”
when Program Mode is
active.
3. Adjust the On Time Factor
While in the
Program Menu,
use the Up and
Down keys to
navigate through
the menu options
until “ont” is displayed.
With “ont” displayed, press the Enter key to access
the setting.
With the setting displayed, use the Up and Down keys
to adjust the setting as needed.
Increase the factor to increase the water supply or
decrease the factor to decrease the water supply.
Press the Enter key to save the new On Time Factor
and return to the Program Menu.
Model IG / IGX Make-Up Air
57
®
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Maintenance - Routine
Wheels
CAUTION
Wheels require little attention when moving clean air.
Occasionally oil and dust may accumulate on the
wheel causing imbalance. When this occurs the wheel
and housing should be cleaned to assure proper
operation.
Lock-out the gas and the electrical power to the
unit before performing any maintenance or service
operations to this unit.
V-Belt Drives
V-belt drives must be checked on a regular basis for
wear, tension, alignment, and dirt accumulation.
Bearings
The bearings for our fans are carefully selected to
match the maximum load and operating conditions
of the specific class, arrangement and fan size.
The instructions provided in this manual and those
provided by the bearing manufacturer will minimize
any bearing problems.
Check the tension by measuring the deflection in the
belt as shown below.
Check the alignment by using a straight edge across
both sheaves as shown below.
IMPORTANT
IMPORTANT
Premature or frequent belt failures can be caused by
improper belt tension, or misaligned sheaves.
Lubricate bearings prior to periods of extended
shutdowns or storage and rotate shaft monthly to
aid in corrosion prevention. If the fan is stored more
than three months, purge the bearings with new
grease prior to start-up.
• Abnormally high belt tension or drive misalignment
will cause excessive bearing loads and may result
in failure of the fan and/or motor bearings.
• Abnormally low belt tension will cause squealing
on start-up, excessive belt flutter, slippage, and
overheated sheaves.
Recommended Bearing Lubrication Schedule
(in months*)
IMPORTANT
Bearing Bore Size (inches)
Fan
RPM
Do not pry belts on or off the sheave. Loosen belt
tension until belts can be removed by simply lifting
the belts off the sheaves.
1
⁄
2
-1
11⁄8 -11⁄2
15⁄8 -17⁄8 115⁄16 -23⁄16
27⁄16 -3
250
500
6
6
6
5
3
3
2
1
6
6
4
2
2
1
1
6
5
6
4
6
6
5
5
5
5
IMPORTANT
750
3
3
When replacing V-belts on multiple groove drives,
all belts should be changed to provide uniform drive
loading.
1000
1250
1500
2000
1
1
1
1
1
0.5
0.25
IMPORTANT
0.5
Do not install new belts on worn sheaves. If the
sheaves have grooves worn in them, they must be
replaced before new belts are installed.
*Suggested initial greasing interval is based on 12 hour per
day operation and 150°F maximum housing temperature.
For continuous (24 hour) operation, decrease greasing
interval by 50%
Belt Span
Deflection =
• If extended grease lines are present, relubricate while in
operation, only without endangering personnel.
64
• For ball bearings (operating) relubricate until clean grease
is seen purging at the seals. Be sure not to unseat the seal
by over lubricating.
• For ball bearings (idle) add 1-2 shots of grease up to 2
inch bore size, and 4-5 shots above 2 inch bore sizes with
a hand grease gun.
• For roller bearings add 4 shots of grease up to 2 inch bore
size, and 8 shots for 2-5 inch bore size with a hand grease
gun.
Belt Span
Belt Tension
• Adjust relubrication frequency based on condition of
purged grease.
• A high quality lithium based grease conforming to NLGI
Grade 2 consistency, such as those listed here:
Drive Alignment
Mobil 532
Mobilux #2
Texaco Multifak #2 B Shell Alavania #2
Texaco Premium #2 Exxon Unirex #2
Snow Accumulation
Clear snow away from roof mounted units. Keep the
snow clear of the intake and access doors.
Model IG / IGX Make-Up Air
58
®
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Motors
Evaporative Coolers
Motor maintenance is generally limited to cleaning
and lubrication (where applicable).
The media should be periodically brushed lightly with
a soft bristle brush in an up and down motion while
flushing with water. This aids in reducing the amount
of mineral build-up.
Cleaning should be limited to exterior surfaces only.
Removing dust and grease build-up on the motor
assures proper motor cooling.
For large amounts of mineral build-up, clean or
replace the media and increase the water bleed-off or
flush rate.
Motors supplied with grease fittings should be
greased in accordance with the manufacturer’s
recommendations.
The cooling media has a useful life of 3 to 5 years
depending on the water quality and the bleed-off or
flush rate.
IMPORTANT
Do not allow water or solvents to enter the motor
or bearings. Motors and bearings should never be
sprayed with steam, water or solvents.
IMPORTANT
When reinstalling the evaporative media, make sure
that it is installed correctly. Reference the drawing
shown below.
IMPORTANT
Greasing motors is only intended when fittings are
provided. Many motors are permanently lubricated,
requiring no additional lubrication.
IMPORTANT
Replacement media should be from the same
manufacturer and be the same size as the original
media provided with the unit.
Filters
Filter maintenance is generally limited to cleaning and
replacement.
45º
If aluminum mesh filters are installed, they can be
washed in warm soapy water.
An adhesive spray can be added to aluminum mesh
filters to increase their efficiency.
Entering Air
Leaving Air
If disposable filters are installed, they can be checked
by holding up to a light source. If light cannot pass
through the filter, it should be replaced.
15º
Media Orientation
IMPORTANT
When reinstalling filters, be sure to install them
with the airflow in the correct direction. An airflow
direction arrow is located on the side of the filters.
Cooling Coils
WARNING
Repair and replacement of the coil and the
connecting piping, valves, etc., should be performed
by a qualified individual.
IMPORTANT
Replacement filters should be from the same
manufacturer and the same size as the original
filters provided with the unit.
Inspect the coil for signs of corrosion and/or leaks.
Repair any leaks as required.
Chilled Water Coils
Inspect the coil’s surface for foreign material. If the
coil surface needs cleaning, clean the coil from the
leaving air-side so that foreign material will be washed
out of the coil rather than pushed farther in.
Test the circulating fluid for sediment, corrosive
products and biological contaminants. Make the
necessary corrective measures.
Maintain adequate fluid velocities and proper filtering
of the fluid.
Inspect and clean the drain pan to prevent the growth
of algae and other organisms.
If automatic air vents are not utilized, periodic venting
of the coil is recommended to remove accumulated
air.
IMPORTANT
Be sure to read and follow the manufacturer’s
recommendations before using any cleaning fluid.
CAUTION
Caution should be used to avoid injury when venting
the coil. High pressure and/or high temperature
fluids can cause serious injuries.
Model IG / IGX Make-Up Air
59
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Maintenance - Fall
High Limit
Heat Exchanger
The high limit switch may have tripped over the
summer; it should be checked and reset if necessary.
The heat exchanger should be checked annually for
cracks. If a crack is detected, the heat exchanger
should be replaced before the unit is put back into
operation. Also, airflow across the heat exchanger
should be checked to make sure the blower is
operating properly.
CAUTION
Lock-out the gas and the electrical power to the
unit before performing any maintenance or service
operations to this unit.
Flue Collector Box
The flue passageway and flue collector box should be
inspected prior to each heating season and cleared of
any debris.
Gas Line
Remove the drip leg and clean any liquid or debris
that may have accumulated. Once the drip leg is
cleaned, reattach it.
Electrical Wiring
The electrical wiring should be checked annually for
loose connections or deterioration.
Gas Train
The gas connections, joints and valves should be
checked annually for tightness. Apply a soap and
water solution to all piping; watch for bubbling which
indicates a leak. Other leak testing methods can be
used.
Replacement Parts
When ordering replacement parts, include the
complete unit model number and serial number listed
on the unit nameplate.
Evaporative Coolers
The water should be shut off and all the lines drained
when the outside temperature drops below 45ºF.
Vent Piping
Remove any debris from the drip legs on the
combustion air and exhaust pipes.
Remove drain plugs for the winter.
Burners and Orifices
Before each heating season, examine the burners and
gas orifices to make sure they are clear of any debris
such as spider webs, etc. Clean burner as follows:
Clean all interior parts of any mineral deposits or
foreign materials that may have built-up during the
cooling season.
• Turn off both electrical and gas supplies to the unit.
• Disconnect union between manifold and gas valve.
• Remove manifold and burner assembly.
• Inspect and clean orifices and burners as
necessary. Avoid using any hard or sharp
instruments which could cause damage to the
orifices or burners.
Replace any worn or non-functioning parts.
Winterizing Chilled Water Coils
During the winter, chilled water coils need to be
protected against freezing. Manufacturer recommends
protecting the coils by either blowing-out the coils or
by flushing the coils.
Blowing-Out Coils
- Remove any soot deposits from the burner with
a wire brush.
- Clean the ports with an aerosol degreaser or
compressed air.
- Wipe the inside of the burner clean. Cleaning
the burner with a degreaser will slow the future
build-up of dirt.
1. Close valves on the supply and return lines.
2. Open drain valves and/or drain plug. Remove
vent plug to allow coil to drain faster.
3. After coil is fully drained, connect a blower to the
caps. Do not connect the blower to the air vent
or drain plug.
4. Close the vent plug on the header that the blower
is connected to. Open the drain valve or cap on
the other header.
5. Turn on blower for 30 minutes. Place mirror at
discharge. If the mirror fogs up, repeat procedure
until no fog appears on the mirror.
• Before reinstalling the burner assembly, look down
the heat exchanger tubes to make sure they are
clear of any debris.
• Reinstall manifold and burner assembly, reconnect
wire leads and gas supply piping.
6. After drying the coil, wait a few minutes then
repeat Step #5.
7. Leave drains open and do not install plugs until
beginning of cooling season.
• Turn on the electrical power and gas supply.
• Follow the start-up procedure to light the burners
and verify proper operation.
Model IG / IGX Make-Up Air
60
®
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Flushing Coils
Manufacturer recommends the use of inhibited glycol
(such as propylene or ethylene) to flush water coils
to protect against freezing. Additionally, the use of
inhibited glycol provides corrosion protection.
The table below indicates the percentage of glycol
required to prevent freezing in a coil at a given outdoor
air freeze point. Completely fill coil with solution. Drain
coil. Residual glycol fluid per these concentrations
can be left in the coil without concern of freezing.
Recovered fluid can be used to flush other coils.
Percent of
Ethylene
Glycol
Percent of
Propylene
Glycol
Freeze Point
Freeze Point
ºF
ºC
ºF
ºC
by Volume
by Volume
0
0
0
32
25
0
32
26
19
8
-4
-3
10
20
30
40
50
60
10
20
30
40
50
60
-9
-7
16
-16
-25
-37
-48
-13
-22
-33
-51
3
-13
-34
-55
-7
-28
-60
Model IG / IGX Make-Up Air
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Reference - Model IG Venting Connection Location
Exhaust Outlet
Venting Location Dimensions
Combustion Air Inlet
IG
Housing
A
B
C
D
E
G
10
20
30
3.89
3.91
3.91
5.12
3.89
3.89
9.12
7.89
7.89
11.59
11.62
11.62
23.11
25.34
25.34
27.58
32.27
32.27
Discharge End
Dimensions are in inches.
Dimensions B and E are not needed for standard venting. A round
adapter should be used for the exhaust connection.
F
E
Flue Connection Size (diameter in inches)
D
Standard
Exhaust
4.0
Non-Concentric
Concentric
IG
Housing
Exhaust
4.0
Intake
4.0
Exhaust
Intake
6.0
10
20
30
4.0
6.0
6.0
A
3/4-inch Gas Connection
6.0
6.0
6.0
8.0
B
6.0
6.0
6.0
8.0
C
Reference - Model IGX Venting Connection Location
Exhaust Air Outlet
Combustion Air Intake
Airflow
D
C
A
B
Flue Connection Size (diameter in inches)
Non-Concentric Concentric
Exhaust Intake Exhaust
4.0 4.0
IGX
Housing
Furnace Size
(MBH)
A
B
C
D
Standard
Exhaust
4.0
Intake
6.0
6.0
8.0
8.0
6.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
100
150
200
250
150
200
250
300
350
400
500
600
350
400
500
600
700
800
1050
1200
4.45
4.45
5.64
5.64
4.45
5.67
5.67
5.67
5.67
5.67
5.67
5.67
5.96
5.96
5.96
5.96
5.96
5.96
5.96
5.96
8.45
8.45
9.64
9.64
8.45
9.67
9.67
9.67
9.67
9.67
9.67
9.67
9.71
9.71
9.71
9.71
9.71
9.71
9.71
9.71
23.43
23.43
23.97
23.97
29.38
24.97
24.97
24.97
19.01
19.01
24.97
24.97
28.31
28.31
28.31
28.31
28.31
28.31
28.31
28.31
27.90
27.90
30.90
30.90
33.85
31.90
31.90
31.90
25.94
25.94
31.90
31.90
35.24
35.24
35.24
35.24
35.24
35.24
35.24
35.24
4.0
4.0
6.0
6.0
4.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
4.0
6.0
6.0
4.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
4.0
6.0
6.0
4.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
4.0
6.0
6.0
4.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
12
22
32
6.0
6.0
6.0
Dimensions are in inches. Dimensions A and C are not needed for standard venting.
Model IG / IGX Make-Up Air
62
®
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16. Stage Controller - Provides single or two stage
control of the furnace.
17. Airflow Switch - Monitors the airflow inside the
Reference - Model IG
(Single or 2 Stage)
heat exchanger.
22
24
11
18. Ignition Controller - Controls the ignition of the
20
17
19
10
25
furnace. Maintains safe operation of the furnace.
19. Evaporative Cooling Fuses (Optional) - Provides
proper fusing to evaporative cooling pump and
controls.
14
13
6
4
3
1
8
7
20. Transformer Fuse (Optional) - Provides proper
16
16
15
18
fusing for evaporative cooling transformer.
9
2
21. Cooling Relay (Optional) - Allows power to pass
to cooling controls.
22. Reset Timer (Optional) - Resets cooling system
NOTE
This is a typical blower control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
to run a time interval.
23. Auto Drain Relay (Optional) - Assures supply
pump does not operate during drain interval.
Allows pump to operate in cooling mode.
24. Cooling Timer (Optional) - Allows for automatic
draining of the evaporative cooling system based
on time schedule.
25. Dirty Filter Switch (Optional) - Monitors filter
pressure drop. Turns on indicating light when
pressure drop is above field adjustable set point.
1. Supply Motor Starter - 24 volt magnetic contacts
for starting supply motor.
2. Supply Overload - Provides electronic overload
protection to supply motor.
3. Low Voltage Transformer - Provides low voltage
to fan/heat/cooling enable controls, staged
furnace controls and optional evaporative cooling
controls.
Staged Gas
Valve
Gas
Pressure
Test Port
3/4 inch
Gas Supply
Connection
Manifold
4. Control Terminal Block - Provides wiring access
to controls.
5. Fan Relay - Allows power to pass to energize
motor starter.
6. Control Terminal Block - Provides wiring access
to fan/heat/cooling enable controls.
7. Auxiliary Contact (Optional) - Provides one
normally closed and one normally open contact
for other equipment.
8. Exhaust Motor Starter (Optional) - 24 volt
magnetic contacts for starting exhaust motor.
9. Exhaust Overload (Optional) - Provides
electronic overload protection to exhaust motor.
10. Exhaust Fuses (Optional) - Provides proper
fusing for exhaust fan motor(s).
11. Building Freeze Protection Timer (Optional) -
Prevents the discharge of cold air into the
building.
12. Heat Relay - Allows power to pass to heating
controls.
13. Low Voltage Transformer - Provides low voltage
to the ignition controller.
14. Heating Terminal Block - Provides wiring access
to heating controls.
15. Inlet Air Sensor (Optional) - Outdoor air stat that
automatically controls the heating and/or cooling
based on outdoor air temperature.
Model IG / IGX Make-Up Air
63
®
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16. Stage Controller - Provides 8 stage control of the
Reference - Model IG
(8:1 Staged)
furnace.
17. Airflow Switch - Monitors the airflow inside the
heat exchanger.
24
11
22
17
18. Ignition Controller - Controls the ignition of the
20
19
25
10
furnace. Maintains safe operation of the furnace.
16
19. Evaporative Cooling Fuses (Optional) - Provides
proper fusing to evaporative cooling pump and
controls.
14
13
6
4
1
8
7
20. Transformer Fuse (Optional) - Provides proper
18
15
18
3
fusing for evaporative cooling transformer.
9
2
21. Cooling Relay (Optional) - Allows power to pass
to cooling controls.
22. Reset Timer (Optional) - Resets cooling system
NOTE
This is a typical blower control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
to run a time interval.
23. Auto Drain Relay (Optional) - Assures supply
pump does not operate during drain interval.
Allows pump to operate in cooling mode.
24. Cooling Timer (Optional) - Allows for automatic
draining of the evaporative cooling system based
on time schedule.
1. Supply Motor Starter - 24 volt magnetic contacts
for starting supply motor.
25. Dirty Filter Switch (Optional) - Monitors filter
pressure drop. Turns on indicating light when
pressure drop is above field adjustable set point.
2. Supply Overload - Provides electronic overload
protection to supply motor.
3. Low Voltage Transformer - Provides low voltage
to fan/heat/cooling enable controls, staged
furnace controls and optional evaporative cooling
controls.
3/4 inch
Gas Supply
Connection
Staged Gas
Valves
Gas
Pressure
Test Port
4. Control Terminal Block - Provides wiring access
Gas Pressure
Test Port
to controls.
Small
Manifold
Large
Manifold
5. Fan Relay - Allows power to pass to energize
motor starter.
6. Control Terminal Block - Provides wiring access
to fan/heat/cooling enable controls.
7. Auxiliary Contact (Optional) - Provides one
normally closed and one normally open contact
for other equipment.
8. Exhaust Motor Starter (Optional) - 24 volt
magnetic contacts for starting exhaust motor.
9. Exhaust Overload (Optional) - Provides
electronic overload protection to exhaust motor.
10. Exhaust Fuses (Optional) - Provides proper
fusing for exhaust fan motor(s).
11. Building Freeze Protection Timer (Optional) -
Prevents the discharge of cold air into the
building.
12. Heat Relay - Allows power to pass to heating
controls.
13. Low Voltage Transformer - Provides low voltage
to the ignition controller.
14. Heating Terminal Block - Provides wiring access
to heating controls.
15. Inlet Air Sensor (Optional) - Outdoor air stat that
automatically controls the heating and/or cooling
based on outdoor air temperature.
Model IG / IGX Make-Up Air
64
®
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16. Amplifier - Controls the modulating valve based
on the input from the temperature selector and the
discharge air sensor.
Reference - Model IG
(2:1 Modulation)
17. Airflow Switch - Monitors the airflow inside the
11
18
17
heat exchanger.
21
20
26
10
18. Temperature Selector - Allows the user to adjust
23
25
discharge air temperature.
14
19. Ignition Controller - Controls the ignition of the
13
6
4
3
furnace. Maintains safe operation of the furnace.
1
8
7
20. Evaporative Cooling Fuses (Optional) - Provides
proper fusing to evaporative cooling pump and
controls.
15
19
16
9
2
21. Transformer Fuse (Optional) - Provides proper
fusing for evaporative cooling transformer.
22. Cooling Relay (Optional) - Allows power to pass
NOTE
This is a typical blower control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
to cooling controls.
23. Reset Timer (Optional) - Resets cooling system
to run a time interval.
24. Auto Drain Relay (Optional) - Assures supply
pump does not operate during drain interval.
Allows pump to operate in cooling mode.
1. Supply Motor Starter - 24 volt magnetic contacts
for starting supply motor.
25. Cooling Timer (Optional) - Allows for automatic
draining of the evaporative cooling system based
on time schedule.
26. Dirty Filter Switch (Optional) - Monitors filter
pressure drop. Turns on indicating light when
pressure drop is above field adjustable set point.
2. Supply Overload - Provides electronic overload
protection to supply motor.
3. Low Voltage Transformer - Provides low voltage
to fan/heat/cooling enable controls, modulating
furnace controls and optional evaporative cooling
controls.
4. Control Terminal Block - Provides wiring access
Gas Pressure
Test Port
to controls.
3/4 inch
Gas Supply
Connection
5. Fan Relay - Allows power to pass to energize
Manifold
motor starter.
6. Control Terminal Block - Provides wiring access
Staged
Gas Valve
to fan/heat/cooling enable controls.
7. Auxiliary Contact (Optional) - Provides one
normally closed and one normally open contact
for other equipment.
Modulating
Gas Valve
8. Exhaust Motor Starter (Optional) - 24 volt
magnetic contacts for starting exhaust motor.
9. Exhaust Overload (Optional) - Provides
electronic overload protection to exhaust motor.
10. Exhaust Fuses (Optional) - Provides proper
fusing for exhaust fan motor(s).
11. Building Freeze Protection Timer (Optional) -
Prevents the discharge of cold air into the
building.
12. Heat Relay - Allows power to pass to heating
controls.
13. Low Voltage Transformer - Provides low voltage
to the ignition controller.
14. Heating Terminal Block - Provides wiring access
to heating controls.
15. Inlet Air Sensor (Optional) - Outdoor air stat that
automatically controls the heating and/or cooling
based on outdoor air temperature.
Model IG / IGX Make-Up Air
65
®
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16. Modulation Controller - Provides 4:1 modulating
Reference - Model IG
(4:1 Modulation)
turndown control of the furnace.
17. Amplifier - Controls the modulating valve based
on the input from the modulation controller
settings and the discharge air sensor.
25
11
23
18
20 21
10
26
18
18. Airflow Switch - Monitors the airflow inside the
16
heat exchanger.
14
19. Ignition Controller - Controls the ignition of the
13
6
4
furnace. Maintains safe operation of the furnace.
1
8
7
20. Modulation Controller (Optional) - Provides
15
19
17
3
proper fusing to modulation controller.
9
2
21. Transformer Fuse (Optional) - Provides proper
fusing to low voltage transformer.
22. Cooling Relay (Optional) - Allows power to pass
to cooling controls.
23. Reset Timer (Optional) - Resets cooling system
NOTE
This is a typical blower control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
to run a time interval.
24. Auto Drain Relay (Optional) - Assures supply
pump does not operate during drain interval.
Allows pump to operate in cooling mode.
1. Supply Motor Starter - 24 volt magnetic contacts
for starting supply motor.
2. Supply Overload - Provides electronic overload
25. Cooling Timer (Optional) - Allows for automatic
draining of the evaporative cooling system based
on time schedule.
protection to supply motor.
26. Dirty Filter Switch (Optional) - Monitors filter
pressure drop. Turns on indicating light when
pressure drop is above field adjustable set point.
3. Low Voltage Transformer - Provides low voltage
to fan/heat/cooling enable controls, modulating
furnace controls and optional evaporative cooling
controls.
Modulating
Gas Valve
Gas Pressure
4. Control Terminal Block - Provides wiring access
Test Port
to controls.
3/4 inch
Gas Supply
Connection
Manifold
5. Fan Relay - Allows power to pass to energize
motor starter.
Staged
Gas Valve
6. Control Terminal Block - Provides wiring access
to fan/heat/cooling enable controls.
7. Auxiliary Contact (Optional) - Provides one
normally closed and one normally open contact
for other equipment.
8. Exhaust Motor Starter (Optional) - 24 volt
magnetic contacts for starting exhaust motor.
9. Exhaust Overload (Optional) - Provides
electronic overload protection to exhaust motor.
10. Exhaust Fuses (Optional) - Provides proper
fusing for exhaust fan motor(s).
11. Building Freeze Protection Timer (Optional) -
Prevents the discharge of cold air into the
building.
12. Heat Relay - Allows power to pass to heating
controls.
13. Low Voltage Transformer - Provides low voltage
to the ignition controller.
14. Heating Terminal Block - Provides wiring access
to heating controls.
15. Inlet Air Sensor (Optional) - Outdoor air stat that
automatically controls the heating and/or cooling
based on outdoor air temperature.
Model IG / IGX Make-Up Air
66
®
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16. Cooling Relay (Optional) - Allows power to pass
to cooling controls.
17. Reset Timer (Optional) - Resets cooling system
Reference - Model IGX
(Blower Control Center)
to run a time interval.
18. Auto Drain Relay (Optional) - Assures supply
pump does not operate during drain interval.
Allows pump to operate in cooling mode.
14
15
9
3
12
19. Cooling Timer (Optional) - Allows for automatic
draining of the evaporative cooling system based
on time schedule.
10
4
7
1
6
20. Dirty Filter Switch (Optional) - Monitors filter
pressure drop. Turns on indicating light when
pressure drop is above field adjustable set point.
17
19
8
2
13
20
NOTE
This is a typical blower control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
1. Supply Motor Starter - 24 volt magnetic contacts
for starting supply motor.
2. Supply Overload - Provides electronic overload
protection to supply motor.
3. Low Voltage Transformer - Provides low voltage
to fan/heat/cooling enable controls.
4. Control Terminal Block - Provides wiring access
to controls.
5. Fan Relay - Allows power to pass to energize
motor starter.
6. Auxiliary Contact (Optional) - Provides one
normally closed and one normally open contact
for other equipment.
7. Exhaust Motor Starter (Optional) - 24 volt
magnetic contacts for starting exhaust motor.
8. Exhaust Overload (Optional) - Provides
electronic overload protection to exhaust motor.
9. Exhaust Fuses (Optional) - Provides proper
fusing for exhaust fan motor(s).
10. Building Freeze Protection Timer (Optional) -
Prevents the discharge of cold air into the
building.
11. Heat Relay - Allows power to pass to heating
controls.
12. Low Voltage Transformer - Provides low voltage
to the optional evaporative cooling controls.
13. Inlet Air Sensor (Optional) - Outdoor air stat that
automatically controls the heating and/or cooling
based on outdoor air temperature.
14. Evaporative Cooling Fuses (Optional) - Provides
proper fusing to evaporative cooling pump and
controls.
15. Transformer Fuse (Optional) - Provides proper
fusing for evaporative cooling transformer.
Model IG / IGX Make-Up Air
67
®
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Reference - Model IGX
(Single or 2 Stage)
Reference - Model IGX
(8:1 Staged)
Manifold
Small Manifold
9
8
5
5
5
2
7
Gas Pressure
Test Port
Gas Pressure
Test Port
1
1
2
Large Manifold
7
3
6
3
Staged
Gas Valve
4
4
Gas Pressure
Test Port
3/4 inch
Gas Supply
Connection
6
10
Staged
Gas Valve
7
9
11
8
3/4 inch Gas Supply
Connection
NOTE
NOTE
This is a typical furnace control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
This is a typical furnace control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
1. Low Voltage Transformer - Provides low voltage
1. Low Voltage Transformer - Provides low voltage
to the ignition controller.
to the staged controller.
2. Low Voltage Transformer - Provides low voltage
2. Low Voltage Transformer - Provides low voltage
to the ignition stage controller.
to the ignition controllers.
3. Control Terminal Block - Provides wiring access
3. Control Terminal Block - Provides wiring access
to heat controls.
to controls.
4. Control Terminal Block - Provides wiring access
4. Control Terminal Block - Provides wiring access
to heat/combustion blower controls.
to controls.
5. Stage Controller - Provides single or two
stages of furnace control based on discharge air
temperature set point.
5. Input Converter - Receives and converts signal
from Building Management Systems (BMS).
6. Stage Controller - Provides eight stages of
6. Ignition Controller - Controls the ignition of the
control based on discharge temperature set point.
furnace. Maintains safe operation of the furnace.
7. Ignition Controllers - Controls the ignition of the
7. Combustion Blower Contact - Passes power to
furnace. Maintains safe operation of the furnace.
the combustion blower.
8. Contactor Relay - Allows power to pass to the
8. Airflow Switch - Monitors the airflow inside the
heat exchanger to ensure proper combustion
airflow.
combustion blower contact.
9. Air Proving Switch Relay - Functions as a relay
for the pressure switch.
9. High Fire Relay - Allows furnace to ignite on high
10. Combustion Blower Contact - Passes power to
fire.
the combustion blower.
11. Airflow Switch - Monitors the airflow inside the
heat exchanger.
Model IG / IGX Make-Up Air
68
®
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Reference - Model IGX
(2:1 Modulation)
Reference - Model IGX
(4:1 Modulation)
Manifold
Manifold
6
5
10
9
3
1
Gas Pressure
Test Port
Gas Pressure
Test Port
6
4
1
2
7
4
2
5
3
Modulating
Gas Valve
Staged
Gas Valve
Modulating
Gas Valve
Staged
Gas Valve
8
11
11
7
9
8
3/4 inch Gas Supply
Connection
3/4 inch Gas Supply
Connection
NOTE
NOTE
This is a typical furnace control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
This is a typical furnace control center, the control
center in your unit may be different. Reference the
ladder diagram on the inside of the control center
door for a unit specific wiring diagram.
1. Low Voltage Transformer - Provides low voltage
1. Low Voltage Transformer - Provides low voltage
to the ignition controller and amplifier.
to the ignition controller.
2. Control Terminal Block - Provides wiring access
2. Low Voltage Transformer - Provides low voltage
to heat controls.
to the 4:1 electronic modulation controller.
3. Control Terminal Block - Provides wiring access
3. Low Voltage Transformer - Provides low voltage
to heat controls.
to the amplifier.
4. Ignition Controller - Controls the ignition of the
4. Control Terminal Block - Provides wiring access
furnace. Maintains safe operation of the furnace.
to controls.
5. Amplifier - Controls the modulating valve based
on the input from the temperature selector and the
discharge air sensor.
5. Control Terminal Block - Provides wiring access
to controls.
6. Input Converter - Receives and converts signal
6. Temperature Selector - Allows the user to adjust
from Building Management System (BMS).
discharge air temperature.
7. Ignition Controllers - Controls the ignition of the
7. Combustion Blower Contact - Passes power to
furnace. Maintains safe operation of the furnace.
the combustion blower.
8. Modulation Controller - Provides 4:1 modulation
turndown control of furnace based on the
discharge air temperature.
9. Amplifier - Controls the modulating valve based
on the input from the modulation controller
settings and discharge air temperature sensor
reading.
8. Airflow Switch - Monitors the airflow inside the
heat exchanger to ensure proper combustion
airflow.
9. High Fire Relay - Allows furnace to ignite on high
fire.
10. Combustion Blower Relay - Passes power to the
variable speed combustion blower.
11. Airflow Switches - Monitors the airflow inside
the heat exchanger to ensure proper combustion
airflow.
Model IG / IGX Make-Up Air
69
®
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Reference - Performance Table
Performance Table
The following table gives the air volume in cubic feet per minute that is required to provide the desired
temperature rise for a given heating input. Model IG has a maximum 7,000 CFM capacity.
Temperature Rise (ºF)
55 60 65 70
2963 2469 2116 1852 1646 1481 1347 1235 1140 1058
Input Output
(MBH) (MBH)
25
30
35
40
45
50
75
80
85
90
95
100
741
100
150
200
250
300
350
400
500
600
700
800
1050
1200
80
988
926
871
823
780
120
160
200
240
4444 3704 3175 2778 2469 2222 2020 1852 1709 1587 1481 1389 1307 1235 1170 1111
5926 4938 4233 3704 3292 2963 2694 2469 2279 2116 1975 1852 1743 1646 1559 1481
7407 6173 5291 4630 4115 3704 3367 3086 2849 2646 2469 2315 2179 2058 1949 1852
8889 7407 6349 5556 4938 4444 4040 3704 3419 3175 2963 2778 2614 2469 2339 2222
280 10370 8642 7407 6481 5761 5185 4714 4321 3989 3704 3457 3241 3050 2881 2729 2593
320 11852 9877 8466 7407 6584 5926 5387 4938 4558 4233 3951 3704 3486 3292 3119 2963
400 14815 12346 10582 9259 8230 7407 6734 6173 5698 5291 4938 4630 4357 4115 3899 3704
480
560
640
840
960
NA
NA
NA
NA
NA
14815 12698 11111 9877 8889 8081 7407 6838 6349 5926 5556 5229 4938 4678 4444
NA
NA
NA
NA
14815 12963 11523 10370 9428 8642 7977 7407 6914 6481 6100 5761 5458 5185
NA
NA
NA
14815 13169 11852 10774 9877 9117 8466 7901 7407 6972 6584 6238 5926
NA
NA
NA
NA
NA
NA
14141 12963 11966 11111 10370 9722 9150 8642 8187 7778
NA 14815 13675 12698 11852 11111 10458 9877 9357 8889
Model IG / IGX Make-Up Air
70
®
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Reference - Start-Up Checklist
Start-Up Checklist
Unit Model Number ____________________________ (e.g. IGX-120-H32-DB)
Unit Serial Number ____________________________ (e.g. 10111000)
Start-Up Date ____________________________
Start-Up Personnel Name ____________________________
Start-Up Company ____________________________
Phone Number ____________________________
Pre Start-Up Checklist - check boxes as items are completed
o
o
o
o
o
o
Check tightness of all factory wiring connections
Verify control wiring wire gauge
Hand-rotate blower to verify free rotation
Verify supply voltage to the main disconnect
Verify the supply gas pressure
Verify remote controls wiring
Start-Up Blower Checklist - refer to Blower Start-Up section for further detail
o
o
o
o
o
o
o
Check line voltage
Check blower rotation
Check for vibration
Supply fan RPM
Motor nameplate amps
Actual motor amps
Actual CFM delivered
L1-L2 _________________ L2-L3 _______________
L1-L3 _______________
_____________ RPM
_____________ Amps
_____________ Amps
_____________ CFM
Optional Accessories - refer to Blower Start-Up section, Step #6 for further detail
o
o
o
o
Heating inlet air sensor
Cooling inlet air sensor
Building freeze protection
Dirty filter gauge
_____________ Actual Setting (Typical Setting 60-70ºF)
_____________ Actual Setting (Typical Setting 75ºF)
_____________ Actual Setting (Typical Setting 5 min; 45ºF)
_____________ Actual Setting (Typical Setting varies)
Start-Up Indirect Gas - refer to Furnace Start-Up section for further detail
Furnace 1
o
o
o
o
o
Determine furnace control type
Check supply gas pressure _____________ Maximum
Set the High Manifold pressure
Set the Low Manifold pressure
Set the unit’s operating temperature
1 Stage - 2 Stage - 8 Stage - 2:1 Mod. - 4:1 Mod.
__________ Minimum __________ Actual
_____________ in. wg
_____________ in. wg
_____________ degrees F
Furnace 2 (Optional)
o
o
o
o
Determine furnace control type
Check supply gas pressure ____________ Maximum
Set the High Manifold pressure
Set the Low Manifold pressure
1 Stage - 2 Stage - 8 Stage - 2:1 Mod. - 4:1 Mod.
__________ Minimum __________ Actual
_____________ in. wg
_____________ in. wg
Furnace 3 (Optional)
o
o
o
o
Determine furnace control type
Check supply gas pressure ____________ Maximum
Set the High Manifold pressure
Set the Low Manifold pressure
1 Stage - 2 Stage - 8 Stage - 2:1 Mod. - 4:1 Mod.
__________ Minimum
_____________ in. wg
_____________ in. wg
__________ Actual
Model IG / IGX Make-Up Air
71
®
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Maintenance Log
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from
the shipment date. Any units or parts which prove defective during the warranty period will be replaced at our option
when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer for a period of
one year. Should motors furnished by Greenheck prove defective during this period, they should be returned to the
nearest authorized motor service station. Greenheck will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Greenheck Catalogs IG, IGX, IG-HV and IGX-HV provide
additional information describing the equipment, fan
performance, available accessories, and specification data.
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides
additional safety information. This publication can be
®
470656 • IG / IGX Make-Up Air, Rev. 5, May 2012
Copyright 2012 © Greenheck Fan Corporation
72
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