York Air Conditioner D2cg300 User Manual
SUNLINE 2000  
®
ELECTRIC / ELECTRIC & GAS / ELECTRIC  
SINGLE PACKAGE AIR CONDITIONERS  
(Constant Air Volume)  
Supersedes: 530.18-N11Y (195)  
530.18-N11Y (399)  
035-16133  
INSTALLATION INSTRUCTION  
MODELS D2CE & D2CG300  
(8.5 EER)  
208/230/575  
VOLT ONLY  
208/230/460  
VOLT ONLY  
DCG MODEL  
SHOWN  
SAFETY CONSIDERATIONS  
INSPECTION  
Due to system pressure, moving parts and electrical components,  
installation and servicing of air conditioning equipment can be  
hazardous. Only qualified, trained, service personnel should  
install, repair, maintain or service this equipment.  
‘YORK Model DCE and DCG units are single package air  
conditioners designed for outdoor installation on a rooftop or a  
slab and is manufactured under ISO 9002 Quality System  
Certification. The DCE models are cooling only and can be  
equipped with factory installed electric heaters for cooling /  
heating applications. The DCG models are gas-fired central  
heating furnaces with cooling.  
The units are completely assembled on rigid, permanently attached  
baserails.Allpiping, refrigerantcharge, andelectricalwiringisfactory  
installed and tested.All units require electric power, duct connections  
and fixed outdoor air intake damper (units without economizer or  
motorized damper option only) at the point of installation.  
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. A separate request for inspection by the carrier’s agent  
should be made in writing. Refer to Form 50.15-NM for  
additional information.  
REFERENCE  
Additional information on the design, installation, operation and  
service of this equipment is available in the following reference forms:  
• 44-320-10  
- Barometric Relief Damper Accessory  
• 530.18-N6.1V - Propane Conversion Accessory  
• 530.18-N6.2V - High Altitude Accessory (Nat. Gas)  
• 530.18-N6.3V - High Altitude Accessory (Propane)  
• 530.18-n13y - Coil Guard Installation  
Renewal Parts:  
The DCG units additionally require gas connection, installation of the  
combustion air inlet hood and the flue gas outlet hoods at the point of  
installation.The gas-fired heaters have aluminized-steel tubular heat  
exchangers and spark ignition with proven pilot.  
Supplemental electric heaters for DCE units have nickel-chrome  
elements and utilize single point power connections.  
• Refer to the Renewal Parts Manual for complete listing of  
replacement parts on this equipment.  
All forms referenced in this instruction may be ordered from:  
Publications Distribution Center  
Unitary Products Group  
P.O. Box 1592, York, Pa. 17405  
The following safety precautions apply to DCG units:  
APPROVALS  
Design certified by ETL & CGA as follows:  
FOR YOUR SAFETY  
1. For use as a central cooling only unit with or without  
supplemental electric heat. (DCE models)  
If you smell gas:  
1. Open windows.  
2. For useas aforced air furnacewithcoolingunit.(DCGmodels)  
3. For use with natural gas or propane gas. (DCG models)  
4. For outdoor installation only.  
2. Don’t touch electrical switches; do not use  
any phones in the area of the gas leak.  
3. Extinguish any open flame.  
4. Immediately call your gas supplier from another  
location.Follow your gas supplier’s  
instructions.  
5. For installation on combustible material.  
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 LIMITEDTO, BUILDING, ELECTRICAL, AND MECHANICALCODES.  
5. If you cannot reach your gas supplier, call the  
fire department.  
WARNING  
FOR YOUR SAFETY  
INCORRECT INSTALLATION MAY CREATE A CONDITION  
WHERE THE OPERATION OF THE PRODUCT COULD CAUSE  
PERSONAL INJURY OR PROPERTY DAMAGE  
Do not store or use gasoline or other flammable  
vapors and liquids in the vicinity of this or any  
other appliance.  
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.  
530.18-N11Y  
INSTALLATION  
CAUTION: If a unit is to be installed on a roof curb or special  
frame, gasketing must be applied to all surfaces  
that come in contact with the unit underside.  
LIMITATIONS  
These units must be installed in accordance with the following  
applicable national and local safety codes:  
In U.S.A.:  
1. National Electrical Code ANSI/NFPA No. 70.  
2. National Fuel Gas Code Z223.1.  
3. Gas-Fired Central Furnace Standard ANSI Z21.47a.  
4. Local gas and electric utility requirements.  
In Canada:  
5. Maintain level tolerance to 1/2" maximum across the entire  
length or width of the unit.  
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 round 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.  
Units may also be moved or lifted with a forklift, from the front  
or rear only, providing that an accessory skid is used.  
LENGTH OF FORKS MUST BE A MINIMUM OF 90".  
1. Current Canadian Electrical Code C22.1.  
2. Current Gas Installation Codes CAN/CGA-B149.1 and .2  
3. Local plumbing and waste water codes.  
4. Other applicable local codes.  
Refer to the Unit Application Data Table and to the Gas Heat Application  
DataTable.  
CAUTION: On gas heating units, an adhesive backed label is  
provided over the outside of the combustion air inlet  
opening to prevent moisture from entering the unit  
which could cause damage to electrical  
components. Allow this closure label to remain in  
place until the combustion air hood is to be  
installed.  
After installation, units with gas heat must be adjusted to obtain a  
temperature rise within the range specified on the unit rating plate.  
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  
the Air Conditioning Contractors of America (ACCA).  
This furnace is not to be used for temporary heating of buildings  
or structures under construction.  
TABLE 1 - UNIT APPLICATION DATA  
208/230-3-60  
460-3-60  
575-3-60  
187 / 253  
414 / 506  
518 / 630  
Voltage Variation,  
Min. / Max.1  
Supply Air CFM, Min. / Max.  
8,000 / 12,000  
Wet Bulb Temperature (°F) of Air on  
57 / 72  
Evaporator Coil, Min. / Max.  
Dry Bulb Temperature (°F) of Air on  
25 / 120  
Condenser Coil, Min.2 / Max.  
1
2
Utilization range “A” in accordance with ARI Standard 110.  
A low ambient accessory is available for applications down to 0°F.  
LOCATION  
Use the following guidelines to select a suitable location for  
these units.  
FIG. 1 - TYPICAL RIGGING  
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.  
3. For ground level installation, use a level concrete slab with  
a minimum thickness of 4 inches. The length and width  
should be at least 6 inches greater than the unit base rails.  
Do not tie slab to the building foundation.  
5
4
136-1/4"  
WARNING:Excessive exposure of this furnace to contami-  
nated combustionair may resultinequipmentdam-  
age or personal injury. Typical contaminates in-  
clude: 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.  
FIG. 2 - CENTER OF GRAVITY  
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 Dimensions and  
Clearances table for the clearances required for combustible  
construction, servicing, and proper unit operation.  
4. Roof structures must be able to support the weight of the  
unit and its options and/or accessories. Unit must be in-  
stalled on a solid level roof curb or appropriate angle iron  
frame.  
WARNING:Do not permit overhanging structures or shrubs to  
obstruct outdoor air discharge outlet, combustion  
air inlet or vent outlets.  
Unitary Products Group  
3
530.18-N11Y  
DUCTWORK  
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  
made with flexible joints to minimize noise.  
The supply and return air duct systems should be designed for  
the CFM and static requirements of the job. They should NOT  
be sized to match the dimensions of the duct connections on  
the unit.  
CAUTION: When fastening ductwork to side duct flanges on  
unit, insert screws through duct flanges only. DO  
NOT insert screws through casing.  
Outdoor ductwork must be insulated and  
waterproofed.  
Refer to the Dimensions and Clearances figure for information  
concerning side and bottom supply and return air duct openings.  
FIG. 3 - FIXED OUTDOOR AIR DAMPER  
CONDENSATE DRAIN  
It is recommended that, in Canada, the outlet duct on gas  
heating units be provided with a removable access panel. It is  
recommended that this opening be accessible when the unit  
is installed in service, and of a size such that smoke or  
reflected light may be observed inside the casing to indicate  
the presence of leaks in the heat exchanger.The cover should  
be attached in a manner adequate to prevent leakage.  
Plumbing must conform to local codes. Use a sealing  
compound on male pipe threads.Install a condensate drain line  
from the 1" NPT female connection on the unit to an open drain.  
FIXED OUTDOOR AIR INTAKE DAMPER  
This damper is shipped inside the return air compartment on units  
that are not provided with an economizer or a motorized damper  
option. It is completely assembled and ready for installation. A  
damper baffle inside of the hood is adjustable to provide variable  
amounts of outdoor air intake.  
Gasketing and mounting screws are provided in a parts bag  
attached to the hood assembly. Apply gasketing to the three  
flange surfaces on the hood prior to installing the hood. Extend  
gasketing 1/4" beyond the top and bottom of the two side  
flanges to insure adequate sealing.  
FIG. 4 - RECOMMENDED DRAIN PIPING  
NOTE: The condensate drain line MUST be trapped to provide  
proper drainage.  
Adjusting the damper to the desired air flow may be done before  
mounting the hood into position or (after installation) by  
removing the front hood panel or the screen on the bottom of  
the hood. Damper baffle in position 1 will allow approximately  
10% recirculated air flow, position 2 approximately 15% and, to  
allow approximately 25%, remove the damper baffle.  
COMPRESSORS  
Units are shipped with compressor mountings factory-adjusted  
and ready for operation.  
CAUTION: Do Not loosen compressor mounting bolts.  
FILTERS  
On units with bottom return air applications, install the damper  
assembly over the opening in the side return air access panel.  
Remove and discard the opening cover and the covering over  
the hood mounting holes (used for shipping) before installing.  
Secure with the screws provided.  
2"filtersaresuppliedwith each unit.Filtersmust alwaysbeinstalled  
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 the Physical Data Table.  
SERVICE ACCESS  
Access to all serviceable components is provided by the  
following removable panels:  
On units with side return air applications, install the damper  
assembly on the return air ductwork as close to the unit as  
possible. Cut an opening 16" high by 18" wide in the ductwork  
to accommodate the damper. Using the holes in the hood  
flanges as a template, drill 9/64" dia. (#26 drill) holes into the  
ductwork and secure with the screws provided.  
• Compressor compartment  
• Electric Heat compartment - DCE models  
• Gas Heat compartment (Two panels) - DCG models  
• Side Supply & Return Air compartments (Two panels)  
• Blower compartment (Three panels)  
• Main control box  
CAUTION: If outdoor air intake will not be required on units  
with bottom return air applications, the damper  
assembly should stillbemountedonthesidereturn  
air access panel, per the instructions above, to  
insure moisture is not drawn into the unit during  
operation. The covering over the mounting holes  
only need be removed. Do not remove the opening  
cover.  
• Filter compartment  
• Outdoor Air compartment (Two panels)  
Refer to the Dimensions and Clearances figure for location of these  
access panels.  
CAUTION: Make sure that all screws and panel latches are  
replaced and properly positioned on the unit to  
maintain an air-tight seal.  
4
Unitary Products Group  
530.18-N11Y  
CONTROL WIRE SIZES  
Wire Size1 AWG. Gauge  
22  
25  
20  
40  
19  
18  
65  
16  
50  
100  
Maximum Wire Length2 Feet  
Notes:  
1. Solid, Class II copper wire  
FIG. 5 - TYPICAL FIELD WIRING  
Unitary Products Group  
5
530.18-N11Y  
THERMOSTAT  
COMBUSTION DISCHARGE (DCG Models)  
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. Seven color  
coded insulated wires should be used to connect thermostat to  
unit.  
The products of combustion are discharged horizontally  
through two screened (hooded) openings on the upper gas  
heat access panel.  
POWER AND CONTROL WIRING  
Field wiring to the unit must conform to provisions of the  
National Electrical Code, ANSI / NFPA No. 70 (in U.S.A.),  
current Canadian Electrical Code C22.1 (in Canada) and/or  
local ordinances. The unit must be electrically grounded in  
accordance with NEC and CEC (as specified above) and/or  
local codes. Voltage tolerances which must be maintained at  
the compressor terminals during starting and running  
conditions are indicated on the unit Rating Plate.  
The internal wiring harness furnished with this unit is an integral  
part of a ETL and CGA design certified unit. Field alteration to  
comply with electrical codes should not be required.  
FIG. 6 - EXTERNAL SUPPLY CONNECTION  
EXTERNAL SHUT-OFF  
A fused disconnect switch should be field provided for the unit.  
The switch must be separate from all other circuits. Wire entry  
at knockout openings require conduit fittings to comply with  
NEC (in U.S.A.), CEC (in Canada) and/or local codes. If any  
ofthe wire supplied withthe unit mustbereplaced, replacement  
wire must be of the type shown on the wiring diagram and the  
same minimum gauge as the replaced wire.  
Electrical line must be sized properly to carry the load. Each  
unit must be wired with a separate branch circuit fed directly  
from the meter panel and properly fused.  
GAS PIPING (DCG Models)  
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 (in U.S.A.) or 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 utility requirements. See Pipe Sizing table.  
The heating value of the gas may differ with locality. The value  
should be checked with the local gas utility.  
CAUTION: When connecting electrical power and control  
wiring 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.  
NOTE: There may be a local gas utility requirement specifying  
a minimum diameter for gas piping. All units require a  
1 inch pipe connection at the entrance fitting.  
TABLE 3 - PIPE SIZING  
Nominal Iron Pipe Size  
Length in Feet  
Refer to Typical Field Wiring Figure for typical field wiring and to  
the appropriate unit wiring diagram for control circuit and power  
wiring information.  
1 in.  
1-1/4 in.  
10  
20  
30  
40  
50  
60  
70  
80  
90  
100  
520  
350  
285  
245  
215  
195  
180  
170  
160  
150  
1,050  
730  
590  
500  
440  
400  
370  
350  
320  
305  
OPTIONAL ELECTRIC HEATERS (DCE Models)  
The factory installed heaters are wired for single point power  
supply.Power supply need only be brought into the single point  
terminal block and thermostat wiring to the low voltage terminal  
block located in the upper portion of the unit control box.  
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).  
These ETL and CGA approved heaters are located within the  
central compartment of the unit with the heater elements  
extending into the supply air chamber. Refer to the Dimension  
and Clearances figure for access panel location.  
GAS CONNECTION (DCG Models)  
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. Typical supply piping arrangements are  
shown in the Supply Connection figures. All pipe, fittings, etc.  
are field-supplied.  
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  
enters through the front of the unit.  
Fuses are supplied, where required, by the factory. Some KW  
sizes require fuses and others do not. Refer to the Unit  
Application Data Table 1 for minmum CFM limitations and to  
Electrical Data Table.  
TABLE 2 - GAS HEAT APPLICATION DATA  
Input Capacity (Mbh)  
Output Capacity (Mbh)  
Temp.  
Rise °F  
At  
After the gas supply piping has been installed, the bottom  
opening in the unit should be sealed to prevent water from  
leaking into the building.  
0 To  
2,000 To  
0 To 2,000 To  
Gas  
Rate2  
2,000 Feet  
Above  
Sea Level  
4,500 Feet 2,000 Feet 4,500 Feet  
Above Above Above  
Sea Level1 Sea Level Sea Level1  
Full Input 3  
(Ft.3/Hr.)  
Gas piping recommendations:  
Max. Min. Max. Min.  
Max.  
240  
Max.  
213  
Min.  
20  
Max.  
50  
1. A drip leg and a ground joint union must be installed in the  
gas piping.  
2. When required by local codes, a manual shut-off valve may  
have to be installed outside of the unit.  
3. Use wrought iron or steel pipe for all gas lines. Pipe com-  
pound should be applied sparingly to male threads only.  
300  
400  
150 270 135  
200 360 180  
279  
372  
320  
281  
30  
60  
NOTE: Heaters are shipped available for natural gas, but can be converted to  
L.P. / Propane with Kit Model No. 1NP0418.  
1
MBH rating should be reduced at the rate of 4 percent for each 1,000 feet above 4,500 feet.  
2
3
3
Based on maximum input and 1075 Btu/Ft .  
The air flow must be adjusted to obtain a temperature rise within the range shown.  
6
Unitary Products Group  
530.18-N11Y  
L.P. UNITS, TANKS AND PIPING (DCG Models)  
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  
1NP0418.  
All L.P./propane gas equipment must conform to the safety  
standards of the National Fire Protection Association.  
For satisfactory operation, L.P./propane gas pressure must be  
8.8 inch W.C at the unit under full load. Maintaining proper gas  
pressure depends on three main factors:  
FIG. 7 - BOTTOM SUPPLY CONNECTION  
1. The vaporization rate which depends on (a) the tempera-  
ture of the liquid and (b) the “wetted surface” area of the  
container or containers.  
EXTERNAL SHUT-OFF  
WARNING:Natural gas may contain some propane. Propane,  
being an excellent solvent, will quickly dissolve  
white lead or most standard commercial  
compounds. 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.  
2. The proper pressure regulation. (Two-stage regulation is  
recommended from the standpoint of both cost and effi-  
ciency.)  
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.  
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.  
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.  
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.  
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.  
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).  
Check all connections for leaks when piping is completed,  
using a soap solution. NEVER USE A FLAME.  
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).  
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.  
Unitary Products Group  
7
530.18-N11Y  
VENT AND COMBUSTION AIR HOODS  
(DCG Models)  
OPTIONAL ECONOMIZER/MOTORIZED DAMPER  
RAIN HOOD  
The instruction for the optional economizer/motorized damper  
rain hood can be found in form 44-320-2.Use these instructions  
when field assembling an economizer rain hood onto a unit.  
The outdoor and return air dampers, the damper actuator, the  
damper linkage, the outdoor and return air divider baffles, and  
all the control sensors are factory mounted as part of the  
"Factory installed" economizer option.  
Two vent hoods and a combustion air hood (with screens) are  
shipped attached to the blower housing in the blower  
compartment. These hoods must be installed to assure proper  
unit function. All hoods must be fastened to the outside of the  
gas heat access panel with the screws provided in the bag also  
attached to the blower housing.  
ENTHALPY SET POINT ADJUSTMENT  
The screen for the combustion air intake hood is secured to the  
inside of the access panel opening with four 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 the Vent and Combustion Hood figure.  
Remove the economizer access panel from the unit to check  
the following adjustments. Loosen but do not remove the two  
panel latches.  
Each vent hood is installed by inserting the top flange of the  
hood into the slotted opening in the access panel and securing  
in place.  
CAUTION: Extreme care must be exercised in turning both the  
setpoint and minimum position adjusting screws to  
prevent twisting them off.  
1. The enthalpy set point may now be set by selecting the  
desired setpoint shown in the Enthalpy figure. Adjust as  
follows:  
• For a single enthalpy operation, carefully turn the set  
point adjusting screw to the “A”, “B”, “C” or “D” setting  
corresponding to the lettered curve.  
• For a dual enthalpy operation, carefully turn the set point  
adjusting screw fully clockwise past the “D” setting.  
SLOTTED  
OPENINGS IN  
ACCESS PANEL  
VENT AIR  
OUTLET  
HOODS  
2. 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.  
3. Replace the economizer access panel. Reposition the two  
latches horizontally and retighten the screws.  
POWER EXHAUST/BAROMETRIC RELIEF DAMPER  
AND RAIN HOOD OPTION  
COMBUSTION  
AIR INTAKE  
HOOD  
GAS HEAT  
ACCESS  
PANELS  
The instructions for the power exhaust/barometric relief  
damper and rain hood can be found in form 44-320-10. The  
exhaust fan, all supporting brackets, angles, and the wiring are  
factory installed as part of the power exhaust option.  
All of the components, including the dampers, hardware, and  
mounting instructions are shipped in a single package external  
from the unit. The hood must be field assembled and installed.  
FIG. 8 - VENT AND COMBUSTION AIR HOODS  
Power exhaust is not available as a field installed option.  
8
Unitary Products Group  
530.18-N11Y  
FIG. 9 - ENTHALPY SETPOINT ADJUSTMENT  
Unitary Products Group  
9
530.18-N11Y  
TABLE 4 - PHYSICAL DATA  
DCE/DCG  
300  
18 x 15  
15  
OPERATING WEIGHTS (LBS.)  
DCE (Cooling only)  
25 TON  
2730  
2930  
MODELS  
CENTRIFUGAL BLOWER (Dia. x Wd. in.)  
FAN MOTOR HP  
ROWS DEEP  
FINS PER INCH  
FACE AREA (Sq. Ft.)  
PROPELLER DIA. (in.) (Each)  
FAN MOTOR HP  
NOM. CFM TOTAL  
ROWS DEEP  
DCG  
(Gas /  
Electric)  
N240  
EVAPORATOR  
BLOWER  
Basic Unit  
N320  
2970  
160  
4
EVAPORATOR  
COIL  
Economizer  
Economizer with  
Power Exhaust  
13.5  
25.0  
30  
1
7200  
3
245  
CONDENSER  
FAN  
(Two Per Unit)  
Motorized Damper  
150  
25  
30  
35  
40  
(Each)  
(Each)  
Options  
18 KW  
36 KW  
54 KW  
72 KW  
Electric  
Heater  
(DCE only)  
CONDENSER  
COIL  
FINS PER INCH  
FACE AREA (Sq. Ft.)  
15  
43.3  
Roof Curb  
Barometric Damper  
185  
45  
COMPRESSOR  
(Qty. Per Unit)  
12.5-TON TANDEM  
2
Economizer/Motorized  
Accessories Damper Rain Hood  
QUANTITY PER UNIT (16" X 20" X 2")  
QUANTITY PER UNIT (16" X 25" X 2")  
QUANTITY PER UNIT (14" X 20" X 2")  
TOTAL FACE AREA (sq. ft.)  
2
4
3
21.4  
20/8  
20/0  
55  
AIR  
FILTERS  
Economizer/Power Exhaust  
Rain Hood  
Wood Skid  
90  
220  
SYSTEM NO. 1  
SYSTEM NO. 2  
REFRIGERANT  
22 (lbs./oz.)  
CHARGE  
*This compressor will be energized first.  
TABLE 5 - ELECTRICAL DATA - BASIC UNITS  
COMPRESSORS  
COND. FAN  
(#1 & #2)  
SUPPLY AIR  
BLOWER MOTOR  
MINIMUM  
CIRCUIT  
MAXIMUM  
POWER  
SUPPLY  
(QTY. 2)  
OVERCURRENT  
MODEL NO.  
RLA  
LRA  
(ea.)  
HP  
(ea.)  
FLA  
(ea.)  
AMPACITY  
(AMPS)  
DEVICE (1)  
(AMPS)  
HP  
RLA  
(ea.)  
41.4  
20.0  
16.4  
D2CE300 208/230-3-60  
312  
140  
108  
1
1
1
4.2  
2.1  
2.0  
15  
15  
15  
38.6  
19.3  
15.4  
139.5  
68.3  
56.1  
175  
80  
70  
& D2CG300  
460-3-60  
575-3-60  
VOLTAGE  
POWER SUPPLY  
MIN.  
187  
414  
518  
MAX.  
253  
VOLTAGE  
LIMITATIONS**  
208/230-3-60  
460-3-60  
506  
575-3-60  
630  
**Utilization Range “A” in accordance with ARI Standard 110.  
TABLE 6 - ELECTRICAL DATA - UNITS w/ELECTRIC HEAT  
MINIMUM  
CIRCUIT  
MAXIMUM  
ELECTRIC HEATER OPTION  
MODEL  
D2CE  
POWER  
SUPPLY  
OVERCURRENT  
DEV ICE (1)  
A MPA CITY  
MODEL  
kW(1)  
STAGES AMPS  
(AMPS)  
139.5  
142.1  
189.0  
198.4  
139.5  
156.5  
178.2  
221.5  
68.3  
(AMPS)  
175  
175  
200  
225  
175  
175  
200  
250  
80  
300A25  
300A25  
300A25  
300A25  
300A25  
300A25  
300A25  
300A25  
300A46  
300A46  
300A46  
300A46  
300A58  
300A58  
300A58  
300A58  
208-3-60  
208-3-60  
208-3-60  
208-3-60  
230-3-60  
230-3-60  
230-3-60  
230-3-60  
460-3-60  
460-3-60  
460-3-60  
460-3-60  
575-3-60  
575-3-60  
575-3-60  
575-3-60  
E018  
E036  
E054  
E072  
E018  
E036  
E054  
E072  
E018  
E036  
E054  
E072  
E018  
E036  
E054  
E072  
13.5  
27.0  
40.6  
54.1  
18.0  
36.0  
54.0  
72.0  
18.0  
36.0  
54.0  
72.0  
18.0  
36.0  
54.0  
72.0  
1
2
2
2
1
2
2
2
1
2
2
2
1
2
2
2
37.5  
75.1  
112.6  
150.1  
43.3  
86.6  
129.9  
173.2  
21.7  
43.3  
65.0  
86.6  
17.3  
34.6  
52.0  
69.3  
78.3  
80  
89.1  
100  
125  
70  
110.7  
56.1  
62.6  
71.2  
70  
80  
88.5  
100  
NOMINAL VOLTAGE  
VOLTAGE  
208  
KW CAP. MULTIPLIER  
208  
240  
480  
600  
1.00  
0.92  
0.92  
0.92  
230  
460  
575  
10  
Unitary Products Group  
530.18-N11Y  
E
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All dimensions are in inches. They are sub-  
ject to change without notice. Certified di-  
mensions will be provided upon request.  
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5
2
-
5
/
8
"
RETURN AIR  
SUPPLY AIR  
D
(
D
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2
1
"
5
"
1
3
6
-
1
/
4
"
CONDENSER AIR  
F
V
R
O
N
T
9
-
3
/
4
"
E
A
L
C
E
C
T
R
I
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E
A
T
9
2
"
I
E
W
C
E
S
S
(
C
E
A
)
OUTDOOR AIR  
(Economizer)  
5
-
7
/
8
"
O
N
T
R
O
L
W
I
R
I
N
G
C
A
O
N
T
R
O
L
B
O
X
N
T
R
Y
C
C
E
S
S
1
1
-
1
/
2
"
(
P
E
B
)
3
5
"
B
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T
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P
P
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N
I
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G
(
S
e
e
N
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e
)
3
5
-
1
/
4
"
R
E
T
U
R
N
3
-
3
/
4
"
A
I
R
3
3
"
S
U
P
P
L
Y
A
I
R
UTILITIES ENTRY DATA  
2
-
3
/
2
4
1
"
-
1
/
2
"
OPENING  
SIZE  
(DIA.)  
HOLE  
A
USED FOR  
U
S
B
C
N
I
T
B
A
S
E
W
I
T
H
R
A
I
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S
(
P
E
B
A
)
)
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T
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R
R
Y
Y
1-1/8" KO  
3/4" NPS (Fem.)  
3-5/8" KO  
3" NPS (Fem.)  
2-3/8" KO  
Front  
Bottom  
Front  
Control  
Wiring  
o
n
n
e
c
t
i
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W
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G
8
-
1
/
8
"
N
N
F
d
s
O
T
E
:
Power  
Wiring  
B
C
o
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r
b
m
o
u
n
t
e
d
u
n
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t
s
,
r
e
f
e
r
t
o
p
t
h
e
c
u
r
b
z
h
a
n
g
e
r
9
-
1
h
/
4
"
Bottom  
i
m
e
p
n
s
i
o
n
n
s
o
f
t
h
e
c
u
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b
f
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t
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r
o
p
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s
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o
f
t
h
e
1
2
-
1
/
2
"
9
-
3
/
4
"
u
p
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y
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t
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n
a
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d
u
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.
Gas Piping (Front)  
D
1-11/16" Hole Gas Piping (Bottom)*  
E
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D
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A
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E
A
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D
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S
S
*Opening in the bottom of the unit can be located by the slice  
F
D
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L
D
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S
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P
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D
W
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l
"
Y
"
)
in the insulation.  
O
C
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C
A
(
O
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P
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S
S
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A
(
L
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l
"
X
"
)
O
M
P
A
R
T
M
E
N
T
C
E
S
S
L CLEARANCES  
O
C
P
T
I
O
N
A
A
u
x
i
l
i
a
r
y
)
O
I
L
G
U
A
R
D
Front  
36"  
D
(
D
O
r
T
P
L
U
G
F
o
r
p
r
e
s
s
u
r
e
5
2
-
5
/
8
24" (Less Economizer)  
49" (With Economizer)  
o
p
R
e
a
d
i
n
T
g
)
Back  
G
A
A
S
H
E
A
24" (Less Economizer)  
C
C
E
S
S
Left Side (Filter Access)  
36"3(With Economizer)  
C
C
O
O
N
I
D
E
N
S
E
R
V
O
H
E
N
T
A
I
R
L
S
U
T
O
L
E
T
Right Side (Cond. Coil)  
Below Unit1  
36"  
20"  
O
D
S
2
1
"
5
"
7
-
1
/
8
"
C
A
H
O
O
M
O
B
U
S
T
I
O
N
1
3
6
-
1
/
4
I
R
I
N
L
E
T
72" With 36" Maximum  
Horizontal Overhang  
(For Condenser Air  
Discharge)  
D
6
-
3
/
8
"
Above Unit2  
9
-
3
/
4
"
9
2
"
(
G
E
C
)
5
-
7
/
8
"
(
C
E
A
)
A
S
S
U
P
P
L
Y
O
N
T
R
O
L
W
I
R
I
N
G
N
T
R
Y
1
N
T
R
Y
4
6
-
5
/
8
"
Units (applicable in U.S.A. only) may be installed on combustible floors  
made from wood or class A, B or C roof covering material.  
C
A
O
N
T
R
O
L
B
O
X
1
1
-
1
/
2
"
(
P
E
B
)
3
5
"
C
C
E
S
S
2
O
N
W
E
R
W
I
R
N
G
I Units must be installed oudoors. Overhanging structures or shrubs should  
B
O
T
T
O
M
S
U
P
P
L
Y
T
R
Y
not obstruct condenser air discharge outlet.  
If economizer is factory installed, the assembled hood kit must be removed  
prior to final installation. This hood is 54" long.  
A
N
D
R
E
T
U
R
N
3
A
I
R
O
P
E
N
I
N
G
S
F
V
R
O
N
T
(
S
e
e
N
o
t
e
)
3
5
-
1
/
4
I
E
W
R
E
T
U
R
N
3
-
3
/
4
"
A
I
R
NOTE:  
3
3
"
DCE Models: Units and ductwork are approved for zero clearance to combus-  
tible materials when equipped with electric heaters.  
S
U
P
P
L
Y
A
I
R
2
-
3
/
2
4
1
"
-
1
/
2
"
DCG Models: A 1" clearance must be provided between any combustible  
material and the supply air ductwork for a distance of 3 feet from the unit.  
1
1
-
1
/
8
"
The products of combustion must not be allowed to accumulate within a  
confined space and recirculate.  
G
U
N
I
T
B
A
S
E
W
I
T
H
R
A
I
L
S
(
P
E
B
A
)
)
(
G
E
D
)
S
B
a
l
h
o
o
t
w
n
s
e
p
a
r
a
t
e
l
y
n
t
n
o
i
l
l
u
s
t
r
a
t
e
O
N
W
E
R
W
I
R
I
N
A
S
S
U
P
P
L
Y
t
o
m
D
u
c
t
o
p
e
i
g
s
,
P
o
w
n
e
r
T
T
R
R
Y
Y
N
T
R
Y
Locate unit so that the vent air outlet hood is at least:  
n
d
G
a
s
P
i
p
i
n
g
C
o
n
n
e
c
t
i
o
(
C
E
o
c
a
t
i
o
n
s
• Three (3) feet above any forced air inlet located within 10 horizontal feet  
O
N
T
R
O
L
W
I
R
I
N
G
8
-
1
/
8
"
N
(excluding those integral to the unit).  
N
F
d
s
O
T
E
:
4
6
-
5
/
8
"
o
r
c
u
r
b
m
o
u
n
t
e
d
u
n
i
t
s
,
r
e
f
e
r
t
o
p
t
h
e
c
u
r
b
z
h
a
n
g
e
r
• Four (4) feet below, 4 horizontal feet from, or 1 foot above any door or gravity  
9
-
1
h
/
4
"
i
m
e
p
n
s
i
o
n
n
s
o
f
t
h
e
c
u
r
b
f
o
r
t
e
r
o
p
e
r
s
i
e
o
f
t
h
e
air inlet into the building.  
1
2
-
1
/
2
"
9
-
3
/
4
"
u
p
l
y
a
d
r
e
t
u
r
n
a
i
r
d
u
c
t
c
o
n
n
e
c
t
i
o
n
s
.
• Four (4) feet from electric meters, gas meters, regulators and relief equip-  
ment.  
Cont’d.  
FIG. 10 - DIMENSIONS & CLEARANCES - DCE & DCG  
Unitary Products Group  
11  
530.18-N11Y  
CONDENSER  
SECTION  
EVAPORATOR  
SECTION  
GAUGE LINE  
ACCESS  
DUCT COVERS - Units are shipped with the bottom  
duct openings covered. An accessory flange kit is avail-  
able for connecting side ducts.  
DOT PLUG  
(For pressure  
drop reading)  
For bottom duct applications:  
40-3/8"  
1. Remove the side panels from the supply and return  
air compartments to gain access to the bottom  
supply and return air duct covers.  
FILTER  
ACCESS  
2. Remove and discard the bottom duct covers. (Duct  
openings are closed with sheet metal covers except  
when the unit includes a power exhaust option. The  
covering consists of a heavy black paper composition.)  
3. Replace the side supply and return air compartment  
panels.  
SUPPLY  
AIR  
RETURN  
AIR  
5-1/2"  
COMPRESSOR  
ACCESS  
OUTDOOR  
AIR  
For side duct applications;  
40-1/2"  
SUPPLY AIR  
ACCESS  
1. Replace the side panels on the supply and return air  
compartments with the accessory flange kit panels.  
2. Connect ductwork to the duct flanges on the rear of  
the unit.  
18-5/8"  
1" NPT FEMALE  
COND. DRAIN  
CONNECTION  
27-3/4"  
5-1/8"  
RETURN AIR  
ACCESS  
OUTDOOR AIR  
COMPARTMENT  
ACCESS  
39-5/8  
REAR  
VIEW  
DETAIL “X”  
ACCESSORY SIDE SUPPLY AND RETURN AIR OPENINGS  
ECONOMIZER  
MOTORIZED  
DAMPER  
RAIN HOOD  
(on Outdoor Air Compartment)  
POWER EXHAUST  
RAIN HOOD  
(on Return Air Compartment)  
SUPPLY AIR  
COMPARTMENT  
ECONOMIZER MOTORIZED DAMPER  
/
AND POWER EXHAUST RAIN HOODS  
FIXED  
OUTDOOR AIR  
INTAKE HOOD  
(located on  
Return Air  
34-1/4"  
Compartment)  
1" CONDENSTATE  
DRAIN  
16-1/8"  
(Must be trapped)  
5"  
36"  
92"  
36-1/4"  
2"  
66-1/2"  
LH VIEW  
REAR VIEW  
DETAIL "Y"  
UNIT WITH RAIN HOODS  
DETAIL “Y”  
UNIT WITH RAIN HOODS  
FIG. 10 - DIMENSIONS & CLEARANCES (Cont’d.)- DCE & DCG  
12  
Unitary Products Group  
530.18-N11Y  
B
E
F
C
D
A
A
C
FRONT  
FRONT  
4 POINT LOADS  
6 POINT LOADS  
D
B
FIG. 11- FOUR AND SIX POINT LOADS  
TABLE 7 - FOUR AND SIX POINT LOADS  
4 - POINT LOADS (LBS)  
UNIT  
TOTAL  
3,130  
A
615  
B
671  
C
D
300  
962  
882  
NOTE: These weights are with economizer, high heat, and the largest blower motor available.  
6 - POINT LOADS (LBS)  
UNIT  
TOTAL  
3,130  
A
B
C
D
628  
E
603  
F
510  
300  
418  
438  
533  
NOTE: These weights are with economizer, high heat, and the largest blower motor available.  
DCE300 - BOTTOMDUCTCONNECTIONS(COOLING APPLICATIONS)  
TABLE 8 - SUPPLY AIR BLOWER PERFORMANCE  
7500 CFM  
OUTPUT  
(bhp)  
8750 CFM  
OUTPUT  
(bhp)  
10000 CFM  
OUTPUT  
(bhp)  
11250 CFM  
OUTPUT  
(bhp)  
12500 CFM  
OUTPUT  
(bhp)  
BLOWER PULLEY  
SPEED  
(rpm)  
TURNS  
OPEN:  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
STANDARD DRIVE:  
975  
6.0*  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
1.4  
1.6  
1.8  
2.0  
2.1  
2.4  
2.6  
5.9  
6.2  
6.6  
6.9  
7.3  
7.7  
8.0  
4.9  
5.1  
5.4  
5.7  
6.0  
6.3  
6.6  
1.0  
1.2  
1.4  
1.6  
1.8  
2.0  
2.2  
7.3  
7.7  
8.1  
8.5  
8.9  
9.3  
9.7  
6.0  
0.5  
0.7  
0.9  
1.1  
1.3  
1.6  
1.8  
8.8  
9.2  
9.7  
10.2  
10.6  
11.1  
11.6  
7.2  
7.6  
8.0  
8.3  
8.7  
9.1  
9.5  
-
-
-
-
-
-
-
-
-
-
-
-
1005  
1040  
1070  
1100  
1135  
1165  
6.3  
6.7  
7.0  
7.3  
7.6  
8.0  
0.1  
0.3  
0.6  
0.8  
1.0  
1.3  
10.9  
11.4  
11.9  
12.4  
13.0  
13.5  
8.9  
9.4  
9.8  
10.2  
10.6  
11.0  
-
-
-
0.2  
0.4  
0.7  
14.3  
14.9  
15.5  
11.7  
12.2  
12.7  
ACCESSORY DRIVE:  
1140  
1180  
1215  
1255  
1290  
1330  
1365  
NOTES:  
6.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
2.4  
2.7  
2.9  
3.2  
3.4  
3.7  
3.9  
7.7  
8.2  
8.6  
9.1  
9.5  
10.0  
10.5  
6.3  
6.7  
7.0  
7.4  
7.8  
8.2  
8.6  
2.1  
2.3  
2.6  
2.9  
3.1  
3.4  
3.7  
9.4  
9.9  
7.7  
8.1  
8.5  
9.0  
9.4  
9.9  
10.3  
1.6  
1.9  
2.2  
2.5  
2.7  
3.0  
3.3  
11.2  
11.8  
12.3  
12.9  
13.5  
14.1  
14.7  
9.2  
9.7  
1.1  
1.4  
1.7  
2.0  
2.2  
2.6  
2.9  
13.1  
13.7  
14.3  
15.0  
15.6  
16.4  
17.0  
10.7  
11.2  
11.7  
12.3  
12.8  
13.4  
13.9  
0.5  
0.8  
1.1  
1.4  
-
-
-
15.0  
15.8  
16.4  
17.2  
-
-
-
12.3  
12.9  
13.5  
14.1  
-
-
-
10.4  
11.0  
11.5  
12.0  
12.6  
10.1  
10.6  
11.1  
11.6  
12.1  
Blower performance is based on cooling only unit, with fixed outdoor air, 2" T/A filters and a dry evaporator coil.  
Refer to page 14 for additional static resistances.  
ESP - External Static Pressure available for the supply and return air duct system. All internal unit resistances have been deducted from the total static pressure of the  
blower.  
* FACTORY SETTING  
Unitary Products Group  
13  
530.18-N11Y  
TABLE 9 - SUPPLY AIR BLOWER PERFORMANCE DCG300-BOTTOM DUCT CONNECTIONS(COOLING APPLICATIONS)  
7500 CFM  
OUTPUT  
(bhp)  
8750 CFM  
OUTPUT  
(bhp)  
10000 CFM  
OUTPUT  
(bhp)  
11250 CFM  
OUTPUT  
(bhp)  
12500 CFM  
OUTPUT  
(bhp)  
BLOWER PULLEY  
SPEED  
(rpm)  
TURNS  
OPEN:  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
ESP  
(iwg)  
INPUT  
(kW)  
STANDARD DRIVE:  
975  
6.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
1.2  
1.4  
1.6  
1.8  
2.0  
2.2  
2.4  
5.9  
6.2  
6.6  
6.9  
7.3  
7.7  
8.0  
4.9  
5.1  
5.4  
5.7  
6.0  
6.3  
6.6  
0.5  
0.7  
0.9  
1.1  
1.3  
1.6  
1.8  
7.3  
7.7  
8.1  
8.5  
8.9  
9.3  
9.7  
6.0  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1005  
1040  
1070  
1100  
1135  
1165  
6.3  
6.7  
7.0  
7.3  
7.6  
8.0  
0.2  
0.4  
0.6  
0.8  
1.0  
9.7  
8.0  
8.3  
8.7  
9.1  
9.5  
10.2  
10.6  
11.1  
11.6  
-
0.2  
13.5  
11.0  
ACCESSORY DRIVE:  
1140  
1180  
1215  
1255  
1290  
1330  
1365  
NOTES:  
6.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
2.2  
2.5  
2.7  
3.0  
3.2  
3.5  
3.7  
7.7  
8.2  
8.6  
9.1  
9.5  
10.0  
10.5  
6.3  
6.7  
7.0  
7.4  
7.8  
8.2  
8.6  
1.6  
1.9  
2.1  
2.4  
2.7  
3.0  
3.2  
9.4  
9.9  
7.7  
8.1  
8.5  
9.0  
9.4  
9.9  
10.3  
0.9  
1.2  
1.4  
1.7  
2.0  
2.3  
2.6  
11.2  
11.8  
12.3  
12.9  
13.5  
14.1  
14.7  
9.2  
9.7  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0.3  
0.6  
0.9  
1.2  
1.5  
1.8  
13.7  
14.3  
15.0  
15.6  
16.4  
17.0  
11.2  
11.7  
12.3  
12.8  
13.4  
13.9  
10.4  
11.0  
11.5  
12.0  
12.6  
10.1  
10.6  
11.1  
11.6  
12.1  
Blower performance is based on cooling only unit, with fixed outdoor air, 2" T/A filters and a dry evaporator coil.  
Refer to page 14 for additional static resistances.  
ESP - External Static Pressure available for the supply and return air duct system. All internal unit resistances have been deducted from the total static pressure of the  
blower.  
* FACTORY SETTING  
TABLE 10 - STATIC RESISTANCES*  
AIRFLOW (CFM)  
7500  
ESP  
8750  
ESP  
10000  
ESP  
11250  
ESP  
12500  
ESP  
DESCRIPTION  
(IWG)  
(IWG)  
(IWG)  
(IWG)  
(IWG)  
DEDUCTIONS: (SUBTRACT VALUES BELOW FROM UNIT'S AVAILABLE ESP)  
ALLOWANCE FOR WET COIL:  
ECONOMIZER (RETURN DUCT):  
18kW ELECTRIC HEAT:  
0.10  
0.06  
0.31  
0.38  
0.62  
0.68  
0.10  
0.09  
0.43  
0.52  
0.84  
0.93  
0.10  
0.11  
0.56  
0.68  
1.10  
1.21  
0.10  
0.14  
0.71  
0.87  
1.39  
1.54  
0.10  
0.18  
0.87  
1.07  
1.72  
1.90  
36kW ELECTRIC HEAT:  
54kW ELECTRIC HEAT:  
72kW ELECTRIC HEAT:  
ADDITIONS: (ADD VALUES BELOW TO UNIT'S AVAILABLE ESP)  
HORIZONTAL (SIDE) SUPPLY DUCT:  
HORIZONTAL (SIDE) RETURN DUCT:  
0.31  
0.05  
0.26  
0.05  
0.27  
0.05  
0.31  
0.05  
0.41  
0.05  
TABLE 11 - POWER EXHAUST PERFORMANCE  
STATIC RESISTANCE OF RETURN DUCTWORK, IWG  
0.3 0.4 0.5  
MOTOR  
SPEED  
0.2  
0.6  
CFM  
5250  
KW  
CFM  
KW  
CFM  
KW  
CFM  
KW  
CFM  
3000  
KW  
HIGH*  
0.83  
4500  
0.85  
4200  
0.88  
3750  
0.93  
0.99  
MEDIUM  
4900  
4400  
0.77  
0.72  
3900  
3700  
0.79  
0.74  
3500  
3000  
0.82  
0.78  
2900  
-
0.85  
-
-
-
-
-
LOW  
*Factory Setting  
Power Exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.  
TABLE 12 - BLOWER MOTOR AND DRIVE DATA  
BELT  
(NOTCHED)  
MOTOR1  
ADJUSTABLE MOTOR PULLEY  
FIXED BLOWER PULLEY  
OUTSIDE PITCH  
BLOWER  
DRIVE RANGE  
(RPM)  
MODEL  
SIZE  
OUT-  
PITCH  
PITCH  
LENGTH  
(IN.)  
EFF.  
(%)  
DESIG-  
NATION  
SIDE  
DIA.  
(IN.)  
BORE DESIG-  
(IN.) NATION  
BORE DESIG-  
QTY.  
HP FRAME  
DIA.  
(IN.)  
DIA.  
(IN.)  
DIA.  
(IN.)  
(IN.) NATION  
Stan-  
975/1165  
dard  
1B5V110 11.3  
11.1 1-7/16 5VX860 86.0  
9.5 1-7/16 5VX840 84.0  
1
1
6.2-  
7.4  
25 TON  
15 254T  
91 1LVP58B70A 7.5  
1-5/8  
High  
Speed 1140/1365  
Access  
1B5V94  
9.7  
1
All motors have a nominal speed of 1800 RPM, a 1.15 service factor and a solid base. They can operate to the limit of their service factor because they are located in the moving air, upstream  
of any heating device.  
14  
Unitary Products Group  
530.18-N11Y  
OPERATION  
addition. The power exhaust motor is energized whenever the  
economizer is chosen by the enthalpy sensor for first stage  
cooling, “Y1". As always, the ”R" to “G” connection provides  
minimum position but does not provide power exhaust  
operation.  
MOTORIZED OUTDOOR AIR DAMPERS - This system  
operation is the same as the units with no outdoor air options  
with one exception. When the “R” to “G” circuit is complete, the  
motorized damper drives open to a position set by the damper  
motor adjustment. When the “R” to “G” circuit is opened, the  
damper spring returns fully closed.  
COOLING SYSTEM  
The cooling section is a complete factory package utilizing an  
air-cooled condenser. The system is factory-charged with  
Refrigerant-22.  
The compressors are hermetically sealed, internally sprung  
and base-mounted with rubber-insulated hold-down bolts.  
Compressors have inherent (internal) protection. If there is an  
abnormal temperature rise in a compressor, the protector will  
open to shut down the compressor.  
PRELIMINARY OPERATION COOLING  
CONTINUOUS BLOWER - Continuous blower operation is  
possible by closing the R to G circuit on the thermostat.  
After the initial installation, the compressors should be given  
three false starts (energized just long enough to make a few  
revolutions) with 5-7 minutes delay between each start, before  
being put into full time service.  
SAFETY CONTROLS  
Each refrigerant system is equipped with the following safety  
controls:  
COOLING SEQUENCE OF OPERATION  
NO OUTDOOR AIR OPTIONS - When the room thermostat  
calls for “first-stage”cooling, the low voltage control circuit from  
“R” to “G” and “Y1" is completed to energize compressors #1/2  
(50% capacity), condenser fan motor #1, and the supply air  
blower motor (if the fan switch on the room thermostat is set in  
the ”AUTO" position).  
When the thermostat calls for “second-stage” cooling, the low  
voltage control circuit from “R” to “Y2" is completed to energize  
compressor #3/4.  
After the thermostat is satisfied and opens, all components will  
stop simultaneously. The blower motor will continue to operate  
if the fan switch on the room thermostat is set in the “ON”  
position.  
1. A Suction Line Freezestat to protect against low evaporator  
temperatures due to a low air flow or a low return air  
temperature. (Opens at 26°F + 5°F and resets at 38°F +  
5°F)  
2. A High Pressure Cutout Switch to protect against excessive  
discharge pressures due to a blocked condenser coil or a  
condenser motor failure.(Opens at380 psig +10and resets  
at 300 psig +10)  
3. A Low Pressure Switch/Loss Of Charge to protect against  
loss of refrigerant charge. (Opens at 7 psig + 3 and resets  
at 22 psig + 5)  
ECONOMIZER WITH SINGLE ENTHALPY SENSOR - When  
the room thermostat calls for “first-stage” cooling, the low  
voltage control circuit from “R” to “G” and “Y1" is completed.  
The ”R" to “G” circuit energizes the blower motor (if the fan  
switch on the room thermostat is set in the “AUTO” position)  
and drives the economizer dampers from fully closed to their  
minimum position.If the enthalpy of the outdoor air is below the  
setpoint of the enthalpy controller (previously determined), “Y1"  
energizes the economizer. The dampers will modulate to  
maintain a constant supply air temperature as monitored by the  
discharge air sensor. If the outdoor air enthalpy is above the  
setpoint, ”Y1" energizes compressors #1/2, and condenser fan  
motor #1.  
When the thermostat calls for “second-stage” cooling, the low  
voltage control circuit from “R” to “Y2" is completed. If the  
enthalpy of the outdoor air is below the setpoint of the enthalpy  
controller (i.e. first stage has energized the economizer), ”Y2"  
will energize compressors #1/2. If the outdoor air is above the  
setpoint, “Y2" will energize compressor #3/4.  
If either one of the above safety controls opens, that individual  
refrigerant system will be locked out. The other refrigerant  
system will continue in operation unless it too is effected by the  
same fault. The lock out of either system can be reset by  
opening the 24V circuit either at the room thermostat or at the  
unit disconnect.  
ELECTRIC HEATING - SEQUENCE OF OPERATION  
WITH POWER TO UNIT AND THERMOSTAT IN THE  
HEATING MODE  
Single-stage heating: (applies only to 18 KW heater, all other  
heaters MUST use a two-stage thermostat:)  
a) If the fan switch is in the “ON” position, the evaporator  
blower motor contactor (3M) will be energized through  
terminal G to provide continuous blower operation.If the fan  
switch is in the “AUTO”position, the blower will operate only  
when there is a call for heating by the thermostat.  
NOTE: All 240 & 480V heaters are provided with manual  
reset backup protection limits. These will de-ener-  
gize the heaters should the primary limit fail to open  
or the contactors fail to open in a failure mode.  
After the thermostat is satisfied and opens, all components will  
stop simultaneously. The blower motor will continue to operate  
if the fan switch on the room thermostat is set in the “ON”  
position.  
b) Upon a call for heat by the thermostat, the heater contactor  
(6M) will be energized.  
c) The thermostat will cycle the electric heat to satisfy the  
heating requirements of the conditioned space.  
ECONOMIZER WITH DUAL ENTHALPY SENSORS - The  
operation with the dual enthalpy sensors is identical to the  
single sensor except that a second enthalpy sensor is mounted  
in the return air. This return air sensor allows the economizer  
to choose between outdoor air and return air, whichever has  
the lowest enthalpy value, to provide maximum operating  
efficiency.  
Two-stage heating: (applies to all heaters except 18 KW):  
a) If the fan switch is in the “ON” position, the evaporator  
blower motor contactor (3M) will be energized through  
terminal G to provide continuous blower operation.If the fan  
ECONOMIZER (SINGLE OR DUAL) WITH POWER  
EXHAUST - This system operates as specified above with one  
Unitary Products Group  
15  
530.18-N11Y  
switch is in the “AUTO”position, the blower will operate only  
At the same time power was supplied to the “RW1”, a parallel  
circuit activates “ETD” which closes the “ETD” contact after  
approximately 35 seconds and energizes “K5" which closes  
”K5-2" and starts the blower by energizing “3M”.  
When “TH2" closes, heat relay ”RW2" is energized. The  
“RW2-1" contact is closed energizing the second stage ignition  
module ”IC2". “IC2" will immediately start the second stage  
ignitor sparking and will open the redundant valve located  
inside the second stage main gas valve ”GV2" to allow a flow  
of gas to the second stage carryover tube. Only after the pilot  
flame has been ignited and the presence of pilot flame detected  
at “IC2" by a signal sent back through the flame sensor is  
sparking terminated and the main gas valve opened.  
Gas flows into each of the second stage main burners and is  
ignited from the carryover tube flame.  
If “IC2" fails to detect a pilot flame, it will continue to try for a  
maximum of 85 seconds to ignite the pilot tube.If the pilot flame  
is not detected, then ”IC2" will lock out furnace operation for 5  
minutes, then retry ignition sequence. Note that the second  
stage furnace can operate even if first stage has locked out.  
when there is a call for heating by the thermostat.  
b) Upon a call for first-stage heat by the thermostat, the heater  
contactor (6M) (6M & 7M on 72 KW, 240V) will be  
energized.  
If the second stage of heat is required, heater contactor  
(7M) will be energized. Note that on the 54 KW, 240V  
heater, heater contactors (7M & 8M) will be energized and  
on the 72 KW, 240V heater, heater contactors (8M & 9M)  
TABLE 9 - HEAT ANTICIPATOR SETTING  
SETTING, AMPS  
HEATER  
KW  
VOLTAGE  
TH1  
TH2  
-
18  
36  
54  
72  
18  
36  
54  
72  
18  
36  
54  
72  
0.29  
0.29  
0.29  
0.58  
0.29  
0.29  
0.29  
0.29  
0.29  
0.29  
0.29  
0.29  
0.29  
0.58  
0.58  
-
208/230-3-60  
0.29  
0.29  
0.29  
-
460-3-60  
575-3-60  
When the heating cycle is complete, “TH2" opens de-energizing  
the ”RW2" then “TH1" opens de-energizing ”RW1" and “ETD”,  
REDUNDANT  
VALVE  
MAIN VALVE  
0.29  
0.29  
0.29  
GAS MAIN  
will be energized.  
c) The thermostat will cycle the electric heat to satisfy the  
heating requirements of the conditioned space.  
GAS  
VALVE  
TO MAIN  
BURNER  
TO PILOT BURNER  
FIG. 12 - GAS VALVE PIPING  
HEAT ANTICIPATOR SETPOINTS  
It is important that the anticipator setpoint be correct. Too high of  
a setting will result in longer heat cycles and a greater temperature  
swing in the conditioned space. Reducing the value below the  
correct setpoint will give shorter “ON” cycles and may result in the  
lowering of the temperture within the conditioned space. Refer to  
the Heat Anticipator Setpoints table for the required .  
thus closing all gas valves. The blower motor will continue to  
run (approximately 45 seconds after the furnace is shut down)  
until “ETD” opens, de-energizing the “K5" relay and ”3M"  
contactor. The draft motor will continue to run for a brief  
post-purge cycle.  
SAFETY CONTROLS  
The control circuit includes the following safety controls:  
GAS HEATING SEQUENCE OF OPERATION  
The following sequence describes the operation of the gas heat  
section.  
1. LimitControl(LS).Thiscontrolislocatedinsidetheheatexchanger  
compartment and is set to open at the temperature indicated in  
the Limit Control Setting Table. It resets automatically. The limit  
switch operates when a high temperature condition, caused by  
inadequate supply air flow occurs, thus shutting down the ignition  
controland closingthe maingas valvesandenergizingtheblower.  
2. Centrifugal Switch (CS). If the draft motor should fail, the  
centrifugal switch attached to the shaft of the motor prevents  
the ignition controls and gas valves from being energized.  
3. Redundant Gas Valve. There are two separate gas valves  
in the furnace.Each valve contains a main and a redundant  
valve. The redundant valves are located upstream of the  
main gas valves. Should either or both of the main gas  
valves fail in the open position the redundant valves serve  
as back-ups and shuts off the flow of gas.  
4. Flame Sensor Rod / 100% Ignition Control Lock-Out. If an  
ignition control fails to detect a signal from the flame sensor  
indicating the pilot flame is properly ignited, then the main  
gas valve will not open. It will continue to try and ignite the  
pilot for a maximum of 85 seconds, then if the pilot flame is  
not detected, the ignition control will lock out furnace  
operation until 24V power is removed from the module  
either at the unit or by resetting the room thermostat.  
CONTINUOUS BLOWER  
With the room thermostat switch set to “ON”, the supply air  
blower will operate continuously. The normally closed contact  
“K5-1" provides 24 volt power to the “3M”contactor.The “3M-1,  
2 & 3" power contacts close and the blower motor operates.  
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 time delay  
relay closes.  
The “TH1" closes, the heat relay ”RW1" is energized. The “RW1-1”  
power contact closes energizing the line voltage draft motor. The  
“RW1-2" contact is also closed. As the speed of the draft motor  
reaches approximately 2500 RPM, the centrifugal switch contact  
located on the end of the draft motor shaft closes to power the first  
stage ignition module “IC1”.  
After a brief pre-purge time, ignition module “IC1" will start the first  
stage ignitor sparking and will open the redundant valve located  
inside the first stage main gas valve “GV1”to allow a flow of gas to  
only the first stage carryover tube. Only after the pilot flame has  
been ignited and the presence of pilot flame detected at the “IC1”  
by a signal sent back through the flame sensor is sparking  
terminated and the first stage main gas valve opened.  
5. Rollout Switch. This switch is located above the main burn-  
ers in the control compartment which in the event of a  
sustained main burner rollout shuts off and locks out both  
ignition controls closing both gas valves. The ignition con-  
trols lock out furnace operation until 24V power is removed  
from the controls either at the unit or by resetting the room  
thermostat. Note the auto reset rollout switch must reset  
before allowing furnace operation.  
Gas flows into each of the main burners and is ignited from  
the carryover tube flame.  
If “IC1”fails to detect a pilot flame, it will continue to try for a maximum  
of 85 seconds to ignite the pilot tube. If the pilot flame is not detected,  
then “IC1" will lock out furnace operation for 5 minutes, then retry  
ignition sequence.  
16  
Unitary Products Group  
530.18-N11Y  
TABLE 10 - LIMIT CONTROL SETTING  
Capacity, MBH  
Limit Control  
Opens, °F  
195  
I
G
N
.
C
O
N
T
R
O
L
#
2
Input  
300  
Output  
240  
400  
320  
195  
I
G
N
.
C
O
N
T
R
O
L
#
1
HEAT ANTICIPATOR SETPOINTS  
It is important that the anticipator setpoint be correct. Too high of  
a setting will result in longer heat cycles and a greater  
temperature swing in the conditioned space. Reducing the value  
below the correct setpoint will give shorter “ON” cycles and may  
result in the lowering of the temperture within the conditioned  
space.  
R
O
L
L
O
U
T
S
W
.
G
V
1
S
E
N
S
O
R
#
1
G
A
S
V
A
L
V
E
G
V
2
I
G
N
I
T
O
R
#
1
Anticipator Setpoint  
Gas Valve  
G
A
S
V
A
L
V
E
1st Stage  
0.30 amp  
2nd Stage  
0.11 amp  
Honeywell VR8440  
White-Rodgers 36C68  
S
E
N
S
O
R
#
2
I
G
N
I
T
O
R
#
2
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.  
B
U
R
N
E
R
C
O
M
P
A
R
T
M
E
N
T
FIG 13-GAS VALVE AND CONTROLS  
START-UP  
6. Auxiliary Limit Switch (AUX) This control is located inside  
the heat exchanger compartment and is set to open at  
190°F. It is a manual reset switch. If AUX limit trips, then the  
primary limit has not functioned correctly., Replace the  
primary limit  
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 5.0" for natural gas  
units. If gas pressure is outside these limits, contact the  
OPERATING INSTRUCTIONS  
CAUTION: This furnace is equipped with an intermittent pilot  
and automatic re-ignition system.DO NOT attempt  
to manually light the pilot.  
ON-OFF CONTROL  
TO LIGHT PILOT AND MAIN BURNERS:  
HIGH FIRE ADJ.  
(UNDER SCREW)  
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.  
PILOT ADJ.  
(UNDER SCREW)  
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).  
FIG. 14 - TYPICAL GAS VALVE  
TO SHUT DOWN:  
local gas utility for corrective action.  
1. Turn “off” electric power to unit.  
MANIFOLD GAS PRESSURE ADJUSTMENT  
Small adjustments to the high-fire gas flow may be made by  
turning the pressure regulator adjusting screw onthe automatic  
gas valve. Refer to figure below.  
2. Depress knob of gas valve while turning to “off” position.  
POST-START CHECK LIST (GAS)  
After the entire control circuit has been energized and the  
heating section is operating, make the following checks:  
Adjust as follows:  
1. Remove the cap on the regulator. It’s located next to the  
1. Check for gas leaks in the unit piping as well as the supply  
piping.  
push-on electrical terminals.  
2. To decrease the gas pressure, turn the adjusting screw  
counterclockwise.  
Unitary Products Group  
17  
530.18-N11Y  
Reverse the above procedure to replace the assemblies.Make  
sure that burners are level and seat at the rear of the heat  
exchanger.  
BURNER ASSEMBLY BRACKET  
FLAME SENSOR BULB  
BURNER AIR SHUTTER ADJUSTMENT  
Adjust burner shutters so no yellow flame is observed in the  
heat exchanger tubes.  
CHECKING SUPPLY AIR CFM  
TheRPMofthesupplyairblowerwilldependontherequiredCFM,  
the unit accessories or options and the static resistances of both  
the supply and the return air duct systems. With this information,  
the RPM for the supply air blower and the motor pulley adjustment  
(turns open) can be determined from the Blower Performance  
Data Table.  
1/8" GAP BETWEEN CARRY-OVER  
TUBE AND FLAME SENSOR BULB  
CARRY-OVER TUBE  
FIG. 15 - PROPER FLAME ADJUSTMENT  
A high speed drive accessory 1LD0435 (containing a smaller  
blower pulley and shorter belts) is available for applications  
requiring the supply air blower to produce higher CFM’s and/or  
higher static pressures. Refer to the Blower Motor and Drive  
Data Table.  
3. To increase the gas pressure, turn the adjusting screw  
clockwise.  
NOTE: The correct manifold pressure for these furnaces is  
3.65 IWG ±0.3.  
PILOT CHECKOUT  
Note the following:  
The pilot flame should envelope the end of the flame sensor.Refer  
to Proper Flame Adjustment figure. To adjust pilot flame, (1)  
remove pilot adjustment cover screw, (2) increase or decrease the  
clearance for air to the desired level, (3) be sure to replace cover  
screw after adjustment to prevent possible gas leakage.  
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 ELECTRIC  
POWER TO THE UNIT.  
1. Remove the 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 closure panel.  
4. Disconnect wiring to the gas valves and spark ignitors.  
Remove the manifold-burner gas valve assembly by lifting  
up and pulling back.  
FIG.17 - BELT ADJUSTMENT  
Burners are now accessible for service.  
1. The supply air CFM must be within the limitations shown in  
Unit Application DataTable.  
2. Pulleys can be adjusted in half turn increments.  
3. The tension on the belts should be adjusted as shown in  
the belt adjustment figure below.  
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:  
1. Remove the two 5/16" dot plugs from the blower motor and  
the filter access panels.  
FIG. 16 - TYPICAL FLAME APPEARANCE  
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530.18-N11Y  
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 indoor coil.  
NOTE:  
DE-ENERGIZE THE COMPRESSORS BEFORE TAKING ANY TEST  
MEASUREMENTS TO ASSURE A DRY INDOOR COIL.  
ADJUSTMENT OF TEMPERATURE RISE  
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.  
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 ETL rating plate.  
After the temperature rise has been determined, the cfm can  
be calculated as follows:  
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  
inaccurate. To assure a dry coil, the compressors should  
be deactivated while the test is being run.  
After about 20 minutes of operation, determine the furnace  
temperature rise. Take readings of both the return air and the  
heated air in the ducts (about six feet from the furnace) where they  
will not be affected by radiant heat. Increase the blower cfm to  
decrease the temperature rise; decrease the blower cfm to  
increase the rise. Refer to the Blower Motor And Drive Data table.  
4K.nowingthepressuredropacrossadrycoil,theactualCFM  
through the unit and clean 2" filters, can be determined from  
the curve in the Pressure Drop Verses Supply Air CFM  
figure.  
BELT DRIVE BLOWER  
WARNING:Failure to properly adjust the total system air quan-  
All units have belt drive single-speed blower motors. The  
variable pitch pulley on the blower motor can be adjusted to  
obtain the desired supply air CFM. Tighten belts enough to  
prevent slipping. but do not over tighten. Belt deflection should  
be between 1/4" and 1/2" per foot.Refer to the table for Blower  
Motor And Drive Data.  
CHECKING GAS INPUT  
NATURAL GAS  
1. Turn off all other gas appliances connected to the gas meter.  
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.  
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 the Gas RateTable.  
TABLE 11 - GAS RATE - CUBIC FEET PER HOUR  
Seconds  
for One  
Rev.  
Size of Test Dial  
1/2 cu. ft.  
1 cu. ft.  
4
6
8
450  
300  
228  
180  
900  
600  
450  
360  
10  
12  
14  
16  
18  
20  
150  
129  
113  
100  
90  
300  
257  
225  
200  
180  
FIG. 18 - PRESSURE DROP ACROSS A DRY INDOOR  
COIL VS SUPPLY AIR CFM  
tity can result in extensive blower damage.  
22  
24  
26  
28  
82  
75  
69  
64  
164  
150  
138  
129  
After readings have been obtained, remove the tubes and  
reinstall the two 5/16" dot plugs that were removed in Step 1.  
Example: By actual measurement, it takes 13 seconds for the hand on the 1-cubic  
foot dial to make a revolution with just a 300,000 Btuh furnace running. Read  
across to the column in the table above, headed “1 Cubic Foot”, where you will see  
that 278 cubic feet of gas per hour are consumed by the furnace at that rate.  
Multiply 278 x 1050 (the Btu rating of the gas obtained from the local gas company).  
The result is 292,425 Btuh, which is close to the 300,000 Btuh rating of the furnace.  
Btuh Input x 0.8  
1.08 x oF Temp. Rise  
CFM =  
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.  
Unitary Products Group  
19  
530.18-N11Y  
MAINTENANCE  
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.  
GAS HEATING UNITS  
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 to give a distinct, sharp blue flame as  
explained under “BURNER AIR SHUTTER ADJUSTMENT”. If  
it is not possible to adjust for the proper flame, the burners may  
need cleaning.  
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.)  
NORMAL MAINTENANCE  
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.  
CAUTION: Prior to any of the following maintenance proce-  
dures, shut off all electric power to the unit to  
prevent personal injury.  
Periodic maintenance normally consists of changing or  
cleaning filters and (under some conditions) cleaning the main  
burners.  
FILTERS - Inspect once a month. Replace disposable or clean  
permanent type as necessary. DO NOT replace permanent  
type with disposable. The dimensional size of the replacement  
filter must be the same as the replaced filter.  
CLEANING FLUE PASSAGES AND HEATING ELEMENTS  
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:  
MOTORS  
1. Remove the burner assembly as outlined in “BURNER  
Outdoor fan motors are permanently lubricated and require no  
maintenance.  
INSTRUCTIONS”.  
2. Remove the roof over the gas heat section.  
3. At the top plate from the top draft blower housing and the  
top draft blower wheel.  
4. 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. Then remove the center  
divider plate separating the upper and lower flue boxes.  
Ventor motor is factory lubricated for an estimated 10 year  
life.  
Indoor Blower Motor and Drive - The indoor blower motor  
features ball bearings that do not require periodic lubrication.  
Periodic lubrication of the motor and bearings can extend the  
life of components but is optional.  
CAUTION: Damage can occur if the bearings are overlubri-  
cated. Use grease sparingly.  
5. On the inside of the flue collector box, remove the flue  
baffles from the tube interiors. Note the last bend of the  
baffle fits tightly against the tube forcing the end of the baffle  
to lock into the tube collar. This collar is formed when the  
tube is expanded into the end sheet. To remove, move the  
end of the baffle toward the center of the tube releasing the  
end of the baffle from the tube collar, then pull straight out  
of the tube.  
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.  
7. Brush out the inside of the flue collector box and the flue  
baffles.  
WARNING:Perform all maintenance operations on the blower  
motor with electric power disconnected from the  
unit. Do not attempt to lubricate bearings with the  
unit in operation.  
On an annual basis, check the motor for accumulations of dust,  
etc. that may block the cooling slots in the motor shell. Check for  
loose, damaged or misaligned drive components. Check that all  
mounting bolts are tight. Replace defective parts as required.  
If desired, every three years remove both pipe plugs at each end  
shell and clean out any hardened grease or foreign matter.  
Replace one plug on each end with a clean grease fitting. Using  
a low pressure grease gun, pump grease (Chevron SRI-2 or  
equivalent) into the bearing cavity until new grease shows at the  
open port. Do not over lubricate. Run the motor for ten minutes  
until excess grease is purged from the cavity. Replace the plugs.  
8. Run the wire brush down the vent hoods from the flue  
collector end.  
9. If soot build-up is particularly bad, remove the vent motor  
and cleanthewheelandhousings.Runthewirebrushdown  
the flue extentions at the outlet of the vent housings.  
Units are supplied withblower shaft bearingsthatdonot require  
maintenance but may be relubricated if desired. Every three  
years, using a low pressure grease gun, pump grease into the  
bearing grease fitting until grease just begins to show at the  
seals. Do not over lubricate. Use any lithium base grease  
recommended for ball bearing service.  
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 electric power to  
the unit is shut off prior to cleaning.  
NOTE: Exercise care when cleaning the coil so that the coil  
fins are not damaged.  
Do not permit the hot condenser air discharge to be  
obstructed by overhanging structures of shrubs.  
FIG. 19 - TYPICAL FLUE BAFFLE INSTALLATION  
20  
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530.18-N11Y  
TROUBLESHOOTING  
10. After brushing is complete, blow all brushed areas with air  
or nitrogen. Vacuum as needed.  
11. Replace parts in the order they were removed in Steps  
1 thru 4.  
12. When replacing the center and top of the flue collector box,  
be careful not to tear the adjoining insulation.  
13. Ensure that all seams on the vent side of the combustion  
system are air tight. Apply a high temperature (+500°F)  
sealing compound where needed.  
2. 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”.  
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 contactor (M3), and if the  
contactor is pulled in. Check for loose wiring.  
b. If contactor (M3) is pulled in, proceed with the trou-  
bleshooting steps indicated in Step 1 above.  
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 (M3) is pulled in and the blower motor still does not  
run, replace the blower motor.  
d. If (M3) is not pulled in, check for 24 volts at the (M3) coil.  
If 24 volts is present, replace the (M3) contactor.  
WARNING: Prior to any of the following maintenance proce-  
dures, shut off all electric power to the unit to  
prevent personal injury.  
e. If 24 volts is not present at the (M3) 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.  
CAUTION: Label all wires prior to disconnection when servic-  
ing controls. Wiring errors can cause improper and  
dangerous operation. Verify proper operation after  
servicing.  
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, the Mate-N-Lok connector in the  
partition between the evaporator and gas heat sections  
and the time delay relay (ETD).  
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.)  
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 (ETD) relay.  
1. The indoor blower motor is a non-inherently protected  
three-phase motor. Protection is provided by an overload  
relay for overcurrent and fuses for short circuit. If the motor  
fails to run, check the line voltage circuit and control voltage  
circuit per the following procedure:  
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.  
a. If the Indoor Blower Motor does not operate, check  
visually that contactor M3 is pulled in. If so, check for  
line voltage between all three phases at the line termi-  
nals of the Blower Overload Relay (BOR). If line voltage  
is found, check the leads to the blower motor for open  
circuit. If line voltage is found at the motor leads (inside  
the conduit box on the motor shell), disconnect the  
motor and check for open windings per the motor wiring  
diagram. If open windings are found, replace the motor.  
If line voltage is not found at the BOR, trace the leads  
back to the field supply terminal block, checking for an  
open circuit or blown fuses.  
3. 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  
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.  
b. If the contactor M3 is not pulled in, check for control  
voltage (24V) at the M3 coil. If voltage is found, replace  
the contactor.If control voltage is not found at M3, check  
for voltage across terminals 95 & 96 of the BOR. If  
voltage exists, the BOR is open on overload. The BOR  
should be set to the auto reset position. The BOR must  
cool down in order to reset. If the BOR will not reset,  
replace the BOR. If the BOR resets and M3 pulls in, but  
the indoor blower motor will still not run, refer to para.  
(a) for troubleshooting the line voltage supply circuit. If  
control voltage is not found at the BOR, trace the circuit  
back to the relay board and thermostat per the unit  
wiring diagram. Replace any defective components.  
c. If line voltage is not present, check for line voltage at the  
heat relay (RW1) contacts in the main control box and  
check to see if the (RW1) is pulled in.  
d. If the (RW1) relay is pulled in, check for a loose line  
voltage connection.  
e. If the (RW1) relay is not pulled in, check for 24 volts at  
the (RW1) coil. If 24 volts is present, replace the (RW1)  
relay. If 24 volts is not present, check for a loose 24 volt  
connection back to the relay board and check the con-  
nections from the room thermostat to the relay board. If  
all connections are correct, replace the relay board.  
Cont’d.  
Unitary Products Group  
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530.18-N11Y  
TROUBLESHOOTING - Cont’d.  
4. The draft motor runs but the furnace does not light and the  
sparker does not spark.  
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.  
a. The ignition control (IC1, IC2) may be locked out due to  
either a flame roll out or 100% shut off. These safety  
features are described above. If lock-out has occurred,  
24V must be removed from the ignition controls. This is  
done at the unit or by resetting the room thermostat.  
After resetting 24V, check for proper furnace operation.  
If lock-out continues to occur, locate the source of the  
problem and correct.  
6. The sparker sparks at the pilot burner but the pilot does not  
ignite and a gas odor is detected at the draft motor outlet.  
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  
b. Check all 24 volt connections from the relay board to  
and in the gas heat section. Check low voltage connec-  
tions to the (ETD) located in the control box.  
START CHECK LIST”.Makeadjustmentsasnecessary.  
c. Check the pilot orifice for obstruction as described in  
para. 5d. Clean as needed but the problem should not  
be the gas valve.  
c. If the furnace is hot, it may be out on an over-tempera-  
ture condition, wait for limit reset.  
7. The pilot burner ignites but the sparker continues to spark  
and the main burners do not ignite.  
d. If the furnace is cold, check for 24 volts at wire 241  
attached to the electronic time delay (ETD) located in  
the main control box. If 24 volts is not found, replace the  
ETD.  
a. Make the same checks and adjustment as described in  
para. 6.  
e. With the draft motor running, check for 24 volts at  
terminal 4 of (RW1-2) and (RW2-1). 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.  
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.  
8. The pilot burner lights and the spark stops but the main  
burners do not light.  
f. Check for 24V at terminal 2 of (RW1-2 and RW2-1). If  
24V is not present, check for 24V at (RW1 and RW2)  
relay coils. If these relays are pulled in, then check for  
a loose connection at terminal 2 and terminal 4 of each  
relay. If no problem is found, then replace (RW1 and/or  
RW2) as required.  
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.  
g. If 24 volts is present at the ignitor controls, check all  
control wiring at the ignitor controls and the high tension  
wire to the ignitors. Check that the ground wires from  
the ignitor controls, the gas valves and pilot burners are  
all intact and making good electrical connection.Check  
to make sure that the ceramic insulator on the pilot  
ignitors or sensors is not broken or cracked, if all are  
intact, replace the ignition control IC1 or IC2.  
9. 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.  
5. 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.  
10. Main burners light but exhibit erratic flame characteristics.  
a. Adjust air shutters as described in “BURNER AIR  
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 some  
flow of gas as described in “PILOT CHECKOUT”.  
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.  
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.  
22  
Unitary Products Group  
530.18-N11Y  
REPLACEMENT PARTS  
GAS HEAT SECTION  
COMPRESSOR SECTION  
FABRICATED PARTS SECTION  
• Hermetic compressor  
• Compressor mounting  
MOTOR SECTION  
• Heat exchanger  
• Panels  
• Gas valve  
• Posts  
• Pilot  
• Covers Drain pans  
• Base rails  
• Air hoods  
• Flame sensor  
• Spark ignitor  
• Gas manifold  
• Gas burner  
• Blower motor  
• Fan motor  
MISCELLANEOUS SECTION  
• Ventor motor  
AIR MOVING SECTION  
• Air inlet hood screen  
ELECTRICAL SECTION  
• Fan guard  
• Blower wheel  
• Air filters  
• Ignition control  
• Relay board  
• Contactor  
• Blower wheel housing  
REFRIGERANT SECTION  
• Circuit breaker  
• Temperature controls  
• Capacitors  
• Evaporator coil  
• Evaporator coil header  
• Expansion valve assembly  
• Condenser coil  
• Relays  
• Transformers  
• Connectors  
• Condenser coil header  
TO OBTAIN PARTS INFORMATION: Replacement parts and information from OUR current parts list for this unit are available to  
your servicing contractor through our local distributor. The name and address of our nearest distributor may be obtained by  
consulting the Yellow Pages of a local telephone directory.  
IMPORTANT: In order to supply the correct part or information from the parts list, our distributor will need to be provided with the  
complete model number listed on the rating plate located on your unit. See page 2 for Product Nomenclature.  
WARNING:IMPROPER INSTALLATION,ADJUSTMENT,SERVICE OR MAINTENANCE CAN CAUSE INJURY OR PROPERTY  
DAMAGE. CONSULT A QUALIFIED INSTALLER, SERVICE AGENCY OR YOUR LOCAL GAS SUPPLIER FOR INFORMATION  
OR ASSISTANCE.  
Unitary Products Group  
23  
Unitary Products Group  
5005 York Drive, Norman, Oklahoma 73069  
Subject to change without notice. Printed in U.S.A.  
Copyright by York International Corporation 1999. All Rights Reserved.  
530.18-N11Y  
Code: SBY  

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