York Sunline Plus D2eg 048 User Manual

®
SUNLINE PLUS  
GAS / ELECTRIC  
SINGLE PACKAGE AIR CONDITIONERS  
035-14832-003-A-0204  
Supersedes: 035-14832-002-A-0302  
MODELS D2EG 048 & 060 and D3EG 036  
(11 SEER)  
INSTALLATION INSTRUCTION  
FOR YOUR SAFETY  
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  
2. Don't touch electrical switches.  
3. Extinguish any open flame.  
4. Immediatelycallyourgassupplier.  
GENERAL  
530.18-N1.14V -Man. Outdoor Air Damper Accy 0-100%  
530.18-N1.12V -Motorized Outdoor Air Damper Accy.  
530.18-N1.8V -Coil Guard  
YORK Model DEG units are single package air conditioners with  
gasheat designedforoutdoorinstallationonarooftoporaslab.  
The units are completely assembled on rigid, permanently  
attached base rails. All piping, refrigerant charge, and  
electrical wiring is factory-installed and tested. The units  
require only electric power, gas piping and duct connections  
at the point of installation.  
The gas-fired heaters have aluminized steel tubular heat  
exchangers and spark ignition with intermittent pilot.  
This appliance is not to be used for temporary heating of  
buildings or structures under construction.  
530.18-N2.11V -Low NOx Accessory  
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 Accessory  
690.15-N25V  
-Low Ambient Accessory  
Renewal Parts:  
Refer to Parts Manual for complete listing of replacement  
parts on this equipment.  
INSPECTION  
All forms referenced in this instruction may be ordered from:  
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.  
Standard Register  
Toll Free Tel.: 877-318-9675  
Fax: 877-379-7920  
APPROVALS  
REFERENCE  
Design certified by CGA and UL listed as follows:  
Additional information on the design, installation, operation  
and service of this equipment is available in the following  
reference forms:  
1. For use as a forced air furnace with cooling unit.  
2. For outdoor installation only.  
3. Forinstallationdirectlyoncombustibleflooringor, intheU.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  
55.70-N2  
-Pre-start & Post-start Check List  
530.18-N1.2V -Economizer Accessory  
Not suitable for use with conventional venting systems.  
530.18-N1.13V -Man. Outdoor Air Damper Accy 0-35%  
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 in-  
jury 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 INSTRUC-  
TIONS AND ANY APPLICABLE LOCAL, STATE, AND NATIONAL CODES INCLUDING, BUT NOT LIMITED TO, BUILDING,  
ELECTRICAL, 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.  
035-14832-003-A-0204  
INSTALLATION  
CAUTION: If a unit is to be installed on a roof curb or special  
LIMITATIONS  
frame other than a YORK roof curb, gasketing  
must be applied to all surfaces that come in contact  
with the unit underside.  
These units must be installed in accordance with the current  
edition of the following national and local safety codes:  
In the U.S.A.:  
5. Maintain level tolerance to 1/2" maximum across the entire  
length or width of the unit.  
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. 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.  
In Canada:  
RIGGING AND HANDLING  
1. Canadian Electrical Code CSA C22.1  
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.  
BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT  
IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT  
WILL LIFT EVENLY.  
Units may also be moved or lifted with a forklift. Slotted  
openings in the base rails are provided for this purpose.  
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.  
2. Current Gas Installation Codes CAN/CGA-2.3-M93.  
3. Local plumbing and waste water codes.  
4. Other applicable local codes.  
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  
aretobeinstalledat thedealer'sand/ orthecustomer'sexpense.  
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).  
LOCATION  
TABLE 1 - UNIT APPLICATION DATA  
Model DEG  
036  
048  
060  
CAUTION: An adhesive backed label is provided over the out-  
side of the combustion air inlet opening to prevent  
moisture from entering the unit which could cause  
damage to electrical components. Allow this clo-  
sure label to remain in place until the combustion  
air hood is to be installed (refer to Figure 6).  
208/230V  
460V  
187 / 253  
414 / 506  
518 / 630  
1600  
Voltage Variation  
Min. / Max.1  
575V  
Supply Air CFM, Nom.  
1200  
2000  
Wet Bulb Temperature (°F) of  
Air on Evaporator Coil,  
Min. / Max.  
Referto Table4 for unitweightsandto Figure1 for approximate  
center of gravity.  
57 / 72  
57 / 72  
57 / 72  
Dry Bulb Temperature (°F) of  
Air on Condenser Coil,  
Min2 / Max.  
Utilization range “A” in accordance with ARI Standard 110.  
A low ambient accessory is available for operation down to 0°F.  
CLEARANCES  
CONDENSER  
45 / 120  
45 / 120  
45 / 120  
BACK  
COIL END  
APPROXIMATE  
CENTER OF  
GRAVITY  
1
2
FRONT  
Use the following guidelines to select a suitable location for  
these units.  
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.  
B
1A
DIM.  
A
3-5 TON  
19-3/4"  
40-3/4"  
B
FIG. 1 - CENTER OF GRAVITY  
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.  
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, combus-  
tion air inlet or vent outlet.  
DUCTWORK  
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.  
Ductwork should be designed and sized according to the  
methods in Manual Q of the Air Conditioning Contractors of  
America (ACCA).  
A closed 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  
madewithflexiblejointstominimizethetransmissionofnoise.  
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.  
Unitary Products Group  
3
035-14832-003-A-0204  
The supply and return air duct systems should be designed for the  
CFM and static requirements of the job. They should NOT be  
sizedtomatchthedimensionsof theduct connectionsontheunit.  
ordinances. The unit must be electrically grounded in  
accordance with the NEC (as specified above) and/or local  
codes.  
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.  
The internal wiring harness furnished with this unit is an  
integral part of a UL design certified unit. Field alteration to  
comply with electrical codes should not be required.  
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.  
Electrical lines must be sized properly to carry the load. USE  
COPPER CONDUCTORS ONLY. Each unit must be wired  
with a separate branch circuit fed directly from the meter panel  
and properly protected.  
CAUTION: When fastening ductwork to the side duct flanges on  
the unit, insert the screws through the duct flanges  
only. DO NOT insert thescrewsthroughthecasing.  
Outdoorductworkmust beinsulatedandwaterproofed.  
Refer to Figure 9 for information concerning side and bottom  
supply and return air duct openings.  
FILTERS  
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 4.  
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  
wheninstallingafield-supplieddisconnectswitch.  
CONDENSATE DRAIN  
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 pro-  
vide proper drainage. See Figure 2.  
Refer to Figure 3 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  
blowermotor. If a lowerblowermotor speedis desired, this wire  
should be moved to the “MED” or “LOW” speed tap on the  
motor for the speed desired.  
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” speedtap. If the lowspeedis required, connectwire  
#116 to the “LOW” speed tap, the blue motor lead to the “HIGH”  
speedtapandtheorangemotorleadtotheMEDspeedtap.  
FIG. 2 - RECOMMENDED DRAIN PIPING  
SERVICE ACCESS  
Access to all serviceable components is provided by the  
following removable panels:  
Compressor compartment  
Burner compartment  
Blower compartment  
Main control box  
Filter compartment  
COMPRESSORS  
On some units the compressor is mounted on springs which  
have been tightened down for shipment only.  
After this unit is installed, back out the compressor bolts until  
the sleeve clears the top grommet.  
Motor access (on units with belt-drive option)  
Refer to Figure 9 for location of these access panels.  
CAUTION: Make sure that all screws are replaced on the unit  
to maintain an air-tight seal.  
THERMOSTAT  
CAUTION: Do Not loosen compressor mounting bolts.  
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 3 for wiring details.  
TABLE 2 - GAS HEAT APPLICATION DATA  
Temp. Rise °F  
Input  
Output  
Available  
on  
Gas Rate1  
At Full Input 2  
Capacity, Capacity,  
(Ft.3/Hr.)  
(Mbh)  
50  
(Mbh)  
40  
Models  
Min.  
15  
Max.  
45  
55  
3 Ton  
4 Ton  
47  
70  
75  
60  
25  
100  
125  
79  
99  
3/5 Ton  
4/5 Ton  
93  
116  
40/25  
45/35  
70/55  
75/65  
NOTE: If the unit has an economizer, remove jumper J1 from  
terminals 8 and 10 on the relay board to prevent si-  
multaneous operation of the compressor and the  
economizer. If you want to energize the compressor  
for supplemental cooling during the economizer op-  
eration, 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.  
3
1Based on 1075 Btu/Ft .  
2The air flow must be adjusted to obtain a temperature rise within the range shown.  
COMBUSTION DISCHARGE  
POWER AND CONTROL WIRING  
The products of combustion are discharged horizontally  
through a screened opening on the gas heat access panel.  
Field wiring to the unit must conform to provisions of the National  
Electrical Code (NEC) ANSI/NFPA No. 70 and/or local  
4
Unitary Products Group  
035-14832-003-A-0204  
COOLING / HEATING (24 VOLT THERMOSTAT)  
CONTROL WIRING  
COOLING / HEATING (ELECTRONIC THERMOSTAT)  
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POWER WIRING  
REFER TO THE ELECTRICAL  
REFER TO THE ELECTRICAL  
DATA TO SIZE THE DISCONNECT  
SWITCH, THE WIRING AND THE  
OVERCURRENT PROTECTION  
DATA TO SIZE THE DISCONNECT  
SWITCH, THE WIRING AND THE  
OVERCURRENT PROTECTION  
FIG. 3 - TYPICAL FIELD WIRING  
The heating value of the gas may differ with locality. The value  
should be checked with the local gas utility.  
DISCONNECT SWITCH BRACKET FOR UNITS  
WITH OPTIONAL BELT-DRIVE BRACKET  
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.  
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  
approximately midway down from the top will be used for  
mounting the bracket. Screws should be loosened only - NOT  
REMOVED. Mounting 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  
3/4 in.  
1/2 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  
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” Z223.1 should be followed in all  
cases unless superseded by local codes or gas company  
requirements. Refer to Table 3.  
90  
84  
79  
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
035-14832-003-A-0204  
FIG. 5 - BOTTOM SUPPLY CONNECTION  
FIG. 4 - EXTERNAL SUPPLY CONNECTION  
EXTERNAL SHUT-OFF  
EXTERNAL SHUT-OFF  
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 4 and 5. 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.  
After the gas supply piping has been installed, the bottom  
opening should be sealed to prevent water from leaking into the  
building.  
L.P./PROPANE UNITS, TANKS AND PIPING  
All gas heat units are shipped from the factory equipped for  
natural gas use only. The unit may be converted in the field for  
use with L.P./propane gas with accessory kit model number  
1NP0434.  
All L.P./propane gas equipment must conform to the safety  
standards of the National Fire Protection Association.  
Gas piping recommendations:  
1. A drip leg and a ground joint union must be installed in the  
gas piping.  
For satisfactory operation, L.P./propane gas pressure must be  
10.5inchW.Cattheunitunderfullload. Maintainingpropergas  
pressure depends on three main factors:  
2. When required by local codes, a manual shut-off valve may  
have to be installed outside of the unit.  
1. The vaporization rate which depends on (a) the  
temperature of the liquid and (b) the “wetted surface” area  
of the container or containers.  
3. Use wrought iron or steel pipe for all gas lines. Pipe  
compound should be applied sparingly to male threads  
only.  
2. The proper pressure regulation. (Two-stage regulation is  
recommended from the standpoint of both cost and  
efficiency.)  
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.  
3. The pressure drop in the lines between regulators and  
between the second stage regualtor and the appliance.  
Pipe size required will depend on the length of the pipe run  
and the total load of all appliances.  
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 compunds such as  
Rectorseal #5 are satisfactory for this type of gas.  
Check all connections for leaks when piping is completed,  
using a soap solution. NEVER USE A FLAME.  
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.  
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  
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).  
For natural gas heat installations in locations which require low  
Nitros Oxide emmissions, accessory model 1LN0404 must be  
installed.  
6
Unitary Products Group  
035-14832-003-A-0204  
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 panel to ensure  
proper unit function. The necessary mounting screws are  
provided in a bag that is also attached to the blower housing.  
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 6. Remove the protective label  
covering the opening just prior to installing this hood.  
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.  
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.  
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.  
NOTE: Sensor must be positioned so that the sensing ports  
are at the top (louvers pointing downward) and termi-  
nal 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 furnace operation to insure all  
combustionproductsareexhaustedfromtheunit.  
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. 6 - VENT AND COMBUSTION AIR HOODS  
OPTIONAL ECONOMIZER RAIN HOOD  
6. Position fillpiece at bottom of hood, between the two side  
plates but do not secure at this time. (Slotted openings  
MUSTbe downward for drainage). After fillpiece is properly  
positioned, note where contact is made with the unit panel.  
Remove fillpiece and apply gasket material to this area to  
provide a seal. Reposition fillpiece and secure with 2  
screws.  
The following procedure should be used when assembling an  
economizer rain hood onto a unit. Refer to Figure 7. The  
outdoor and return air dampers, damper actuator, the linkage  
and all the controls are factory mounted as part of the  
economizer option.  
All of the hood components, including the filters, the gasketing  
and the hardware for assembling are located above the top  
filter racks within the filter section. The outdoor air sensor is in  
thebagofpartslocatedatthebottomofthereturnairsection.  
7. Install the two filters into the hood assembly, sliding down  
along retainers on side plates, into fillpiece at bottom of  
hood.  
OUTDOOR AIR  
C
OPENING COVER  
HOOD  
COVER  
FILTER  
COVER  
OUTDOOR AIR  
SENSOR  
D
E
D
A
GASKETED  
FLANGE  
D
GASKET  
B
D
L. H. SIDE  
PLATE  
FILTER SECTION  
ACCESS PANEL  
GASKETED  
FLANGE  
FILTERS  
R. H.  
SIDE  
SIDE DUCT  
APPLICATION SHOWN  
PLATE  
FILLPIECE  
FIG. 7 - ECONOMIZER RAIN HOOD ASSEMBLY (OPTION)  
Unitary Products Group  
7
035-14832-003-A-0204  
NOTE: Install filters so that “Air Flow” arrows point toward the  
unit.  
8. Install filter cover over the end of the hood with one screw  
(center of hood), securing filters into position.  
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 8. For a  
single enthalpy economizer, carefully turn the set point ad-  
justing screw to the “A”, “B”, “C” or “D” setting correspond-  
ing to the lettered curve. For a dual enthalpy economizer,  
carefully turn the set point adjusting screw fully clockwise  
past the “D” setting.  
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.  
11. Replace the filter section access panel.  
FIG. 8 - ENTHALPY SET POINT ADJUSTMENT  
TABLE 4 - PHYSICAL DATA  
DEG  
048  
12 x 10  
WEIGHTS (LBS)  
3 Ton  
MODELS  
036  
060  
615  
655  
680  
Basic Unit  
CENTRIFUGAL BLOWER (Dia. x Wd. in.)  
FAN MOTOR HP (Direct-Drive)  
FAN MOTOR HP (Belt-Drive)  
12 x 10  
12 x 10  
1
1.5  
3
13  
5.1  
4 Ton  
5 Ton  
EVAP.  
BLOWER  
(Nom. Max.)  
1.5  
1.5  
OPTIONS / ACCESSORIES  
Economizer  
Motorized Outdoor  
Air Damper  
Barometric Relief/Fixed  
Outdoor Air Intake Damper  
ROWS DEEP  
FINS PER INCH  
FACE AREA (Sq. Ft.)  
3
13  
3.6  
3
13  
4.3  
50  
26  
EVAP.  
COIL  
PROPELLER DIA. (in.)  
FAN MOTOR HP  
NOM. CFM TOTAL  
22  
22  
22  
COND.  
FAN  
10  
4,500  
4,200  
4,500  
Roof Mounting Curb  
Belt-Drive Blower  
92  
5
ROWS DEEP  
FINS PER INCH  
FACE AREA (Sq. Ft.)  
2
2
2
COND.  
COIL  
18  
18  
18  
17.1  
17.1  
17.1  
AIR  
FILTERS  
(SEE NOTE)  
QUANTITY PER UNIT (14" x 20" x 1")  
QUANTITY PER UNIT (14" X 25" X 1")  
TOTAL FACE AREA (sq. ft.)  
2
1
6.3  
2
1
6.3  
2
1
6.3  
CHARGE  
REFRIGERANT 22 (lbs./oz.)  
9/12  
9/8  
9/8  
COMPRESSOR QUANTITY PER UNIT (HERMETIC TYPE) 1 / RECPT 1 /RECPT 1 / SCROLL  
NOTE: Filter racks are adapted for 1" or 2" thick filters.  
TABLE 5 - SUPPLY AIR PERFORMANCE  
- 3, 4, & 5 TON w/Direct-Drive Blower  
Side Duct Connections  
GAS HEAT VALUES SHOWN @ 230/460/575 VOLTS -  
Available External Static Pressure - IWG*  
0.50 0.60 0.70  
CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts  
MODEL MOTOR  
0.20  
0.30  
0.40  
0.80  
0.90  
1.00  
DEG  
SPEED  
HI  
MED  
LOW  
-
-
-
-
1699 825 1650 785 1570 755 1430 725 1360 700 1280 680 1180 655  
036  
1684 800 1631 780 1582 750 1524 720 1410 690 1324 650 1260 630 1185 610 1100 590  
1487 710 1464 690 1421 670 1367 650 1315 620 1246 605 1185 590 1110 570 1020 545  
HI  
1996 960 1933 936 1868 910 1795 880 1722 845 1635 820 1544 790 1419 765 1300 740  
1804 838 1765 810 1714 785 1650 765 1589 735 1508 705 1407 675 1306 645 1195 625  
1681 760 1640 738 1604 715 1541 695 1490 670 1416 645 1337 620 1230 595 1120 575  
2400 1155 2338 1125 2274 1095 2167 1045 2096 1010 1990 980 1887 945 1771 905 1629 855  
2290 1105 2214 1065 2145 1030 2071 990 1990 950 1911 920 1828 885 1724 835 1604 798  
2150 1020 2100 990 2029 950 1965 910 1905 880 1816 838 1724 800 1644 770 1531 710  
048  
060  
MED  
LOW  
HI  
MED  
LOW  
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.  
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND THE GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES  
ON APPLICATIONS OTHER THAN GAS/ELECTRIC UNITS WITH SIDE DUCT AIRFLOWS.  
8
Unitary Products Group  
035-14832-003-A-0204  
TABLE 6 - SUPPLY AIR PERFORMANCE - 3 & 4 Tonw/Belt-Drive Blower  
3TON - 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  
MODEL AIR FLOW  
0.20  
0.30  
0.70  
0.80  
DEG  
CFM  
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  
MODEL AIR FLOW  
0.90  
1.00  
1.40  
1.50  
DEG  
CFM  
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  
4 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  
MODEL AIR FLOW  
0.20  
0.30  
0.70  
0.80  
DEG  
CFM  
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  
MODEL AIR FLOW  
0.90  
1.00  
1.40  
1.50  
DEG  
CFM  
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 THE GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES  
ON APPLICATIONS OTHER THAN GAS / ELECTRIC UNITS WITH SIDE DUCT AIRFLOWS.  
Unitary Products Group  
9
035-14832-003-A-0204  
TABLE 7 - SUPPLY AIR PERFORMANCE - 5 Ton w/Belt-Drive Blower  
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  
MODEL AIR FLOW  
0.20  
0.30  
0.70  
0.80  
DEG  
CFM  
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  
MODEL AIR FLOW  
0.90  
1.00  
1.40  
1.50  
DEG  
CFM  
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 THE GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES  
ON APPLICATIONS OTHER THAN GAS / ELECTRIC UNITS WITH SIDE DUCT AIRFLOWS.  
10  
Unitary Products Group  
035-14832-003-A-0204  
TABLE 8 - STATIC RESISTANCES  
EXTERNAL STATIC PRESSURE DROP  
RESISTANCE, IWG  
DESCRIPTION  
Economizer1, 2  
CFM  
1800  
0.13  
0.10  
1000  
0.07  
0.06  
1200  
0.08  
0.07  
1400  
0.09  
0.08  
1600  
0.11  
0.09  
2000  
0.15  
0.11  
2200  
0.17  
0.12  
2400  
0.20  
0.14  
2600  
0.23  
0.16  
Bottom Duct Connections1  
1
Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.  
2
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  
during full economizer operation.  
TABLE 9 - MOTOR AND DRIVE DATA - Belt-Drive Blower  
ADJUSTABLE  
FIXED  
MOTOR*  
BLOWER  
BELT  
PITCH  
MOTOR PULLEY  
BLOWER PULLEY  
MODEL  
RANGE  
(RPM)  
PITCH  
BORE  
DIA.  
PITCH  
BORE  
DIA.  
FRAME SERVICE  
DESIG-  
NATION  
HP  
RPM  
LENGTH  
(in.)  
SIZE  
FACTOR  
(in.)  
(in.)  
(in.)  
(in.)  
DEG 036  
DEG 048  
DEG 060  
790 - 1120 1-1/2  
790 - 1120 1-1/2  
850 - 1220 1-1/2  
1725  
1725  
1725  
56  
56  
56  
1.15  
1.15  
1.15  
2.4 - 3.4  
2.4 - 3.4  
2.4 - 3.4  
7/8  
7/8  
7/8  
3.7  
5.7  
5.2  
1
1
1
37.3  
37.3  
37.3  
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  
heating device.  
TABLE 10 - ELECTRICAL DATA - w/Direct-DriveBlower Motor  
VOLTAGE  
SUPPLY  
AIR  
BLOWER  
MOTOR,  
FLA  
MAX.  
FUSE  
MAX.  
HACR  
COND.  
FAN  
MOTOR,  
FLA  
LIMITATIONS COMPRESSOR  
(SEE NOTE 1)  
MINIMUM  
CIRCUIT  
AMPACITY  
MODEL  
DEG  
POWER  
SUPPLY  
SIZE,  
BREAKER  
SIZE,  
(SEE NOTE 2)  
AMPS  
MIN. MAX.  
RLA  
LRA  
AMPS  
208/230-1-60 187  
208/230-3-60 187  
253  
253  
504  
630  
253  
253  
504  
630  
253  
253  
504  
630  
16.7  
13.1  
6.7  
87  
110  
54  
2.3  
2.3  
1.4  
1.4  
2.3  
2.3  
1.4  
1.4  
2.3  
2.3  
1.4  
1.4  
4.4  
4.4  
2.0  
2.2  
5.0  
5.0  
2.2  
2.2  
6.6  
6.6  
3.3  
3.3  
27.5  
23.1  
12.0  
10.7  
38.6  
25.7  
13.2  
11.4  
49.0  
33.0  
17.2  
14.6  
40  
35  
15  
15  
60  
40  
20  
15  
80  
50  
25  
20  
40  
35  
15  
15  
60  
40  
20  
15  
80  
50  
25  
20  
036  
048  
060  
460-3-60  
575-3-60  
414  
518  
5.1  
44  
208/230-1-60 187  
208/230-3-60 187  
18.7  
11.9  
6.3  
135  
130  
64  
460-3-60  
575-3-60  
414  
518  
4.9  
52.0  
208/230-1-60 187  
208/230-3-60 187  
32.1  
19.3  
10.0  
7.9  
135  
150  
73  
460-3-60  
575-3-60  
414  
518  
50  
NOTES: 1. Utilization Range “A” in accordance with ARI Standard 110.  
2. Dual element, time delay type.  
TABLE 11 - ELECTRICAL DATA - w/Belt-DriveBlower Motor  
VOLTAGE  
SUPPLY  
AIR  
BLOWER  
MOTOR,  
FLA  
MAX.  
FUSE  
MAX.  
HACR  
COND.  
LIMITATIONS COMPRESSOR  
MINIMUM  
CIRCUIT  
AMPACITY  
MODEL  
DEG  
POWER  
SUPPLY  
FAN  
MOTOR,  
FLA  
(SEE NOTE 1)  
SIZE,  
BREAKER  
SIZE,  
(SEE NOTE 2)  
AMPS  
MIN. MAX.  
RLA  
LRA  
AMPS  
208/230-1-60 187  
208/230-3-60 187  
253  
253  
504  
630  
253  
253  
504  
630  
253  
253  
504  
630  
16.7  
13.1  
6.7  
87  
110  
54  
2.3  
2.3  
1.4  
1.4  
2.3  
2.3  
1.4  
1.4  
2.3  
2.3  
1.4  
1.4  
7.6  
5.3  
2.6  
2.0  
8.6  
5.2  
2.6  
2.0  
8.6  
6.0  
3.0  
2.4  
30.7  
23.9  
12.4  
9.8  
42.6  
26.3  
14.3  
11.4  
51.0  
32.4  
16.9  
13.7  
45  
35  
20  
15  
60  
40  
20  
15  
80  
50  
25  
20  
45  
35  
20  
15  
60  
40  
20  
15  
80  
50  
25  
20  
036  
048  
060  
460-3-60  
575-3-60  
414  
518  
5.1  
44  
208/230-1-60 187  
208/230-3-60 187  
18.7  
11.9  
6.3  
135.0  
130.0  
64.8  
460-3-60  
575-3-60  
414  
518  
4.9  
52.0  
208/230-1-60 187  
208/230-3-60 187  
32.1  
19.3  
10.0  
7.9  
169  
123  
62  
460-3-60  
575-3-60  
414  
518  
50  
NOTES: 1. Utilization Range “A” in accordance with ARI Standard 110.  
2. Dual element, time delay type.  
Unitary Products Group  
11  
035-14832-003-A-0204  
(DirectDriveUnits)  
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.  
For bottom duct applications;  
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.  
5. Replace the filter access panel.  
All dimensions are in inches. They are  
subject to change without notice. Certi-  
fied dimensions will be provided upon  
CLEARANCES  
Front  
32"  
12" (Less Economizer)  
UTILITIES ENTRY DATA  
Back  
36" (With Economizer or Fixed  
Air/motorized Air Damper)  
11  
3
KNOCKOUT  
SIZE  
HOLE  
USED FOR  
24" (Less Economizer)  
36" (With Economizer)  
24"  
Left Side (Filter Access)  
(DIA.)  
11  
Control Wiring  
(Side or Bot-  
tom)**  
Power Wiring  
(Side or Bot-  
tom)  
Right Side (Cond. Coil)  
Below Unit1  
A
B
7/8" *  
2" *  
20"  
4
Above Unit2  
72" (For Condenser Air Discharge)  
1 Units may be installed on combustible floors made from wood or class A, B or C  
roof covering material.  
2 Units must be installed oudoors. Overhanging structures or shrubs should not  
obstruct the outdoor coil nor the fan outlet.  
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).  
Four (4) feet below, 4 horizontal feet from, or 1 foot above any door or gravity air inlet  
into the building.  
17  
7
Gas Piping  
(Front)  
Gas Piping  
(Bottom)  
6
C
D
1-5/8"  
1-1/2"  
17  
*Knockouts in the bottom of the unit can be located by  
the slice in the insulation.  
**Do not remove the 2" knockout ring.  
REAR VIEW  
SIDE SUPPLY AND RETURN  
AIR OPENINGS  
Four (4) feet from electric meters, gas meters, regulators and relief equipment.  
AIR FLOW LEGEND  
RETURN AIR  
SUPPLY AIR  
OUTDOOR AIR  
“ CONDENSATE  
DRAIN  
(must be trapped)  
B
OUTDOOR AIR  
(Economizer)  
A
DIMENSION “A”  
FIXED  
OUTDOOR  
12  
“A”  
AIR DAMPER  
DETAIL “B”  
UNIT WITH FIXED OUTDOOR  
AIR/MOTORIZED DAMPER RAIN HOOD  
DETAIL “A”  
UNIT WITH ECONOMIZER RAIN HOOD  
MOTORIZED  
DAMPER  
FIG. 9 - DIMENSIONS AND CLEARANCES (3, 4 & 5 TON)  
12  
Unitary Products Group  
035-14832-003-A-0204  
OPERATION  
CONTINUOUS BLOWER: With the room thermostat switch  
COOLING SYSTEM  
set to “ON”, the supply air blower will operate continuously. The  
normally closed blower interlock relay contact “K3-1" provides  
24 volt power to the blower relay ”BR". The “BR” power  
contacts close and the blower motor operates.  
The cooling section is a complete factory package utilizing an  
air-cooled condenser. The system is factory-charged with  
Refrigerant-22.  
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 temeprature.  
The compressor is hermetically sealed and internally sprung.  
The compressors have inherent (internal) protection. If there is  
an abnormal temperature rise in the compressor, the protector  
will open to shut down the compressor.  
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”.  
After 15 seconds the “IC” will start the ignitor sparking and will  
open the redundant valve locted inside the main gas valve  
“GV” to allow a flow of gas to only the carryover tube. See  
Figure 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.  
PRELIMINARY OPERATION COOLING  
After the installation has been completed, energize the  
crankcase heater (3 ton only) for at least 4 hours before  
operating the unit. After this initial warm-up, the compressor  
should be given three false starts (energized just long enough  
to make a few revolutions) with a 5 minute delay between each  
start before being put into full time service.  
NOTE: Prior to each cooling season, the crankcase heater (3  
ton only) must be energized at least 10 hours before  
the system is put into operation.  
REDUNDANT  
VALVE  
MAIN VALVE  
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 compressor, condenser fan motor and blower  
motor simultaneously.  
GAS MAIN  
GAS  
TO MAIN  
BURNER  
VALVE  
TO PILOT BURNER  
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  
compressor. Jumper wire J1 must be removed. Refer to the  
unit wiring diagram.  
FIG. 10 - GAS VALVE PIPING  
Gas flows into each of the main burners and is ignited from the  
carryover tube flame.  
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.  
After the thermostat is satisfied and opens, the blower will  
continuetorunforashorttime. Allothercomponentswillstop.  
CONTINUOUS BLOWER - Continuous blower operation is  
possible by closing the R to G circuit on the thermostat.  
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.  
SAFETY CONTROLS (Cooling)  
The refrigerant system is equipped wth the following safety  
controls:  
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.  
1. A Suction Line Freezestat to protect against low evapora-  
tor temperature due to low air flow or a low return air tem-  
perature.  
2. AHigh Pressure Cutout Switch to protect against excessive  
discharge pressures due to a blocked condenser coil or a  
condenser motor failure.  
At the same time power was supplied to the “DMR” or “DMC”, a  
parallel circuit activates the time delay relay “BT” or “ETD”. The  
“BT” or “ETD” closes in approximetly 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”.  
3. ALow Pressure Switch to protect against loss of refrigerant  
charge.  
If neither 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.  
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.  
HEATING SEQUENCE OF OPERATION  
The following sequence describes the operation of the gas  
heat section.  
Unitary Products Group  
13  
035-14832-003-A-0204  
SAFETY CONTROLS (Heating)  
The control circuit includes the following safety controls:  
pilot flame has ignited properly, the main gas valve will not  
open. If the flame sensor fails to detect the pilot flame  
during operation of the main burners, a signal is sent to the  
ignition control to close the main gas valve.  
1. Limit Control (LS). This control is located inside the heat  
exchanger compartment and is set to open at the  
temperature indicated in Table 12. It resets automatically.  
The limit switch, operates when a high temperature  
condition, caused by inadequate supply air flow occurs,  
thus 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 12 - LIMIT CONTROL SETTING  
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.  
HEAT ANTICIPATOR SETPOINTS  
The anticipator must be set at 0.1 amps. Too high of a setting  
will result in longer heat cycles and a greater temperature  
swing in the conditioned space.  
Capacity, MBH  
Limit Control  
Opens, °F  
Units  
(Tons)  
Input  
Output  
3
4
3
4
5
5
50  
75  
100  
125  
100  
125  
40  
60  
79  
99  
79  
99  
165  
165  
165  
165  
165  
165  
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.  
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.  
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.  
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  
PRE-START CHECK LIST  
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.  
TO LIGHT PILOT AND MAIN BURNERS:  
1. Turn “off” electric power to unit.  
2. Turn room thermostat to lowest setting.  
3. Turn gas valve knob to “on” position.  
4. Turn “on” electric power to unit.  
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"  
PILOT ADJ.  
(UNDER  
CONTROL  
SCREW)  
HIGH FIRE ADJ.  
(UNDER SCREW)  
Honeywell  
VR8204M  
“ON”-"OFF" CONTROL  
TO SHUT DOWN:  
1. Turn “off” electric power to unit.  
2. Depress knob of gas valve while turning to “off” position.  
PILOT ADJ.  
(UNDER  
SCREW)  
White-Rodgers  
POST-START CHECK LIST (GAS)  
36E36  
PRESSURE REGULATOR  
After the entire control circuit has been energized and the  
heating section is operating, make the following checks:  
1/2-14 NPT (OUTLET)  
MANIFOLD ADJUST. SCREW  
1. Check for gas leaks in the unit piping as well as the supply  
piping.  
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 the standby gas line pressure exceed 13",  
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.  
FIG. 11 - GAS VALVES  
Adjust as follows:  
1. Remove the cap on the regulator. (High Fire adjusting screw  
on valve).  
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 dataplate for the proper manifold pres-  
sure and orifice size of the furnace.  
14  
Unitary Products Group  
035-14832-003-A-0204  
Knowing the required blower RPM and the blower motor HP,  
the speed setting for the supply air motor can be determined.  
PILOT CHECKOUT  
The setting (turns open) for the optional belt-drive supply air  
motor pulley can be determined from Table 13.  
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.  
TABLE 13 - BELT-DRIVE SUPPLY AIR  
MOTOR PULLEY ADJUSTMENT  
BLOWER DRIVE RANGE (RPM)  
TURNS  
OPEN*  
3 TON  
4 TON  
5 TON  
5
4
3
2
1
0
780  
842  
790  
856  
850  
924  
904  
922  
998  
966  
1028  
1090  
988  
1054  
1120  
1072  
1246  
1220  
*Pulley can be adjusted in half-turn increments.  
OPTIONAL BELT-DRIVE BLOWER  
FIG. 12 - PROPER FLAME ADJUSTMENT  
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 9 for blower  
motor and drive data. The tension on the belts should be  
adjusted as shown in Figure 14.  
Put the system into operation and observe through complete  
cycle to be sure all controls function properly.  
BURNER INSTRUCTIONS  
To check or change burners, pilot or orifices, CLOSE MAIN  
MANUAL 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.  
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.  
BURNER AIR SHUTTER ADJUSTMENT  
Adjust burner shutters so that a distinct, sharp, blue flame is  
obtained. Refer to Figure 13.  
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 AIR BLOWER AND TEMPERATURE  
RISE ADJUSTMENTS  
1. Remove the (two) " dot plugs from the holes located on  
the filter access panel side of the unit.  
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  
Table 5 through 8.  
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.  
Unitary Products Group  
15  
035-14832-003-A-0204  
NOTE: The tubes must be inserted and held in a position per-  
pendicular to the air flow so that velocity pressure will  
not affect the static pressure readings.  
CHECKING GAS INPUT  
NATURAL GAS  
3. Using an inclined manometer, determine the pressure drop  
across a dry evaporator coil. Since the moisture on an  
evaporator coil may vary greatly, measuring the pressure  
drop across a wet coil under field conditions would be inac-  
curate. To assure a dry coil, the compressors should be de-  
energized while the test is being run.  
1. Turn off all other gas appliances connected to the gas me-  
ter.  
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 con-  
sumed per hour from Table 14.  
0.6  
060  
048  
0.5  
0.4  
0.3  
0.2  
0.1  
036  
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.  
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.)  
0
TABLE 14 - GAS RATE - CUBIC FEET PER HOUR  
750  
1250  
1750  
2250  
2750  
3250  
3750  
Seconds  
for One  
Rev.  
Size of Test Dial  
1/2 cu. ft.  
NOMINAL CFM  
1 cu. ft.  
FIG. 15 - PRESSURE DROP ACROSS A DRY  
10  
12  
14  
16  
18  
180  
150  
129  
113  
100  
360  
300  
257  
225  
200  
EVAPORATOR COIL VS SUPPLY AIR CFM,  
WITHOUT AIR FILTERS  
4. Knowing the pressure drop across a dry coil, the actual  
CFM through the unit can be determined from the curve in  
Figure 15.  
20  
22  
24  
26  
28  
30  
32  
34  
36  
38  
40  
42  
44  
46  
48  
50  
52  
54  
56  
58  
60  
90  
82  
75  
69  
64  
60  
56  
53  
50  
47  
45  
43  
41  
39  
37  
36  
35  
34  
32  
31  
30  
180  
164  
150  
138  
129  
120  
113  
106  
100  
95  
90  
86  
82  
78  
75  
72  
69  
67  
64  
62  
60  
The temperature rise (or temperature difference between the  
return air and the heated air from the furnace) must lie within the  
range shown on the UL rating plate and the data in Table 2.  
=
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.  
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  
sealtheholeswiththe5/16"dotplugsremovedinStep1.  
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 re-  
sult is 99,750 Btuh, which is close to the 100,000 Btuh rating of the furnace.  
NOTE: DE-ENERGIZE THE COMPRESSOR BEFORE TAK-  
ING 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 loca-  
tion 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.  
16  
Unitary Products Group  
035-14832-003-A-0204  
MAINTENANCE  
NORMAL MAINTENANCE  
CLEANING FLUE PASSAGES AND HEATING  
ELEMENTS  
CAUTION: Prior to any of the following maintenance proce-  
dures, shut off all power to the unit to prevent per-  
sonal injury.  
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:  
Periodic maintenance normally consists of changing or cleaning  
filters and (under some conditions) cleaning the main burners.  
1. Remove the burner assembly as outlined in “BURNER IN-  
STRUCTIONS”.  
FILTERS - Inspect once a month. Replace disposable or clean  
permanent type as necessary. DO NOT replace permanent  
type with disposable.  
2. Remove the roof over the gas heat section.  
3. At the top front of the heat section, remove the screws hold-  
ing the top of the flue collector box. Carefully remove the  
top of the flue collector box without ripping the adjacent in-  
sulation.  
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.  
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 collec-  
tor end.  
BURNER & PILOT - Periodically (at least annually at the  
beginning 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.  
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.  
11. ReplacepartsintheordertheywereremovedinSteps1to5.  
12. When replacing the top of the flue collector box, be careful  
so as not to tear the adjoining insulation.  
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.  
The manufacture recommends that the furnace system be  
inspected once a year by a qualified service person.  
Unitary Products Group  
17  
035-14832-003-A-0204  
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.  
e. If the “DMR” or “DMC” relay is not pulled in, check for 24  
volts at the “DMR” or 24 volts at “TMC-G” terminal coil. If  
24 volts is present, replace the “DMR” or “DMC” relay. If  
24 volts is not present, check for a loose 24 volt connec-  
tion back to the relay board and check the connections  
from the room thermostat to the relay board. If all connec-  
tions are correct, replace the relay board.  
CAUTION: The wire number or color and terminal designa-  
tions referred to may vary. Check the wiring label  
inside the control box access panel for the correct  
wiring.  
3. The draft motor runs but the furnace does not light and the  
sparker does not spark.  
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 con-  
trol box.  
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”.  
b. If the furnace is hot, it may be out on an over tempera-  
ture condition, wait for limit reset.  
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 sup-  
plied to the contacts of the blower relay, “BR”, and if the  
blower relay is pulled in. Check for loose wiring.  
c. With the draft motor running, check for 24 volts at termi-  
nal 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 re-  
place the draft motor. If line voltage is low call the power  
company.  
b. If “BR” is pulled in, touch the supply air blower motor  
housing. If it is hot the motor may be off on inherent pro-  
tection. Disconnect power to the unit and check the  
blower motor capacitor. If it is defective, replace it with  
one of equal capacitance and voltage.  
d. If 24 volts is present at the ignitor control, check all con-  
trol 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 re-  
place the ignition control “IC”.  
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 wir-  
ing to the room thermostat. If all is fine, replace the relay  
board.  
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.  
f. If the blower motor runs with the fan switch in the “ON”  
position but does not run soon after the furnace has ig-  
nited with the fan switch in the “AUTO” position, check  
for loose 24 volt wiring between the relay board in the  
main control box, the Mate-N-Lok connector in the par-  
tition between the evaporator and gas heat sections  
and the time delay relay “BT” or “ETD”.  
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 START  
CHECK LIST” and that the pilot adjust screw is allowing  
someflowofgasasdescribedinPILOTCHECKOUT”.  
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”.  
b. Check all wiring between the ignitor control and the gas  
valve. Check to make sure the ground connections are  
intact.  
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.  
NOTE: The furnace may shut itself down on a high temperature  
condition during the procedure but this will not effect the  
test if it is done within 5 minutes of furnace shut-down.  
d. If 24 volts is present, remove the pilot burner and re-  
move the pilot orifice from the pilot burner. The orifice is  
removed in the direction opposite the flow of gas. In-  
spect the orifice for obstruction. If it is clear, replace the  
main gas valve.  
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.  
a. The draft motor has inherent protection. If the motor shell  
ishot tothetouch, wait fortheinternaloverloadtoreset.  
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.  
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.  
a. Adjust the pilot adjust screw on the gas valve as de-  
scribed in “PILOT CHECKOUT”.  
b. Check the supply pressure as described in “POST  
START CHECK LIST”. Make adjustments as neces-  
sary.  
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. Check the pilot orifice for obstruction as described in  
Item 4. Clean as needed but the problem should not be  
the gas valve.  
d. If the “DMR” or “DMC” relay is pulled in, check for a  
loose line voltage connection.  
Cont'd  
18  
Unitary Products Group  
035-14832-003-A-0204  
TROUBLESHOOTING - Continued.  
6. The pilot burner ignites but the sparker continues to spark  
and the main burners do not ignite.  
8. Furnace lights with roll out or one burner has delayed igni-  
tion.  
a. Make the same checks and adjustments as described  
in Item 5.  
a. Make sure that the pilot burner is aligned properly with  
the carryover as described in “PILOT CHECKOUT”.  
b.Makesurethatthepilotburnerisnotbentordamaged.  
b. Make sure that the carryovers on adjoining burners are  
screwedfast andarelevelwithrespecttooneanother.  
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.  
9. Mainburnerslightbutexhibiterraticflamecharacteristics.  
a. Adjust air shutters as described in “BURNER AIR  
SHUTTER ADJUSTMENT”.  
7. The pilot burner lights and the spark stops but the main  
burners do not light.  
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.  
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  
is detected, replace the ignitor control. If voltage is pres-  
ent, replace the gas valve.  
Unitary Products Group  
19  
Unitary Products Group  
5005 York Drive, Norman Oklahoma 73069  
Subject to change without notice. Printed in U.S.A.  
Copyright © by York International Corporation 2004. All Rights Reserved.  
035-14832-003-A-0204  
Supersedes: 035-14832-002-A-0302  

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