INSTALLATION
INSTRUCTIONS
PRODUCT LITERATURE
Lennox Industries Inc.
Dallas, Texas
GWB9-050IH-2
GWB9-075IH-2
GWB9-100IH-2
GAS-FIRED, DIRECT VENT,
CONDENSING, HOT WATER BOILER
RETAIN THESE INSTRUCTIONS FOR
FUTURE REFERENCE
These instructions must be affixed on or
adjacent to the boiler.
!
WARNING
Improper installation, adjustment,
alteration, service, or maintenance
could result in death or serious injury.
Refer to this manual for assistance. For
additional information consult a qualified
installer, service agency, or the gas
supplier.
GAS-FIRED HOT WATER BOILERS
These low pressure gas fired hot water boilers
are design certified by CSA (Canadian Standards
Association) for use with natural and propane
gases (100 MBH model is certified for natural gas
only). They are constructed and hydrostatically
tested for a maximum working pressure of 50
psi (pounds per square inch) in accordance
with A.S.M.E. (American Society of Mechanical
Engineers) Boiler and Pressure Vessel Code
Section IV Standards for Heating Boilers.
This boiler cannot be used with all types
of chimneys. Read these instructions
carefully before installing.
P/N# 240009449, Rev. A [07/2012]
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INTRODUCTION
Dimensions....................................................................................................................2
Introduction...................................................................................................................3
Important Safety Information...........................................................................................4
Boiler Ratings & Capacities ..............................................................................................5
Boilers For Use At High Altitude........................................................................................5
Before Installing The Boiler..............................................................................................8
Boiler Installation ...........................................................................................................9
Near Boiler Piping......................................................................................................... 11
Combustion Air And Vent Pipe ........................................................................................ 22
Gas Supply Piping......................................................................................................... 28
Electrical Wiring ........................................................................................................... 30
Controls And Accessories............................................................................................... 35
Start Up......................................................................................................................37
Operating Instructions................................................................................................... 38
S9381a Integrated Boiler Control Operation And Adjustments............................................. 39
Maintenance And Cleaning............................................................................................. 45
Troubleshooting............................................................................................................ 47
Differential Air Pressure Switch Check ............................................................................. 49
Appendix A - Water Quality, Water Treatment And Freeze Protection.................................... 50
Installation And Check-Out Certificate ............................................................................. 54
Introduction
• This appliance is a gas-fired direct vent hot water boiler
• Induced draft fan draws in outside combustion air,
with cast aluminum boiler sections.
takes cooler flue gases from boiler unit and provides
positive removal of flue gases from the building
through readily available PVC and CPVC pipes.
• The heating system water absorbs large amounts of
heat from the cast aluminum heat exchanger, cooling
flue gases and causing condensation.
• These low pressure gas-fired hot water boilers are
design certified by CSA International for use with
natural gas and propane gases (90-100 model is
certified for natural gas only).
• Sealed combustion, premix gas burner, and low flame
temperature means reduced CO and NOx emissions,
which contribute to cleaner and healthier environment.
• This appliance takes its combustion air directly from
outdoors (sealed combustion) and does not compete
with building occupants for fresh air.
• Boilers are constructed and hydrostatically tested
for maximum working pressure of 50 psig (pounds
per square inch gage) in accordance with A.S.M.E.
(American Society of Mechanical Engineers) Boiler and
Pressure Vessel Code Section IV Standards for heating
boilers.
• Sealed combustion (also known as “direct vent”)
is safest and best way to obtain plenty of clean
combustion air.
3
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IMPORTANT SAFETY INFORMATION
General
Installation shall conform to requirements of author-
ity having jurisdiction or in absence of such require-
ments:
Boiler installation shall be completed by qualified agency.
See glossary for additional information.
•
United States
WARNING
!
• National Fuel Gas Code, ANSI Z223.1/NFPA 54
.
Fire, explosion, asphyxiation and electrical shock
hazard. Improper installation could result in death
or serious injury. Read this manual and understand
all requirements before beginning installation.
• National Electrical Code, NFPA 70.
• Canada
• Natural Gas and Propane Installation Code, CAN/CSA
B149.1.
• Canadian Electrical Code, Part I, Safety Standard for
Electrical Installations, CSA C22.1
Keep this manual near boiler
Retain for future reference
Become faamiliar wiith symbols identifying
potential hazards.
Where required by authority having jurisdiction,
installation shall conform to Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
This iss the safetyy aalleerrtt ssyymmbbooll.. SSyymmbbooll aalleerrttss yyoouu ttoo
potential personal injury hazzarrddss.. OObbeeyy all safety messsaaggeess
followwiinngg tthhiiss ssyymmbbooll ttoo aavooiidd ppossiblle injuury or death.
Additional manual reset low water cutoff and/or manual
reset high limit may be required.
Requirements for Commonwealth of
Massachusetts:
!
DANGER
Boiler installation must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not
limited to:
Indicates a hazardous situation which, if not avoided,
WILL result in death or serious injury
• Installation by licensed plumber or gas fitter.
!
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Installers - Follow local regulations with respect to
installation of CO (Carbon Monoxide) Detectors. Follow
maintenance recommendations“Maintenance And Cleaning”
on page 45.
!
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
NOTICE
Used to address practices not related to personal
injury.
4
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BOILER RATINGS & CAPACITIES
Table 1 - SEA LEVEL RATINGS – NATURAL AND PROPANE GASES
Input
++ Heating Capacity
*(MBH)
Net AHRI Rating
*(MBH)
Shipping
Weight (lbs.)
Model
Flue Diameter
*(MBH)
90-50
90-75
50
75
45
68
90
39
59
78
220
220
220
2” CPVC & PVC
2” CPVC & PVC
2” CPVC & PVC
90-100**
100
* 1 MBH = 1,000 Btuh
Btuh = British Thermal Units Per Hour
** 90-100 model is certified for natural gas only.
++ AFUE (Annual Fuel Utilization Efficiency) and Heating Capacity is based on the D.O.E. (Department of Energy) test
procedure.
Heating Capacity indicates the amount of heat available after subtracting losses up the stack. Most of this heat is available
to heat water. A small portion is heat from jacket and surfaces of the boiler, and it is assumed that this heat stays in the
structure.
Net AHRI rating represents portion of remaining heat that can be applied to heat radiation or terminal units (i.e. finned
tube baseboard, cast iron radiators, radiant floor, etc.). The difference between Heating Capacity and Net AHRI Rating,
called piping and pickup allowance, establishes reserve for heating volume of water in system and offsetting heat losses
from piping.
Net AHRI ratings shown are based on piping and pickup factor of 1.15 in accordance with AHRI Standard as published
by Hydronics Institute. Net AHRI rating of boiler selected should be greater than or equal to the calculated peak heating
load (heat loss) for building or area(s) served by boiler and associated hot water heating systems. Consult manufacturer
before selecting a boiler for installations having unusual piping and pickup requirements.
Boilers are factory equipped for operation at altitudes ranging from 0-5,000 feet above sea level (4,500 feet in Canada).
Boilers for use at high altitude
Canada - Contact Provincial authority having jurisdiction for installations above 4,500 feet (1,350m) above sea level.
United States - See “Boilers For Use At High Altitude” on page 6.
5
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BOILERS FOR USE AT HIGH ALTITUDE - UNITED STATES INSTALLATIONS
• Boilers (with exception of 90-75 propane (LP) product)
are factory equipped for operation at altitudes ranging
from 0-10,000 feet above sea level.
• Instructions on how to adjust gas manifold pressure
settings see Figure 27 and Figure 28, Page 44
.
Note 90-75 propane (LP) applications for 5,000 - 10,000
feet above sea level require orifice change as well as gas
manifold pressure adjustment based upon calorific (Btu)
value of supply gas.
• No changes to factory settings are required for installa-
tions from 0-5,000 feet above sea level.
• For altitudes from 5,000-10,000 feet above sea level
gas manifold pressure needs to be adjusted based upon
calorific (Btu) value of supply gas (contact local gas
utility or distributor for this value).
Refer to Table 2 and Table 3 for high altitude orifice part
number. For replacing orifice refer to specific instructions
included with conversion kit.
• For specific settings refer to Table 2 for natural gas
applications and Table 3, Page 7 for propane (LP) gas
applications.
Table 2 - 90 - 50/75/100 SERIES 2 NATURAL GAS
MODEL 90-50
Stock Factory
Btu Value of Natural Gas++
Settings
0-5,000
50
750
850
950
5,000-10,000
–
1000
1050
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
–
4
–
4
–
–
2.5
3.5
2.5
2.5
43331094
43331094
MODEL 90-75
Stock Factory
Settings
0-5,000
75
Btu Value of Natural Gas++
750
850
950
5,000-10,000
–
1000
1050
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
–
–
–
–
2.5
3.5
3.5
2.5
2.5
2.5
43331092
43331092
MODEL 90-100
Stock Factory
Btu Value of Natural Gas++
Settings
0-5,000
100
750
850
950
5,000-10,000
–
1000
1050
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
–
–
–
–
2.5
3.5
3.5
2.5
2.5
2.5
43331090
43331090
++Contact local gas utility or distributor for Btu value of gas.
6
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BOILERS FOR USE AT HIGH ALTITUDE - UNITED STATES INSTALLATIONS
Model 90-75 propane (LP) units only at altitudes
above 5,000 ft., install 90-75 High Altitude Orifice Kit
#550002629*.
For all other altitudes use sea level orifice
Table 3 - 90 - 50/75 SERIES 2 PROPANE GAS
MODEL 90-50
Stock Factory
Settings
0-5,000
50
Btu Value of Propane Gas++
2300
2350
2400
5,000-10,000
–
2450
2500
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
–
3
–
3
–
–
2.5
2.5
2.5
2.5
43331095
43331095
MODEL 90-75*
Stock Factory
Btu Value of Propane Gas++
Settings
0-5,000
75
2300
2350
2400
5,000-10,000
–
2450
2500
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
–
–
–
3
–
3
2.5
3.5
3.5
3.5
43331093
43331096*
* For model 90-75 Propane units only at altitudes above 5,000 ft., install 90-75 High Altitude Orifice Kit #550002629 For all other
altitudes use sea level orifice.
++Contact local gas utility or distributor for Btu value of gas.
7
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BEFORE INSTALLING THE BOILER
1. Boiler is equipped for residential installations. If used
Boiler Sizing
for commercial applications, any additional code
requirements must be adhered to for installation. This
may require additional controls including but not limited
to a low water cut off, a manual reset high temperature
limit, and wiring and/or piping modifications.
Check to be sure you have selected boiler with proper
capacity before starting installation. AHRI Rating of boiler
selected should be greater than or equal to calculated
peak heating load (heat loss) for building or area(s) served
by boiler and associated hot water heating systems. See
Table 1, Page 5.
2. Before servicing boiler - allow boiler to cool. Shut off
electricity and gas supply connected to boiler prior to
servicing.
Heat loss calculations should be based on approved
industry methods.
3. Inspect gas line for leaks.
4. Verify gas input rate is correct. Over firing may result
in early failure of boiler sections. This may cause
dangerous operation. Under firing may result in too
much air for pre-mix burner causing poor or loss of
combustion.
Boiler Location Considerations
Before selecting boiler location consider following.
• Supplied with correct type of gas (natural gas or
propane).
5. Never vent products of combustion from this boiler to
enclosed space. Always vent to outdoors. Never vent to
another room or to inside building.
• Connected to suitable combustion air intake piping
system to supply correct amounts of fresh (outdoor)
air for combustion, refer to “Combustion Air and Vent
Pipe” on page 22 for details.
6. Be sure there is adequate outdoor air supply to boiler
for complete combustion.
• Connected to a suitable venting system to remove
the hazardous products of gas combustion, refer to
“Combustion Air and Vent Pipe” on page 22 for details.
7. Follow regular service and maintenance schedule for
efficient and safe operation.
8. Keep boiler area clean of debris and free of combustible
• Connected to a suitable hot water heating system.
and flammable materials.
• Supplied with a suitable electrical supply for all boiler
motors and controls.
9. Proper through wall or through roof combustion venting
shall be in accordance with materials and methods
described in this manual. Installation must comply with
local codes.
• Connected to a properly located thermostat or
operating control. Not included with boiler.
• Placed on level surface. DO NOT install on carpeting.
10. Boiler and related hot water heating systems are not do
it yourself items they must be installed and serviced by
qualified professionals.
• Condensate drain line must be pitched down to floor
drain or external condensate pump with reservoir at ¼”
per foot (wood frame or blocks may be used to raise
boiler).
8
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BOILER INSTALLATION
• When vent pipe is exposed to temperatures below
Locating The Boiler
freezing, such as when it passes through an unheated
space or when chimney is used as a raceway, vent pipe
must be insulated with 1/2” Armaflex or equivalent.
In extreme cold climate areas, use ¾” Armaflex or
equivalent.
1. Place crated boiler as close to selected location as
possible and un-crate boiler. Boiler may be moved into
position with appliance dolly or 2 wheel hand truck.
Insert dolly or hand truck under left hand side of
boiler. It is possible to slide boiler for short distance on
smooth floor or surface.
!
WARNING
1. Select level location central to piping systems served
and as close to vent and air intake terminals as
possible.
Solvent cements are combustible. Keep away from
heat, sparks, and open flame. Use only in well ven-
tilated areas. Avoid breathing in vapor or allowing
contact with skin or eyes. Failure these instructions
could result in fire, personal injury, or death.
2. Accessibility clearances, if more stringent (i.e. larger
clearances) than required fire protection clearances,
must be used for boiler installation. Accessibility
clearances may be achieved with the use of removable
walls or partitions.
• Combustion air must be clean outdoor air. Combustion
air must not be taken from inside structure because
that air frequently is contaminated by halogens, which
include fluorides, chlorides, phosphates, bromides and
iodides. These elements are found in aerosols, deter-
gents, bleaches, cleaning solvents, salts, air fresheners,
paints, adhesives and other household products.
3. Boiler is approved for installation in closets and on
combustible floors. This boiler shall NOT be installed on
carpeting.
4. Clearances shown in Table 4 indicate required
clearances. Maintain minimum 1” clearance between
combustible construction and each of left, top and
back surfaces of the boiler. Minimum 11” clearance
is required on right side, to allow room for induced
draft blower. Maintain 18” clearance at side where
passage is required to access another side for cleaning
or servicing, inspection or replacement of parts. Allow
24” at front and left side and 8” at top for servicing. No
clearances are required to venting or combustion air
intake piping.
• Locate combustion air inlet as far away as possible
from swimming pool and swimming pool pump house.
• All combustion air and vent pipes must be airtight and
watertight. Combustion air and vent piping must also
terminate as shown in “Combustion Air and Vent
Pipe” section.
• Vent connections serving appliances vented by
natural draft shall not be connected into any portion
of mechanical draft systems operating under positive
pressure.
5. Install equipment in location which facilitates operation
of venting and combustion air intake piping systems as
described in this manual.
6. Advise owner to keep venting and combustion air
intake passages free of obstructions. Both venting
and combustion air intake piping systems connected
to outdoors must permit flow through piping systems
without restrictions for boiler operation.
Table 4 - Required Clearances
7. Install boiler such that the automatic gas ignition
system components are protected from water
(dripping, spraying, rain, etc.) during operation and
service (circulator replacement, condensate trap,
control replacement, etc.).
Accessibility,
Cleaning, and
Servicing
Combustible
Clearance
Unit
Top
1” (26mm)
1 “ (26mm)
11” (280mm)
1” (26mm)
8” (204mm)
Left Side
Right Side
Base
24” (610mm)
Combustion Air And Vent Pipe Requirements
-
-
This boiler requires a dedicated direct vent system. In a
direct vent system, all air for combustion is taken directly
from outside atmosphere, and all flue products are
discharged to outside atmosphere.
Front
Back
1” (26mm)
1” (26mm)
0 (0)
24” (610mm)
Terminate combustion air and vent pipe connections in
same atmospheric pressure zone, through roof or sidewall
(roof termination preferred). See Figure 12 thru Figure 14,
pages 24 and 25 for required clearances.
-
-
Intake/Vent Piping
Near Boiler Hot
Water Piping
1” (26mm)
-
• Keep boiler area clean of debris and free of flammable
and combustible materials, vapors and liquids.
All distances measured from the cabinet of the boiler.
9
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BOILER INSTALLATION
3. In-so-far as is practical, close all building doors and
Condensate Drain Requirements
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building.
Turn on clothes dryer and any appliance not connected
to the common venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhaust, so
they will operate at maximum speed. Do not operate a
summer exhaust fan. Close fire dampers.
• Pitch condensate drain line down to floor drain at mini-
mum of ¼” per foot. External condensate pump (not
furnished) may be used if floor drain is not available.
• Condensate pump must be designed for flue gas con-
densate application.
• Condensate trap provided with boiler, an additional trap
is not required and should not be used.
4. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat so
appliances will operate continuously.
• Wood frame or blocks may be used to raise boiler
to maintain drain pitch or to be above external
condensate pump reservoir.
5. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle, or the smoke from a cigarette, cigar
or pipe.
Foundation Requirements
• Install boiler on level surface.
6. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fire place dampers,
and any other gas-burning appliance to their previous
condition of use.
!
WARNING
Fire hazard. Do not install boiler on carpeting.
Failure to follow these instructions could result in
death or serious injury.
• Boiler is NOT to be installed on carpeting.
7. Any improper operation of the common venting system
should be corrected so the installation conforms with
the National Fuel Code, NFPA-54/ANSI -Z223.1 and/
or the Natural Gas and Propane Installation Code,
CAN/CSA B149.1.. When re-sizing any portion of the
common venting system, the common venting system
should be re-sized to approach the minimum size as
determined using the appropriate tables in Chapter 13
of the National Fuel Gas Code, NFPA-54/ANSI- Z223.1
and/or the Natural Gas and Propane Installation Code,
• If boiler is not level condensate drain lines will not
function properly. Adjustable feet are located on the
boiler to make up for minor surface irregularities or tilt.
• Wood frame or blocks may be used to raise boiler
to maintain drain pitch or to be above external
condensate pump reservoir.
Removal of Existing Boiler From Common Vent
System
CAN/CSA B149.1.
When an existing boiler is removed from a common
venting system, the common venting system is likely to be
too large for proper venting of the appliances remaining
connected to it. At the time of removal of an existing boiler,
the following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances remaining
connected to the common venting system are not in
operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage, or
restrictions, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
10
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NEAR BOILER PIPING
Clean the System First
Supply And Return Lines
Before connecting boiler to heating system, clean and flush
system thoroughly. Verify system is free of sediment, flux
and any residual boiler water additives.
• Boiler is set up to receive 1 ¼” NPT supply and return
piping from top access.
• Boiler may be piped from left side by turning supply
elbow.
Systems having antifreeze not recommended must be
completely flushed to insure no old antifreeze remains.
In older systems obviously discolored, murky or dirty
water; or pH reading outside acceptable range (between
7.0 and 8.0) are indications the system should be cleaned
or treated. Thoroughly flush system with clean water to
remove any sediment or contaminants. Sludge and iron
oxide deposits can cause rapid breakdown of inhibitors.
• Install furnished dielectric unions at boiler supply and
return lines prior to making system piping connections
• Do Not install copper supply and return piping directly
into aluminum boiler section casings due to galvanic
corrosion between dissimilar metals.
• Must use provided dielectric unions between copper
system piping and boiler to make final connection to
boiler.
Flushing with clean water. If chemical cleaners are used,
use only those recommended for use with aluminum
boilers. Follow chemical cleaner manufacturer’s instructions
completely.
• Furnished circulator pump can be installed at installer
preferred location.
DO NOT mix different manufacturer’s products.
• When boiler installation is for new heating system,
install all of radiation units (panels, radiators,
baseboard, or tubing) and supply and return mains.
• After all heating system piping and components
have been installed, make final connection of system
piping to boiler. A hot water boiler installed above
radiation level, or as required by the Authority having
jurisdiction, must be equipped with low water cut off
device.
• Periodic inspection is necessary for flushing of float
type devices, per low water cut off manufacturers
specific instructions.
11
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NEAR BOILER PIPING
Figure 2 - Single Zone Boiler Piping
12
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NEAR BOILER PIPING
Multi-Zone Systems
Multi-zone systems with two zones are typically piped as
shown in figures 3 or 4. Multi-zone systems with more than
two zones are likely to have small zones with very low heat
and flow requirements compared to full heating capacity of
the boiler. This can result in very low flow in the boiler if
only one small zone is calling for heat.
Primary Secondary Piping is recommended for multi-zone
systems with more than two zones to insure proper water
flow through the boiler at all times. See figures 5, 6 and 7
for typical primary secondary piping configurations.
Figure 3 - Two Zone Boiler Piping With Zone Valves
13
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NEAR BOILER PIPING
Figure 4 - Two Zone Boiler Piping With Circulators
14
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NEAR BOILER PIPING
Figure 5 - Primary/Secondary Piping And Wiring With Circulators And Domestic Hot
Water
15
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NEAR BOILER PIPING
Figure 6 - Piping and Wiring Primary/Secondary Multi Zone System Piping With Zone
Valves And Domestic Hot Water (With Zone Valve)
16
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NEAR BOILER PIPING
Figure 7 - Piping And Wiring Primary/Secondary Piping With Zone Valves And Domestic
Hot Water (With Circulator)
17
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NEAR BOILER PIPING
!
WARNING
Figure 8 - Relief Valve Boiler Piping
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
RELIEF VALVE
DISCHARGE
LINE
Safety Relief Valve
Installation of safety relief valve shall conform to ANSI/
ASME Boiler and Pressure Vessel Code, Section IV.
• Install furnished safety relief valve using 3/4” x 4½”
pipe provided with boiler. See Figure 8.
• Install safety relief valve with spindle in vertical
position.
• Do not install shutoff valve between boiler and safety
relief valve.
• Install discharge piping from safety relief valve. See
Figure 8.
• Use ¾” or larger pipe.
• Use pipe suitable for temperatures of 375°F (191°C) or
greater.
Check local
codes for
maximum
distance
from floor
or allowable
safe point of
discharge.
• Individual boiler discharge piping shall be independent
of other discharge piping.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Run pipe as short and straight as possible to location
protecting user from scalding and properly drain piping.
• Install union, if used, close to safety relief valve outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
Expansion Tank And Make-Up Water
Determine required system fill pressure, system design
temperature, and system water content.
• Boiler contains 2.6 gallons (U.S.). Size expansion tank
accordingly. Consult expansion tank manufacturer for
proper sizing information.
• Connect properly sized expansion tank (not furnished).
Diaphragm type expansion tank see Figure 9, Page 19.
See Figure 10, Page 20 for conventional closed type
expansion tanks.
• For diaphragm type expansion tanks, adjust tank
air pressure to match system fill pressure. Install
furnished air vents shown for diaphragm type
expansion tank system only.
• Install make-up water connections as shown per local
codes.
• If pressure reducing valve is used, adjust to match
system fill pressure.
• Verify clean water supply is available. When water
supply is from well or pump, install sand strainer at
pump
18
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NEAR BOILER PIPING
Figure 9 - Diaphragm Type Expansion Tank Piping
19
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NEAR BOILER PIPING
Figure 10 - Conventional (Closed Type) Expansion Tank Piping
20
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NEAR BOILER PIPING
Condensate Drain Piping
Filling Condensate Trap With Water
Boiler is factory equipped with a condensate trap. An
additional trap is not required and should NOT be used.
On initial start up condensate trap must be manually filled
with water.
1. Provide ½” PVC condensate drain and fittings.
Condensate drain to be pitched down to floor drain at a
minimum of ¼” per foot.
Following are the steps required to initially fill condensate
trap for start up. Steps are only required at initial start up
or if maintenance requires draining of condensate trap.
2. Install ½” PVC tee to overflow fitting as shown in
1. Disconnect vent condensate drain line from vent pipe
Figure 11.
connector on outlet of induced draft blower.
3. The ½” diameter schedule 40 PVC or CPVC condensate
drain and pipe fittings must conform to ANSI standards
and ASTM D 1785 or D2846.
2. Pour about 1 cup of cold tap water into vent drain line
with funnel.
3. Excess water should go through overflow and out
through condensate drain line. Verify proper operation
of drain line (or external condensate pump if used).
4. Schedule 40 PVC or CPVC cement and primer must
conform to ASTM D2564 or F493.
5. In Canada, use CSA or ULC certified schedule 40 PVC
4. Reinstall vent drain line.
or CPVC drain pipe cement.
6. Condensate pump with reservoir (not furnished) may
be used to remove condensate to a drain line (sanitary
line) above boiler if floor drain is not available or is not
accessible.
Chilled Water Piping
Install boiler, when used in connection with refrigeration
system, so chilled medium is piped in parallel with boiler
with appropriate valves to prevent chilled medium from
entering boiler.
Boiler piping system of hot water boiler connected to
heating coils located in air handling units where they may
be exposed to refrigerated air circulation must be equipped
with flow control valves or other automatic means to
prevent gravity circulation of the boiler water during cooling
cycle.
Figure 11 - Condensate Drain Piping
FROM BLOWER
PITCH DRAIN PIPE
DOWN TO FLOOR
DRAIN AT MINIMUM
1/4” PER FOOT
TO DRAIN
OPEN
1/2” PVC
PVC TEE 1/2”SLIP X
CONDENSATE
1/2” SLIP X 1/2” SLIP
DRAIN
21
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COMBUSTION AIR AND VENT PIPE
Connections And Termination
6. Combustion air and vent piping lengths. Table 5,
Page 23. First 5 ft. of vent piping run must be 2”
CPVC:
Provisions for combustion and ventilation air must be
in accordance with section, Air For Combustion and
Ventilation, of the National Fuel Gas Code,ANSI 2223.1/
NFPA54, or Sections 8.2, 8.3 or 8.4 of National Gas and
Propane Installation Code, CAN/CGA-B 149.1, or applicable
provisions of the local building code.
Length of pipe is counted from boiler jacket (air
intake pipe) or from vent pipe connector(vent pipe).
Termination is not counted toward the “Total Equivalent
Length”.
Boilers require dedicated direct vent system. All air for
combustion is taken directly from outdoors through
combustion air intake pipe. All flue products are discharged
to outdoors through vent pipe.
For elbows, reduce maximum vent length as shown:
• 2” 90° elbow -1 ½ ft. per elbow.
• 3” 90° elbow - 3 ft. per elbow.
1. See Figure 12 thru Figure 14, Pages 24 and 25
for combustion air and vent pipe roof and sidewall
termination. Roof termination is preferred. Combustion
air and vent pipes must terminate together in same
atmospheric pressure zone as shown.
Example:
To add two (2) 90° elbows to a 3” pipe for a 75 boiler.
Each elbow is 3 ft. per 90 ° elbow for a total of 6 ft..
2. Construction through which vent and air intake pipes
may be installed is maximum 24 inches, minimum ¼”
thickness.
(1 elbow @ 3 ft. + 1 elbow @ 3 ft. = 6 equivalent ft. of
pipe)
3. Combustion air and vent pipe fittings must conform
to American National Standards Institute (ANSI)
standards and American Society for Testing and
Materials (ASTM) standards D1784 (schedule-40
CPVC), D1785 (schedule-40 PVC), D2665 (PVC-DWV),
D2241 (SDR-21 and SDR-26 PVC), D2661 (ABS-DWV),
or F628 (schedule-40 ABS). Pipe cement and primer
must conform to ASTM standards D2564 (PVC) or
D2235 (ABS).
Total additional pipe is then subtracted from maximum
allowable pipe length to give new maximum length of
106 ft. with two (2), 90° elbows.
“TOTAL EQUIVALENT LENGTH”:
Original 112 ft. max. - 6 equivalent ft. for 2 elbows =
new 106 ft. maximum length.
4. Canada construct all combustion air and vent pipes
for this unit of ULC S636 listed schedule-40 CPVC,
schedule-40 PVC, PVC-DWV or ABS-DWV pipe and pipe
cement. SDR pipe is not approved in Canada.
• First 3 feet (900mm) of venting must be readily
available for visual inspection.
7. Pitch combustion air and vent piping back to boiler at
minimum ¼” per ft. (21 mm/m) from intake and vent
terminals so all moisture in combustion air and vent
piping drains to boiler. Pitch pipes continuously with no
sags or low spots where moisture can accumulate and
block flow of air or flue gas. Combustion air and vent
pipes must be airtight and watertight.
• Specified primers and glues of certified vent
system must be from single manufacturer, and not
intermixed with other manufacturer’s vent system
parts.
• Components of the certified system must not be
interchanged with other vent systems, or unlisted
pipe and/or fittings.
8. Consider following when determining appropriate
location for termination of combustion air and vent
piping.
• Position termination where vent vapors will not damage
plants/shrubs or air conditioning equipment.
• Position termination as to not be effected by wind eddy,
air born leaves, snow, or recirculated flue gases.
NOTICE
Transition from 2” pipe to 3” pipe must be made in
vertical run.
• Position termination where it will not be subjected to
potential damage by foreign objects, such as stones,
balls, etc..
5. Boiler combustion air and vent piping connections are
sized for 2” pipe. Any pipe size change (to 3”) must be
made outside of boiler casing in vertical run of pipe to
allow for proper drainage of vent condensate. Due to
potential for flue gas temperatures over 155°F, first
five (5) feet of vent pipe must be CPVC, the remain-
ing vent pipe can be PVC. If any elbows are employed
within the first 5 feet of vent, they must be CPVC too.
Two (2) - 30” pieces of 2” CPVC pipe. 2½” piece of 2”
CPVC pipe, a 2” CPVC elbow and 2” CPVC pipe coupling
are furnished with the boiler.
• Position termination should where vent vapors are not
objectionable.
• Place vent on wall away from prevailing wind. Locate or
guard vent to prevent accidental contact with people or
pets.
• Terminate vent above normal snowline. Avoid locations
where snow may drift and block vent. Ice or snow may
cause boiler to shut down if vent becomes obstructed.
22
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COMBUSTION AIR AND VENT PIPE
Table 5 - Combustion Air And Vent Piping Lengths - Total Equivalent Length
BOILER
SIZE
2” PIPE MINIMUM
VENTING
2” PIPE MAXIMUM
VENTING
3” PIPE MINIMUM
VENTING
3” PIPE MAXIMUM
VENTING
100
2 FEET
2 FEET
21 FEET
26 FEET
15 FEET
20 FEET
92 FEET
75 & 50
112 FEET
• Under certain conditions, flue gas will condense,
forming moisture, and may be corrosive. Take steps to
prevent building materials at vent from being damaged
by exhaust of flue gas.
• Vent shall not terminate underneath veranda, porch or
deck unless,
(a) veranda, porch or deck is fully open on minimum of
two sides beneath floor, and
• Vent shall not terminate where it may cause hazardous
frost or ice accumulations on adjacent property
surfaces.
(b) distance between top of vent termination and
underside of veranda, porch or deck is greater than 1
ft. (300mm).
9. Venting system shall terminate at least 3 ft. (0.9m)
above any forced air inlet (except boiler’s combustion
air inlet) within 10 ft.(3m).
See figures 12 and 13 and 14 for two pipe terminations.
See figures 15, 16 and 17 for concentric vent terminations.
• Venting system shall terminate at least 12 in. from any
air opening into any building.
Installation
1. Attach combustion air intake piping using field supplied
2” flexible coupling. Attach vent piping to furnished 2”
vent pipe connector on draft inducer outlet.
• Vent bottom shall be located at least 12 in. above
grade.
• Termination of the vent shall be not less than 7 ft.
(2.1m) above adjacent public walkway or paved
driveway.
2. All pipe joints are to be water tight
3. Working from boiler to outside, cut pipe to required
length(s).
• Vent terminal shall not be installed closer than 3 ft.
from inside corner of L shaped structure.
4. Deburr inside and outside of pipe.
5. Chamfer outside edge of pipe for better distribution of
• Vent termination should be kept at least 3 ft. away
from vegetation.
primer and cement.
6. Clean and dry all surfaces to be joined.
7. Check dry fit of pipe and mark insertion depth on pipe.
• USA only. Venting system shall terminate at least 4
ft. horizontally from, and in no case above or below,
unless 4 ft. (1.22m) horizontal distance is maintained,
from electric meters, gas meters, regulators, and relief
equipment.
8. After pipes have been cut and pre-assembled, apply
cement primer to pipe fitting socket and end of pipe to
insertion mark. Quickly apply approved cement to end
of pipe and fitting socket (over primer). Apply cement
in light, uniform coat on inside of socket to prevent
buildup of excess cement. Apply second coat.
• Canada only. Venting system shall terminate at
least 6 ft. (1.83m) horizontally from, in no case above
or below, unless a 6 ft. (1.83m) horizontal distance
is maintained, from electric meters, gas meters,
regulators, and relief equipment.
9. While cement is still wet, insert pipe into socket with
¼ turn twist. Be sure pipe is fully inserted into fitting
socket.
• Vent shall not terminate within 6 ft. (1.8m) of
mechanical air-supply inlet to any building.
10. Wipe excess cement from joint. Continuous bead of
cement will be visible around perimeter of properly
made joint.
• Vent shall not terminate above regulator within 3
ft. (900 mm) horizontally of vertical center line of
regulator vent outlet to maximum vertical distance of
15 ft. (9.5m).
11. Handle pipe joint carefully until cement sets.
12. Support combustion air and vent piping minimum of
every 5 feet using pre-formed metal hanging straps.
Do not rigidly support pipes. Allow movement due to
expansion and contraction.
• Vent shall not terminate within 3 ft. (900mm) of
window or door that can be opened in any building, or
any non-mechanical air-supply inlet to any building, or
of combustion air inlet of any other appliance.
13. Slope horizontal portion of combustion air and vent
pipes toward boiler minimum of ¼” per linear ft.
(21mm/m) with no sags between hangers.
14. Use appropriate methods to seal openings where vent
and combustion air pipes pass through roof or side
wall.
23
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COMBUSTION AIR AND VENT PIPE
Figure 12 - Roof Vent / Intake Terminations
VENT
AIR INTAKE
24
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COMBUSTION AIR AND VENT PIPE
Figure 13 - Side Wall Vent / Intake terminations - Less Than 12” Clearance Above Grade
Less Than 12” Clearance
Figure 14 - Side Wall Vent/Intake Terminations - 12” Or More Clearance Above Grade
12” Or More Clearance
25
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COMBUSTION AIR AND VENT PIPE
Figure 17 - Concentric Vent Roof
Figure 15 - Concentric Vent Terminations
Installation
1" (2.54cm)
Maximum
VENT
NOTE:
SUPPORT MUST BE
FIELD INSTALLED TO
SECURE TERMINATION
KIT TO STRUCTURE.
D
COMBUSTION AIR
A
Vent
Combustion
C
Air
1" (2.54cm)
Overhang
ROOF BOOT/FLASHING
Maximum
A
(FIELD SUPPLIED)
B
ELBOW
(FIELD SUPPLIED)
SUPPORT
(FIELD SUPPLIED)
12" (30cm) Minimum
B
C
* See Note
36"(0.9m) Minimum
Below
MAINTANIN 12 IN.
(18IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
COM
AIR
VENT
D
Maintain 12"(30cm)
Vent
clearance above highest
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF
anticipated snow level or
Combustion
Air
grade
*Must be less than 4" or greater than 24" Horizontal dis-
tance between end bells of each air intake to prevent flue
gas recirculation.
Figure 16 - Concentric Vent
STRAP
A
(FIELD SUPPLIED)
ELBOW
(FIELD SUPPLIED)
B
B
C
COMBUSTION
AIR
1” MAXIMUM
VENT
VENT
C
COMBUSTION AIR
A
NOTE:
SECURING STRAP MUST BE FIELD INSTALLED TO
PREVENT MOVEMENT OF TERMINATION KIT IN SIDE
WALL.
26
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COMBUSTION AIR AND VENT PIPE
Figure 18 - Combustion Air and Vent Piping - Boiler Connections
2” (50.8mm) DIAMETER VENT AND
COMBUSTION AIR INTAKE PIPING
- 21 feet maximum total equivalent
length for 90-100 models
-26 feet maximum total equivalent
length for 90-50 and -90-75 models
- 2 feet minimum total equivalent
length for all models
TRANSITION FITTING
2” (50.8mm) ⊘ to 3” (76.2mm)
⊘ IN VERTICAL RUN
3” (76.2mm) DIAMETER VENT AND
COMBUSTION AIR INTAKE PIPING
- 92 feet maximum total equivalent length
for 90-100 models
- 15 feet minimum total equivalent length
for 90-100 models
- 112 feet maximum total equivalent length
for 90-50 and 90-75 models
- 20 feet minimum total equivalent length
for 90-50 and 90-75 models
27
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GAS SUPPLY PIPING
!
CAUTION
!
DANGER
WHAT TO DO IF YOU SMELL GAS
Fire Hazard. Do not use matches, candles, open
flames, or other methods providing ignition source.
Failure to comply will result in death or serious
injury.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow gas supplier’s
instructions.
Leak Check Gas Piping
Pressure test boiler and gas connection before placing
boiler in operation.
• If you cannot reach your gas supplier, call the fire
department.
•
Disconnect boiler and its individual gas shutoff
valve from gas supply system.
•
Isolate boiler from gas supply system by closing
manual gas shutoff valve. See Figure 19,
Page 29.
Check Gas Supply
Gas pipe to your boiler must be correct size for length of
run and for total Btu per hour input of all gas utilization
equipment connected to it. See Table 7, Page 29.
•
•
Locate leakage using gas detector, noncorrosive
detection fluid, or other leak detection method
acceptable to authority having jurisdiction. Do
not use matches, candles, open flames, or other
methods providing ignition source.
Boiler and its individual shutoff valve must be disconnected
from gas supply piping system during any system pressure
testing at test pressures in excess of ½ psig (3.5kpa).
Boiler must be isolated from gas supply piping system
by closing its individual manual shutoff valve during
any pressure testing of gas supply piping system at test
pressures equal to or less than ½ psig (3.50ka).
Correct leaks immediately and retest.
Table 6 - Gas Supply Pressure
NATURAL PROPANE
Connecting The Gas Piping
See Figure 19, Page 29 for general layout at boiler.
Gas line enters boiler from right side jacket panel.
GAS
GAS
Boiler is equipped with ½” NPT connection on gas valve for
supply piping.
MAXIMUM GAS
SUPPLY PRESSURE
10” w.c.
14” w.c.
Following rules apply:
MINIMUM GAS SUPPLY
PRESSURE
4” w.c.
10” w.c.
1. Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements:
• USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
2. Size and install gas piping system to provide sufficient
gas supply to meet maximum input at not less than
minimum supply pressure. See Table 7, Page 29
3. Use ground joint unions.
4. Provide sediment trap up stream of gas valve.
5. Use two pipe wrenches when making the connection to
gas valve to keep it from turning.
6. Install a manual shutoff valve in the vertical pipe about
5 feet above floor.
7. Tighten all joints securely.
8. Propane gas connections should only be made by
licensed propane installer.
9. Two stage regulation should be used by propane
installer.
10. Propane gas piping should be checked out by propane
installer.
28
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GAS SUPPLY PIPING
Table 7 – Gas Pipe Sizes
NATURAL GAS
Pipe Capacity - BTU Per Hour Input Includes Fittings
Length of
Pipe - Ft.
1/2”
3/4”
1”
1 1/4”
625,000
445,000
365,000
20
40
60
92,000
63,000
50,000
190,000
350,000
245,000
195,000
130,000
105,000
PROPANE GAS
Pipe Capacity - BTU Per Hour Input Includes Fittings
Length of
Pipe - Ft.
Copper Tubing*
Iron Pipe
5/8”
3/4”
216,000
1/2”
3/4”
20
40
60
131,000
90,000
72,000
189,000
129,000
103,000
393,000
267,000
217,000
145,000
121,000
* Outside diameter
Figure 19 - Gas Piping
29
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ELECTRICAL WIRING
Connect Circulator Pump Wiring
!
WARNING
See Figure 20, Page 31 for circulator pump field wiring con-
nections.
Electrical shock hazard. Turn OFF electrical power
supply at service panel before making electrical
connections. Failure to do so could result in death
or serious injury.
Supplied 5 foot wiring harness with flexible metal conduit
for connection from circulator pump to junction box.
If two 120 Volt circulator wire terminals inside junction box
are not used, leave two wire nuts to prevent short circuit.
Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction. Refer to:
NOTICE
• USA- National Electrical Code, ANSI/NFPA 70.
• Canada - Canadian Electrical Code, Part I, CSA C22.1:
Safety Standard for Electrical Installations.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
Electric Power Supply
Prior to making any line Voltage connections, turn OFf
electrical power at fuse box.
Things to Avoid when Locating Thermostats
1. Run separate 115 Volt circuit from separate over
current protection device in electrical service entrance
panel. This should be 15 ampere circuit.
DEAD SPOTS:
Corners and alcoves
Behind doors
HOT SPOTS:
Concealed pipes
Fireplace
COLD SPOTS:
2. See Figure 20, Page 31 for diagram showing service
switch junction box and power supply connection
points.
Concealed pipes or ducts
Stairwells - drafts
3. Locate service switch in vicinity of boiler. Verify it is
TV sets
turned OFF during service or maintenance.
Radios
• Connect black (hot) lead from power supply to black
wire labeled L 120 VAC.
Lamps
Unheated rooms on
other side of wall
Direct sunlight
Kitchens
• Connect white (neutral) lead from power supply to
white wire labeled N 120 VAC.
• Connect green (ground) lead from power supply to
green wire labeled G 120 VAC.
4. Run 14 gauge or heavier copper wire from boiler to
grounded connection in service panel or properly driven
and electrically grounded ground rod.
Thermostat Installation
• Thermostat location has important effect on operation
of boiler system.
• Follow instructions included with your thermostat.
• Locate thermostat about five feet above floor on inside
wall.
• Mount directly on wall or on vertical mounted outlet
box.
• It should be sensing average room temperature.
Set heat anticipator (where applicable) at 0.7 amps.
Connect 24 Volt thermostat leads to two(2) yellow wires
located in junction box, located on outer jacket of boiler.
See Figure 20, Page 31 for junction box and thermostat
field wiring connections.
30
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ELECTRICAL WIRING
Figure 20 - Wiring Schematic
NOTICE
If any of original wire as supplied with this appliance
must be replaced, it must be replaced with type
105°C Thermoplastic wire or its equivalent
31
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ELECTRICAL WIRING
Figure 21 - Ladder Wiring Diagram
32
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ELECTRICAL WIRING
Figure 22 - Suggested Wiring Schematic for Domestic Hot Water Priority Two Zone
System with Circulators Using Argo AR822II Pump Relay
33
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ELECTRICAL WIRING
Figure 23 - Ladder Diagram for Figure 22
34
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CONTROLS AND ACCESSORIES
• Boiler temperature is cooling at a rate greater than
5°F/minute while circulator is running.
This section provides a brief description of the key controls
and accessories found in this boiler.
See Figure 26, Page 41 for detailed sequence of operation.
See the Repair Parts Manual for locations of all control
components and accessories described.
4. For Installations using Indirect Hot Water Heater
Depending on the specific installation, thermal purge
delay might or might not affect end user’s expectation for
domestic hot water delivery. In event the customer has a
concern that it takes too long for hot water, the situation
may be resolved in three ways.
Integrated Boiler Control (IBC)
Integrated Boiler Control (IBC) is a microprocessor based
controller for high efficiency gas boiler that monitors
all safety controls and which controls operation of the
combustion air blower, circulator pump, burner, and
a combination direct spark igniter/flame sensor. This
controller is not intended for use with a vent damper.
Controller is mounted on control panel inside of boiler and
contains a three character user interface display.
A. Add a Domestic Hot Water Module, ECR part
Number 240009562 (Honeywell part number
W8375s1008). This control senses when hot water
is being drawn, and instructs the integrated boiler
control to bypass the thermal purge operation until
domestic how water draw ends. Thermal purge will
then be re-enabled.
DHW module incorporates a temperature sensor
installed at the indirect water heater’s hot water
supply fitting ( Note - this sensor is in addition to,
not in place of, the limit control on the hot water
tank.) The Module is connected to the Enviracom
terminals in the Integrated Boiler Control.
High Limit Control
High Limit Control determines maximum boiler water
temperature and also provides means for protecting boiler
and heating system from unsafe operating conditions which
could damage boiler.
B. Thermal purge parameters may be adjusted (higher
thermal purge temperature limit and/or shorter
thermal purge time delay) to bring the burner on
sooner.
Limit control sensor is mounted in ¾” NPT control well on
top of the front boiler section at hot water outlet.
Limit control is incorporated in IBC and is field adjustable
between 80°F and 190°F.
Field setpoint adjustment for each installation depends on
heating system requirements.
C. Thermal purge function can be disabled.
Limit Control automatically resets when boiler water
temperature decreases (10-30°F adjustable differential).
Differential can be adjusted to provide flexibility for boiler
Gas Control Valve
Electrically controlled Combination Gas Control Valve is
designed to meet requirements for use with direct ignition
systems found in this boiler. Valve is piped to gas/air mixer.
operation. Larger the differential, longer run cycle of boiler.
Thermal Purge Operation
Direct Spark Igniter
1. Thermal purge feature complies with 2012 DOE
and NRCan requirements that boiler control must
incorporate automatic means to adjust water
temperature.
2. Intent of thermal purge is to insure usable residual
heat in the boiler is circulated until it is sufficiently
depleted from the system before the burner is allowed
to fire. To that end, on call for heat, burner is held
off while circulator runs until boiler temperature drops
to thermal purge temperature limit or time delay is
exceeded. Both of these parameters are adjustable.
Direct spark igniter utilizes a spark gap to initiate gas
combustion in the burner. Igniter is mounted next to burner
through gas/air mixer. The igniter also serves as means for
proving main burner flame by flame rectification. In the
event of a lack of flame signal on three (3) consecutive tri-
als for ignition, IBC will lockout and display Error Code 62.
Draft Inducer Temperature Safety Switch
Draft Inducer Temperature Safety Switch is a disc
thermostat (180 °F setpoint) located on induced draft fan
outlet port. Switch protects inducer and vent pipe from
potential high temperature condition for discharging flue
gases. Condition would typically be result of higher high
limit control setting or over firing. Temperature safety
switch automatically resets when the vent temperature
decreases. (15 °F switch differential).
3. When boiler temperature falls below thermal purge
temperature limit or time delay expires, burner is
allowed to fire.
In addition to thermal purge temperature and thermal
purge time delay parameters, two other conditions release
integrated boiler controller from thermal purge and allow
burner to run in order to maintain comfort in the space.
• Boiler temperature has dropped 10°F from boiler water
temperature measured at beginning of the call for heat.
35
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CONTROLS AND ACCESSORIES
Casting Temperature Safety Switch
Drain Valve
In event of lack of or loss of water in boiler, Casting
Temperature Safety Switch (300 °F setpoint) installed
on top of the aluminum boiler section shuts off boiler by
shutting off power to Integrated Boiler Control (IBC). This
fault requires manual reset of casting temperature safety
switch to restart the boiler. Verify that boiler is properly
filled with water before resetting this switch.
Manual drain valve provides means of draining water in
heating system, including boiler and hot water supply and
return piping systems installed above drain valve. This
drain valve is installed in ¾” tapping at bottom of front
boiler section. Any piping installed below elevation of
this drain valve will require additional drain valves to be
installed at low points in piping systems in order to drain
entire system.
Never run cold water into a hot empty boiler.
A.S.M.E. Rated Pressure Relief Valve
Differential Pressure Air Proving Switch/Blocked
Vent Safety Shutoff
Each boiler must have a properly sized and installed
American Society of Mechanical Engineers rated pressure
relief valve. Water expands as it is heated by burner/
boiler sections. If there is no place for water to expand
its volume, (i.e. a properly sized and properly functioning
expansion tank) pressure on inside of boiler and heating
system will increase. Furnished relief valve automatically
opens at 30 psig pressure to relieve strain on boiler and
heating system from increasing pressure. Pressure relief
valve discharge must be piped with piping same size as
valve discharge opening to open drain, tub or sink, or
other suitable drainage point not subject to freezing, in
accordance with A.S.M.E. specifications and requirements
of local jurisdiction.
Differential pressure switch monitors air flow by sensing
differential pressure measured in inches of water (” w.c.).
Pressure switch contacts close when draft inducer is
running. Closed switch indicates there is adequate air flow
for combustion. Pressure switch shuts off main burner if
differential pressure is inadequate due to blocked vent pipe,
blocked air intake, blocked boiler sections, or blocked draft
inducer. If pressure switch contacts fail to close control will
display Error Code 29.
Draft Inducer
Draft inducer (blower) provides means for pulling
combustion air into and through the mixer, burner, flue
ways of cast aluminum boiler sections and flue adapter
before being discharged through vent piping to outdoors.
See applicable sections for proper sizing and installation of
combustion air and vent piping in this manual.
External Condensate Pump (Optional)
For installations where there is no floor drain or other
appropriate drainage receptacle available to receive
condensate from the boiler, an external float activated
condensate pump with integral sump is required. This unit
can be installed to pump the condensate to a remote tie in
point to a sanitary sewer system. For this application, the
boiler must be installed so that proper pitch of piping to the
external condensate reservoir (sump) can be accomplished.
Use wood frame or blocks to raise boiler as required for
proper installation.
Circulator Pump
Every forced hot water system requires at least one
circulating pump.
Circulating pump imparts the necessary energy to move
water through closed loop supply and return piping
systems, terminal heating equipment (i.e. finned tube
radiators, etc.) and back through boiler for reheating.
To provide required hot water flow rates, circulator pump
must be properly sized to overcome frictional losses
(usually measured in feet of water, also referred to as
“pump head loss”) of supply and return piping systems and
boiler.
The circulator pump is furnished for single zone or zone
valve controlled heating system and should be located on
downstream (i.e., pumping away) side of expansion tank.
For pump controlled system (where there is a circulator for
each zone) circulator provided with boiler can work for one
zone. For more details on piping and circulators, see “Near
Boiler Piping” on page 11.
36
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START UP
Purging Air For Systems With Conventional
Water Quality, Water Treatment and Freeze
Protection - see Appendix A
Closed Type Expansion Tanks:
Refer to the appropriate diagrams“Near Boiler Piping” on
page 11 for more information.
Filling Boiler With Water And Purging Air For
Systems With Diaphragm Type Expansion Tanks
Refer to the appropriate diagrams,“Near Boiler Piping” on
page 11 for more information.
1. Close all zone service valves on the supply and return
piping. Open the feed valve and fill boiler with water.
Make sure air vent is open. Hold relief valve open until
water runs air free for five seconds to rapidly bleed air
from boiler, then let the relief valve snap shut.
2. Open the zone service valve on the supply pipe for the
first zone. Open the purge valve on the first zone. Feed
water will fill the zone, pushing air out the purge valve.
Close the purge valve when the water runs air free.
Close the zone service valve.
1. Close all zone service valves on the supply and return
piping and close the expansion tank service valve.
Drain expansion tank. Open the feed valve and fill
boiler with water. Hold relief valve open until water
runs air free for five seconds to rapidly bleed air from
boiler, then let the relief valve snap shut.
2. Open the zone service valve on the supply pipe for the
first zone. Open the purge valve on the first zone. Feed
water will fill the zone, pushing air out the purge valve.
Close the purge valve when the water runs air free.
Close the zone service valve.
3. Repeat step 2 for all remaining zones.
4. Open the expansion tank service valve and the tank
vent. Fill the tank to the proper level and close the
tank vent. Remove the handle from the expansion tank
service valve so the homeowner doesn’t accidentally
close it.
5. Open all service valves. Any air remaining trapped in
the return lines between the service valves and the
boiler will be pushed towards the expansion tank when
the boiler is placed in operation.
3. Repeat step 2 for all remaining zones.
4. Open all service valves. Any air remaining trapped in
the return lines between the service valves and the
boiler will be pushed towards the air vent when the
boiler is placed in operation.
5. Inspect piping system. Repair any leaks immediately.
6. Inspect piping system. Repair any leaks immediately.
37
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OPERATING INSTRUCTIONS
WARNING
!
!
CAUTION
If you do not follow these instructions
exactly, a fire or explosion may result causing
property damage, personal injury or loss of
life.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• This appliance is equipped with an ignition device
which automatically lights burner. Do NOT try to
light this burner by hand.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• Before operating smell all around appliance area
for gas. Be sure to smell next to floor because
some gas is heavier than air and will settle to the
floor.
• If you cannot reach your gas supplier, call the fire
department.
•Use only your hand to turn the gas shutoff
valve. Never use tools. If valve will not turn
by hand, do not try to repair it, call a qualified
service technician. Force or attempted repair may
result in fire or explosion.
To Turn Off Gas To Appliance
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is
to be preformed.
3. Remove the front jacket panel.
•Do not use this appliance if any part has
been under water. Immediately call a qualified
service technician to inspect appliance and to
replace any part of control system and any gas
control which has been under water.
4. Turn gas control knob clockwise
5. Replace the front jacket panel.
to “OFF”.
Stop! Read Safety information above.
1. Set thermostat to lowest setting.
2. Turn off all electric power to the appliance.
3. This appliance is equipped with an ignition device which
automatically lights the burner. DO NOT try to light the
burner by hand.
Figure 24 - Gas Valve
4. Remove the front jacket panel.
5. Turn the gas control knob clockwise
to “OFF”.
6. Wait five (5) minutes to clear out any gas. Then smell
for gas, including near the floor. If you smell gas,
STOP! Follow “B” in the safety information above on
this label. If you don’t smell gas go on to next step.
ON
INLET
7. Turn the gas control knob counterclockwise
to
“ON”.
OFF
8. Replace front jacket panel.
9. Turn on all electrical power to the appliance.
10. Set the thermostat to desired setting.
GAS CONTROL KNOB
SHOWN IN "ON" POSITION
11. If the appliance will not operate, follow the instructions
“To Turn Off Gas To Appliance” and call your service
technician or gas supplier.
38
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S9381A INTEGRATED BOILER CONTROL OPERATION AND ADJUSTMENTS
S9381A control has a number of user adjustable
parameters as shown in Table 8.
Table 8 - User Parameters
Adjusting Settings
Figure 25 - Display
To discourage unauthorized changing of settings, a
procedure to enter the adjustment mode is required.
To enter the adjustment mode, press the UP, DOWN,
and I buttons simultaneously for three seconds. Press
and release the I button until the parameter requiring
adjustment is displayed.
Then press the UP or DOWN button until the parameter has
reached the desired value. After 60 seconds without any
button inputs, the control will automatically return to the
READ mode.
Display
In RUN mode, status items and parameters are viewable.
To read settings, press and release the I Key to find the
parameter of interest. For example, press and release
I until setpoint (sp) is displayed, followed by a three-
digit number, i.e., 220, followed by °F or °C. See Display
Readout, Figure 25.
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S9381A INTEGRATED BOILER CONTROL OPERATION AND ADJUSTMENTS
Table 9 - State Code Definitions
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S9381A INTEGRATED BOILER CONTROL OPERATION AND ADJUSTMENTS
Figure 26 - Sequence of Operation
41
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CHECK OUT PROCEDURE AND ADJUSTMENT
Verify Proper Sequence Of Operation
Test Other Safety Controls
Place boiler into operation and observe operation through
several cycles. Follow remaining steps in this section to
insure boiler is operating correctly.
If boiler is equipped with low water cut off, manual reset
high limit, or additional safety controls, test for operation
as outlined by control manufacturer. Burner should be
operating and should go off when controls are tested. When
safety controls are restored, burner should reignite.
First couple of cold starts may be rough due to gas line not
being completely purged of air, causing low firing rate and
high excess air levels.
Set Thermostat Heat Anticipator (If Used) And
Verify Thermostat Operation
Inspect Venting And Air Intake System
Operate boiler and verify all vent/air intake connections are
gas-tight and watertight. Repair any leaks immediately.
For single thermostat connected to yellow thermostat lead
wires in furnished field wiring junction box, heat anticipator
should be set at 0.7 amps. For other wiring configurations,
refer to instructions provided by thermostat manufacturer
regarding adjustment of heat anticipator. Cycle boiler
with thermostat. Raise thermostat to highest setting and
verify boiler goes through normal start up cycle. Lower
thermostat to lowest setting and verify boiler goes off.
Inspect Condensate Drain
Verify all connections are watertight, and that condensate
flows freely. Repair any leaks immediately.
Inspect System Piping
Verify all connections are watertight. Repair any leaks
immediately.
Measure Natural Gas Input Rate
Correct input rate is essential for proper and efficient
operation of the burner and boiler.
1. Determine elevation at installation site.
Test Ignition System Safety Shutoff Device
1. Turn off manual gas valve
2. Table 1 and Table 2, Page 6 to determine correct input
rate for the local elevation.
3. Obtain yearly average heating value of local gas supply
from gas utility. At sea level elevation, it should be
approximately 1000 Btu’s per standard cubic foot.
2. Set thermostat to call for heat
3. Boiler begins normal sequence of operation
4. After approximately 20 seconds (pre purge, state code
4. Operate boiler for 5 minutes.
4) gas valve is powered (state code 6).
5. Turn off all other gas appliances, extinguishing standing
5. After 13 second trial for ignition, gas valve closes,
(state code 10)as integrated boiler control senses that
flame is not present.
pilots where applicable.
6. At gas meter, measure time in seconds required to use
one cubic foot of gas.
6. After about 30 seconds, control will go back to step 4
and make two more attempts to light the burner, then
go into soft lockout and display Error code 62.
7. Calculate input rate according to the following formula:
3600 x heating value from step 3
7. To restart system, open manual gas valve that was
closed in Step 1. Reset lockout by breaking and
restoring power to boiler. Observe normal operation.
Btuh in put rate = time from step 6
8. Measured input rate should be within +/-2% of input
rating from step 2. If within 2%, go to step 9. If not,
adjustment is required, proceed as follows:
A. Turn boiler off
B. Set up U-tube manometer or differential pressure
gauge for measuring manifold pressure. See
Figure 27, Page 44.
Test High Limit Control And Adjust
While burner is operating,adjust high limit setpoint below
actual boiler water temperature. Burner should go off while
circulator continues to operate. Raise limit setting above
boiler water temperature and burner should reignite after
inter-purge (retry delay). Set high limit control to design
temperature requirements of system. Maximum high limit
setting is 190°F. Minimum high limit setting is 80°F.
C. Manometer or gauge must be able to read at least
0.0 to 3.0 inches water column of pressure, and
resolve to at least 0.1 inches water column.
D. Turn boiler on.
E. Manifold pressure has been nominally set at 2.5
inches w.c. Manifold pressure and input rate must
always be measured with pressure regulator cover
screw installed. Cover screw must be removed for
adjustment. Manifold pressure reading will change
(increase) when cover screw is removed.
42
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CHECK OUT PROCEDURE AND ADJUSTMENT
F. After adjusting input rate, turn boiler off, remove
Set Thermostat To Desired Room Temperature
Observe several operating cycles to verify proper operation.
manometer or pressure gauge, reinstall ⅛” plug
on gas valve. Turn boiler on.
G. Boiler should typically operate between:
• 8.5% -10.0% CO2 on Natural Gas
• 9.5% -11.0% CO2 on Propane Gas
Review All Instructions
Review all instructions shipped with this boiler with owner
or maintenance person. Instructions must be affixed on or
adjacent to the boiler.
Under all conditions CO level should not exceed 100
ppm.
Complete and sign the “Installation and Check-Out
9. Restore all gas appliances that may have been shut off
(while measuring boiler input rate) to normal operating
conditions.
Certificate” on page 54
.
I. Remove regulator cover screw on top of gas valve,
and insert an appropriate screwdriver into adjustment
screw.
II. Turn adjustment screw clockwise to increase input
rate, or counter clockwise to decrease input rate.
III. Replace cover screw, or cover hole temporarily with
your finger to check new manifold pressure setting. Do
not set manifold pressure lower than 2.0 inches w.c.
or higher than 3.0 inches w.c. when adjusting input
rate.
IV.Measure new input rate (cover screw must be
installed). Repeat steps I.-IV until the input rate is
within +/-2% of the nameplate input rating.
V. If the actual input rate can not be set to within 2%
of the correct input rating by adjusting manifold
pressure, a change in gas orifice size is required.
Consult the boiler manufacturer for information on
correct orifice sizing. The specific gravity (G) and the
higher heating value (HHV) of the local natural gas
must be obtained from the local gas utility in order to
determine the proper orifice size.
43
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CHECK OUT PROCEDURE AND ADJUSTMENT
Figure 27 - Manifold Pressure Measurement Detail
Following steps and diagram indicate location of the
connection points required to measure manifold pressure.
Refer to “Differential Air Pressure Switch Check” on page
49 when reading manifold pressure.
Manifold pressure may be measured using a U-Tube
Manometer or Differential Pressure Gauge. Diagram shows
connection of both measuring devices. Only ONE DEVICE IS
REQUIRED to measure manifold pressure.
When measurement is complete, disconnect U-Tube
Manometer or Differential Pressure Gauge. Be sure to
reinstall ⅛” plug, using appropriate pipe thread sealant
approved for use with natural and liquefied Petroleum
gases.
Remove plug. Install appropriate barbed fitting and connect
pressure side line from U-Tube Manometer or Differential
Pressure Gauge.
Figure 28 - Gas Valve
PRESSURE REGULATOR
ADJUSTMENT (UNDER CAP SCREW)
NOTICE
WIRING TERMINALS (2)
VR8205
Regulator cover screw must be installed at all times un-
less adjusting manifold pressure. Firing rate and manifold
pressure must only be measured with cover screw firmly
installed.
OUTLET
PRESSURE
TAP
INLET
PRESSURE
TAP
OUTLET
INLET
ON
OFF
GAS CONTROL KNOB
44
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MAINTENANCE AND CLEANING
2. Check boiler area is free from combustible materials,
Maintenance As Outlined Below Can Be
Performed By Owner Unless Otherwise Noted.
gasoline, and other flammable vapors and liquids.
3. Circulator pump and blower motor furnished with boiler
are permanently lubricated from factory and require no
further lubrication. Additional or non-factory supplied
pumps and/or motors should be lubricated according to
the pump and/or motor manufacturer’s instruction.
• The acidic nature of flue gasses condensing on
aluminum boiler sections may cause formation of
aluminum oxide. This oxide formation is normal,
is generally uniform throughout boiler sections,
and represents negligible mass of aluminum that is
consumed by oxidation during life of the boiler.
• If left unchecked, this buildup may eventually cause
blockage of flue gas passages in boiler sections,
reducing efficiency, and ultimately shutting down the
boiler due to lack of combustion air flow.
Daily During Heating Season
1. Check for and remove any obstruction to the flow of
combustion air or venting of flue gases.
• Regular service and maintenance by a qualified service
agency must be performed to assure safe trouble free
operation and maximum efficiency.
2. Check boiler area is free from combustible materials,
gasoline, and other flammable vapors and liquids.
Monthly During Heating Season
Beginning Of Each Heating Season
1. Remove jacket front and top panels and check for
piping leaks around relief valve and other fittings. If
found, contact qualified service agency to repair. DO
NOT use stop leak compounds.
1. Annual service call by qualified service agency, which
includes:
A. Examine flue passages between boiler sections,
burner, and condensate lines, and clean if
necessary following “Annual Examination And
Cleaning Of Boiler Components” on page 46.
2. Test relief valve. Refer to valve manufacturers
instructions packaged with relief valve.
3. Visually inspect venting and air intake system for
proper function, deterioration, or leakage. If vent or
air intake show any signs of deterioration or leakage,
contact a qualified service agency to repair or replace
immediately and to insure proper reassembly and
resealing of vent and air intake system.
B. Visually inspect venting and air intake system
for proper function, deterioration or leakage. If
vent or air intake show any signs of deterioration
or leakage, repair or replace them, immediately.
Insure proper reassembly and resealing of vent and
air intake system
4. Visually inspect clear vinyl condensate lines and PVC
condensate drain pipe for proper operation, leakage,
and deterioration. If condensate lines or drain pipe
show any signs of blockage, leakage, or deterioration
contact a qualified service agency to clean, repair, or
replace them immediately.
C. Check for and remove any obstruction to flow of
combustion air or venting of flue gases. Check air
baffle located inside 1½” x 2” flexible coupling on
mixer, clean if necessary and make sure to put it
back. Refer to repair parts diagram of mixer and
pressure switch assembly for exact location.
D. Follow instructions for“Operating Instructions” on
page 38.
Periodically During Heating Season
Where low water cutoffs are used, periodic inspection of
low water cut off is necessary, including flushing of float
type devices. Refer to low water cut off manufacturer’s
specific instructions.
E. Follow instructions for“Check Out Procedure and
Adjustment” on page 42.
F. Visually inspect condensate drain lines for proper
operation and deterioration. Check for plugged
condensate drain lines.
G. Check silicone rubber seals between boiler sections.
Insure that there are no leaks. Use RTV silicone
rubber adhesive sealant rated for at least 400° F to
replace or repair seals in locations where original
seals have deteriorated.
End of Each Heating Season - Annual Shutdown
Procedure
Follow instructions “To Turn Off Gas To Appliance” on page
38.
If heating system is to remain out of service during
freezing weather, and does not contain antifreeze, drain
system completely. If boiler will be exposed to freezing
temperatures, drain condensate lines. Otherwise, do not
drain system or boiler.
H. Check all gasketed joints for leakage, and tighten
bolts or replace gaskets if necessary.
I. Remove jacket front and top panels and check for
piping leaks around relief valve and other fittings.
Repair, if found. DO NOT use stop leak compounds.
45
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MAINTENANCE AND CLEANING
K. Reinstall burner and mixer gasket and position
Annual Examination And Cleaning Of Boiler
Components
mixer assembly over studs. Install five (5) nuts but
do not tighten. Reinstall igniter and igniter gasket
and fasten with two (2) screws. Use care when
installing the igniter. Tighten five (5) nuts holding
mixer assembly.
!
DANGER
Before servicing, turn off electrical power to boiler
at service switch. Close manual gas valve to turn
gas supply OFF to boiler. Failure to comply will result
in death or serious injury.
L. Connect:
• Gas line to gas valve
• Condensate drain line to boiler
• Pressure switch hose to gas valve
• Air by-pass to mixer
• 1 ½” x 2” flexible coupling to air inlet and make
sure to put air baffle back to correct position
NOTICE
Have qualified service agency perform the following
service procedures. Boiler owner should not attempt
these procedures.
• Igniter wires
• Gas valve wires
1. Before Servicing, turn off electrical power to boiler at
service switch. Close manual gas valve to turn off gas
supply to boiler.
2. Cleaning Flue passages between boiler sections.
A. Any buildup of sediment or aluminum oxide (white
powdery or flaky substance) in flue passages must
be cleaned as follows.
3. Visually inspect condensate lines leading from boiler
sections and vent pipe connector to condensate trap.
Refer to repair parts diagrams. Any foreign material or
debris visible in condensate lines needs to be cleaned
out as follows:
A. Disconnect condensate drain lines from condensate
trap.
B. Remove condensate trap and drain all water from
trap.
C. Disconnect condensate lines from fitting on bottom
of boiler and vent pipe connector.
D. Run cold water through condensate lines and trap
B. Remove jacket front and top panels. Disconnect
condensate drain line from barbed fitting on bottom
of boiler. Keep open end of drain line above water
level in condensate trap to prevent trap from
draining. Disconnect pressure switch hose from
barbed fitting on gas valve. Disconnect 1½ x 2”
flexible coupling from air inlet. Disconnect air by-
pass (½” transparent vinyl tube) from bottom of
mixer.
to thoroughly flush out any sediment or debris.
E. Reinstall condensate trap and condensate lines.
C. Remove air baffle from ½” x 2” flexible coupling
and clean air baffle if necessary. Refer to repair
parts diagram, mixer and pressure switch
assembly.
F. Follow instructions under “Near Boiler Piping” for
filling condensate trap with water.
4. Inspection of flue connector requires following steps. Refer
to repair parts diagram.
D. Confirm manual gas valve is closed and disconnect
gas line to gas valve at union. Disconnect wires to
gas valve and igniter.
E. Loosen but do not remove five (5) nuts attaching
mixer assembly to boiler. Remove two (2) igniter
screws and remove igniter.
A. Loosen the clamp on the draft inducer end of the
2” vent pipe connector that connects the vent
to the draft inducer. Disconnect (unplug) wiring
harness from draft inducer motor and draft inducer
temperature safety switch. Remove four (4) bolts
that attach draft inducer to flue connector.
B. Remove draft inducer and gasket from top of flue
F. Remove five (5) nuts and remove mixer assembly.
connector.
Remove burner and mixer gasket.
C. Inspect interior of flue connector. Any buildup of
sediment or aluminum oxide on inside surface must
be cleaned. Position draft inducer gasket and draft
inducer and fasten with four (4) screws. Be sure to
connect ground wire from draft inducer motor to
one of four mounting screws.
G. Aluminum oxide deposits are water soluble and
may be rinsed away with spraying or running
water. Before rinsing, connect a ½” I.D. hose to
barbed fitting on bottom of boiler and run hose to
bucket or drain.
H. After rinsing, remove any remaining loosened
sediment using shop vacuum with snorkel
attachment.
D. Connect wiring harness leads to draft inducer motor
and draft inducer temperature safety switch.
E. Connect vent pipe connector to draft inducer outlet.
I. Inspect burner for any foreign matter in flame
ports or inside burner. Any foreign matter should
be removed by blowing with compressed air or
vacuuming.
J. Inspect interior of mixer for any signs of sediment
or aluminum oxide and clean if necessary.
NOTICE
Verify proper operation after servicing.
46
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TROUBLESHOOTING
2. Troubleshooting tools:
!
WARNING
A. Voltmeter to check 120 vac and 24 vac
Fire, explosion or shock hazard. Do not attempt to
modify the physical or electrical characteristics of
this boiler in any way. Failure to comply could result
in death or serious injury.
B. Continuity tester.
C. Inclined manometer or pressure gauge with
0-3.0” Range (0.01” Scale) for measuring suction
pressures at pressure switch.
D. U-tube manometer or differential pressure gauge
with 0-14” range (0.1” Scale) for measuring inlet
Important
1. In reset from lockout condition, all electrical meter
readings at the gas control valve (24 vac) must be
taken within trial for ignition period.
and manifold gas pressures.
3. IBC Error Codes.
A. IBC uses advanced diagnostic capability to assist in
troubleshooting error conditions. Table 10, Page 48
shows error codes that may arise during fault
condition.
2. If any component does not function properly, make
sure it is correctly installed and wired before replacing
it.
3. Static electricity discharge can damage integrated
boiler control (IBC). Touch metal surface to discharge
static electricity before touching IBC.
B. State Conditions shown in Table 9, Page 40 provide
suggestions for servicing these potential errors.
4. IBC cannot be repaired. If it malfunctions it must be
replaced.
5. Only trained service technicians should service IBC
systems. Following troubleshooting, check out system
following sequence of operation for a normal light off
sequence.
6. All controls are factory tested in the assembly process
and a defective control is generally the least likely
cause. If you suspect you have a defective control,
read through this section before you replace it.
7. It is extremely unlikely that the two consecutive
controls are defective. If it seems to be happening,
chances are that either there is nothing wrong with the
control or it is being damaged by some other problem
(an electrical short burning out a transformer, for
example).
Initial Service Checks
1. Before troubleshooting:
A. Make sure that circuit breaker is on or fuse is ok at
electrical panel.
B. Make sure that service switch is on.
C. Make sure that gas is on at the gas meter, at all
appropriate manual shutoff valves and at the gas
control valve.
D. Make sure that the thermostat is calling for heat.
E. Check that wire connectors at the integrated boiler
control and at the originating control are securely
plugged in or connected.
F. Check that hoses are securely connected and are
not plugged or damaged.
47
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TROUBLESHOOTING
Table 10 Error Codes
-
48
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DIFFERENTIAL AIR PRESSURE SWITCH CHECK
• Following steps and diagram indicate locations of
connection points required to check differential air
pressure.
PRESSURE
SWITCH
CONNECTS
BOILER
STATUS
DIFFERENTIAL
PRESSURE (W.C.)
• Differential air pressure switch is safety device which
prevents boiler from firing if there is air intake, boiler
heat exchanger or vent blockage.
Not Running
Setpoint
0”
Normally Open
• Turn off service switch, or lower thermostat setting.
• Remove vinyl caps from Tee and 4-way connector.
1.00” for Model-100
1.60” for Model-75
2.10” for Model-50
• Install testing lines as shown to inclined manometer or
differential pressure gauge with ability to read 0.01” to
3.0” w.c.
Running
Without
Blockage
Greater Than
Setpoints
Closed
Open
• Turn on service switch and set thermostat to call for
heat.
Running
With
Less Than or Equal to
Setpoints
Blockage
If manometer readings do not correspond to chart above,
check for possible causes:
• - Blockage or moisture in suction lines
• - Blockage in air intake or vent pipes
• - Undersized air intake or vent pipes
• - Loose blower wheel or motor shaft
• - Incorrect pressure switch or pressure switch setpoint
When pressure reading is proper and the pressure switch is
operating properly, remove testing lines and reinstall vinyl
caps to Tee and 4-way connector.
49
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APPENDIX A - WATER QUALITY, WATER TREATMENT AND FREEZE PROTECTION
Aluminum Series
High Efficiency Gas-Fired Boiler
DIELECTRIC ISOLATION & ANTIFREEZE PROTECTION
ADDENDUM
!
WARNING
Follow these instructions to prevent damage to
boiler’s heat exchanger caused by inadequate
dielectric isolation, incorrect water treatment or
antifreeze application. Failure to comply could result
in death or serious injury.
• Install boiler so gas ignition system components are
protected from water (dripping, spraying, rain, etc)
during appliance operation and service (circulator re-
placement, etc).
• DIELECTRIC ISOLATION
Two (2) 1-1/4” X 1-1/4” Female to female dielectric
isolation unions are shipped loose in boiler parts bag.
Install Dielectric Isolation unions at boiler supply line
and return line. Install isolation fittings nearest boiler
prior to system piping connections.
• WATER TREATMENT and ANTIFREEZE
PROTECTION
MUST be applied for ALL aluminum series high
efficiency gas-fired boilers using antifreeze
protection.
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System and Operating Precautions
Applies to ALL Aluminum High Efficiency Gas-Fired Water Boilers
Clean System First
Eliminate System Leaks
BEFORE connecting boiler to heating system, clean and
flush system thoroughly. Verify system is free of sediment,
flux and any residual boiler water additives.
Continuous addition of make-up water will constantly add
oxygen to system. Eliminate all system leaks. All system
leaks must be repaired immediately.
Systems having antifreeze not recommended must be
completely flushed to ensure no old antifreeze remains.
In older systems obviously discolored, murky or dirty
water; or pH reading outside acceptable range (between
7.0 and 8.0) are indications the system should be cleaned
or treated. Thoroughly flush system with clean water to
remove any sediment or contaminants. Sludge and iron
oxide deposits can cause rapid breakdown of inhibitors.
DO NOT use stop leak compounds. Leaks in threaded
connections in aluminum boiler sections must be repaired
immediately. Aluminum threads will not seal themselves.
Verify expansion tank is operational and properly sized.
Undersized expansion tanks cause relief valve weeping and
substantial make-up water addition.
Operation of this boiler in system containing significant
amounts of dissolved oxygen can cause severe heat
exchanger corrosion damage.
Flushing with clean water. If chemical cleaners are used,
use only those recommended for use with aluminum
boilers. Follow chemical cleaner manufacturer’s instructions
completely.
This boiler is not designed for use in systems containing
regular additions of make-up water. Regular additions of
make-up water may cause severe heat exchanger damage.
System leaks may not always be visible. An unseen system
leak will become obvious if boiler pressure decreases when
make-up valve is closed.
DO NOT mix different manufacturer’s products.
Fill Water and Chemistry
Verify water used to fill system meets these requirements:
System fluid pH maintained between 7.0 and 8.0.
Maintain water hardness below 7 grains hardness.
This boiler is designed for closed loop hydronic heat system
ONLY! This boiler is not suitable for natural gravity type
installations, or any other open type system.
Filling with chlorinated potable water is acceptable. DO
NOT fill boiler with water containing chlorine in excess of
100 ppm.
DO NOT use inhibitors or other additives that are not listed
in this addendum.
Consult local water treatment specialist for
recommendations if any of above requirements is outside
stated ranges.
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System and Operating Precautions
Applies to ALL Aluminum High Efficiency Gas-Fired Water Boilers
General Guidelines When Using Antifreeze
• Recommend taking pH reading annually, and
adjusted as necessary. Follow antifreeze/inhibitor
manufacturer’s instructions for details on how to
adjust pH.
• Use only antifreeze products recommended
for use with aluminum boilers, as listed in
this addendum. See Table 11.
• Continuous addition of make-up water will dilute
power of antifreeze and change buffers ability to
maintain pH.
• Antifreeze solutions can break down over time.
Failure to check antifreeze chemistry on annual
basis may result in accelerated corrosion of
boiler and other system components. Consult with
antifreeze manufacturer for recommendations.
• Flush old antifreeze from system. Flush boiler and
system separately.
• Do not use antifreeze unless required.
• Use of antifreeze in any boiler will reduce
heating capacity as much as 10-20%. Take
into consideration when sizing heating system,
pumps and expansion tank. Consult antifreeze
manufacturer’s literature for specific information
on reduced capacity.
• Antifreeze, if needed, must be of type listed on
next page due to their operational characteristics
of : type 356 T6 aluminum at operating
temperatures between 20°F (-6.7°C) and 250°F
(121°C). (See Table 11 for allowable products.)
• Always clean system prior to using antifreeze as
stated in this supplement.
• Using antifreeze manufacturer’s instructions,
determine freezing temperature needed and use
correct amount of antifreeze. Never exceed 50%
antifreeze by volume.
• Follow antifreeze manufacturer’s instructions for
use, safe handling and storage of their products.
Refer to MSDS (Material Safety Data Sheets)
provided by antifreeze manufacturer for potential
hazards and first aid procedures for exposure or
ingestion.
• Boiler operating pressure must remain below 15
psi for antifreeze solutions that specify a maximum
of 250°F (121°C). Otherwise, increase system
operating/tank pressure to 20 psig. Note: Refer
to expansion tank manufacturer instructions for
adjusting tank pressure.
• Antifreeze will raise pH of hydronic solution in
heating system above recommended level due to
corrosion inhibitors. Solution must be treated to
maintain a pH within recommended level. Follow
antifreeze manufacturer’s instructions to adjust
pH.
• If system has leaked, water and antifreeze
chemistry will need to be adjusted. To avoid
damage to boiler, check pH and chemistry of boiler
solution and consult the antifreeze manufacturer
for recommendations.
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System and Operating Precautions
Applies to ALL Aluminum High Efficiency Gas-Fired Water Boilers
Table 11 - Antifreeze Products
Compatible Aluminum Antifreeze & Inhibitor Suppliers
Noble Company
P. O. Box 350
Grand Haven, MI 49417
Noburst AL Antifreeze
Tel:
800-878-5788
231-799-8850
Fax:
Rhomar Water Management, Inc.
P. O. Box 229
Rhogard Antifreeze &
Pro-Tek 922 Inhibitor*
Springfield, MO 65801
Tel:
800-543-5975
417-862-6410
Fax:
* Pro-Tek 922 Inhibitor may be used to adjust the pH level of the hydronic system, but on occasion may not resolve the
pH issue. In these cases, flush the system and refill with untreated water and antifreeze suitable for aluminum heat
exchangers, as listed in this supplement.
Hydronic Agencies, Ltd.
(Fernox North Distributor)
15363 117 Avenue
Edmonton, AB T5M 3X4
Canada
Alphi-11
Tel:
780-452-8661
780-488-2304
Fax:
Fernox
Interstate Chemical
2797 Freedland Road
P.O. Box 1600
Intercool NFP-30,40,50 AA
Intercool RPH-15*
Hermitage, PA 16148-0600
Tel: 800-422-2436
Fax: 724-981-8383
Hercules Chemical Company, Inc.
111 South Street
Passaic, NJ 07055
Hercules cryo-tek™-100/Al
Tel: 800-221-9330
Fax: 800-333-3456
* This product may be used to adjust pH level of hydronic system, but on occasion may not resolve pH issue. In these
cases it is recommended to flush system and refill with untreated water and new boiler manufacturer approved
antifreeze suitable for Aluminum heat exchangers.
53
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INSTALLATION AND CHECK-OUT CERTIFICATE
INSTALLATION AND CHECK-OUT CERTIFICATE
Boiler Model
Serial #
Date Installed___________
Measured BTU/HR input____________
Installation instructions have been followed
Checkout procedure and adjustments performed
Maintenance and Service issues reviewed with owner/ maintenance person
Installation booklet affixed on or adjacent to boiler
Installer (Company)
Address
Phone
Installer’s Name
Signature
54
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NOTES
55
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PRODUCT LITERATURE
Lennox Industries Inc.
Dallas, Texas
Manufactured by:
ECR International, Inc.
2201 Dwyer Avenue, Utica NY 13501
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