®
SUNLINE 2000
GAS / ELECTRIC
SINGLE PACKAGE AIR CONDITIONERS
Supersedes: 530.18-N8Y (295)
530.18-N8Y (1096)
INSTALLATION INSTRUCTION
035-14838
MODELS D7CG 036, 048 & 060 (10 SEER)
MODEL D2CG 072 (9 EER)
(STYLE A & Belt Drive Option)
CAUTION
FOR YOUR SAFETY
SCROLL COMPRESSORS
OPERATE IN ONLY ONE
DIRECTION.
Do not store or use gasoline or
other flammable vapors or liquids
in the vicinity of this or any other
appliance.
If you smell gas:
1. Open windows
If the compressor is
experiencing:
- low amperage draw
- similar discharge and
suction pressure
2. Don’t touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
- increased noise level
It is operating in reverse.
Switch two line voltage
connections to correct.
GENERAL
• 530.18-N1.12V -Motorized Outdoor Air Damper Accy.
YORK Model DCG units are single package air conditioners
with gas heat designed for outdoor installation on a roof top or
a slab.
• 530.18-N1.8V -Coil Guard
• 530.18-N2.11V -Low NOx Accessory
The units are completely assembled on rigid, permanently
attached base rails. All piping, refrigerant charge, and electrical
wiringis factory-installedand tested. The unitsrequire onlyelectric
power, gas piping and duct connections at the point of installation.
• 530.18-N8.2V -High Altitude Accy. (Natural Gas)
• 530.18-N8.3V -High Altitude Accy. (Propane)
• 530.18-N8.4V -Gas Piping Accessory
• 530.18-N8.12V -Propane Conversion Accessor
The gas-fired heaters have aluminized steel tubular heat
exchangers and spark ignition with intermittent pilot.
• 690.15-N25V
-Low Ambient Accessory
This appliance is not to be used for temporary heating of
buildings or structures under construction.
Renewal Parts:
• Refer to Parts Manual for complete listing of replacement
INSPECTION
parts on this equipment.
As soon as a unit is received, it should be inspected for possible
damage during transit. If damage is evident, the extent of the
damage should be noted on the carrier’s freight bill. Aseparate
request for inspection by the carrier’s agent should be made in
writing. Refer to Form 50.15-NM for additional information.
All forms referenced in this instruction may be ordered from:
Publications Distribution Center
Unitary Products Group
P.O. Box 1592, York, PA 17405
REFERENCE
APPROVALS
Additional information on the design, installation, operation and
service ofthisequipmentisavailable in thefollowingreference forms:
Design certified by CGA and UL listed as follows:
1. For use as a forced air furnace with cooling unit.
2. For outdoor installation only.
3. For installation directly on combustible flooring or, in the U.S.A.,
on wood flooring or Class A, B, or C roof covering material.
4. For use with natural gas and/or propane (LP) gas.
• 55.70-N1
-General Installation
-Pre-start & Post-start Check List
• 55.70-N2
• 530.18-N1.2V -Economizer Accessory
• 530.18-N1.13V -Man. Outdoor Air Damper Accy 0-35%
• 530.18-N1.14V -Man. Outdoor Air Damper Accy 0-100%
Not suitable for use with conventional venting systems.
Installer should pay particular attention to the words: NOTE, CAUTION and WARNING. Notes are intended to clarify or make
the installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal injury
and/or equipment damage may result if installation procedure is not handled properly.
CAUTION
THIS PRODUCT MUST BE INSTALLED IN STRICT COMPLIANCE WITH THE ENCLOSED INSTALLATION INSTRUCTIONS
AND ANY APPLICABLE LOCAL, STATE, AND NATIONAL CODES INCLUDING, BUT NOT LIMITED TO, BUILDING, ELECTRI-
CAL, AND MECHANICAL CODES
WARNING
INCORRECT INSTALLATION MAY CREATE A CONDITION WHERE THE OPERATION OF THE PRODUCT COULD CAUSE
PERSONAL INJURY, PROPERTY DAMAGE AND/OR DEATH.
WARNING
DE-ENERGIZE THE ELECTRICAL POWER AND TURN OFF THE GAS SUPPLY TO THE UNIT BEFORE ATTEMPTING TO
INSPECT, REPAIR OR PERFORM MAINTENANCE TO THE UNIT.
530.18-N8Y
INSTALLATION
LIMITATIONS
4. Roof structures must be able to support the weight of the unit
and its options and / or accessories. Unit must be installed on
a solid level roof curb or appropriate angle iron frame.
These units must be installed in accordance with the current
editions of the following national and local safety codes:
In the U.S.A.:
CAUTION: If a unit is to be installed on a roof curb or special
frame other than a YORK roof curb, gasketing must
be applied to all surfaces that come in contact with
the unit underside.
1. National Electrical Code ANSI/NFPA No. 70.
2. National Fuel Gas Code Z223.1.
3. Gas-Fired Central Furnace Standard ANSI Z21.47-1993.
4. Local gas utility requirements.
5. Maintain level tolerance to 1/2" maximum across the entire
length or width of the unit.
In Canada:
6. Elevate the unit sufficiently to prevent any blockage of the
air entrances by snow in areas where there will be snow
accumulation. Check the local weather bureau for the
expected snow accumulation in your area.
1. Canadian Electrical Code CSA C22.1
2. Current Gas Installation Codes CAN/CGA-2.3-M93.
3. Local plumbing and waste water codes.
4. Other applicable local codes.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation. Rig the
unit by attaching chain or cable slings to the lifting holes
provided in the base rails. Spreaders, whose length exceeds
the largest dimension across the unit, MUST be used across
the top of the unit.
Refer to Table 1 for Unit Application Data and to Table 2 for Gas
Heat Application Data.
If components are to be added to a unit to meet local codes, they
are to be installed at the dealer’s and / or the customer’s expense.
Size of unit for proposed installation should be based on heat
loss / heat gain calculation made according to the methods of
Air Conditioning Contractors of America (ACCA).
BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT
IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT
WILL LIFT EVENLY.
TABLE 1 - UNIT APPLICATION DATA
Units may also be moved or lifted with a forklift. Slotted
openings in the base rails are provided for this purpose.
UNIT SIZE
036
048
060
072
208/230V
460V
575V
187 / 253
414 / 504
518/630
Voltage Variation
Min. / Max.1
LENGTH OF FORKS MUST BE A MINIMUM OF 42".
Remove the nesting brackets from the four corners on top of
the unit. All screws that are removed when taking these
brackets off must be replaced on the unit.
Supply Air CFM, Nom.
1200
1600
2000
2400
Wet Bulb Temperature (°F) of
Air on Evaporator Coil,
Min. / Max.
Dry Bulb Temperature (°F) of
Air on Condenser Coil,
Min.2 / Max.
57 / 72 57 / 72 57 / 72 57 / 72
45 / 120 45 / 120 45 / 120 45 / 120
CAUTION: An adhesive backed label is provided over the
outside of the combustion air inlet opening to pre-
vent moisture from entering the unit which could
cause damage to electrical components. Allow this
closure label to remain in place until the combus-
tion air hood is to be installed (refer to Figure 5).
1
2
Utilization range “A” in accordance with ARI Standard 110.
A low ambient accessory is available for operation down to 0°F.
Refer to Table 5 for unit weights and to Figure 8 for approximate
center of gravity.
LOCATION
Use the following guidelines to select a suitable location for
these units.
CLEARANCES
All units require certain clearances for proper operation and
service. Installer must make provisions for adequate combustion
and ventilation air in accordance with Section 5.3, Air for
Combustion and Ventilation of the National Fuel Gas Code, ANSI
Z223.1 (in U.S.A.) or Sections 7.2, 7.3 or 7.4 of Gas Installation
Codes CAN/CGA-B149.1 and .2 (in Canada) and/or applicable
provisions of the local building codes. Refer to Figure 9 for the
clearances required for combustible construction, servicing,
and proper unit operation.
1. Unit is designed for outdoor installation only.
2. Condenser coils must have an unlimited supply of air.
Where a choice of location is possible, position the unit on
either north or east side of building.
WARNING:Excessive exposure of this furnace to contami-
nated combustion air may result equipment dam-
age or personal injury. Typical contaminates
include: permanent wave solutions, chlorinated
waxes and cleaners, chlorine based swimming
pool chemicals, water softening chemicals, carbon
tetrachloride, Halogen type refrigerants, cleaning
solvents (e.g. perchloroethylene), printing inks,
paint removers, varnishes, hydrochloric acid, ce-
ments and glues, antistatic fabric softeners for
clothes dryers, masonry acid washing materials.
WARNING: Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet, combustion
air inlet or vent outlet.
DUCTWORK
Ductwork should be designed and sized according to the methods
inManualQoftheAirConditioningContractorsofAmerica(ACCA).
Aclosed return duct system shall be used. This shall not preclude
use of economizers or outdoor fresh air intake. The supply and
return air duct connections at the unit should be made with flexible
joints to minimize the transmission of noise.
3. For ground level installation, a level pad or slab should be
used. The thickness and size of the pad or slab used should
meet local codes and unit weight. Do not tie the slab to the
building foundation.
Unitary Products Group
3
530.18-N8Y
The supply and return air duct systems should be designed for the
CFMandstaticrequirementsofthejob.TheyshouldNOTbesized
to match the dimensions of the duct connections on the unit.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the National
Electrical Code (NEC), ANSI / NFPA 70-1987 (in U.S.A.) current
Canadian Electric Code (CEC) C22.1 (in Canada), and / or local
ordinances. The unit must be electrically grounded in accordance
with the N.E.C. ANSI / NFPA 70 or local codes.
CAUTION: When fastening ductwork to the side duct flanges on
the unit, insert the screws through the duct flanges
only. DO NOT insert the screws through the casing.
Voltage tolerances which must be maintained at the
compressor terminals during start-up and running conditions
are indicated on the unit Rating Plate and Table 1.
Outdoor ductwork must be insulated and waterproofed.
Refer to Figure 9 for information concerning side and bottom
supply and return air duct openings.
The internal wiring harness furnished with this unit is an integral
part of a UL and CGA design certified unit. Field alteration to
comply with electrical codes should not be required.
FILTERS
A disconnect switch should be field provided for the unit. The
switch must be separate from all other circuits. Refer to Figure
9 for installation location. If any of the wire supplied with the
unit must be replaced, replacement wire must be of the type
shown on the wiring diagram.
1" filters are supplied with each unit. 2" replacement filters may
be used with no modification to the filter racks. Filters must
always be installed ahead of the evaporator coil and must be
kept clean or replaced with same size and type. Dirty filters will
reduce the capacity of the unit and will result in frosted coils or
safety shutdown. Minimum filter area and required sizes are
shown in Table 5.
Electricallinesmustbesizedproperlytocarrytheload.USECOPPER
CONDUCTORS ONLY. Each unit must be wired with a separate
branch circuit fed directly from the meter panel and properly protected.
CONDENSATE DRAIN
CAUTION: When connecting electrical power and control wir-
ing to the unit, waterproof type connectors MUST
BE USED so that water or moisture cannot be
drawn into the unit during normal operation. The
above waterproofing conditions will also apply
when installing a field-supplied disconnect switch.
Plumbing must conform to local codes. Use a sealing compound
on male pipe threads. Install a condensate drain line from the 3/4"
PVC female connection on the unit to spill into an open drain.
NOTE: The condensate drain line MUST be trapped to provide
proper drainage. See Figure 1.
Refer to Figure 2 for typical field wiring and to the appropriate unit
wiring diagram for control circuit and power wiring information.
BLOWER SPEED SELECTION
Three blower motor speeds are available on the direct-drive
units. The speed selection for the direct-drive units is
determined by the CFM and ESP requirements of the
applications. All units with belt-drive option have an adjustable
motor pulley to achieve the above conditions.
All direct-drive units with 208/230 voltage are shipped with the
wire labeled #116 connected to the "HIGH" speed tap on the
blower motor. If a lower blower motor speed is desired, this wire
should be moved to the "MED" or "LOW" speed tap on the
motor for the speed desired.
FIG. 1 - RECOMMENDED DRAIN PIPING
SERVICE ACCESS
All direct-drive units with 460 and 575 voltage are shipped with
the wire labeled #116 connected to the "HIGH" speed tap on
the blower motor. If the medium speed is required, connect wire
#116 to the "MED" speed tap and the blue motor lead to the
"HIGH" speed tap. If the low speed is required, connect wire
#116 to the "LOW" speed tap, the blue motor lead to the "HIGH"
speed tap and the orange motor lead to the "MED" speed tap.
Access to all serviceable components is provided by the
following removable panels:
• Scroll compressor compartment
• Burner compartment
• Blower compartment
• Main control box
SCROLL COMPRESSOR
These units are shipped with the scroll compressor mountings
factory-adjusted and ready for operation.
• Filter compartment
• Motor access (on units with belt-drive option)
Refer to Figure 9 for location of these access panels.
CAUTION: Do Not loosen the scroll compressor mounting bolts.
CAUTION: Make sure that all screws are replaced on the unit
to maintain an air-tight seal.
COMBUSTION DISCHARGE
The products of combustion are discharged horizontally
through a screened opening on the gas heat access panel.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 56" above the floor where it will not be subject
to drafts, sun exposure, or heat from electrical fixtures or
appliances. Follow manufacturer’s instructions enclosed with
thermostat for general installation procedure. Color coded
insulated wires (#18 AWG) should be used to connect
thermostat to unit. See Figure 2 for wiring details.
TABLE 2 - GAS HEAT APPLICATION DATA
Temp. Rise °F
Input
Output
Available
on
Models
Gas Rate1
At Full Input 2
Capacity, Capacity,
(Mbh)
50
(Ft.3/Hr.)
(Mbh)
40
Min.
15
Max.
45
55
3 Ton
4 Ton
47
70
75
60
25
100
125
79
99
3/5/6 Ton
4/5/6 Ton
93
116
40/25/25 70/55/55
45/35/35 75/65/65
NOTE: If the unit has an economizer, remove jumper J1 from
terminals 8 and 10 on the relay board to prevent simulta-
neous operation of the scroll compressor and the econo-
mizer. If you want to energize the scroll compressor for
supplemental cooling during the economizer operation,
use a thermostat with two stages of cooling.
NOTE: Gas Heaters are shipped available for natural gas, but can be converted to L.P. with Kit Model
No. 1NP0434. All furnaces meet the latest California seasonal efficiency requirements.
1
3
Based on 1075 Btu/Ft .
2
The air flow must be adjusted to obtain a temperature rise within the range shown.
4
Unitary Products Group
530.18-N8Y
TYPICAL CONTROL WIRING
COOLING / HEATING (24 VOLT THERMOSTAT)
THERMOSTAT1
TERMINALS
COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)
THERMOSTAT1
TERMINALS
UNIT TERMINAL
UNIT TERMINAL
STRIP TB1
STRIP TB1
24 VOLT
TRANSFORMER
ADD
JUMPER
ADD
JUMPER
2
3
24 VOLT
TRANSFORMER
4
NOT
USED
ADD
JUMPER
4
TO REMOTE SENSOR
2TH04702224 IF USED
1 24 VOLT THERMOSTAT 2TH07701024. IF THE UNIT HAS AN ECONOMIZER,
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD
TO PREVENT SIMULTANEOUS OPERATION OF THE SCROLL COMPRESSOR
AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A
SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY
WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024.
1 ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE)
TO CONTROL ECONOMIZER ON SECOND STAGE OF COOLING, REMOVE JUMPER
J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.
2 SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.
3 SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE
ELECTRIC HEATER.
COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)
THERMOSTAT1
4 REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR
P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 AND A2 PROVIDE A RELAY
OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE
THERMOSTAT SWITCHES TO THE SET-BACK POSITION.
TERMINALS
UNIT TERMINAL
STRIP TB1
1 ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).
IF THIS UNIT HAS AN ECONOMIZER, REMOVE JUMPER J1 FROM TERMINALS 8 AND
10 ON THE RELAY BOARD TO PREVENT SIMULTANEOUS OPERATION OF THE
SCROLL COMPRESSOR AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE
ECONOMIZER ON A SECOND STAGE OF COOLING, USE THERMOSTAT 2ET04700224.
ADD
JUMPER
24 VOLT
TRANSFORMER
CAUTION: Label all wires prior to disconnection when servic-
ing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
TYPICAL POWER WIRING
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCONNECT
SWITCH, WIRING & OVERCURRENT
PROTECTION.
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCONNECT
SWITCH, WIRING & OVERCURRENT
PROTECTION.
FIG. 2 - TYPICAL FIELD WIRING
the current Gas Installation Codes CAN/CGA-B149.1 and .2 (in
Canada) should be followed in all cases unless superseded by
local codes or gas company requirements. Refer to Table 3.
DISCONNECT SWITCH BRACKET FOR UNITS
WITH OPTIONAL BELT-DRIVE BLOWER
A special bracket for mounting a field-supplied disconnect
switch is provided in each unit ordered with an optional
belt-drive supply air blower. The bracket is shipped inside the
blower compartment taped to the top of the blower housing.
Install the bracket on the left hand side of the unit as shown in
Figure 9. Several existing screws at the top of the unit and one
screw approximately midway down from the top will be used
for mounting the bracket. Screws should be loosened only -
NOT REMOVED. Matching holes in the bracket have
elongated keyways allowing easy installation. Re-tighten
screws after bracket is in place to ensure panels will remain
leak tight.
TABLE 3 - PIPE SIZING
Nominal Iron Pipe Size
Length in Feet
1/2 in.
3/4 in.
1 in.
1-1/4 in.
10
20
30
40
50
60
70
80
90
100
132
92
73
63
56
50
46
43
40
38
278
190
152
130
115
105
96
90
84
79
520
350
285
245
215
195
180
170
160
150
1,050
730
590
500
440
400
370
350
320
305
GAS PIPING
Proper sizing of gas piping depends on the cubic feet per hour
of gas flow required, specific gravity of the gas and the length
of run. “National Fuel Gas Code” Z223-1992 (in the U.S.A.), or
Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3
inch water column and 0.6 specific gravity gas).
Unitary Products Group
5
530.18-N8Y
FIG. 4 - BOTTOM SUPPLY CONNECTION
FIG. 3 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
EXTERNAL SHUT-OFF
The heating value of the gas may differ with locality. The value
should be checked with the local gas utility.
6. The furnace and its individual manual shut-off valve must
be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.48kPa).
NOTE: There may be a local gas utility requirement specifying
a minimum diameter for gas piping. All units require a
1/2 inch pipe connection at the entrance fitting.
The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.48kPa).
GAS CONNECTION
The gas supply line can be routed through the knockouts
located on the front of the unit or through the opening provided
in the unit’s base. Refer to Figure 9 to locate these access
openings. Typical supply piping arrangements are shown in
Figures 3 and 4. All shaded items are field-supplied.
7. A 1/8 inch NPT plugged tapping, accessible for test gage
connection, must be installed immediately upstream of the
gas supply connection to the furnace.
Two grommets are shipped in the blower compartment (in parts
bag taped to the blower housing) of every unit with gas heat
and should be used in the knockouts when the gas piping
penetrates the front of the unit.
L.P./PROPANE UNITS, TANKS AND PIPING
All gas heat units are shipped fromthe factoryequipped fornatural
gas use only. The unit may be converted in the field for use with
L.P./propane gas with accessory kit model number 1NP0440.
After the gas supply piping has been installed, the bottom
opening should be sealed to prevent water from leaking into
the building.
All L.P./propane gas equipment must conform to the safety
standards of the National Fire Protection Association.
Gas piping recommendations:
For satisfactory operation, L.P./propane gas pressure must be
10.5 inch W.C at the unit under full load. Maintaining proper gas
pressure depends on three main factors:
1. A drip leg and a ground joint union must be installed in the
gas piping.
1. The vaporization rate which depends on (a) the
temperature of the liquid and (b) the “wetted surface” area
of the container or containers.
2. When required by local codes, a manual shut-off valve may
have to be installed outside of the unit.
2. The proper pressure regulation. (Two-stage regulation is
recommended from the standpoint of both cost and
efficiency.)
3. Use wrought iron or steel pipe for all gas lines. Pipe
compound should be applied sparingly to male threads
only.
3. The pressure drop in the lines between regulators and
between the second stage regulator and the appliance.
Pipe size required will depend on the length of the pipe run
and the total load of all appliances.
WARNING:Natural gas may contain some propane. Propane,
being an excellent solvent, will quickly dissolve
white lead or most standard commercial com-
pounds. Therefore, a special pipe compound must
be applied when wrought iron or steel pipe is used.
Shellac base compounds such as Gaskolac or
Stalastic, and compounds such as Rectorseal #5,
Cyde’s or John Crane may be used.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available from
most regulator manufacturers and L.P./propane gas suppliers.
L.P./propane gas is an excellent solvent and special pipe
compound must be used when assembling piping for this gas
as it will quickly dissolve white lead or most standard
commercial compounds. Shellac base compounds such as
Rectorseal #5 are satisfactory for this type of gas.
4. All piping should be cleaned of dirt and scale by hammering
on the outside of the pipe and blowing out the loose dirt and
scale. Before initial start-up, be sure that all of the gas lines
external to the unit have been purged of air.
Check all connections for leaks when piping is completed,
using a soap solution. NEVER USE A FLAME.
5. The gas supply should be a separate line and installed in
accordance with all safety codes as prescribed under
“Limitations”. After the gas connections have been
completed, open the main shut-off valve admitting normal
gas pressure to the mains. Check all joints for leaks with
soap solution or other material suitable for the purpose.
NEVER USE A FLAME.
LOW NOx APPLICATION
For natural gas heat installations in locations which require low
Nitros Oxide emissions, accessory model 1LN0404 must be
installed.
6
Unitary Products Group
530.18-N8Y
1. With filter section access panel removed, take out hood
components, filters and sensor described above. Remove
and discard outdoor air opening cover on back unit (Upper
right hand corner).
VENT AND COMBUSTION AIR HOODS
The vent and combustion air hoods are shipped attached to the
blower housing in the blower compartment. These hoods must
be installed on the outside of the gas heat access panel to
ensure proper unit function. The necessary mounting screws
are provided in a bag also attached to the blower housing.
2. Remove the 1/2" knockout (A) in the units rear panel
(located to the right side of the outdoor air opening). Insert
the two loose wires from inside the unit, into the 1/2"
bushing provided. Insert wires and bushing into knockout.
Snap bushing into place.
The screen for the combustion air intake hood is secured to the
inside of the access panel opening with three fasteners and the
screws used for mounting the hood to the panel. The top flange
of this hood slips in under the top of the access panel opening
when installing. Refer to Figure 5. Remove the protective label
covering the opening just prior to installing this hood.
3. Mount the outdoor air sensor to the rear panel, just below
the knockout described in Step 2. Secure with two
self-drilling screws at dimples (B) provided in the panel.
The vent hood (including its screen) is installed by inserting the
top flange of the hood into the slotted opening in the access
panel. The top screw secures the hood to the access panel.
The remaining two side screws must be installed after the
access panel is installed on the unit. These screws engage the
bottom flue box flange.
NOTE: Sensor must be positioned so that the sensing ports
are at the top (louvers pointing downward) and terminal
connections to the right.
4. Connect the two wires, indicated in Step 2, to the sensor
as follows:
CAUTION: All three screws in the vent hood must be properly
installed before furnaceoperation toinsureallcom-
bustion products are exhausted from the unit.
• Wire #73 to terminal (+)
• Wire #74 to terminal (S)
5. Assemble the LH and RH side plates to the top cover (2
screws each side) to form the hood. Apply gasketing to the
flange surface on each side plate. Extend gasketing 1/4"
beyond top and bottom of each flange to insure adequate
corner sealing. Secure this assembly to the unit back panel
(upper right hand corner). First, remove screw (C) on unit
top cover. Then slip flange of hood cover in under flange of
unit top cover, replace screw (C), engaging hole (E) in hood
flange and tighten. Attach the two side plates to the unit
panel by using two self-drilling screws for each side plate
at dimples (D) provided in the panel.
FIG. 5 - VENT AND COMBUSTION AIR HOODS
6. Position fillpiece at bottom of hood, between the two side
plates but do not secure at this time. (Slotted openings MUST
be downward for drainage). After fillpiece is properly posi-
tioned, note where contact is made with the unit panel. Re-
move fillpiece and apply gasket material to this area to provide
a seal. Reposition fillpiece and secure with 2 screws.
OPTIONAL ECONOMIZER RAIN HOOD
The following procedure should be used when assembling an
economizer rain hood onto a unit. Refer to Figure 6. The
outdoor and return air dampers, damper actuator, the linkage
and all the controls are factory mounted as part of the
economizer option.
7. Install the two filters into the hood assembly, sliding down
along retainers on side plates, into fillpiece at bottom of
hood.
All of the hood components, including the filters, the gasketing
and thehardware forassemblingarelocatedabovethetopfilter
racks within the filter section. The outdoor air sensor is in the
bag of parts located at the bottom of the return air section.
OUTDOOR AIR
C
OPENING COVER
HOOD
COVER
FILTER
COVER
D
D
OUTDOOR AIR
SENSOR
E
D
D
A
GASKETED
FLANGE
GASKET
B
L. H. SIDE
PLATE
FILTER SECTION
ACCESS PANEL
GASKETED
FLANGE
SIDE DUCT
APPLICATION SHOWN
R. H.
SIDE
PLATE
FILTERS
FILLPIECE
FIG. 6 - ECONOMIZER RAIN HOOD ASSEMBLY (OPTION)
Unitary Products Group
7
530.18-N8Y
NOTE: Install filters so that “Air Flow” arrows point toward the
unit.
adjusting screw to the “A”, “B”, “C” or “D” setting corre-
sponding to the lettered curve. For a dual enthalpy econo-
mizer, carefully turn the set point adjusting screw fully
clockwise past the “D” setting.
8. Install filter cover over the end of the hood with one screw
(center of hood), securing filters into position.
10. To check that the damper blades move smoothly without
binding, carefully turn the minimum position adjusting
screw fully clockwise and then energize and de-energize
terminals “R” to “G”. With terminals “R” to “G” energized,
turn the minimum position screw counterclockwise until the
desired minimum position has been attained.
CAUTION: When proceeding with Steps 9 and 10, extreme
care must be exercised while turning both the set
point and minimum position adjusting screws to
prevent twisting them off.
9. The enthalpy set point for the dampers may now be set by
selecting the desired set point from graph in Figure 7. For
a single enthalpy economizer, carefully turn the set point
11. Replace the filter section access panel.
FIG. 7 - ENTHALPY SET POINT ADJUSTMENT
TABLE 4 - STATIC RESISTANCES
EXTERNAL STATIC PRESSURE DROP
RESISTANCE, IWG
CFM
DESCRIPTION
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000
Economizer1, 2
0.07
0.06
0.08
0.07
0.09
0.08
0.11
0.09
0.13
0.10
0.15
0.11
0.17
0.12
0.20
0.14
0.23
0.16
0.26
0.19
0.30
0.22
Bottom Duct Connections1
1
2
Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.
The pressure thru the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 0.25 IWG, the unit will deliver less CFM
8
Unitary Products Group
530.18-N8Y
TABLE 5 - PHYSICAL DATA
UNIT SIZE
048 060
12 x 10 12 x 10
WEIGHTS
MODELS
036
072
12 x 10 12 x 11
CORNER WEIGHTS*
(location, lbs., see figure 8)
UNIT
SIZE
(heat)
UNIT
WEIGHT*
(lbs.)
CENTRIFUGAL BLOWER
(Dia. x Wd. in.)
FAN MOTOR HP
(Direct-Drive)
FAN MOTOR HP
(Belt-Drive)
ROWS DEEP
FINS PER INCH
FACE AREA (Sq. Ft.)
EVAP.
BLOWER
1
3
"A"
180
180
193
193
200
200
186
186
"B"
172
177
185
190
192
197
209
214
"C"
133
138
145
150
150
155
201
206
"D"
140
140
152
152
158
158
179
179
⁄
2
⁄
4
1
1
036 (40 Mbh)
036 (79 Mbh)
048 (60 Mbh)
048 (99 Mbh)
060 (79 Mbh)
060 (99 Mbh)
072 (79 Mbh)
072 (99 Mbh)
625
635
675
685
700
710
775
785
11⁄2
11⁄2
11⁄2
11⁄2
3
13
3.6
3
13
4.3
3
13
5.1
4
13
5.1
EVAP.
COIL
COMPR.
TYPE
HERMETICALLY SEALED
SCROLL TYPE
24
24
24
24
PROPELLER DIA. (in.)
FAN MOTOR HP
NOM. CFM TOTAL
COND.
FAN
1
1
1
1
⁄
4
⁄
4
⁄
4
⁄
4
3,400 3,400 3,400 3,300
ROWS DEEP
FINS PER INCH
FACE AREA (Sq. Ft.)
1
16
1
16
1
22
2
16
16.7
COND.
COIL
17.1
17.1
17.1
OPTIONS / ACCESSORIES WEIGHTS (lbs.)
QUANTITY PER UNIT
(15" x 20" x 1")
QUANTITY PER UNIT
(14" X 25" X 1")
TOTAL FACE AREA
(sq. ft.)
2
1
2
1
2
1
2
1
Economizer
50
26
AIR
FILTERS
(SEE NOTE)
Motorized Outdoor
Air Damper
6.3
6.3
6.3
6.3
Barometric Relief/Fixed
Outdoor Air Intake Damper
10
REFRIGERANT 22
(lbs./oz.)
CHARGE
5/8
6/8
6/8
10/0
Roof Mounting Curb
Belt-Drive Blower
92
5
NOTE: Filter racks are adapted for 1" or 2" thick filters.
CORNER C
CONDENSER
COIL END
BACK
* Weight = Unit + Economizer
APPROXIMATE
CENTER OF
CORNER B
GRAVITY
CORNER D
FRONT
1
82 ⁄ “
4
7
44 ⁄ “
X
8
Y
CORNER A
DIM. 3-5 TON 6 TON
Y
X
19-3/4"
40-3/4"
22"
44"
FIG 8 - CENTER OF GRAVITY
- 3 Thru 6 Ton w/Direct-Drive Blower
TABLE 6 - SUPPLY AIR PERFORMANCE
GAS HEAT VALUES SHOWN @ 230/460/575 Volts
- Side Duct Connections
Available External Static Pressure - IWG*
UNIT
SIZE
MOTOR
SPEED
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
HI
MED
LOW
HI
MED
LOW
-
-
-
-
1699
1582
1421
1868
1714
1604
825
750
670
910
785
715
1650
1524
1367
1795
1650
1541
785
720
650
880
765
695
1570
1410
1315
1722
1589
1490
755
690
620
845
735
670
1430
1324
1246
1635
1508
1416
725
650
605
820
705
645
1360
1260
1185
1544
1407
1337
700
630
590
790
675
620
1280
1185
1110
1419
1306
1230
680
610
570
765
645
595
1180
1100
1020
1300
1195
1120
655
590
545
740
625
575
036
048
1684
1487
1996
1804
1681
800
710
960
838
760
1631
1464
1933
1765
1640
780
690
936
810
738
HI
MED
LOW
2400
2290
2150
1155
1105
1020
2338
2214
2100
1125
1065
990
2274
2145
2029
1095
1030
950
2167
2071
1965
1045
990
910
2096
1990
1905
1010
950
880
1990
1911
1816
980
920
838
1887
1828
1724
945
885
800
1771
1724
1644
905
835
770
1629
1604
1531
855
798
710
060
072
HI
2461
1480
2402
1440
2361
1395
2260
1350
2178
1305
2101
1260
2000
1205
1914
1155
1830
1110
NOTE: For 208 volts,multiply values by 0.95.
*Includes allowances for a wet evaporator coil, 1" filters and gas fired heat exchangers. Refer to Table 8 for static resistance values on applications other than side duct airflows.
TABLE 7 - MOTOR AND DRIVE DATA - Belt-Drive Blower
ADJUSTABLE
MOTOR PULLEY
FIXED
BLOWER PULLEY
PITCH
BORE
DIA.
MOTOR*
BELT
PITCH
BLOWER
RANGE
(RPM)
UNIT
SIZE
PITCH
BORE
DIA.
FRAME SERVICE
DESIG-
HP
RPM
LENGTH
(in.)
SIZE
FACTOR
(in.)
(in.)
NATION
(in.)
(in.)
036
048
060
072
780 - 1090 1-1/2
790 - 1120 1-1/2
850 - 1220 1-1/2
900 - 1250 1-1/2
1725
1725
1725
1725
56
56
56
56
1.15
1.15
1.15
1.15
2.4 - 3.4
2.4 - 3.4
2.4 - 3.4
2.8 - 3.8
7/8
7/8
7/8
7/8
5.7
5.7
5.2
5.2
1
1
1
1
37.3
37.3
37.3
37.3
A36
A36
A36
A36
*All motors have solid bases and are inherently protected. These motors can be selected to operate into their service factor because they are located in the moving air, upstream of any
Unitary Products Group
9
530.18-N8Y
- SUPPLY AIR PERFORMANCE - 3 & 4 Ton w/Belt-Drive Blower
TABLE 8
3 TON - SIDE DUCT CONNECTIONS @ 230/460/575 VOLTS
Available External Static Pressure - IWG*
0.40 0.50 0.60
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
UNIT
SIZE
AIR FLOW
CFM
0.20
0.30
0.70
0.80
2000
1900
1800
1700
1600
1500
1400
1300
1200
843
817
790
-
-
-
-
-
-
860
775
700
-
-
-
-
-
-
880
854
828
802
-
-
-
-
-
925
850
760
670
-
-
-
-
-
919
893
867
840
818
-
-
-
-
1005
920
840
745
665
-
-
-
-
956
930
906
881
858
842
833
-
1065
995
905
815
740
695
650
-
993
970
944
920
898
882
867
858
847
1145
1065
980
900
820
755
705
665
640
1030
1008
985
961
940
922
904
893
880
1195
1125
1040
970
890
835
765
725
680
1067
1046
1025
1001
980
962
942
932
916
1235
1170
1100
1030
950
895
820
785
730
036
-
-
Available External Static Pressure - IWG*
1.10 1.20 1.30
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
UNIT
SIZE
AIR FLOW
CFM
0.90
1.00
1.40
1.50
2000
1900
1800
1700
1600
1500
1400
1300
1200
1103
1085
1064
1040
1020
1003
982
1270
1210
1145
1075
1005
945
880
835
780
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1102
1081
1060
1044
1024
1010
992
1180
1115
1050
995
920
870
815
1121
1100
1086
1067
1053
1034
1140
1085
1035
965
920
855
036
-
1107
1099
1080
1000
960
905
970
953
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND THE HEAT EXCHANGERS. REFER TO THE STATIC RESISTANCES TABLE FOR RESISTANCE VALUES
ON APPLICATIONS OTHER THAN GAS / ELECTRIC UNITS WITH SIDE DUCT AIRFLOWS.
4 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts
Available External Static Pressure - IWG*
UNIT
SIZE
AIR FLOW
CFM
0.20
0.30
0.40
0.50
0.60
0.70
0.80
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
2000
1900
1800
1700
1600
1500
1400
1300
1200
843
817
790
-
-
-
-
-
-
860
775
700
-
-
-
-
-
-
880
854
828
802
-
-
-
-
-
925
850
760
670
-
-
-
-
-
919
893
867
840
818
-
-
-
-
1005
920
840
745
665
-
-
-
-
956
930
906
881
858
842
833
-
1065
995
905
815
740
695
650
-
993
970
944
920
898
882
867
858
847
1145
1065
980
900
820
755
705
665
640
1030
1008
985
961
940
922
904
893
880
1195
1125
1040
970
890
835
765
725
680
1067
1046
1025
1001
980
962
942
932
916
1235
1170
1100
1030
950
895
820
785
730
048
-
-
Available External Static Pressure - IWG*
1.10 1.20 1.30
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
UNIT
SIZE
AIR FLOW
CFM
0.90
1.00
1.40
1.50
2000
1900
1800
1700
1600
1500
1400
1300
1200
1103
1085
1064
1040
1020
1003
982
1270
1210
1145
1075
1005
945
880
835
780
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1102
1081
1060
1044
1024
1010
992
1180
1115
1050
995
920
870
815
1121
1100
1086
1067
1053
1034
1140
1085
1035
965
920
855
048
-
1107
1099
1080
1000
960
905
970
953
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES ON CONNECTIONS
OTHER THAN SIDE DUCT AIRFLOWS.
10
Unitary Products Group
530.18-N8Y
- SUPPLY AIR PERFORMANCE - 5 & 6 Ton w/Belt-Drive Blower
TABLE 9
5 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts
Available External Static Pressure - IWG*
0.40 0.50 0.60
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
UNIT
SIZE
AIR FLOW
CFM
0.20
0.30
0.70
0.80
2500
2400
2300
2200
2100
2000
1900
1800
1700
1600
1500
1059
1032
1005
980
930
877
-
-
-
-
-
1560
1405
1260
1160
1060
950
-
-
-
-
-
1077
1054
1024
1002
957
908
-
-
-
-
-
1590
1470
1275
1170
1070
975
-
-
-
-
-
1095
1074
1049
1022
983
941
894
855
-
1630
1525
1370
1190
1080
1000
885
815
-
1114
1094
1069
1044
1010
976
940
903
884
864
-
1650
1560
1440
1250
1100
1020
940
860
815
770
-
1134
1116
1090
1066
1039
1009
980
950
925
908
882
1660
1595
1475
1350
1160
1050
980
905
850
805
740
1158
1140
1116
1090
1064
1040
1014
988
1685
1620
1505
1410
1260
1100
1020
940
1181
1167
1142
1117
1092
1070
1047
1022
1001
987
1720
1640
1535
1440
1340
1225
1095
970
060
964
948
926
880
835
780
910
870
830
-
-
-
-
965
Available External Static Pressure - IWG*
1.10 1.20 1.30
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
UNIT
SIZE
AIR FLOW
CFM
0.90
1.00
1.40
1.50
2500
2400
2300
2200
2100
2000
1900
1800
1700
1600
1500
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1193
1170
1148
1121
1100
1079
1058
1035
1020
1004
1665
1580
1480
1385
1285
1180
1060
960
1202
1180
1155
1133
1110
1090
1071
1056
1038
1620
1530
1425
1340
1240
1135
1030
965
1190
1169
1143
1122
1103
1088
1070
1475
1385
1280
1190
1100
1035
925
060
1205
1178
1158
1134
1118
1101
1445
1330
1240
1140
1065
980
-
-
1222
1196
1164
1145
1130
1375
1295
1175
1105
1045
1197
1170
1158
1205
1130
1075
-
900
860
1198
1184
1150
1110
880
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES ON CONNECTIONS
OTHER THAN SIDE DUCT AIRFLOWS.
6 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts
Available External Static Pressure - IWG*
UNIT
SIZE
AIR FLOW
CFM
0.20
0.30
0.40
0.50
0.60
0.70
0.80
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
3200
3000
2800
2600
2400
2200
2000
1800
1150
1100
1045
985
930
-
2325
2010
1700
1425
1240
-
1182
1129
1074
1015
958
905
-
2425
2090
1780
1475
1300
1070
-
1212
1157
1102
1045
990
933
-
2525
2150
1850
1540
1350
1160
-
-
-
-
-
-
-
-
-
-
-
1185
1131
1075
1020
965
919
-
2225
1940
1630
1400
1210
1025
-
1215
1160
1103
1051
997
2290
2025
1715
1430
1250
1100
925
1242
1190
1135
1081
1028
982
2360
2075
1760
1490
1285
1130
1005
1217
1163
1111
1060
1014
968
2130
1825
1600
1325
1160
1030
072
-
-
-
-
950
909
-
-
-
-
939
Available External Static Pressure - IWG*
1.10 1.20 1.30
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
UNIT
SIZE
AIR FLOW
CFM
0.90
1.00
1.40
1.50
3200
3000
2800
2600
2400
2200
2000
1800
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1245
1193
1142
1090
1045
998
2190
1920
1675
1380
1175
1050
1222
1173
1124
1077
1028
1990
1730
1450
1200
1060
1250
1205
1155
1109
1058
2060
1800
1550
1275
1060
-
-
072
1234
1186
1140
1087
1885
1640
1360
1075
-
-
-
1217
1170
1118
1710
1460
1150
1249
1205
1148
1775
1545
1250
1235
1176
1600
1360
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES ON CONNECTIONS
OTHER THAN SIDE DUCT AIRFLOWS.
Unitary Products Group
11
530.18-N8Y
TABLE 10 - ELECTRICAL DATA (BASIC UNIT)w/Direct-Drive Blower Motor
VOLTAGE
LIMITATIONS
(SEE NOTE 1)
SUPPLY
MAX.
FUSE
SIZE,
MAX.
HACR
BREAKER
SIZE,
SCROLL
COMPRESSOR
COND.
FAN
MOTOR,
FLA
AIR
BLOWER
MOTOR,
FLA
MINIMUM
CIRCUIT
AMPACITY
UNIT
SIZE
POWER
SUPPLY
(SEE NOTE 2)
MIN.
MAX.
RLA
LRA
AMPS
AMPS
208/230-1-60
208/230-3-60
460-3-60
187
187
414
518
187
187
414
518
253
253
504
630
253
253
504
630
18.0
11.4
6.2
105.0
90.0
45.0
36.0
140.0
105.0
55.0
1.3
1.3
0.8
0.8
1.3
1.3
0.8
0.8
4.4
4.4
2.2
2.2
5.0
5.0
2.2
2.2
28.2
20.0
10.8
9.3
36.8
23.9
11.9
10.1
45
30
15
15
60
35
15
15
45
30
15
-
60
35
15
-
036
048
575-3-60
5.0
208/230-1-60
208/230-3-60
460-3-60
24.4
14.1
7.1
575-3-60
5.6
44.0
208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
187
187
414
518
187
414
518
253
253
504
630
253
504
630
28.9
16.0
8.0
165.0
125.0
67.0
1.3
1.3
0.8
0.8
1.3
0.8
0.8
6.6
6.6
3.3
3.3
6.8
3.6
3.6
44.0
27.9
14.1
12.1
33.5
17.2
14.7
70
40
20
15
50
25
20
70
40
20
-
50
25
-
060
072
6.4
50.0
20.3
10.2
8.2
146.0
73.0
58.4
575-3-60
NOTES: 1. Utilization Range “A” in accordance with ARI Standard 110.
2. Dual element, time delay type.
TABLE 11 - ELECTRICAL DATA (BASIC UNIT)w/Belt-Drive Blower Motor
VOLTAGE
LIMITATIONS
(SEE NOTE 1)
SUPPLY
MAX.
FUSE
SIZE,
MAX.
HACR
BREAKER
SIZE,
SCROLL
COMPRESSOR
COND.
FAN
MOTOR,
FLA
AIR
BLOWER
MOTOR,
FLA
MINIMUM
CIRCUIT
AMPACITY
UNIT
SIZE
POWER
SUPPLY
(SEE NOTE 2)
MIN.
MAX.
RLA
LRA
AMPS
AMPS
208/230-1-60
208/230-3-60
460-3-60
187
187
414
518
187
187
414
518
253
253
504
630
253
253
504
630
18.0
11.4
6.2
105.0
90.0
45.0
36.0
140.0
105.0
55.0
1.3
1.3
0.8
0.8
1.3
1.3
0.8
0.8
5.3
5.3
3.1
3.1
8.6
5.2
2.6
2.0
29.1
20.9
11.7
10.2
40.4
24.1
12.3
9.9
45
30
15
15
60
35
15
15
45
30
15
-
60
35
15
-
036
048
575-3-60
5.0
208/230-1-60
208/230-3-60
460-3-60
24.4
14.1
7.1
575-3-60
5.6
44.0
208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
187
187
414
518
187
414
518
253
253
504
630
253
504
630
28.9
16.0
8.0
165.0
125.0
67.0
1.3
1.3
0.8
0.8
1.3
0.8
0.8
8.6
6.0
3.0
2.4
7.3
3.7
2.8
46.0
27.3
13.8
11.2
34.0
17.3
13.9
70
40
20
15
50
25
20
70
40
20
-
50
25
-
060
072
6.4
50.0
20.3
10.2
8.2
146.0
73.0
58.4
575-3-60
NOTES: 1. Utilization Range “A” in accordance with ARI Standard 110.
2. Dual element, time delay type.
TABLE 12 - SUPERHEAT CHARGING TABLE FOR MODEL 036
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON
OUTDOOR
TEMPERATURE,
°F
INDOOR WB TEMPERATURE, °F
55
57
59
28
23.3
18.5
13.8
9.0
6.7
-
61
29.2
24.9
20.5
16.2
11.8
9.1
6.3
5.3
-
63
30.4
26.5
22.5
18.5
14.6
11.4
8.3
6.8
5.4
-
65
31.6
28.1
24.5
20.9
17.4
13.8
10.3
8.4
67
32.8
29.6
26.5
23.3
20.1
16.2
12.3
10.0
7.7
69
71
73
75
65
70
25.6
26.8
33.3
30.6
27.8
25.0
22.3
18.9
15.6
13.4
11.2
9.0
33.9
31.5
29.1
26.8
24.4
21.7
18.9
16.8
14.7
12.6
10.5
34.4
32.4
30.5
28.5
26.6
24.4
22.2
20.2
18.2
16.2
14.1
34.9
33.4
31.8
30.3
28.7
27.1
25.6
23.6
21.7
19.8
17.8
20.1
21.7
75
14.6
16.6
80
9.0
11.4
85
-
-
-
-
-
-
-
6.3
90
-
-
-
-
-
-
95
100
105
110
115
-
-
6.5
-
-
-
5.4
-
-
-
-
-
6.8
12
Unitary Products Group
530.18-N8Y
TABLE 13 - SUPERHEAT CHARGING TABLE FOR MODEL 048
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON
INDOOR WB TEMPERATURE, °F
OUTDOOR
TEMPERATURE,
°F
55
57
59
22.2
18.7
15.2
11.7
8.3
6.6
-
61
24.3
20.8
17.4
13.9
10.4
8.2
5.9
5.3
-
63
26.3
22.9
19.5
16.0
12.6
9.8
7.0
6.2
5.4
-
65
28.4
25
67
30.5
27.1
23.7
20.3
16.9
13.0
9.1
69
71
73
75
65
70
18.1
20.1
31.7
28.7
25.6
22.6
19.5
16.1
12.6
11.1
9.5
32.9
30.2
27.5
24.8
22.1
19.1
16.1
14.2
12.3
10.5
8.6
34.2
31.8
29.5
27.1
24.7
22.2
19.6
17.4
15.2
13.0
10.7
35.4
33.4
31.4
29.3
27.3
25.2
23.1
20.5
18.0
15.4
12.9
14.5
16.6
75
11.0
13.1
21.6
18.2
14.8
11.4
8.0
7.0
6.0
5.0
-
80
7.5
9.6
85
-
-
-
-
-
-
-
6.1
90
-
-
-
-
-
-
95
100
105
110
115
-
7.9
-
6.7
-
-
5.5
8.0
-
-
-
-
6.4
TABLE 14 - SUPERHEAT CHARGING TABLE FOR MODEL 060
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON
OUTDOOR
TEMPERATURE,
°F
INDOOR WB TEMPERATURE, °F
55
57
22.0
18.9
15.9
12.8
9.7
6.6
-
59
24.0
21.0
18.1
15.1
12.2
8.9
5.7
-
61
25.9
23.1
20.3
17.4
14.6
11.3
7.9
6.5
5.1
-
63
27.8
25.2
22.5
19.8
17.1
13.6
10.1
8.2
65
29.8
27.2
24.7
22.1
19.6
16.0
12.4
9.9
67
31.7
29.3
26.9
24.5
22.0
18.3
14.6
11.6
8.6
69
71
73
75
65
70
20.1
32.5
30.3
28.1
25.9
23.7
20.6
17.4
14.6
11.8
9.0
33.3
31.3
29.3
27.3
25.3
22.8
20.3
17.6
15.0
12.3
9.7
34.1
32.3
30.5
28.7
27.0
25.0
23.1
20.6
18.1
15.7
13.2
35.0
33.4
31.8
30.2
28.6
27.3
25.9
23.6
21.3
19.0
16.7
16.9
75
13.7
80
10.4
85
7.2
90
-
-
-
-
-
-
95
100
105
110
115
-
-
-
6.3
7.4
-
-
-
-
5.6
-
-
-
-
-
-
6.1
TABLE 15 - SUPERHEAT CHARGING TABLE FOR MODEL 072
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON
OUTDOOR
TEMPERATURE,
°F
INDOOR WB TEMPERATURE, °F
55
57
18.0
14.9
11.7
8.5
5.3
5.1
-
59
20.9
17.8
14.8
11.7
8.7
7.7
6.8
6.2
5.6
-
61
23.7
20.8
17.9
15.0
12.0
10.4
8.7
63
26.5
23.7
21.0
18.2
15.4
13.0
10.6
9.2
65
67
69
71
73
75
65
70
15.2
29.3
26.7
24.1
21.4
18.8
15.7
12.6
10.7
8.9
32.1
29.6
27.2
24.7
22.2
18.4
14.5
12.3
10.0
7.8
33.4
31.0
28.7
26.3
23.9
20.7
17.5
15.4
13.4
11.3
9.2
34.7
32.4
30.2
27.9
25.7
23.1
20.4
18.5
16.7
14.8
12.9
36.0
33.8
31.7
29.6
27.4
25.4
23.4
21.7
20.0
18.3
16.6
37.3
35.3
33.2
31.2
29.2
27.8
26.3
24.8
23.3
21.8
20.4
11.9
75
8.6
80
5.2
85
-
-
-
-
-
-
-
90
95
100
105
110
115
-
7.7
-
6.7
7.8
-
5.6
6.4
7.1
-
-
-
-
5.2
5.5
Unitary Products Group
13
530.18-N8Y
(Direct-Drive Units)
SCROLL COMPR.
ACCESS
111⁄2
3
111⁄2
45⁄8
171⁄2
61⁄2
77⁄8
All dimensions are in inches. They are sub-
ject to change without notice. Certified di-
mensions will be provided upon request.
171⁄2
UTILITIES ENTRY DATA
KNOCKOUT
REAR VIEW
SIDE SUPPLY AND RETURN
HOLE
SIZE
(DIA.)
USED FOR
AIR FLOW LEGEND
Control Wiring
(Side or Bottom)**
Power Wiring
(Side or Bottom)
Gas Piping (Front)
Gas Piping (Bottom)
A
B
7/8" *
2" *
DUCT COVERS - Units are shipped with all air duct
openings covered.
For side duct applications;
1. Remove and discard the supply and return air duct
covers.
2. Connect ductwork to duct flanges on the rear of the
unit.
RETURN AIR
SUPPLY AIR
C
D
1-5/8"
1-1/2"
OUTDOOR AIR
*Knockouts in the bottom of the unit can be located by the slice
in the insulation.
**Do not remove the 2" knockout ring.
For bottom duct applications;
OUTDOOR AIR
(Economizer)
1. Remove the side supply air duct cover to gain
access to the bottom supply air knockout panel.
2. Remove and discard the bottom knockout panel.
3. Replace the side duct cover.
4. With filter section access panel removed from the
unit, remove and discard the bottom return air
knockout panel.
3
⁄ “ CONDENSATE
4
DRAIN
(must be trapped)
5. Replace the filter access panel.
271⁄2
193⁄4
CLEARANCES
Front
32"
12" (Less Economizer)
36" (With Economizer or Fixed
Air/Motorized Air Damper)
Back
447⁄8
191⁄2
24" (Less Economizer)
36" (With Economizer)
24"
DETAIL “A”
Left Side (Filter Access)
UNIT WITH ECONOMIZER RAIN HOOD
Right Side (Cond. Coil)
Below Unit1
20"
Above Unit2
72" (For Condenser Air Discharge)
1
2
Units may be installed on combustible floors made from wood or class A, B or C
roof covering material (Applicable in the U.S.A. only).
Units must be installed outdoors. Overhanging structures or shrubs should not
obstruct the outdoor coil nor the fan outlet.
307⁄8
191⁄8
101⁄4
NOTE: A 1" clearance must be provided between any combustible material and the
supply air ductwork for a distance of 3 feet from the unit.
The products of combustion must not be allowed to accumulate within a confined
space and recirculate.
Locate unit so that the vent air outlet hood is at least:
• Three (3) feet above any forced air inlet located within 10 horizontal feet
(excluding those integral to the unit).
DIMENSION "A"
FIXED
31⁄2
B
A
81⁄4
OUTDOOR
12
AIR DAMPER
43⁄8
MOTORIZED
DAMPER
• Four (4) feet below, 4 horizontal feet from, or 1 foot above any door or gravity air
inlet into the building.
1
16 ⁄
"A"
2
447⁄8
DETAIL “B”
• Four (4) feet from electric meters, gas meters, regulators and relief equipment.
UNIT WITH FIXED OUTDOOR
AIR/MOTORIZED DAMPER RAIN HOOD
FIG. 9 - DIMENSIONS AND CLEARANCE (3, 4, 5 & 6 TON)
14
Unitary Products Group
530.18-N8Y
OPERATION
COOLING SYSTEM
When “TH1" on the thermostat closes, the draft motor relay
”DMR" or "DMC" is energized. The “DMR” or "DMC" power
contacts close which energizes the line voltage draft motor. As
the speed of the draft motor reaches approximately 2500 RPM,
the centrifugal switch contact “CS” located on the end of the
draft motor shaft closes to power the ignition control “IC”.
The cooling section is a complete factory package utilizing an
air-cooled condenser. The system is factory-charged with
Refrigerant-22.
The scroll compressor is hermetically sealed and internally
sprung. The scroll compressors have inherent (internal)
protection. If there is an abnormal temperature rise in the scroll
compressor, the protector will open to shut down the scroll
compressor.
After 15 seconds, the "IC" will start the ignitor sparking and will
open the redundant valve located inside the main gas valve
“GV” to allow a flow of gas to only thecarryover tube. SeeFigure
10. Only after the pilot flame has been ignited and the presence
of pilot flame detected at the “IC” by a signal sent back through
the flame sensor is sparking terminated and the main gas valve
opened.
COOLING SEQUENCE OF OPERATION
Single-Stage Cooling: When the thermostat calls for “cooling”,
“R” is closed to “G” and “Y1" (wiring schematic) which
completes the low voltage control circuit, immediately
energizing the scroll compressor, condenser fan motor and
blower motor simultaneously.
REDUNDANT
VALVE
MAIN VALVE
Two-Stage Cooling: A two-stage cooling thermostat may be
used if the unit has an economizer. First-stage cooling is
provided by the economizer - if the outdoor air enthalpy is
acceptable, and second-stage cooling is provided by the scroll
compressor. Jumper wire J1 must be removed. Refer to the unit
wiring diagram.
GAS MAIN
GAS
TO MAIN
BURNER
VALVE
TO PILOT BURNER
After the thermostat is satisfied and opens, all components will
stop simultaneously.
FIG. 10 - GAS VALVE PIPING
CONTINUOUS BLOWER - Continuous blower operation is
possible by closing the R to G circuit on the thermostat.
Gas flows into each of the main burners and is ignited from the
carryover tube flame.
SAFETY CONTROLS (Cooling)
The "IC" will try for 85 seconds to ignite the pilot carryover tube.
If the "IC" fails to detect a pilot flame during the 85 seconds, it
will close the redundant valve. After a 5 minute purge period,
the "IC" will again try to light the pilot carryover tube. This will
continue continuously until the "IC" detects a pilot flame.
The refrigerant system is equipped with the following safety
controls:
1. ASuction Line Freezestat to protect against low evaporator
temperatures due to a low air flow or a low return air
temperature.
If, after detecting a pilot flame and opening the main gas valve,
the "IC" looses pilot flame indication, it will close both the main
and redundant gas valves. The "IC" will start the above
sequence over until a pilot flame is detected and it will open the
main gas valve again.
2. AHigh Pressure Cutout Switch to protect against excessive
discharge pressures due to a blocked condenser coil or a
condenser motor failure.
The "IC" will only allow 16 pilot flameouts and a single rollout
switch opening per thermostat cycle. After 16 pilot flameouts or
a single rollout switch opening, the "IC" closes both the main
and redundant gas valves. The "IC" requires resetting the
thermostat or removal of it’s power lead coming from the draft
motor to reset the "IC" and return it to the above sequence of
operation.
3. ALow Pressure Switch to protect against loss of refrigerant
charge.
If either one of the above safety controls opens, the refrigerant
system will be locked out. The lock out of the system can be
reset by opening the 24V circuit either at the room thermostat
or at the unit disconnect.
At the same time power was supplied to the “DMR” or "DMC",
a parallel circuit activates the time delay ("BT" or "ETD"). The
"BT" or "ETD" closes in approximately 35 seconds and starts
the circulating air blower by energizing the blower interlock
relay “K3", thus closing the ”K3-2" contact and energizing the
blower relay “BR”.
HEATING SEQUENCE OF OPERATION
The following sequence describes the operation of the gasheat
section.
CONTINUOUS BLOWER: With the room thermostat switch set
to “ON”, the supply air blower will operate continuously. The
normally closed blower interlock relay contact “K3-1" provides
24voltpowertothe blowerrelay ”BR". The“BR”powercontacts
close and the blower motor operates.
When the heating cycle is complete, “TH-1" opens
de-energizing the “IC”, thus closing the redundant and main
gas valves. The blower motor and the draft motor continue to
run for a short period after the furnace is shut down until the
"BT" or "ETD"” opens (in approximately 25 seconds)
de-energizing the “K3", ”BR" and "DMR" or "DMC" relays.
INTERMITTENT BLOWER: With the room thermostat system
switch set to the “AUTO” or “HEAT” position and the fan switch
set to “AUTO”, the supply air blower will operate after the room
thermostat calls for heat and the air in the gas heat
compartment has achieved a pre-set temperature.
SAFETY CONTROLS (Heating)
The control circuit includes the following safety controls:
1. Limit Control (LS). This control is located inside the heat
exchanger compartment and is set to open at the
temperature indicated in Table 16. It resets automatically.
Unitary Products Group
15
530.18-N8Y
The limit switch operates when a high temperature
operation of the main burners, a signal is sent to the ignition
control to close the main gas valve.
condition, caused by inadequate supply air flow, occurs
shutting down the ignition control and closing the main gas
valve.
5. Rollout Switch. This switch is located in the burner
vestibule. In the event of a sustained main burner flame
rollout, it shuts off the ignition control and closes the main
gas valve.
TABLE 16 - LIMIT CONTROL SETTING
Capacity, MBH
Limit Control
Units
(Tons)
Opens, °F
Input
50
75
100
125
100
125
100
125
Output
6. Auxiliary Limit Switch. This control is located inside the heat
exchanger compartment and is set to open at 180°F. It is a
manual reset switch. If the auxiliary limit switch trips, then
the primary limit switch has not functioned properly.
Replace the primary limit switch.
3
4
3
4
5
5
6
6
40
60
79
99
79
99
79
99
165
165
165
165
165
165
165
165
HEAT ANTICIPATOR SETPOINTS
The anticipator must be set correctly. Too high of a setting will
result in longer heat cycles and a greater temperature swing in
the conditioned space.
2. Centrifugal Switch (CS-36). If the draft motor should fail, the
centrifugal switch attached to the shaft of the motor
prevents the ignition control and gas valve from being
energized.
Gas Valve
Honeywell VR8204M
White-Rodgers 36E36
Anticipator Setpoint
0.60 amp
0.54 amp
3. Redundant Gas Valve. This valve is an integral part of the
main gas valve and is located up stream of the main gas
valve. Should the main gas valve fail in the open position
the redundant valve serves as a back up and shuts off the
flow of gas.
Reducing the value below the correct setpoint will give shorter
“ON” cycles and may result in the lowering of the temperature
within the conditioned space.
PRE-START CHECK LIST
4. Flame Sensor Rod. This sensor rod is located on the far
side of the carryover tube. If the ignition control does not
receive a signal from the flame sensor indicating that the
pilot flame has ignited properly, the main gas valve will not
open. If the flame sensor fails to detect the pilot flame during
Complete the following checks before starting the unit.
1. Check the type of gas being supplied. Be sure that it is the
same as listed on the unit nameplate.
2. Make sure that the vent and combustion air hoods have
been properly installed.
START-UP
OPERATING INSTRUCTIONS
MANIFOLD GAS PRESSURE ADJUSTMENT
Small adjustments to the high-fire gas flow may be made by
turning the pressure regulator adjusting screw on the automatic
gas valve. Refer to Figure 11.
CAUTION: This furnace is equipped with an intermittent pilot
and automatic re-ignition system. DO NOT attempt
to manually light the pilot.
Adjust as follows:
TO LIGHT PILOT AND MAIN BURNERS:
1. Turn “off” electric power to unit.
“ON”-"OFF"
CONTROL
PILOT ADJ.
(UNDER
2. Turn room thermostat to lowest setting.
3. Turn gas valve knob to “on” position.
4. Turn “on” electric power to unit.
SCREW)
HIGH FIRE ADJ.
(UNDER SCREW)
Honeywell
VR8204M
5. Set room thermostat to desired temperature.
(If thermostat “set” temperature is above room temperature,
pilot burner ignition will occur and, after an interval to prove
pilot flame, main burners will ignite).
“ON”-"OFF" CONTROL
TO SHUT DOWN:
PILOT ADJ.
(UNDER
SCREW)
1. Turn “off” electric power to unit.
2. Depress knob of gas valve while turning to “off” position.
White-Rodgers
36E36
POST-START CHECK LIST (GAS)
After the entire control circuit has been energized and the
heating section is operating, make the following checks:
PRESSURE REGULATOR
1/2-14 NPT (OUTLET)
MANIFOLD ADJUST. SCREW
1. Check for gas leaks in the unit piping as well as the supply piping.
FIG. 11 - GAS VALVES
1. Remove the cap on the regulator. (High Fire adjusting
screw on valve).
2. Check for correct manifold gas pressures. See “Checking
Gas Input”.
3. Check the supply gas pressure. It must be within the limits
shown on rating nameplate. Supply pressure should be
checked with all gas appliances in the building at full fire.
At no time should thestandby gaslinepressureexceed13",
nor the operating pressure drop below 4.5" for natural gas
units. If gas pressure is outside these limits, contact the
local gas utility for corrective action.
2. To decrease the gas pressure, turn the adjusting screw
counterclockwise.
3. To increase the gas pressure, turn the adjusting screw clockwise.
NOTE: Check the unit data plate for the proper manifold pres-
sure and orfice size of the furnace.
16
Unitary Products Group
530.18-N8Y
PILOT CHECKOUT
TABLE 17 - BELT-DRIVE SUPPLY AIR
MOTOR PULLEY ADJUSTMENT
The pilot flame should envelope 3/8 inches of the end of the
flame sensor. Refer to Figure 12. To adjust pilot flame, (1)
remove pilot adjustment cover screw, (2) adjust the screw for
the proper pilot flame, (3) be sure to replace cover screw after
adjustment to prevent possible gas leakage.
BLOWER DRIVE RANGE (RPM)
TURNS
OPEN*
3 TON
4 TON
5 TON
6 TON
900
970
1040
1110
1180
1250
5
4
3
2
1
0
780
842
904
966
1028
1090
790
856
922
988
1054
1120
850
924
998
1072
1246
1220
*Pulley can be adjusted in half-turn increments.
OPTIONAL BELT-DRIVE BLOWER
All units with belt-drive blowers have single-speed motors. The
variable pitch pulley on the blower motor can be adjusted to
obtain the desired supply air CFM. Refer to Table 7 for blower
motor and drive data. The tension on the belts should be
adjusted as shown in Figure 14.
FIG. 12 - PROPER FLAME ADJUSTMENT
Put the system into operation and observe through complete
cycle to be sure all controls function properly.
BURNER INSTRUCTIONS
CAUTION
Procedure for adjusting belt tension:
1. Loosen nut (D) from the motor mount.
2. Never loosen nuts (C) from each other while loosening nut (D).
3. Adjust the tension by turning bolt (B).
Tocheckorchangeburners, pilotororifices, CLOSEMAINMANUAL
SHUT-OFF VALVE AND SHUT OFF ALL POWER TO THE UNIT.
1. Remove the two screws holding either end of the manifold
to the burner supports.
4. Do not loosen the four nuts (top and bottom) (A); unless additional tensioning
distance is required; immediately re-tighten these bolts if loosened.
5. Use a belt tension checker to apply a perpendicular force to one belt at the
midpoint of the span as shown. The deflection force should be applied
until a specific deflection distance of 4mm (5/32")is obtained. To determine
the deflection distance from normal position, use a straight edge from
sheave to sheave as a reference line. The recommended deflection force
is as follows:
2. Open the union fitting in the gas supply line just upstream of the unit
gas valve and downstream from the main manual shut-off valve.
3. Remove the gas piping patch plate.
4. Disconnect wiring to the gas valve and spark ignitor.
Remove the manifold-burner gas valve assembly by lifting
up and pulling back.
Burners are now accessible for service.
Reverse the above procedure to replace the assembly. Make sure
that burners are level and seat at the rear of the heat exchanger.
(B)
(D)
(A)
BURNER AIR SHUTTER ADJUSTMENT
(C)*
* NEVER LOOSEN
Tension new belts at the max. deflection force recommended for the belt
section. Check the belt tension at least two times during the first 24 hours of
operation. Any re-tensioning should fall between the min. and max.
deflection force values.
Adjust burner shutters so that a distinct, sharp, blue flame is
obtained. Refer to Figure 13.
6. After adjusting, re-tighten nut (D) against the motor mount taking care not
to loosen nuts (C).
FIG. 14 - BELT ADJUSTMENT
Start the supply air blower motor. Adjust the resistances in both
the supply and the return air duct systems to balance the air
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other than the equipment installer.
To check the supply air CFM after the initial balancing has been
completed:
FIG. 13 - TYPICAL FLAME APPEARANCE
SUPPLY AIR BLOWER AND TEMPERATURE RISE
ADJUSTMENTS
Remove the (two) 5⁄16" dot plugs from the holes located on the
filter access panel side of the unit.
1.
The speed of the supply air blower will depend on the required
CFM, the unit accessories and the static resistances of both
the supply and the return air duct systems. With this
information, the speed for the supply air blower can be
determined from the blower performance and accessory static
resistance data in Tables 4,6,8 and 9.
2. Insert at least 8" of 1/4 inch tubing into each of these holes
for sufficient penetration into the air flow on both sides of
the evaporator coil.
NOTE: The tubes must be inserted and held in a position
perpendicular to the air flow so that velocity pres-
sure will not affect the static pressure readings.
Knowing the required blower RPM and the blower motor HP,
the speed setting for the supply air motor can be determined.
3. Using an inclined manometer, determine the pressure drop
across a dry evaporator coil. Since the moisture on an
The setting (turns open) for the optional belt-drive supply air
motor pulley can be determined from Table 17.
Unitary Products Group
17
530.18-N8Y
evaporator coil may vary greatly, measuring the pressure
CHECKING GAS INPUT
drop across a wet coil under field conditions would be
inaccurate. To assure a dry coil, the scroll compressors
should be de-energized while the test is being run.
NATURAL GAS
1. Turn off all other gas appliances connected to the gas meter.
4. Knowing the pressure drop across a dry coil, the actual CFM
through the unit can be determined from the curve in Figure 15.
2. With the furnace turned on, measure the time needed for one
revolution of the hand on the smallest dial on the meter. A
typical gas meter usually has a 1/2 or a 1 cubic foot test dial.
0.7
3. Using the number of seconds for each revolution and the
size of the test dial increment, find the cubic feet of gas
consumed per hour from Table 18.
072
0.6
0.5
060
048
If the actual input is not within 5% of the furnace rating (with
allowance being made for the permissible range of the regulator
setting) replace the orifice spuds with spuds of the proper size.
036
0.4
0.3
0.2
0.1
NOTE To find the Btu input, multiply the number of cubic feet of
gas consumed per hour by the Btu content of the gas in
your particular locality (contact your gas company for this
information - it varies widely from city to city.)
TABLE 18 - GAS RATE - CUBIC FEET PER HOUR
Seconds
for One
Rev.
Size of Test Dial
1/2 cu. ft.
0
1 cu. ft.
750
1250
1750
2250
2750
3250
3750
10
12
14
16
18
180
150
129
113
100
360
300
257
225
200
NOMINAL CFM
FIG. 15 PRESSURE DROP vs SUPPLY AIR CFM
20
22
24
26
28
90
82
75
69
64
180
164
150
138
129
The temperature rise (or temperaturedifference between thereturn
air and the heated air from the furnace) must lie within the range
shown on the UL or CGA rating plate and the data in Table 2.
30
32
34
36
38
40
42
44
46
48
60
56
53
50
47
45
43
41
39
37
120
113
106
100
95
90
86
82
78
75
If the CFM is above or below the specified value, the supply air
motor speed may have to be changed by moving the motor
speed tap to another terminal.
Btuh Input x 0.8
CFM =
1.08 x oF Temp. Rise
50
52
54
56
58
60
36
35
34
32
31
30
72
69
67
64
62
60
WARNING:Failure to properly adjust the total system air quan-
tity can result in poor system performance.
5. After readings have been obtained, remove the tubes and
seal the holes with the 5⁄16" dot plugs removed in Step 1.
Example: By actual measurement, it takes 38 seconds for the hand on the 1-cubic
foot dial to make a revolution with just a 100,000 Btuh furnace running. Using this
information, locate 38 seconds in the first column in the table above. Read across
to the column headed “1 Cubic Foot”, where you will see that 95 cubic feet of gas
per hour are consumed by the furnace at that rate. Multiply 95 x 1050 (the Btu
rating of the gas obtained from the local gas company). The result is 99,750 Btuh,
which is close to the 100,000 Btuh rating of the furnace.
NOTE: DE-ENERGIZE THE SCROLL COMPRESSORS BE-
FORE TAKING ANY TEST MEASUREMENTS TO
ASSURE A DRY INDOOR COIL.
SECURE OWNER’S APPROVAL: When the system is functioning properly, secure the owner’s approval. Show him the
location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature
settings within the limitations of the system.
18
Unitary Products Group
530.18-N8Y
MAINTENANCE
The manufacture recommends that the furnace system be
inspected once a year by a qualified service person.
NORMAL MAINTENANCE
CAUTION: Prior to any of the following maintenance proce-
dures, shut off all power to the unit to prevent
personal injury.
CLEANING FLUE PASSAGES AND HEATING
ELEMENTS
Periodic maintenance normally consists of changing or cleaning
filters and (under some conditions) cleaning the main burners.
With proper combustion adjustment the heating element of a
gas fired furnace will seldom need cleaning. If the element
should become sooted, it can be cleaned as follows:
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable.
1. Remove the burner assembly as outlined in “BURNER
INSTRUCTIONS”.
2. Remove the roof over the gas heat section.
MOTORS - Indoor fan and outdoor fan motors are permanently
lubricated and require no maintenance. Ventor motor is factory
lubricated for an estimated 10 year life.
3. At the top front of the heat section, remove the screws
holding the top of the flue collector box. Carefully remove
the top of the flue collector box without ripping the adjacent
insulation.
OUTDOOR COIL - Dirt should not be allowed to accumulate
on the outdoor coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean coil, be sure power to the unit
is shut off prior to cleaning.
4. Lift out the flue diverter baffle.
5. On the inside of the flue collector box, remove the screws
holding the flue baffle. Remove the flue baffle.
6. Using a wire brush on a flexible wand, brush out the inside
of each heat exchanger from the burner inlet and flue outlet
ends.
NOTE: Exercise care when cleaning the coil so that the coil
fins are not damaged.
7. Brush out the inside of the flue collector box and the flue
baffles.
Do not permit the outdoor air discharge to be ob-
structed by overhanging structures of shrubs.
8. Run the wire brush down the vent tube from the flue
collector end.
BURNER&PILOT-Periodically(atleastannuallyatthebeginning
of each heating season) make a visual check of the pilot and main
burner flame. If necessary, adjust main burner primary air shutters
so that no yellow flame is observed as explained under “BURNER
AIR SHUTTER ADJUSTMENT”. If it is not possible to adjust for
the proper flame, the burners may need cleaning.
9. If soot build-up is particularly bad, remove the vent motor
and clean the wheel and housing. Run the wire brush down
the flue extentions at the outlet of the vent housing.
10. After brushing is complete, blow all brushed areas with air
or nitrogen. Vacuum as needed.
TO CLEAN BURNERS - Remove them from the furnace as
explained in “Burner Instructions”. Clean burners with hot water
applied along top of the burner.
11. Replace parts in the order they were removed in Steps
1 to 5.
12. When replacing the top of the flue collector box, be careful
so as not to tear the adjoining insulation.
COMBUSTION AIR DISCHARGE - Visually inspect discharge
outlet periodically to make sure that the buildup of soot and dirt
is not excessive. If necessary, clean to maintain adequate
combustion air discharge.
13. Assure that all seams on the vent side of the combustion
system are air tight. Apply a high temperature (+500°F)
sealing compound where needed.
TROUBLESHOOTING
WARNING:Troubleshooting of components necessarily re-
quires opening the electrical control box with the
power connected to the unit. Use extreme care
when working with live circuits! Check the unit
nameplate for the correct line voltage and set the
volt meter to the correct range before making any
connections with line terminals.
c. If “BR” is pulled in and the blower motor still does not
run, replace the blower motor.
d. If “BR” is not pulled in check for 24 volts at the “BR” coil.
If 24 volts is present, replace the “BR” relay.
e. If 24 volts is not present at the “BR” coil, check for loose
24 volt wiring back to the relay board. Check control
wiring to the room thermostat. If all is fine, replace the
relay board.
f. If the blower motor runs with the fan switch in the “ON”
position but does not run soon after the furnace has
ignited with the fan switch in the “AUTO” position, check
for loose 24 volt wiring between the relay board in the
main control box.
CAUTION: The wire number or color and terminal designations
referred to may vary. Check the wiring label inside the
control box access panel for the correct wiring.
1. Draft motor operates and furnace lights but supply air
blower does not start after a short time delay with room
thermostat fan switch set to “AUTO”.
g. If all control wiring is fine, check for 24 volts at the relay
board. If 24 volts is present, replace the relay board. If
24 volts is not present, replace the “BT” or "ETD".
a. Set fan switch to “ON”. If blower motor runs, go to Step
f. If it does not, check to see if line voltage is being
supplied to the contacts of the blower relay, “BR”, and
if the blower relay is pulled in. Check for loose wiring.
b. If “BR” is pulled in, touch the supply air blower motor
housing. If it is hot the motor may be off on inherent
protection. Disconnect power to the unit and check the
blower motor capacitor. If it is defective, replace it with
one of equal capacitance and voltage.
NOTE: The furnace may shut itself down on a high tempera-
ture condition during the procedure but this will not
effect the test if it is done within 5 minutes of furnace
shut-down.
Unitary Products Group
19
2. The supply air blower operates but the draft motor does not
when the room thermostat is set to call for heat and the fan
switch in the “ON” position.
LIST” and that the pilot adjust screw is allowing some
flow of gas as described in “PILOT CHECKOUT”.
b. Checkallwiringbetweentheignitorcontrolandthegasvalve.
Check to make sure the ground connections are intact.
a. The draft motor has inherent protection. If the motor shell
is hot to the touch, wait for the internal overload to reset.
b. If the motor shell is cold with the room thermostat calling
for heat, check for line voltage at the motor’s Mate-N-
Lok connector attached to the evaporator partition. If
line voltage is present, replace the draft motor.
c. If line voltage is not present, check for line voltage at
the draft motor relay "DMR" or "DMC" contacts in the
main control box and check to see if the “DMR” or
"DMC" is pulled in.
c. If the wiring is intact, check for 24 volts across terminals
“PV” and “COMMON” on the ignitor control. If 24 volts
is not present, replace the ignitor control.
d. If 24 volts is present, remove the pilot burner and
remove the pilot orifice from the pilot burner. The orifice
is removed in the direction opposite the flow of gas.
Inspect the orifice for obstruction. If it is clear, replace
the main gas valve.
5. The sparker sparks at the pilot burner but the pilot does not
ignite and a gas odor is detected at the draft motor outlet.
d. If the “DMR” or "DMC" relay is pulled in, check for a
loose line voltage connection.
a. Adjust the pilot adjust screw on the gas valve as de-
scribed in “PILOT CHECKOUT”.
e. If the “DMR” or "DMC" relay is not pulled in, check for
24 volts at the “DMR” or 24 volts at the "TMC-G"
terminal coil. If 24 volts is present, replace the “DMR”
or "DM" relay. If 24 volts is not present, check for a loose
24 volt connection back to the relay board and check
the connections from the room thermostat to the relay
board. If all connections are correct, replace the relay
board.
b. Check the supply pressure as described in “POST
STARTCHECK LIST”. Makeadjustmentsasnecessary.
c. Check the pilot orifice for obstruction as described in
Item 4. Clean as needed but the problem should not be
the gas valve.
6. The pilot burner ignites but the sparker continues to spark
and the main burners do not ignite.
3. The draft motor runs but the furnace does not light and the
sparker does not spark.
a. Make the same checks and adjustment as described in Item 5.
b. Make sure that the pilot burner is not bent or damaged.
c. Make sure that the ground connections at the pilot
burner, gas valve and ignitor control are intact. Check
the high tension wire for good electrical connection. If
all are intact, replace the ignitor module.
a. Check all 24 volt connections from the relay board to
and in the gas heat section. Check low voltage connec-
tions to the “BT” and "DMC" or "ETD" located in the
control box.
b. If the furnace is hot, it may be out on an over tempera-
ture condition, wait for limit reset.
7. The pilot burner lights and the spark stops but the main
burners do not light.
c. With the draft motor running, check for 24 volts at
terminal 24V on the ignitor control (IC) where the red
lead from the draft motor attaches. If 24 volts is not
present, the centrifugal switch (CS) has not closed or
has gone bad. Check the line voltage to the unit, if it is
correct replace the draft motor. If line voltage is low call
the power company.
a. Check electrical connections between the ignitor con-
trol and the gas valve. If intact, check for 24 volts across
terminals “MV” and “COMMON” terminals. If no voltage
detected, replace ignitor control. If voltage is present,
replace gas valve.
d. If 24 volts is present at the ignitor control, check all
control wiring at the ignitor control and the high tension
wire to the ignitor. Check that the green ground wires
from the ignitor control, the gas valve and pilot burner
are all intact and making good electrical connection.
Check to make sure that the ceramic insulator on the
pilot ignitor or sensor is not broken or cracked, if all are
intact replace the ignition control “IC”.
8. Furnace lights with roll out or one burner has delayed ignition.
a. Make sure that the pilot burner is aligned properly with
the carryover as described in “PILOT CHECKOUT”.
b. Make sure that the carryovers on adjoining burners are
screwed fast and are level with respect to one another.
9. Main burners light but exhibit erratic flame characteristics.
a. Adjust air shutters as described in “BURNER AIR
SHUTTER ADJUSTMENT”.
b. Check the main burner orifices for obstruction and
alignment. Removal procedure is described in
“BURNER INSTRUCTIONS.” Clean or replace burner
orifices and burners as needed.
4. The draft motor runs and the sparker sparks at the pilot
burner but the pilot does not ignite and a gas odor is not
detected at the draft motor outlet.
a. Check to make sure gas is being supplied to the unit.
Make sure that the gas pressure to the unit is within the
proper limits as described in the “POST STARTCHECK
208/230, 575 VOLT
MODELS ONLY
208/230, 460 VOLT
MODELS ONLY
208/230-1-60 VOLT
MODELS ONLY
Unitary Products Group
P.O. Box 1592, York, Pennsylvania USA 17405-1592
Subject to change without notice. Printed in U.S.A.
Copyright by York International Corporation 1998. All Rights Reserved.
530.18-N8Y
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