York Sunline 2000 D7cg 036 User Manual

®  
SUNLINE 2000  
GAS / ELECTRIC  
SINGLE PACKAGE AIR CONDITIONERS  
Supersedes: 530.18-N8Y (295)  
530.18-N8Y (1096)  
INSTALLATION INSTRUCTION  
035-14838  
MODELS D7CG 036, 048 & 060 (10 SEER)  
MODEL D2CG 072 (9 EER)  
(STYLE A & Belt Drive Option)  
CAUTION  
FOR YOUR SAFETY  
SCROLL COMPRESSORS  
OPERATE IN ONLY ONE  
DIRECTION.  
Do not store or use gasoline or  
other flammable vapors or liquids  
in the vicinity of this or any other  
appliance.  
If you smell gas:  
1. Open windows  
If the compressor is  
experiencing:  
- low amperage draw  
- similar discharge and  
suction pressure  
2. Don’t touch electrical switches.  
3. Extinguish any open flame.  
4. Immediately call your gas supplier.  
- increased noise level  
It is operating in reverse.  
Switch two line voltage  
connections to correct.  
GENERAL  
530.18-N1.12V -Motorized Outdoor Air Damper Accy.  
YORK Model DCG units are single package air conditioners  
with gas heat designed for outdoor installation on a roof top or  
a slab.  
530.18-N1.8V -Coil Guard  
530.18-N2.11V -Low NOx Accessory  
The units are completely assembled on rigid, permanently  
attached base rails. All piping, refrigerant charge, and electrical  
wiringis factory-installedand tested. The unitsrequire onlyelectric  
power, gas piping and duct connections at the point of installation.  
530.18-N8.2V -High Altitude Accy. (Natural Gas)  
530.18-N8.3V -High Altitude Accy. (Propane)  
530.18-N8.4V -Gas Piping Accessory  
530.18-N8.12V -Propane Conversion Accessor  
The gas-fired heaters have aluminized steel tubular heat  
exchangers and spark ignition with intermittent pilot.  
690.15-N25V  
-Low Ambient Accessory  
This appliance is not to be used for temporary heating of  
buildings or structures under construction.  
Renewal Parts:  
Refer to Parts Manual for complete listing of replacement  
INSPECTION  
parts on this equipment.  
As soon as a unit is received, it should be inspected for possible  
damage during transit. If damage is evident, the extent of the  
damage should be noted on the carrier’s freight bill. Aseparate  
request for inspection by the carrier’s agent should be made in  
writing. Refer to Form 50.15-NM for additional information.  
All forms referenced in this instruction may be ordered from:  
Publications Distribution Center  
Unitary Products Group  
P.O. Box 1592, York, PA 17405  
REFERENCE  
APPROVALS  
Additional information on the design, installation, operation and  
service ofthisequipmentisavailable in thefollowingreference forms:  
Design certified by CGA and UL listed as follows:  
1. For use as a forced air furnace with cooling unit.  
2. For outdoor installation only.  
3. For installation directly on combustible flooring or, in the U.S.A.,  
on wood flooring or Class A, B, or C roof covering material.  
4. For use with natural gas and/or propane (LP) gas.  
55.70-N1  
-General Installation  
-Pre-start & Post-start Check List  
55.70-N2  
530.18-N1.2V -Economizer Accessory  
530.18-N1.13V -Man. Outdoor Air Damper Accy 0-35%  
530.18-N1.14V -Man. Outdoor Air Damper Accy 0-100%  
Not suitable for use with conventional venting systems.  
Installer should pay particular attention to the words: NOTE, CAUTION and WARNING. Notes are intended to clarify or make  
the installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal injury  
and/or equipment damage may result if installation procedure is not handled properly.  
CAUTION  
THIS PRODUCT MUST BE INSTALLED IN STRICT COMPLIANCE WITH THE ENCLOSED INSTALLATION INSTRUCTIONS  
AND ANY APPLICABLE LOCAL, STATE, AND NATIONAL CODES INCLUDING, BUT NOT LIMITED TO, BUILDING, ELECTRI-  
CAL, AND MECHANICAL CODES  
WARNING  
INCORRECT INSTALLATION MAY CREATE A CONDITION WHERE THE OPERATION OF THE PRODUCT COULD CAUSE  
PERSONAL INJURY, PROPERTY DAMAGE AND/OR DEATH.  
WARNING  
DE-ENERGIZE THE ELECTRICAL POWER AND TURN OFF THE GAS SUPPLY TO THE UNIT BEFORE ATTEMPTING TO  
INSPECT, REPAIR OR PERFORM MAINTENANCE TO THE UNIT.  
530.18-N8Y  
INSTALLATION  
LIMITATIONS  
4. Roof structures must be able to support the weight of the unit  
and its options and / or accessories. Unit must be installed on  
a solid level roof curb or appropriate angle iron frame.  
These units must be installed in accordance with the current  
editions of the following national and local safety codes:  
In the U.S.A.:  
CAUTION: If a unit is to be installed on a roof curb or special  
frame other than a YORK roof curb, gasketing must  
be applied to all surfaces that come in contact with  
the unit underside.  
1. National Electrical Code ANSI/NFPA No. 70.  
2. National Fuel Gas Code Z223.1.  
3. Gas-Fired Central Furnace Standard ANSI Z21.47-1993.  
4. Local gas utility requirements.  
5. Maintain level tolerance to 1/2" maximum across the entire  
length or width of the unit.  
In Canada:  
6. Elevate the unit sufficiently to prevent any blockage of the  
air entrances by snow in areas where there will be snow  
accumulation. Check the local weather bureau for the  
expected snow accumulation in your area.  
1. Canadian Electrical Code CSA C22.1  
2. Current Gas Installation Codes CAN/CGA-2.3-M93.  
3. Local plumbing and waste water codes.  
4. Other applicable local codes.  
RIGGING AND HANDLING  
Exercise care when moving the unit. Do not remove any  
packaging until the unit is near the place of installation. Rig the  
unit by attaching chain or cable slings to the lifting holes  
provided in the base rails. Spreaders, whose length exceeds  
the largest dimension across the unit, MUST be used across  
the top of the unit.  
Refer to Table 1 for Unit Application Data and to Table 2 for Gas  
Heat Application Data.  
If components are to be added to a unit to meet local codes, they  
are to be installed at the dealer’s and / or the customer’s expense.  
Size of unit for proposed installation should be based on heat  
loss / heat gain calculation made according to the methods of  
Air Conditioning Contractors of America (ACCA).  
BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT  
IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT  
WILL LIFT EVENLY.  
TABLE 1 - UNIT APPLICATION DATA  
Units may also be moved or lifted with a forklift. Slotted  
openings in the base rails are provided for this purpose.  
UNIT SIZE  
036  
048  
060  
072  
208/230V  
460V  
575V  
187 / 253  
414 / 504  
518/630  
Voltage Variation  
Min. / Max.1  
LENGTH OF FORKS MUST BE A MINIMUM OF 42".  
Remove the nesting brackets from the four corners on top of  
the unit. All screws that are removed when taking these  
brackets off must be replaced on the unit.  
Supply Air CFM, Nom.  
1200  
1600  
2000  
2400  
Wet Bulb Temperature (°F) of  
Air on Evaporator Coil,  
Min. / Max.  
Dry Bulb Temperature (°F) of  
Air on Condenser Coil,  
Min.2 / Max.  
57 / 72 57 / 72 57 / 72 57 / 72  
45 / 120 45 / 120 45 / 120 45 / 120  
CAUTION: An adhesive backed label is provided over the  
outside of the combustion air inlet opening to pre-  
vent moisture from entering the unit which could  
cause damage to electrical components. Allow this  
closure label to remain in place until the combus-  
tion air hood is to be installed (refer to Figure 5).  
1
2
Utilization range “A” in accordance with ARI Standard 110.  
A low ambient accessory is available for operation down to 0°F.  
Refer to Table 5 for unit weights and to Figure 8 for approximate  
center of gravity.  
LOCATION  
Use the following guidelines to select a suitable location for  
these units.  
CLEARANCES  
All units require certain clearances for proper operation and  
service. Installer must make provisions for adequate combustion  
and ventilation air in accordance with Section 5.3, Air for  
Combustion and Ventilation of the National Fuel Gas Code, ANSI  
Z223.1 (in U.S.A.) or Sections 7.2, 7.3 or 7.4 of Gas Installation  
Codes CAN/CGA-B149.1 and .2 (in Canada) and/or applicable  
provisions of the local building codes. Refer to Figure 9 for the  
clearances required for combustible construction, servicing,  
and proper unit operation.  
1. Unit is designed for outdoor installation only.  
2. Condenser coils must have an unlimited supply of air.  
Where a choice of location is possible, position the unit on  
either north or east side of building.  
WARNING:Excessive exposure of this furnace to contami-  
nated combustion air may result equipment dam-  
age or personal injury. Typical contaminates  
include: permanent wave solutions, chlorinated  
waxes and cleaners, chlorine based swimming  
pool chemicals, water softening chemicals, carbon  
tetrachloride, Halogen type refrigerants, cleaning  
solvents (e.g. perchloroethylene), printing inks,  
paint removers, varnishes, hydrochloric acid, ce-  
ments and glues, antistatic fabric softeners for  
clothes dryers, masonry acid washing materials.  
WARNING: Do not permit overhanging structures or shrubs to  
obstruct condenser air discharge outlet, combustion  
air inlet or vent outlet.  
DUCTWORK  
Ductwork should be designed and sized according to the methods  
inManualQoftheAirConditioningContractorsofAmerica(ACCA).  
Aclosed return duct system shall be used. This shall not preclude  
use of economizers or outdoor fresh air intake. The supply and  
return air duct connections at the unit should be made with flexible  
joints to minimize the transmission of noise.  
3. For ground level installation, a level pad or slab should be  
used. The thickness and size of the pad or slab used should  
meet local codes and unit weight. Do not tie the slab to the  
building foundation.  
Unitary Products Group  
3
530.18-N8Y  
The supply and return air duct systems should be designed for the  
CFMandstaticrequirementsofthejob.TheyshouldNOTbesized  
to match the dimensions of the duct connections on the unit.  
POWER AND CONTROL WIRING  
Field wiring to the unit must conform to provisions of the National  
Electrical Code (NEC), ANSI / NFPA 70-1987 (in U.S.A.) current  
Canadian Electric Code (CEC) C22.1 (in Canada), and / or local  
ordinances. The unit must be electrically grounded in accordance  
with the N.E.C. ANSI / NFPA 70 or local codes.  
CAUTION: When fastening ductwork to the side duct flanges on  
the unit, insert the screws through the duct flanges  
only. DO NOT insert the screws through the casing.  
Voltage tolerances which must be maintained at the  
compressor terminals during start-up and running conditions  
are indicated on the unit Rating Plate and Table 1.  
Outdoor ductwork must be insulated and waterproofed.  
Refer to Figure 9 for information concerning side and bottom  
supply and return air duct openings.  
The internal wiring harness furnished with this unit is an integral  
part of a UL and CGA design certified unit. Field alteration to  
comply with electrical codes should not be required.  
FILTERS  
A disconnect switch should be field provided for the unit. The  
switch must be separate from all other circuits. Refer to Figure  
9 for installation location. If any of the wire supplied with the  
unit must be replaced, replacement wire must be of the type  
shown on the wiring diagram.  
1" filters are supplied with each unit. 2" replacement filters may  
be used with no modification to the filter racks. Filters must  
always be installed ahead of the evaporator coil and must be  
kept clean or replaced with same size and type. Dirty filters will  
reduce the capacity of the unit and will result in frosted coils or  
safety shutdown. Minimum filter area and required sizes are  
shown in Table 5.  
Electricallinesmustbesizedproperlytocarrytheload.USECOPPER  
CONDUCTORS ONLY. Each unit must be wired with a separate  
branch circuit fed directly from the meter panel and properly protected.  
CONDENSATE DRAIN  
CAUTION: When connecting electrical power and control wir-  
ing to the unit, waterproof type connectors MUST  
BE USED so that water or moisture cannot be  
drawn into the unit during normal operation. The  
above waterproofing conditions will also apply  
when installing a field-supplied disconnect switch.  
Plumbing must conform to local codes. Use a sealing compound  
on male pipe threads. Install a condensate drain line from the 3/4"  
PVC female connection on the unit to spill into an open drain.  
NOTE: The condensate drain line MUST be trapped to provide  
proper drainage. See Figure 1.  
Refer to Figure 2 for typical field wiring and to the appropriate unit  
wiring diagram for control circuit and power wiring information.  
BLOWER SPEED SELECTION  
Three blower motor speeds are available on the direct-drive  
units. The speed selection for the direct-drive units is  
determined by the CFM and ESP requirements of the  
applications. All units with belt-drive option have an adjustable  
motor pulley to achieve the above conditions.  
All direct-drive units with 208/230 voltage are shipped with the  
wire labeled #116 connected to the "HIGH" speed tap on the  
blower motor. If a lower blower motor speed is desired, this wire  
should be moved to the "MED" or "LOW" speed tap on the  
motor for the speed desired.  
FIG. 1 - RECOMMENDED DRAIN PIPING  
SERVICE ACCESS  
All direct-drive units with 460 and 575 voltage are shipped with  
the wire labeled #116 connected to the "HIGH" speed tap on  
the blower motor. If the medium speed is required, connect wire  
#116 to the "MED" speed tap and the blue motor lead to the  
"HIGH" speed tap. If the low speed is required, connect wire  
#116 to the "LOW" speed tap, the blue motor lead to the "HIGH"  
speed tap and the orange motor lead to the "MED" speed tap.  
Access to all serviceable components is provided by the  
following removable panels:  
Scroll compressor compartment  
Burner compartment  
Blower compartment  
Main control box  
SCROLL COMPRESSOR  
These units are shipped with the scroll compressor mountings  
factory-adjusted and ready for operation.  
Filter compartment  
Motor access (on units with belt-drive option)  
Refer to Figure 9 for location of these access panels.  
CAUTION: Do Not loosen the scroll compressor mounting bolts.  
CAUTION: Make sure that all screws are replaced on the unit  
to maintain an air-tight seal.  
COMBUSTION DISCHARGE  
The products of combustion are discharged horizontally  
through a screened opening on the gas heat access panel.  
THERMOSTAT  
The room thermostat should be located on an inside wall  
approximately 56" above the floor where it will not be subject  
to drafts, sun exposure, or heat from electrical fixtures or  
appliances. Follow manufacturer’s instructions enclosed with  
thermostat for general installation procedure. Color coded  
insulated wires (#18 AWG) should be used to connect  
thermostat to unit. See Figure 2 for wiring details.  
TABLE 2 - GAS HEAT APPLICATION DATA  
Temp. Rise °F  
Input  
Output  
Available  
on  
Models  
Gas Rate1  
At Full Input 2  
Capacity, Capacity,  
(Mbh)  
50  
(Ft.3/Hr.)  
(Mbh)  
40  
Min.  
15  
Max.  
45  
55  
3 Ton  
4 Ton  
47  
70  
75  
60  
25  
100  
125  
79  
99  
3/5/6 Ton  
4/5/6 Ton  
93  
116  
40/25/25 70/55/55  
45/35/35 75/65/65  
NOTE: If the unit has an economizer, remove jumper J1 from  
terminals 8 and 10 on the relay board to prevent simulta-  
neous operation of the scroll compressor and the econo-  
mizer. If you want to energize the scroll compressor for  
supplemental cooling during the economizer operation,  
use a thermostat with two stages of cooling.  
NOTE: Gas Heaters are shipped available for natural gas, but can be converted to L.P. with Kit Model  
No. 1NP0434. All furnaces meet the latest California seasonal efficiency requirements.  
1
3
Based on 1075 Btu/Ft .  
2
The air flow must be adjusted to obtain a temperature rise within the range shown.  
4
Unitary Products Group  
530.18-N8Y  
TYPICAL CONTROL WIRING  
COOLING / HEATING (24 VOLT THERMOSTAT)  
THERMOSTAT1  
TERMINALS  
COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)  
THERMOSTAT1  
TERMINALS  
UNIT TERMINAL  
UNIT TERMINAL  
STRIP TB1  
STRIP TB1  
24 VOLT  
TRANSFORMER  
ADD  
JUMPER  
ADD  
JUMPER  
2
3
24 VOLT  
TRANSFORMER  
4
NOT  
USED  
ADD  
JUMPER  
4
TO REMOTE SENSOR  
2TH04702224 IF USED  
1 24 VOLT THERMOSTAT 2TH07701024. IF THE UNIT HAS AN ECONOMIZER,  
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD  
TO PREVENT SIMULTANEOUS OPERATION OF THE SCROLL COMPRESSOR  
AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A  
SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY  
WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024.  
1 ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE)  
TO CONTROL ECONOMIZER ON SECOND STAGE OF COOLING, REMOVE JUMPER  
J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.  
2 SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.  
3 SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE  
ELECTRIC HEATER.  
COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)  
THERMOSTAT1  
4 REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR  
P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 AND A2 PROVIDE A RELAY  
OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE  
THERMOSTAT SWITCHES TO THE SET-BACK POSITION.  
TERMINALS  
UNIT TERMINAL  
STRIP TB1  
1 ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).  
IF THIS UNIT HAS AN ECONOMIZER, REMOVE JUMPER J1 FROM TERMINALS 8 AND  
10 ON THE RELAY BOARD TO PREVENT SIMULTANEOUS OPERATION OF THE  
SCROLL COMPRESSOR AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE  
ECONOMIZER ON A SECOND STAGE OF COOLING, USE THERMOSTAT 2ET04700224.  
ADD  
JUMPER  
24 VOLT  
TRANSFORMER  
CAUTION: Label all wires prior to disconnection when servic-  
ing controls. Wiring errors can cause improper and  
dangerous operation. Verify proper operation after  
servicing.  
TYPICAL POWER WIRING  
REFER TO ELECTRICAL DATA  
TABLES TO SIZE THE DISCONNECT  
SWITCH, WIRING & OVERCURRENT  
PROTECTION.  
REFER TO ELECTRICAL DATA  
TABLES TO SIZE THE DISCONNECT  
SWITCH, WIRING & OVERCURRENT  
PROTECTION.  
FIG. 2 - TYPICAL FIELD WIRING  
the current Gas Installation Codes CAN/CGA-B149.1 and .2 (in  
Canada) should be followed in all cases unless superseded by  
local codes or gas company requirements. Refer to Table 3.  
DISCONNECT SWITCH BRACKET FOR UNITS  
WITH OPTIONAL BELT-DRIVE BLOWER  
A special bracket for mounting a field-supplied disconnect  
switch is provided in each unit ordered with an optional  
belt-drive supply air blower. The bracket is shipped inside the  
blower compartment taped to the top of the blower housing.  
Install the bracket on the left hand side of the unit as shown in  
Figure 9. Several existing screws at the top of the unit and one  
screw approximately midway down from the top will be used  
for mounting the bracket. Screws should be loosened only -  
NOT REMOVED. Matching holes in the bracket have  
elongated keyways allowing easy installation. Re-tighten  
screws after bracket is in place to ensure panels will remain  
leak tight.  
TABLE 3 - PIPE SIZING  
Nominal Iron Pipe Size  
Length in Feet  
1/2 in.  
3/4 in.  
1 in.  
1-1/4 in.  
10  
20  
30  
40  
50  
60  
70  
80  
90  
100  
132  
92  
73  
63  
56  
50  
46  
43  
40  
38  
278  
190  
152  
130  
115  
105  
96  
90  
84  
79  
520  
350  
285  
245  
215  
195  
180  
170  
160  
150  
1,050  
730  
590  
500  
440  
400  
370  
350  
320  
305  
GAS PIPING  
Proper sizing of gas piping depends on the cubic feet per hour  
of gas flow required, specific gravity of the gas and the length  
of run. “National Fuel Gas Code” Z223-1992 (in the U.S.A.), or  
Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3  
inch water column and 0.6 specific gravity gas).  
Unitary Products Group  
5
530.18-N8Y  
FIG. 4 - BOTTOM SUPPLY CONNECTION  
FIG. 3 - EXTERNAL SUPPLY CONNECTION  
EXTERNAL SHUT-OFF  
EXTERNAL SHUT-OFF  
The heating value of the gas may differ with locality. The value  
should be checked with the local gas utility.  
6. The furnace and its individual manual shut-off valve must  
be disconnected from the gas supply piping system during  
any pressure testing of that system at test pressures in  
excess of 1/2 psig (3.48kPa).  
NOTE: There may be a local gas utility requirement specifying  
a minimum diameter for gas piping. All units require a  
1/2 inch pipe connection at the entrance fitting.  
The furnace must be isolated from the gas supply piping  
system by closing its individual manual shut-off valve during  
any pressure testing of the gas supply piping system at test  
pressures equal to or less than 1/2 psig (3.48kPa).  
GAS CONNECTION  
The gas supply line can be routed through the knockouts  
located on the front of the unit or through the opening provided  
in the unit’s base. Refer to Figure 9 to locate these access  
openings. Typical supply piping arrangements are shown in  
Figures 3 and 4. All shaded items are field-supplied.  
7. A 1/8 inch NPT plugged tapping, accessible for test gage  
connection, must be installed immediately upstream of the  
gas supply connection to the furnace.  
Two grommets are shipped in the blower compartment (in parts  
bag taped to the blower housing) of every unit with gas heat  
and should be used in the knockouts when the gas piping  
penetrates the front of the unit.  
L.P./PROPANE UNITS, TANKS AND PIPING  
All gas heat units are shipped fromthe factoryequipped fornatural  
gas use only. The unit may be converted in the field for use with  
L.P./propane gas with accessory kit model number 1NP0440.  
After the gas supply piping has been installed, the bottom  
opening should be sealed to prevent water from leaking into  
the building.  
All L.P./propane gas equipment must conform to the safety  
standards of the National Fire Protection Association.  
Gas piping recommendations:  
For satisfactory operation, L.P./propane gas pressure must be  
10.5 inch W.C at the unit under full load. Maintaining proper gas  
pressure depends on three main factors:  
1. A drip leg and a ground joint union must be installed in the  
gas piping.  
1. The vaporization rate which depends on (a) the  
temperature of the liquid and (b) the “wetted surface” area  
of the container or containers.  
2. When required by local codes, a manual shut-off valve may  
have to be installed outside of the unit.  
2. The proper pressure regulation. (Two-stage regulation is  
recommended from the standpoint of both cost and  
efficiency.)  
3. Use wrought iron or steel pipe for all gas lines. Pipe  
compound should be applied sparingly to male threads  
only.  
3. The pressure drop in the lines between regulators and  
between the second stage regulator and the appliance.  
Pipe size required will depend on the length of the pipe run  
and the total load of all appliances.  
WARNING:Natural gas may contain some propane. Propane,  
being an excellent solvent, will quickly dissolve  
white lead or most standard commercial com-  
pounds. Therefore, a special pipe compound must  
be applied when wrought iron or steel pipe is used.  
Shellac base compounds such as Gaskolac or  
Stalastic, and compounds such as Rectorseal #5,  
Cyde’s or John Crane may be used.  
Complete information regarding tank sizing for vaporization,  
recommended regulator settings, and pipe sizing is available from  
most regulator manufacturers and L.P./propane gas suppliers.  
L.P./propane gas is an excellent solvent and special pipe  
compound must be used when assembling piping for this gas  
as it will quickly dissolve white lead or most standard  
commercial compounds. Shellac base compounds such as  
Rectorseal #5 are satisfactory for this type of gas.  
4. All piping should be cleaned of dirt and scale by hammering  
on the outside of the pipe and blowing out the loose dirt and  
scale. Before initial start-up, be sure that all of the gas lines  
external to the unit have been purged of air.  
Check all connections for leaks when piping is completed,  
using a soap solution. NEVER USE A FLAME.  
5. The gas supply should be a separate line and installed in  
accordance with all safety codes as prescribed under  
“Limitations”. After the gas connections have been  
completed, open the main shut-off valve admitting normal  
gas pressure to the mains. Check all joints for leaks with  
soap solution or other material suitable for the purpose.  
NEVER USE A FLAME.  
LOW NOx APPLICATION  
For natural gas heat installations in locations which require low  
Nitros Oxide emissions, accessory model 1LN0404 must be  
installed.  
6
Unitary Products Group  
530.18-N8Y  
1. With filter section access panel removed, take out hood  
components, filters and sensor described above. Remove  
and discard outdoor air opening cover on back unit (Upper  
right hand corner).  
VENT AND COMBUSTION AIR HOODS  
The vent and combustion air hoods are shipped attached to the  
blower housing in the blower compartment. These hoods must  
be installed on the outside of the gas heat access panel to  
ensure proper unit function. The necessary mounting screws  
are provided in a bag also attached to the blower housing.  
2. Remove the 1/2" knockout (A) in the units rear panel  
(located to the right side of the outdoor air opening). Insert  
the two loose wires from inside the unit, into the 1/2"  
bushing provided. Insert wires and bushing into knockout.  
Snap bushing into place.  
The screen for the combustion air intake hood is secured to the  
inside of the access panel opening with three fasteners and the  
screws used for mounting the hood to the panel. The top flange  
of this hood slips in under the top of the access panel opening  
when installing. Refer to Figure 5. Remove the protective label  
covering the opening just prior to installing this hood.  
3. Mount the outdoor air sensor to the rear panel, just below  
the knockout described in Step 2. Secure with two  
self-drilling screws at dimples (B) provided in the panel.  
The vent hood (including its screen) is installed by inserting the  
top flange of the hood into the slotted opening in the access  
panel. The top screw secures the hood to the access panel.  
The remaining two side screws must be installed after the  
access panel is installed on the unit. These screws engage the  
bottom flue box flange.  
NOTE: Sensor must be positioned so that the sensing ports  
are at the top (louvers pointing downward) and terminal  
connections to the right.  
4. Connect the two wires, indicated in Step 2, to the sensor  
as follows:  
CAUTION: All three screws in the vent hood must be properly  
installed before furnaceoperation toinsureallcom-  
bustion products are exhausted from the unit.  
Wire #73 to terminal (+)  
Wire #74 to terminal (S)  
5. Assemble the LH and RH side plates to the top cover (2  
screws each side) to form the hood. Apply gasketing to the  
flange surface on each side plate. Extend gasketing 1/4"  
beyond top and bottom of each flange to insure adequate  
corner sealing. Secure this assembly to the unit back panel  
(upper right hand corner). First, remove screw (C) on unit  
top cover. Then slip flange of hood cover in under flange of  
unit top cover, replace screw (C), engaging hole (E) in hood  
flange and tighten. Attach the two side plates to the unit  
panel by using two self-drilling screws for each side plate  
at dimples (D) provided in the panel.  
FIG. 5 - VENT AND COMBUSTION AIR HOODS  
6. Position fillpiece at bottom of hood, between the two side  
plates but do not secure at this time. (Slotted openings MUST  
be downward for drainage). After fillpiece is properly posi-  
tioned, note where contact is made with the unit panel. Re-  
move fillpiece and apply gasket material to this area to provide  
a seal. Reposition fillpiece and secure with 2 screws.  
OPTIONAL ECONOMIZER RAIN HOOD  
The following procedure should be used when assembling an  
economizer rain hood onto a unit. Refer to Figure 6. The  
outdoor and return air dampers, damper actuator, the linkage  
and all the controls are factory mounted as part of the  
economizer option.  
7. Install the two filters into the hood assembly, sliding down  
along retainers on side plates, into fillpiece at bottom of  
hood.  
All of the hood components, including the filters, the gasketing  
and thehardware forassemblingarelocatedabovethetopfilter  
racks within the filter section. The outdoor air sensor is in the  
bag of parts located at the bottom of the return air section.  
OUTDOOR AIR  
C
OPENING COVER  
HOOD  
COVER  
FILTER  
COVER  
D
D
OUTDOOR AIR  
SENSOR  
E
D
D
A
GASKETED  
FLANGE  
GASKET  
B
L. H. SIDE  
PLATE  
FILTER SECTION  
ACCESS PANEL  
GASKETED  
FLANGE  
SIDE DUCT  
APPLICATION SHOWN  
R. H.  
SIDE  
PLATE  
FILTERS  
FILLPIECE  
FIG. 6 - ECONOMIZER RAIN HOOD ASSEMBLY (OPTION)  
Unitary Products Group  
7
530.18-N8Y  
NOTE: Install filters so that “Air Flow” arrows point toward the  
unit.  
adjusting screw to the “A”, “B”, “C” or “D” setting corre-  
sponding to the lettered curve. For a dual enthalpy econo-  
mizer, carefully turn the set point adjusting screw fully  
clockwise past the “D” setting.  
8. Install filter cover over the end of the hood with one screw  
(center of hood), securing filters into position.  
10. To check that the damper blades move smoothly without  
binding, carefully turn the minimum position adjusting  
screw fully clockwise and then energize and de-energize  
terminals “R” to “G”. With terminals “R” to “G” energized,  
turn the minimum position screw counterclockwise until the  
desired minimum position has been attained.  
CAUTION: When proceeding with Steps 9 and 10, extreme  
care must be exercised while turning both the set  
point and minimum position adjusting screws to  
prevent twisting them off.  
9. The enthalpy set point for the dampers may now be set by  
selecting the desired set point from graph in Figure 7. For  
a single enthalpy economizer, carefully turn the set point  
11. Replace the filter section access panel.  
FIG. 7 - ENTHALPY SET POINT ADJUSTMENT  
TABLE 4 - STATIC RESISTANCES  
EXTERNAL STATIC PRESSURE DROP  
RESISTANCE, IWG  
CFM  
DESCRIPTION  
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000  
Economizer1, 2  
0.07  
0.06  
0.08  
0.07  
0.09  
0.08  
0.11  
0.09  
0.13  
0.10  
0.15  
0.11  
0.17  
0.12  
0.20  
0.14  
0.23  
0.16  
0.26  
0.19  
0.30  
0.22  
Bottom Duct Connections1  
1
2
Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.  
The pressure thru the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 0.25 IWG, the unit will deliver less CFM  
8
Unitary Products Group  
530.18-N8Y  
TABLE 5 - PHYSICAL DATA  
UNIT SIZE  
048 060  
12 x 10 12 x 10  
WEIGHTS  
MODELS  
036  
072  
12 x 10 12 x 11  
CORNER WEIGHTS*  
(location, lbs., see figure 8)  
UNIT  
SIZE  
(heat)  
UNIT  
WEIGHT*  
(lbs.)  
CENTRIFUGAL BLOWER  
(Dia. x Wd. in.)  
FAN MOTOR HP  
(Direct-Drive)  
FAN MOTOR HP  
(Belt-Drive)  
ROWS DEEP  
FINS PER INCH  
FACE AREA (Sq. Ft.)  
EVAP.  
BLOWER  
1
3
"A"  
180  
180  
193  
193  
200  
200  
186  
186  
"B"  
172  
177  
185  
190  
192  
197  
209  
214  
"C"  
133  
138  
145  
150  
150  
155  
201  
206  
"D"  
140  
140  
152  
152  
158  
158  
179  
179  
2
4
1
1
036 (40 Mbh)  
036 (79 Mbh)  
048 (60 Mbh)  
048 (99 Mbh)  
060 (79 Mbh)  
060 (99 Mbh)  
072 (79 Mbh)  
072 (99 Mbh)  
625  
635  
675  
685  
700  
710  
775  
785  
112  
112  
112  
112  
3
13  
3.6  
3
13  
4.3  
3
13  
5.1  
4
13  
5.1  
EVAP.  
COIL  
COMPR.  
TYPE  
HERMETICALLY SEALED  
SCROLL TYPE  
24  
24  
24  
24  
PROPELLER DIA. (in.)  
FAN MOTOR HP  
NOM. CFM TOTAL  
COND.  
FAN  
1
1
1
1
4
4
4
4
3,400 3,400 3,400 3,300  
ROWS DEEP  
FINS PER INCH  
FACE AREA (Sq. Ft.)  
1
16  
1
16  
1
22  
2
16  
16.7  
COND.  
COIL  
17.1  
17.1  
17.1  
OPTIONS / ACCESSORIES WEIGHTS (lbs.)  
QUANTITY PER UNIT  
(15" x 20" x 1")  
QUANTITY PER UNIT  
(14" X 25" X 1")  
TOTAL FACE AREA  
(sq. ft.)  
2
1
2
1
2
1
2
1
Economizer  
50  
26  
AIR  
FILTERS  
(SEE NOTE)  
Motorized Outdoor  
Air Damper  
6.3  
6.3  
6.3  
6.3  
Barometric Relief/Fixed  
Outdoor Air Intake Damper  
10  
REFRIGERANT 22  
(lbs./oz.)  
CHARGE  
5/8  
6/8  
6/8  
10/0  
Roof Mounting Curb  
Belt-Drive Blower  
92  
5
NOTE: Filter racks are adapted for 1" or 2" thick filters.  
CORNER C  
CONDENSER  
COIL END  
BACK  
* Weight = Unit + Economizer  
APPROXIMATE  
CENTER OF  
CORNER B  
GRAVITY  
CORNER D  
FRONT  
1
82 “  
4
7
44 “  
X
8
Y
CORNER A  
DIM. 3-5 TON 6 TON  
Y
X
19-3/4"  
40-3/4"  
22"  
44"  
FIG 8 - CENTER OF GRAVITY  
- 3 Thru 6 Ton w/Direct-Drive Blower  
TABLE 6 - SUPPLY AIR PERFORMANCE  
GAS HEAT VALUES SHOWN @ 230/460/575 Volts  
- Side Duct Connections  
Available External Static Pressure - IWG*  
UNIT  
SIZE  
MOTOR  
SPEED  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
1.00  
CFM  
Watts  
CFM  
Watts  
CFM  
Watts  
CFM  
Watts  
CFM  
Watts  
CFM  
Watts  
CFM  
Watts  
CFM  
Watts  
CFM  
Watts  
HI  
MED  
LOW  
HI  
MED  
LOW  
-
-
-
-
1699  
1582  
1421  
1868  
1714  
1604  
825  
750  
670  
910  
785  
715  
1650  
1524  
1367  
1795  
1650  
1541  
785  
720  
650  
880  
765  
695  
1570  
1410  
1315  
1722  
1589  
1490  
755  
690  
620  
845  
735  
670  
1430  
1324  
1246  
1635  
1508  
1416  
725  
650  
605  
820  
705  
645  
1360  
1260  
1185  
1544  
1407  
1337  
700  
630  
590  
790  
675  
620  
1280  
1185  
1110  
1419  
1306  
1230  
680  
610  
570  
765  
645  
595  
1180  
1100  
1020  
1300  
1195  
1120  
655  
590  
545  
740  
625  
575  
036  
048  
1684  
1487  
1996  
1804  
1681  
800  
710  
960  
838  
760  
1631  
1464  
1933  
1765  
1640  
780  
690  
936  
810  
738  
HI  
MED  
LOW  
2400  
2290  
2150  
1155  
1105  
1020  
2338  
2214  
2100  
1125  
1065  
990  
2274  
2145  
2029  
1095  
1030  
950  
2167  
2071  
1965  
1045  
990  
910  
2096  
1990  
1905  
1010  
950  
880  
1990  
1911  
1816  
980  
920  
838  
1887  
1828  
1724  
945  
885  
800  
1771  
1724  
1644  
905  
835  
770  
1629  
1604  
1531  
855  
798  
710  
060  
072  
HI  
2461  
1480  
2402  
1440  
2361  
1395  
2260  
1350  
2178  
1305  
2101  
1260  
2000  
1205  
1914  
1155  
1830  
1110  
NOTE: For 208 volts,multiply values by 0.95.  
*Includes allowances for a wet evaporator coil, 1" filters and gas fired heat exchangers. Refer to Table 8 for static resistance values on applications other than side duct airflows.  
TABLE 7 - MOTOR AND DRIVE DATA - Belt-Drive Blower  
ADJUSTABLE  
MOTOR PULLEY  
FIXED  
BLOWER PULLEY  
PITCH  
BORE  
DIA.  
MOTOR*  
BELT  
PITCH  
BLOWER  
RANGE  
(RPM)  
UNIT  
SIZE  
PITCH  
BORE  
DIA.  
FRAME SERVICE  
DESIG-  
HP  
RPM  
LENGTH  
(in.)  
SIZE  
FACTOR  
(in.)  
(in.)  
NATION  
(in.)  
(in.)  
036  
048  
060  
072  
780 - 1090 1-1/2  
790 - 1120 1-1/2  
850 - 1220 1-1/2  
900 - 1250 1-1/2  
1725  
1725  
1725  
1725  
56  
56  
56  
56  
1.15  
1.15  
1.15  
1.15  
2.4 - 3.4  
2.4 - 3.4  
2.4 - 3.4  
2.8 - 3.8  
7/8  
7/8  
7/8  
7/8  
5.7  
5.7  
5.2  
5.2  
1
1
1
1
37.3  
37.3  
37.3  
37.3  
A36  
A36  
A36  
A36  
*All motors have solid bases and are inherently protected. These motors can be selected to operate into their service factor because they are located in the moving air, upstream of any  
Unitary Products Group  
9
530.18-N8Y  
- SUPPLY AIR PERFORMANCE - 3 & 4 Ton w/Belt-Drive Blower  
TABLE 8  
3 TON - SIDE DUCT CONNECTIONS @ 230/460/575 VOLTS  
Available External Static Pressure - IWG*  
0.40 0.50 0.60  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.20  
0.30  
0.70  
0.80  
2000  
1900  
1800  
1700  
1600  
1500  
1400  
1300  
1200  
843  
817  
790  
-
-
-
-
-
-
860  
775  
700  
-
-
-
-
-
-
880  
854  
828  
802  
-
-
-
-
-
925  
850  
760  
670  
-
-
-
-
-
919  
893  
867  
840  
818  
-
-
-
-
1005  
920  
840  
745  
665  
-
-
-
-
956  
930  
906  
881  
858  
842  
833  
-
1065  
995  
905  
815  
740  
695  
650  
-
993  
970  
944  
920  
898  
882  
867  
858  
847  
1145  
1065  
980  
900  
820  
755  
705  
665  
640  
1030  
1008  
985  
961  
940  
922  
904  
893  
880  
1195  
1125  
1040  
970  
890  
835  
765  
725  
680  
1067  
1046  
1025  
1001  
980  
962  
942  
932  
916  
1235  
1170  
1100  
1030  
950  
895  
820  
785  
730  
036  
-
-
Available External Static Pressure - IWG*  
1.10 1.20 1.30  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.90  
1.00  
1.40  
1.50  
2000  
1900  
1800  
1700  
1600  
1500  
1400  
1300  
1200  
1103  
1085  
1064  
1040  
1020  
1003  
982  
1270  
1210  
1145  
1075  
1005  
945  
880  
835  
780  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1102  
1081  
1060  
1044  
1024  
1010  
992  
1180  
1115  
1050  
995  
920  
870  
815  
1121  
1100  
1086  
1067  
1053  
1034  
1140  
1085  
1035  
965  
920  
855  
036  
-
1107  
1099  
1080  
1000  
960  
905  
970  
953  
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.  
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND THE HEAT EXCHANGERS. REFER TO THE STATIC RESISTANCES TABLE FOR RESISTANCE VALUES  
ON APPLICATIONS OTHER THAN GAS / ELECTRIC UNITS WITH SIDE DUCT AIRFLOWS.  
4 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts  
Available External Static Pressure - IWG*  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
2000  
1900  
1800  
1700  
1600  
1500  
1400  
1300  
1200  
843  
817  
790  
-
-
-
-
-
-
860  
775  
700  
-
-
-
-
-
-
880  
854  
828  
802  
-
-
-
-
-
925  
850  
760  
670  
-
-
-
-
-
919  
893  
867  
840  
818  
-
-
-
-
1005  
920  
840  
745  
665  
-
-
-
-
956  
930  
906  
881  
858  
842  
833  
-
1065  
995  
905  
815  
740  
695  
650  
-
993  
970  
944  
920  
898  
882  
867  
858  
847  
1145  
1065  
980  
900  
820  
755  
705  
665  
640  
1030  
1008  
985  
961  
940  
922  
904  
893  
880  
1195  
1125  
1040  
970  
890  
835  
765  
725  
680  
1067  
1046  
1025  
1001  
980  
962  
942  
932  
916  
1235  
1170  
1100  
1030  
950  
895  
820  
785  
730  
048  
-
-
Available External Static Pressure - IWG*  
1.10 1.20 1.30  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.90  
1.00  
1.40  
1.50  
2000  
1900  
1800  
1700  
1600  
1500  
1400  
1300  
1200  
1103  
1085  
1064  
1040  
1020  
1003  
982  
1270  
1210  
1145  
1075  
1005  
945  
880  
835  
780  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1102  
1081  
1060  
1044  
1024  
1010  
992  
1180  
1115  
1050  
995  
920  
870  
815  
1121  
1100  
1086  
1067  
1053  
1034  
1140  
1085  
1035  
965  
920  
855  
048  
-
1107  
1099  
1080  
1000  
960  
905  
970  
953  
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.  
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES ON CONNECTIONS  
OTHER THAN SIDE DUCT AIRFLOWS.  
10  
Unitary Products Group  
530.18-N8Y  
- SUPPLY AIR PERFORMANCE - 5 & 6 Ton w/Belt-Drive Blower  
TABLE 9  
5 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts  
Available External Static Pressure - IWG*  
0.40 0.50 0.60  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.20  
0.30  
0.70  
0.80  
2500  
2400  
2300  
2200  
2100  
2000  
1900  
1800  
1700  
1600  
1500  
1059  
1032  
1005  
980  
930  
877  
-
-
-
-
-
1560  
1405  
1260  
1160  
1060  
950  
-
-
-
-
-
1077  
1054  
1024  
1002  
957  
908  
-
-
-
-
-
1590  
1470  
1275  
1170  
1070  
975  
-
-
-
-
-
1095  
1074  
1049  
1022  
983  
941  
894  
855  
-
1630  
1525  
1370  
1190  
1080  
1000  
885  
815  
-
1114  
1094  
1069  
1044  
1010  
976  
940  
903  
884  
864  
-
1650  
1560  
1440  
1250  
1100  
1020  
940  
860  
815  
770  
-
1134  
1116  
1090  
1066  
1039  
1009  
980  
950  
925  
908  
882  
1660  
1595  
1475  
1350  
1160  
1050  
980  
905  
850  
805  
740  
1158  
1140  
1116  
1090  
1064  
1040  
1014  
988  
1685  
1620  
1505  
1410  
1260  
1100  
1020  
940  
1181  
1167  
1142  
1117  
1092  
1070  
1047  
1022  
1001  
987  
1720  
1640  
1535  
1440  
1340  
1225  
1095  
970  
060  
964  
948  
926  
880  
835  
780  
910  
870  
830  
-
-
-
-
965  
Available External Static Pressure - IWG*  
1.10 1.20 1.30  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.90  
1.00  
1.40  
1.50  
2500  
2400  
2300  
2200  
2100  
2000  
1900  
1800  
1700  
1600  
1500  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1193  
1170  
1148  
1121  
1100  
1079  
1058  
1035  
1020  
1004  
1665  
1580  
1480  
1385  
1285  
1180  
1060  
960  
1202  
1180  
1155  
1133  
1110  
1090  
1071  
1056  
1038  
1620  
1530  
1425  
1340  
1240  
1135  
1030  
965  
1190  
1169  
1143  
1122  
1103  
1088  
1070  
1475  
1385  
1280  
1190  
1100  
1035  
925  
060  
1205  
1178  
1158  
1134  
1118  
1101  
1445  
1330  
1240  
1140  
1065  
980  
-
-
1222  
1196  
1164  
1145  
1130  
1375  
1295  
1175  
1105  
1045  
1197  
1170  
1158  
1205  
1130  
1075  
-
900  
860  
1198  
1184  
1150  
1110  
880  
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.  
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES ON CONNECTIONS  
OTHER THAN SIDE DUCT AIRFLOWS.  
6 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts  
Available External Static Pressure - IWG*  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
3200  
3000  
2800  
2600  
2400  
2200  
2000  
1800  
1150  
1100  
1045  
985  
930  
-
2325  
2010  
1700  
1425  
1240  
-
1182  
1129  
1074  
1015  
958  
905  
-
2425  
2090  
1780  
1475  
1300  
1070  
-
1212  
1157  
1102  
1045  
990  
933  
-
2525  
2150  
1850  
1540  
1350  
1160  
-
-
-
-
-
-
-
-
-
-
-
1185  
1131  
1075  
1020  
965  
919  
-
2225  
1940  
1630  
1400  
1210  
1025  
-
1215  
1160  
1103  
1051  
997  
2290  
2025  
1715  
1430  
1250  
1100  
925  
1242  
1190  
1135  
1081  
1028  
982  
2360  
2075  
1760  
1490  
1285  
1130  
1005  
1217  
1163  
1111  
1060  
1014  
968  
2130  
1825  
1600  
1325  
1160  
1030  
072  
-
-
-
-
950  
909  
-
-
-
-
939  
Available External Static Pressure - IWG*  
1.10 1.20 1.30  
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts  
UNIT  
SIZE  
AIR FLOW  
CFM  
0.90  
1.00  
1.40  
1.50  
3200  
3000  
2800  
2600  
2400  
2200  
2000  
1800  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1245  
1193  
1142  
1090  
1045  
998  
2190  
1920  
1675  
1380  
1175  
1050  
1222  
1173  
1124  
1077  
1028  
1990  
1730  
1450  
1200  
1060  
1250  
1205  
1155  
1109  
1058  
2060  
1800  
1550  
1275  
1060  
-
-
072  
1234  
1186  
1140  
1087  
1885  
1640  
1360  
1075  
-
-
-
1217  
1170  
1118  
1710  
1460  
1150  
1249  
1205  
1148  
1775  
1545  
1250  
1235  
1176  
1600  
1360  
NOTE: FOR 208 VOLTS, MULTIPLY VALUES BY 0.95.  
*INCLUDES ALLOWANCES FOR A WET EVAPORATOR COIL, 1" FILTERS, AND GAS-FIRED HEAT EXCHANGERS. REFER TO TABLE 8 FOR RESISTANCE VALUES ON CONNECTIONS  
OTHER THAN SIDE DUCT AIRFLOWS.  
Unitary Products Group  
11  
530.18-N8Y  
TABLE 10 - ELECTRICAL DATA (BASIC UNIT)w/Direct-Drive Blower Motor  
VOLTAGE  
LIMITATIONS  
(SEE NOTE 1)  
SUPPLY  
MAX.  
FUSE  
SIZE,  
MAX.  
HACR  
BREAKER  
SIZE,  
SCROLL  
COMPRESSOR  
COND.  
FAN  
MOTOR,  
FLA  
AIR  
BLOWER  
MOTOR,  
FLA  
MINIMUM  
CIRCUIT  
AMPACITY  
UNIT  
SIZE  
POWER  
SUPPLY  
(SEE NOTE 2)  
MIN.  
MAX.  
RLA  
LRA  
AMPS  
AMPS  
208/230-1-60  
208/230-3-60  
460-3-60  
187  
187  
414  
518  
187  
187  
414  
518  
253  
253  
504  
630  
253  
253  
504  
630  
18.0  
11.4  
6.2  
105.0  
90.0  
45.0  
36.0  
140.0  
105.0  
55.0  
1.3  
1.3  
0.8  
0.8  
1.3  
1.3  
0.8  
0.8  
4.4  
4.4  
2.2  
2.2  
5.0  
5.0  
2.2  
2.2  
28.2  
20.0  
10.8  
9.3  
36.8  
23.9  
11.9  
10.1  
45  
30  
15  
15  
60  
35  
15  
15  
45  
30  
15  
-
60  
35  
15  
-
036  
048  
575-3-60  
5.0  
208/230-1-60  
208/230-3-60  
460-3-60  
24.4  
14.1  
7.1  
575-3-60  
5.6  
44.0  
208/230-1-60  
208/230-3-60  
460-3-60  
575-3-60  
208/230-3-60  
460-3-60  
187  
187  
414  
518  
187  
414  
518  
253  
253  
504  
630  
253  
504  
630  
28.9  
16.0  
8.0  
165.0  
125.0  
67.0  
1.3  
1.3  
0.8  
0.8  
1.3  
0.8  
0.8  
6.6  
6.6  
3.3  
3.3  
6.8  
3.6  
3.6  
44.0  
27.9  
14.1  
12.1  
33.5  
17.2  
14.7  
70  
40  
20  
15  
50  
25  
20  
70  
40  
20  
-
50  
25  
-
060  
072  
6.4  
50.0  
20.3  
10.2  
8.2  
146.0  
73.0  
58.4  
575-3-60  
NOTES: 1. Utilization Range “A” in accordance with ARI Standard 110.  
2. Dual element, time delay type.  
TABLE 11 - ELECTRICAL DATA (BASIC UNIT)w/Belt-Drive Blower Motor  
VOLTAGE  
LIMITATIONS  
(SEE NOTE 1)  
SUPPLY  
MAX.  
FUSE  
SIZE,  
MAX.  
HACR  
BREAKER  
SIZE,  
SCROLL  
COMPRESSOR  
COND.  
FAN  
MOTOR,  
FLA  
AIR  
BLOWER  
MOTOR,  
FLA  
MINIMUM  
CIRCUIT  
AMPACITY  
UNIT  
SIZE  
POWER  
SUPPLY  
(SEE NOTE 2)  
MIN.  
MAX.  
RLA  
LRA  
AMPS  
AMPS  
208/230-1-60  
208/230-3-60  
460-3-60  
187  
187  
414  
518  
187  
187  
414  
518  
253  
253  
504  
630  
253  
253  
504  
630  
18.0  
11.4  
6.2  
105.0  
90.0  
45.0  
36.0  
140.0  
105.0  
55.0  
1.3  
1.3  
0.8  
0.8  
1.3  
1.3  
0.8  
0.8  
5.3  
5.3  
3.1  
3.1  
8.6  
5.2  
2.6  
2.0  
29.1  
20.9  
11.7  
10.2  
40.4  
24.1  
12.3  
9.9  
45  
30  
15  
15  
60  
35  
15  
15  
45  
30  
15  
-
60  
35  
15  
-
036  
048  
575-3-60  
5.0  
208/230-1-60  
208/230-3-60  
460-3-60  
24.4  
14.1  
7.1  
575-3-60  
5.6  
44.0  
208/230-1-60  
208/230-3-60  
460-3-60  
575-3-60  
208/230-3-60  
460-3-60  
187  
187  
414  
518  
187  
414  
518  
253  
253  
504  
630  
253  
504  
630  
28.9  
16.0  
8.0  
165.0  
125.0  
67.0  
1.3  
1.3  
0.8  
0.8  
1.3  
0.8  
0.8  
8.6  
6.0  
3.0  
2.4  
7.3  
3.7  
2.8  
46.0  
27.3  
13.8  
11.2  
34.0  
17.3  
13.9  
70  
40  
20  
15  
50  
25  
20  
70  
40  
20  
-
50  
25  
-
060  
072  
6.4  
50.0  
20.3  
10.2  
8.2  
146.0  
73.0  
58.4  
575-3-60  
NOTES: 1. Utilization Range “A” in accordance with ARI Standard 110.  
2. Dual element, time delay type.  
TABLE 12 - SUPERHEAT CHARGING TABLE FOR MODEL 036  
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON  
OUTDOOR  
TEMPERATURE,  
°F  
INDOOR WB TEMPERATURE, °F  
55  
57  
59  
28  
23.3  
18.5  
13.8  
9.0  
6.7  
-
61  
29.2  
24.9  
20.5  
16.2  
11.8  
9.1  
6.3  
5.3  
-
63  
30.4  
26.5  
22.5  
18.5  
14.6  
11.4  
8.3  
6.8  
5.4  
-
65  
31.6  
28.1  
24.5  
20.9  
17.4  
13.8  
10.3  
8.4  
67  
32.8  
29.6  
26.5  
23.3  
20.1  
16.2  
12.3  
10.0  
7.7  
69  
71  
73  
75  
65  
70  
25.6  
26.8  
33.3  
30.6  
27.8  
25.0  
22.3  
18.9  
15.6  
13.4  
11.2  
9.0  
33.9  
31.5  
29.1  
26.8  
24.4  
21.7  
18.9  
16.8  
14.7  
12.6  
10.5  
34.4  
32.4  
30.5  
28.5  
26.6  
24.4  
22.2  
20.2  
18.2  
16.2  
14.1  
34.9  
33.4  
31.8  
30.3  
28.7  
27.1  
25.6  
23.6  
21.7  
19.8  
17.8  
20.1  
21.7  
75  
14.6  
16.6  
80  
9.0  
11.4  
85  
-
-
-
-
-
-
-
6.3  
90  
-
-
-
-
-
-
95  
100  
105  
110  
115  
-
-
6.5  
-
-
-
5.4  
-
-
-
-
-
6.8  
12  
Unitary Products Group  
530.18-N8Y  
TABLE 13 - SUPERHEAT CHARGING TABLE FOR MODEL 048  
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON  
INDOOR WB TEMPERATURE, °F  
OUTDOOR  
TEMPERATURE,  
°F  
55  
57  
59  
22.2  
18.7  
15.2  
11.7  
8.3  
6.6  
-
61  
24.3  
20.8  
17.4  
13.9  
10.4  
8.2  
5.9  
5.3  
-
63  
26.3  
22.9  
19.5  
16.0  
12.6  
9.8  
7.0  
6.2  
5.4  
-
65  
28.4  
25  
67  
30.5  
27.1  
23.7  
20.3  
16.9  
13.0  
9.1  
69  
71  
73  
75  
65  
70  
18.1  
20.1  
31.7  
28.7  
25.6  
22.6  
19.5  
16.1  
12.6  
11.1  
9.5  
32.9  
30.2  
27.5  
24.8  
22.1  
19.1  
16.1  
14.2  
12.3  
10.5  
8.6  
34.2  
31.8  
29.5  
27.1  
24.7  
22.2  
19.6  
17.4  
15.2  
13.0  
10.7  
35.4  
33.4  
31.4  
29.3  
27.3  
25.2  
23.1  
20.5  
18.0  
15.4  
12.9  
14.5  
16.6  
75  
11.0  
13.1  
21.6  
18.2  
14.8  
11.4  
8.0  
7.0  
6.0  
5.0  
-
80  
7.5  
9.6  
85  
-
-
-
-
-
-
-
6.1  
90  
-
-
-
-
-
-
95  
100  
105  
110  
115  
-
7.9  
-
6.7  
-
-
5.5  
8.0  
-
-
-
-
6.4  
TABLE 14 - SUPERHEAT CHARGING TABLE FOR MODEL 060  
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON  
OUTDOOR  
TEMPERATURE,  
°F  
INDOOR WB TEMPERATURE, °F  
55  
57  
22.0  
18.9  
15.9  
12.8  
9.7  
6.6  
-
59  
24.0  
21.0  
18.1  
15.1  
12.2  
8.9  
5.7  
-
61  
25.9  
23.1  
20.3  
17.4  
14.6  
11.3  
7.9  
6.5  
5.1  
-
63  
27.8  
25.2  
22.5  
19.8  
17.1  
13.6  
10.1  
8.2  
65  
29.8  
27.2  
24.7  
22.1  
19.6  
16.0  
12.4  
9.9  
67  
31.7  
29.3  
26.9  
24.5  
22.0  
18.3  
14.6  
11.6  
8.6  
69  
71  
73  
75  
65  
70  
20.1  
32.5  
30.3  
28.1  
25.9  
23.7  
20.6  
17.4  
14.6  
11.8  
9.0  
33.3  
31.3  
29.3  
27.3  
25.3  
22.8  
20.3  
17.6  
15.0  
12.3  
9.7  
34.1  
32.3  
30.5  
28.7  
27.0  
25.0  
23.1  
20.6  
18.1  
15.7  
13.2  
35.0  
33.4  
31.8  
30.2  
28.6  
27.3  
25.9  
23.6  
21.3  
19.0  
16.7  
16.9  
75  
13.7  
80  
10.4  
85  
7.2  
90  
-
-
-
-
-
-
95  
100  
105  
110  
115  
-
-
-
6.3  
7.4  
-
-
-
-
5.6  
-
-
-
-
-
-
6.1  
TABLE 15 - SUPERHEAT CHARGING TABLE FOR MODEL 072  
SUPERHEAT AT SCROLL COMPRESSOR SUCTION, °F, AIRFLOW = 400 CFM/TON  
OUTDOOR  
TEMPERATURE,  
°F  
INDOOR WB TEMPERATURE, °F  
55  
57  
18.0  
14.9  
11.7  
8.5  
5.3  
5.1  
-
59  
20.9  
17.8  
14.8  
11.7  
8.7  
7.7  
6.8  
6.2  
5.6  
-
61  
23.7  
20.8  
17.9  
15.0  
12.0  
10.4  
8.7  
63  
26.5  
23.7  
21.0  
18.2  
15.4  
13.0  
10.6  
9.2  
65  
67  
69  
71  
73  
75  
65  
70  
15.2  
29.3  
26.7  
24.1  
21.4  
18.8  
15.7  
12.6  
10.7  
8.9  
32.1  
29.6  
27.2  
24.7  
22.2  
18.4  
14.5  
12.3  
10.0  
7.8  
33.4  
31.0  
28.7  
26.3  
23.9  
20.7  
17.5  
15.4  
13.4  
11.3  
9.2  
34.7  
32.4  
30.2  
27.9  
25.7  
23.1  
20.4  
18.5  
16.7  
14.8  
12.9  
36.0  
33.8  
31.7  
29.6  
27.4  
25.4  
23.4  
21.7  
20.0  
18.3  
16.6  
37.3  
35.3  
33.2  
31.2  
29.2  
27.8  
26.3  
24.8  
23.3  
21.8  
20.4  
11.9  
75  
8.6  
80  
5.2  
85  
-
-
-
-
-
-
-
90  
95  
100  
105  
110  
115  
-
7.7  
-
6.7  
7.8  
-
5.6  
6.4  
7.1  
-
-
-
-
5.2  
5.5  
Unitary Products Group  
13  
530.18-N8Y  
(Direct-Drive Units)  
SCROLL COMPR.  
ACCESS  
1112  
3
1112  
458  
1712  
612  
778  
All dimensions are in inches. They are sub-  
ject to change without notice. Certified di-  
mensions will be provided upon request.  
1712  
UTILITIES ENTRY DATA  
KNOCKOUT  
REAR VIEW  
SIDE SUPPLY AND RETURN  
HOLE  
SIZE  
(DIA.)  
USED FOR  
AIR FLOW LEGEND  
Control Wiring  
(Side or Bottom)**  
Power Wiring  
(Side or Bottom)  
Gas Piping (Front)  
Gas Piping (Bottom)  
A
B
7/8" *  
2" *  
DUCT COVERS - Units are shipped with all air duct  
openings covered.  
For side duct applications;  
1. Remove and discard the supply and return air duct  
covers.  
2. Connect ductwork to duct flanges on the rear of the  
unit.  
RETURN AIR  
SUPPLY AIR  
C
D
1-5/8"  
1-1/2"  
OUTDOOR AIR  
*Knockouts in the bottom of the unit can be located by the slice  
in the insulation.  
**Do not remove the 2" knockout ring.  
For bottom duct applications;  
OUTDOOR AIR  
(Economizer)  
1. Remove the side supply air duct cover to gain  
access to the bottom supply air knockout panel.  
2. Remove and discard the bottom knockout panel.  
3. Replace the side duct cover.  
4. With filter section access panel removed from the  
unit, remove and discard the bottom return air  
knockout panel.  
3
“ CONDENSATE  
4
DRAIN  
(must be trapped)  
5. Replace the filter access panel.  
2712  
1934  
CLEARANCES  
Front  
32"  
12" (Less Economizer)  
36" (With Economizer or Fixed  
Air/Motorized Air Damper)  
Back  
4478  
1912  
24" (Less Economizer)  
36" (With Economizer)  
24"  
DETAIL “A”  
Left Side (Filter Access)  
UNIT WITH ECONOMIZER RAIN HOOD  
Right Side (Cond. Coil)  
Below Unit1  
20"  
Above Unit2  
72" (For Condenser Air Discharge)  
1
2
Units may be installed on combustible floors made from wood or class A, B or C  
roof covering material (Applicable in the U.S.A. only).  
Units must be installed outdoors. Overhanging structures or shrubs should not  
obstruct the outdoor coil nor the fan outlet.  
3078  
1918  
1014  
NOTE: A 1" clearance must be provided between any combustible material and the  
supply air ductwork for a distance of 3 feet from the unit.  
The products of combustion must not be allowed to accumulate within a confined  
space and recirculate.  
Locate unit so that the vent air outlet hood is at least:  
Three (3) feet above any forced air inlet located within 10 horizontal feet  
(excluding those integral to the unit).  
DIMENSION "A"  
FIXED  
312  
B
A
814  
OUTDOOR  
12  
AIR DAMPER  
438  
MOTORIZED  
DAMPER  
Four (4) feet below, 4 horizontal feet from, or 1 foot above any door or gravity air  
inlet into the building.  
1
16 ⁄  
"A"  
2
4478  
DETAIL “B”  
Four (4) feet from electric meters, gas meters, regulators and relief equipment.  
UNIT WITH FIXED OUTDOOR  
AIR/MOTORIZED DAMPER RAIN HOOD  
FIG. 9 - DIMENSIONS AND CLEARANCE (3, 4, 5 & 6 TON)  
14  
Unitary Products Group  
530.18-N8Y  
OPERATION  
COOLING SYSTEM  
When “TH1" on the thermostat closes, the draft motor relay  
”DMR" or "DMC" is energized. The “DMR” or "DMC" power  
contacts close which energizes the line voltage draft motor. As  
the speed of the draft motor reaches approximately 2500 RPM,  
the centrifugal switch contact “CS” located on the end of the  
draft motor shaft closes to power the ignition control “IC”.  
The cooling section is a complete factory package utilizing an  
air-cooled condenser. The system is factory-charged with  
Refrigerant-22.  
The scroll compressor is hermetically sealed and internally  
sprung. The scroll compressors have inherent (internal)  
protection. If there is an abnormal temperature rise in the scroll  
compressor, the protector will open to shut down the scroll  
compressor.  
After 15 seconds, the "IC" will start the ignitor sparking and will  
open the redundant valve located inside the main gas valve  
“GV” to allow a flow of gas to only thecarryover tube. SeeFigure  
10. Only after the pilot flame has been ignited and the presence  
of pilot flame detected at the “IC” by a signal sent back through  
the flame sensor is sparking terminated and the main gas valve  
opened.  
COOLING SEQUENCE OF OPERATION  
Single-Stage Cooling: When the thermostat calls for “cooling”,  
“R” is closed to “G” and “Y1" (wiring schematic) which  
completes the low voltage control circuit, immediately  
energizing the scroll compressor, condenser fan motor and  
blower motor simultaneously.  
REDUNDANT  
VALVE  
MAIN VALVE  
Two-Stage Cooling: A two-stage cooling thermostat may be  
used if the unit has an economizer. First-stage cooling is  
provided by the economizer - if the outdoor air enthalpy is  
acceptable, and second-stage cooling is provided by the scroll  
compressor. Jumper wire J1 must be removed. Refer to the unit  
wiring diagram.  
GAS MAIN  
GAS  
TO MAIN  
BURNER  
VALVE  
TO PILOT BURNER  
After the thermostat is satisfied and opens, all components will  
stop simultaneously.  
FIG. 10 - GAS VALVE PIPING  
CONTINUOUS BLOWER - Continuous blower operation is  
possible by closing the R to G circuit on the thermostat.  
Gas flows into each of the main burners and is ignited from the  
carryover tube flame.  
SAFETY CONTROLS (Cooling)  
The "IC" will try for 85 seconds to ignite the pilot carryover tube.  
If the "IC" fails to detect a pilot flame during the 85 seconds, it  
will close the redundant valve. After a 5 minute purge period,  
the "IC" will again try to light the pilot carryover tube. This will  
continue continuously until the "IC" detects a pilot flame.  
The refrigerant system is equipped with the following safety  
controls:  
1. ASuction Line Freezestat to protect against low evaporator  
temperatures due to a low air flow or a low return air  
temperature.  
If, after detecting a pilot flame and opening the main gas valve,  
the "IC" looses pilot flame indication, it will close both the main  
and redundant gas valves. The "IC" will start the above  
sequence over until a pilot flame is detected and it will open the  
main gas valve again.  
2. AHigh Pressure Cutout Switch to protect against excessive  
discharge pressures due to a blocked condenser coil or a  
condenser motor failure.  
The "IC" will only allow 16 pilot flameouts and a single rollout  
switch opening per thermostat cycle. After 16 pilot flameouts or  
a single rollout switch opening, the "IC" closes both the main  
and redundant gas valves. The "IC" requires resetting the  
thermostat or removal of it’s power lead coming from the draft  
motor to reset the "IC" and return it to the above sequence of  
operation.  
3. ALow Pressure Switch to protect against loss of refrigerant  
charge.  
If either one of the above safety controls opens, the refrigerant  
system will be locked out. The lock out of the system can be  
reset by opening the 24V circuit either at the room thermostat  
or at the unit disconnect.  
At the same time power was supplied to the “DMR” or "DMC",  
a parallel circuit activates the time delay ("BT" or "ETD"). The  
"BT" or "ETD" closes in approximately 35 seconds and starts  
the circulating air blower by energizing the blower interlock  
relay “K3", thus closing the ”K3-2" contact and energizing the  
blower relay “BR”.  
HEATING SEQUENCE OF OPERATION  
The following sequence describes the operation of the gasheat  
section.  
CONTINUOUS BLOWER: With the room thermostat switch set  
to “ON”, the supply air blower will operate continuously. The  
normally closed blower interlock relay contact “K3-1" provides  
24voltpowertothe blowerrelay ”BR". TheBRpowercontacts  
close and the blower motor operates.  
When the heating cycle is complete, “TH-1" opens  
de-energizing the “IC”, thus closing the redundant and main  
gas valves. The blower motor and the draft motor continue to  
run for a short period after the furnace is shut down until the  
"BT" or "ETD"” opens (in approximately 25 seconds)  
de-energizing the “K3", ”BR" and "DMR" or "DMC" relays.  
INTERMITTENT BLOWER: With the room thermostat system  
switch set to the “AUTO” or “HEAT” position and the fan switch  
set to “AUTO”, the supply air blower will operate after the room  
thermostat calls for heat and the air in the gas heat  
compartment has achieved a pre-set temperature.  
SAFETY CONTROLS (Heating)  
The control circuit includes the following safety controls:  
1. Limit Control (LS). This control is located inside the heat  
exchanger compartment and is set to open at the  
temperature indicated in Table 16. It resets automatically.  
Unitary Products Group  
15  
530.18-N8Y  
The limit switch operates when a high temperature  
operation of the main burners, a signal is sent to the ignition  
control to close the main gas valve.  
condition, caused by inadequate supply air flow, occurs  
shutting down the ignition control and closing the main gas  
valve.  
5. Rollout Switch. This switch is located in the burner  
vestibule. In the event of a sustained main burner flame  
rollout, it shuts off the ignition control and closes the main  
gas valve.  
TABLE 16 - LIMIT CONTROL SETTING  
Capacity, MBH  
Limit Control  
Units  
(Tons)  
Opens, °F  
Input  
50  
75  
100  
125  
100  
125  
100  
125  
Output  
6. Auxiliary Limit Switch. This control is located inside the heat  
exchanger compartment and is set to open at 180°F. It is a  
manual reset switch. If the auxiliary limit switch trips, then  
the primary limit switch has not functioned properly.  
Replace the primary limit switch.  
3
4
3
4
5
5
6
6
40  
60  
79  
99  
79  
99  
79  
99  
165  
165  
165  
165  
165  
165  
165  
165  
HEAT ANTICIPATOR SETPOINTS  
The anticipator must be set correctly. Too high of a setting will  
result in longer heat cycles and a greater temperature swing in  
the conditioned space.  
2. Centrifugal Switch (CS-36). If the draft motor should fail, the  
centrifugal switch attached to the shaft of the motor  
prevents the ignition control and gas valve from being  
energized.  
Gas Valve  
Honeywell VR8204M  
White-Rodgers 36E36  
Anticipator Setpoint  
0.60 amp  
0.54 amp  
3. Redundant Gas Valve. This valve is an integral part of the  
main gas valve and is located up stream of the main gas  
valve. Should the main gas valve fail in the open position  
the redundant valve serves as a back up and shuts off the  
flow of gas.  
Reducing the value below the correct setpoint will give shorter  
“ON” cycles and may result in the lowering of the temperature  
within the conditioned space.  
PRE-START CHECK LIST  
4. Flame Sensor Rod. This sensor rod is located on the far  
side of the carryover tube. If the ignition control does not  
receive a signal from the flame sensor indicating that the  
pilot flame has ignited properly, the main gas valve will not  
open. If the flame sensor fails to detect the pilot flame during  
Complete the following checks before starting the unit.  
1. Check the type of gas being supplied. Be sure that it is the  
same as listed on the unit nameplate.  
2. Make sure that the vent and combustion air hoods have  
been properly installed.  
START-UP  
OPERATING INSTRUCTIONS  
MANIFOLD GAS PRESSURE ADJUSTMENT  
Small adjustments to the high-fire gas flow may be made by  
turning the pressure regulator adjusting screw on the automatic  
gas valve. Refer to Figure 11.  
CAUTION: This furnace is equipped with an intermittent pilot  
and automatic re-ignition system. DO NOT attempt  
to manually light the pilot.  
Adjust as follows:  
TO LIGHT PILOT AND MAIN BURNERS:  
1. Turn “off” electric power to unit.  
“ON”-"OFF"  
CONTROL  
PILOT ADJ.  
(UNDER  
2. Turn room thermostat to lowest setting.  
3. Turn gas valve knob to “on” position.  
4. Turn “on” electric power to unit.  
SCREW)  
HIGH FIRE ADJ.  
(UNDER SCREW)  
Honeywell  
VR8204M  
5. Set room thermostat to desired temperature.  
(If thermostat “set” temperature is above room temperature,  
pilot burner ignition will occur and, after an interval to prove  
pilot flame, main burners will ignite).  
“ON”-"OFF" CONTROL  
TO SHUT DOWN:  
PILOT ADJ.  
(UNDER  
SCREW)  
1. Turn “off” electric power to unit.  
2. Depress knob of gas valve while turning to “off” position.  
White-Rodgers  
36E36  
POST-START CHECK LIST (GAS)  
After the entire control circuit has been energized and the  
heating section is operating, make the following checks:  
PRESSURE REGULATOR  
1/2-14 NPT (OUTLET)  
MANIFOLD ADJUST. SCREW  
1. Check for gas leaks in the unit piping as well as the supply piping.  
FIG. 11 - GAS VALVES  
1. Remove the cap on the regulator. (High Fire adjusting  
screw on valve).  
2. Check for correct manifold gas pressures. See “Checking  
Gas Input”.  
3. Check the supply gas pressure. It must be within the limits  
shown on rating nameplate. Supply pressure should be  
checked with all gas appliances in the building at full fire.  
At no time should thestandby gaslinepressureexceed13",  
nor the operating pressure drop below 4.5" for natural gas  
units. If gas pressure is outside these limits, contact the  
local gas utility for corrective action.  
2. To decrease the gas pressure, turn the adjusting screw  
counterclockwise.  
3. To increase the gas pressure, turn the adjusting screw clockwise.  
NOTE: Check the unit data plate for the proper manifold pres-  
sure and orfice size of the furnace.  
16  
Unitary Products Group  
530.18-N8Y  
PILOT CHECKOUT  
TABLE 17 - BELT-DRIVE SUPPLY AIR  
MOTOR PULLEY ADJUSTMENT  
The pilot flame should envelope 3/8 inches of the end of the  
flame sensor. Refer to Figure 12. To adjust pilot flame, (1)  
remove pilot adjustment cover screw, (2) adjust the screw for  
the proper pilot flame, (3) be sure to replace cover screw after  
adjustment to prevent possible gas leakage.  
BLOWER DRIVE RANGE (RPM)  
TURNS  
OPEN*  
3 TON  
4 TON  
5 TON  
6 TON  
900  
970  
1040  
1110  
1180  
1250  
5
4
3
2
1
0
780  
842  
904  
966  
1028  
1090  
790  
856  
922  
988  
1054  
1120  
850  
924  
998  
1072  
1246  
1220  
*Pulley can be adjusted in half-turn increments.  
OPTIONAL BELT-DRIVE BLOWER  
All units with belt-drive blowers have single-speed motors. The  
variable pitch pulley on the blower motor can be adjusted to  
obtain the desired supply air CFM. Refer to Table 7 for blower  
motor and drive data. The tension on the belts should be  
adjusted as shown in Figure 14.  
FIG. 12 - PROPER FLAME ADJUSTMENT  
Put the system into operation and observe through complete  
cycle to be sure all controls function properly.  
BURNER INSTRUCTIONS  
CAUTION  
Procedure for adjusting belt tension:  
1. Loosen nut (D) from the motor mount.  
2. Never loosen nuts (C) from each other while loosening nut (D).  
3. Adjust the tension by turning bolt (B).  
Tocheckorchangeburners, pilotororifices, CLOSEMAINMANUAL  
SHUT-OFF VALVE AND SHUT OFF ALL POWER TO THE UNIT.  
1. Remove the two screws holding either end of the manifold  
to the burner supports.  
4. Do not loosen the four nuts (top and bottom) (A); unless additional tensioning  
    distance is required; immediately re-tighten these bolts if loosened.  
5. Use a belt tension checker to apply a perpendicular force to one belt at the  
     midpoint of the span as shown. The deflection force should be applied  
     until a specific deflection distance of  4mm (5/32")is obtained. To determine  
     the deflection distance from normal position, use a straight edge from  
     sheave to sheave as a reference line.  The recommended deflection force  
     is as follows:  
2. Open the union fitting in the gas supply line just upstream of the unit  
gas valve and downstream from the main manual shut-off valve.  
3. Remove the gas piping patch plate.  
4. Disconnect wiring to the gas valve and spark ignitor.  
Remove the manifold-burner gas valve assembly by lifting  
up and pulling back.  
Burners are now accessible for service.  
Reverse the above procedure to replace the assembly. Make sure  
that burners are level and seat at the rear of the heat exchanger.  
(B)  
(D)  
(A)  
BURNER AIR SHUTTER ADJUSTMENT  
(C)*  
* NEVER LOOSEN  
Tension new belts at the max. deflection force recommended for the belt  
section. Check the belt tension at least two times during the first 24 hours of  
operation. Any re-tensioning should fall between the min. and max.  
deflection force values.  
Adjust burner shutters so that a distinct, sharp, blue flame is  
obtained. Refer to Figure 13.  
6. After adjusting, re-tighten nut (D) against the motor mount taking care not  
    to loosen nuts (C).  
FIG. 14 - BELT ADJUSTMENT  
Start the supply air blower motor. Adjust the resistances in both  
the supply and the return air duct systems to balance the air  
distribution throughout the conditioned space. The job  
specifications may require that this balancing be done by  
someone other than the equipment installer.  
To check the supply air CFM after the initial balancing has been  
completed:  
FIG. 13 - TYPICAL FLAME APPEARANCE  
SUPPLY AIR BLOWER AND TEMPERATURE RISE  
ADJUSTMENTS  
Remove the (two) 516" dot plugs from the holes located on the  
filter access panel side of the unit.  
1.  
The speed of the supply air blower will depend on the required  
CFM, the unit accessories and the static resistances of both  
the supply and the return air duct systems. With this  
information, the speed for the supply air blower can be  
determined from the blower performance and accessory static  
resistance data in Tables 4,6,8 and 9.  
2. Insert at least 8" of 1/4 inch tubing into each of these holes  
for sufficient penetration into the air flow on both sides of  
the evaporator coil.  
NOTE: The tubes must be inserted and held in a position  
perpendicular to the air flow so that velocity pres-  
sure will not affect the static pressure readings.  
Knowing the required blower RPM and the blower motor HP,  
the speed setting for the supply air motor can be determined.  
3. Using an inclined manometer, determine the pressure drop  
across a dry evaporator coil. Since the moisture on an  
The setting (turns open) for the optional belt-drive supply air  
motor pulley can be determined from Table 17.  
Unitary Products Group  
17  
530.18-N8Y  
evaporator coil may vary greatly, measuring the pressure  
CHECKING GAS INPUT  
drop across a wet coil under field conditions would be  
inaccurate. To assure a dry coil, the scroll compressors  
should be de-energized while the test is being run.  
NATURAL GAS  
1. Turn off all other gas appliances connected to the gas meter.  
4. Knowing the pressure drop across a dry coil, the actual CFM  
through the unit can be determined from the curve in Figure 15.  
2. With the furnace turned on, measure the time needed for one  
revolution of the hand on the smallest dial on the meter. A  
typical gas meter usually has a 1/2 or a 1 cubic foot test dial.  
0.7  
3. Using the number of seconds for each revolution and the  
size of the test dial increment, find the cubic feet of gas  
consumed per hour from Table 18.  
072  
0.6  
0.5  
060  
048  
If the actual input is not within 5% of the furnace rating (with  
allowance being made for the permissible range of the regulator  
setting) replace the orifice spuds with spuds of the proper size.  
036  
0.4  
0.3  
0.2  
0.1  
NOTE To find the Btu input, multiply the number of cubic feet of  
gas consumed per hour by the Btu content of the gas in  
your particular locality (contact your gas company for this  
information - it varies widely from city to city.)  
TABLE 18 - GAS RATE - CUBIC FEET PER HOUR  
Seconds  
for One  
Rev.  
Size of Test Dial  
1/2 cu. ft.  
0
1 cu. ft.  
750  
1250  
1750  
2250  
2750  
3250  
3750  
10  
12  
14  
16  
18  
180  
150  
129  
113  
100  
360  
300  
257  
225  
200  
NOMINAL CFM  
FIG. 15 PRESSURE DROP vs SUPPLY AIR CFM  
20  
22  
24  
26  
28  
90  
82  
75  
69  
64  
180  
164  
150  
138  
129  
The temperature rise (or temperaturedifference between thereturn  
air and the heated air from the furnace) must lie within the range  
shown on the UL or CGA rating plate and the data in Table 2.  
30  
32  
34  
36  
38  
40  
42  
44  
46  
48  
60  
56  
53  
50  
47  
45  
43  
41  
39  
37  
120  
113  
106  
100  
95  
90  
86  
82  
78  
75  
If the CFM is above or below the specified value, the supply air  
motor speed may have to be changed by moving the motor  
speed tap to another terminal.  
Btuh Input x 0.8  
CFM =  
1.08 x oF Temp. Rise  
50  
52  
54  
56  
58  
60  
36  
35  
34  
32  
31  
30  
72  
69  
67  
64  
62  
60  
WARNING:Failure to properly adjust the total system air quan-  
tity can result in poor system performance.  
5. After readings have been obtained, remove the tubes and  
seal the holes with the 516" dot plugs removed in Step 1.  
Example: By actual measurement, it takes 38 seconds for the hand on the 1-cubic  
foot dial to make a revolution with just a 100,000 Btuh furnace running. Using this  
information, locate 38 seconds in the first column in the table above. Read across  
to the column headed “1 Cubic Foot”, where you will see that 95 cubic feet of gas  
per hour are consumed by the furnace at that rate. Multiply 95 x 1050 (the Btu  
rating of the gas obtained from the local gas company). The result is 99,750 Btuh,  
which is close to the 100,000 Btuh rating of the furnace.  
NOTE: DE-ENERGIZE THE SCROLL COMPRESSORS BE-  
FORE TAKING ANY TEST MEASUREMENTS TO  
ASSURE A DRY INDOOR COIL.  
SECURE OWNER’S APPROVAL: When the system is functioning properly, secure the owner’s approval. Show him the  
location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature  
settings within the limitations of the system.  
18  
Unitary Products Group  
530.18-N8Y  
MAINTENANCE  
The manufacture recommends that the furnace system be  
inspected once a year by a qualified service person.  
NORMAL MAINTENANCE  
CAUTION: Prior to any of the following maintenance proce-  
dures, shut off all power to the unit to prevent  
personal injury.  
CLEANING FLUE PASSAGES AND HEATING  
ELEMENTS  
Periodic maintenance normally consists of changing or cleaning  
filters and (under some conditions) cleaning the main burners.  
With proper combustion adjustment the heating element of a  
gas fired furnace will seldom need cleaning. If the element  
should become sooted, it can be cleaned as follows:  
FILTERS - Inspect once a month. Replace disposable or clean  
permanent type as necessary. DO NOT replace permanent  
type with disposable.  
1. Remove the burner assembly as outlined in “BURNER  
INSTRUCTIONS”.  
2. Remove the roof over the gas heat section.  
MOTORS - Indoor fan and outdoor fan motors are permanently  
lubricated and require no maintenance. Ventor motor is factory  
lubricated for an estimated 10 year life.  
3. At the top front of the heat section, remove the screws  
holding the top of the flue collector box. Carefully remove  
the top of the flue collector box without ripping the adjacent  
insulation.  
OUTDOOR COIL - Dirt should not be allowed to accumulate  
on the outdoor coil surface or other parts in the air circuit.  
Cleaning should be as often as necessary to keep coil clean.  
Use a brush, vacuum cleaner attachment, or other suitable  
means. If water is used to clean coil, be sure power to the unit  
is shut off prior to cleaning.  
4. Lift out the flue diverter baffle.  
5. On the inside of the flue collector box, remove the screws  
holding the flue baffle. Remove the flue baffle.  
6. Using a wire brush on a flexible wand, brush out the inside  
of each heat exchanger from the burner inlet and flue outlet  
ends.  
NOTE: Exercise care when cleaning the coil so that the coil  
fins are not damaged.  
7. Brush out the inside of the flue collector box and the flue  
baffles.  
Do not permit the outdoor air discharge to be ob-  
structed by overhanging structures of shrubs.  
8. Run the wire brush down the vent tube from the flue  
collector end.  
BURNER&PILOT-Periodically(atleastannuallyatthebeginning  
of each heating season) make a visual check of the pilot and main  
burner flame. If necessary, adjust main burner primary air shutters  
so that no yellow flame is observed as explained under “BURNER  
AIR SHUTTER ADJUSTMENT”. If it is not possible to adjust for  
the proper flame, the burners may need cleaning.  
9. If soot build-up is particularly bad, remove the vent motor  
and clean the wheel and housing. Run the wire brush down  
the flue extentions at the outlet of the vent housing.  
10. After brushing is complete, blow all brushed areas with air  
or nitrogen. Vacuum as needed.  
TO CLEAN BURNERS - Remove them from the furnace as  
explained in “Burner Instructions”. Clean burners with hot water  
applied along top of the burner.  
11. Replace parts in the order they were removed in Steps  
1 to 5.  
12. When replacing the top of the flue collector box, be careful  
so as not to tear the adjoining insulation.  
COMBUSTION AIR DISCHARGE - Visually inspect discharge  
outlet periodically to make sure that the buildup of soot and dirt  
is not excessive. If necessary, clean to maintain adequate  
combustion air discharge.  
13. Assure that all seams on the vent side of the combustion  
system are air tight. Apply a high temperature (+500°F)  
sealing compound where needed.  
TROUBLESHOOTING  
WARNING:Troubleshooting of components necessarily re-  
quires opening the electrical control box with the  
power connected to the unit. Use extreme care  
when working with live circuits! Check the unit  
nameplate for the correct line voltage and set the  
volt meter to the correct range before making any  
connections with line terminals.  
c. If “BR” is pulled in and the blower motor still does not  
run, replace the blower motor.  
d. If “BR” is not pulled in check for 24 volts at the “BR” coil.  
If 24 volts is present, replace the “BR” relay.  
e. If 24 volts is not present at the “BR” coil, check for loose  
24 volt wiring back to the relay board. Check control  
wiring to the room thermostat. If all is fine, replace the  
relay board.  
f. If the blower motor runs with the fan switch in the “ON”  
position but does not run soon after the furnace has  
ignited with the fan switch in the “AUTO” position, check  
for loose 24 volt wiring between the relay board in the  
main control box.  
CAUTION: The wire number or color and terminal designations  
referred to may vary. Check the wiring label inside the  
control box access panel for the correct wiring.  
1. Draft motor operates and furnace lights but supply air  
blower does not start after a short time delay with room  
thermostat fan switch set to “AUTO”.  
g. If all control wiring is fine, check for 24 volts at the relay  
board. If 24 volts is present, replace the relay board. If  
24 volts is not present, replace the “BT” or "ETD".  
a. Set fan switch to “ON”. If blower motor runs, go to Step  
f. If it does not, check to see if line voltage is being  
supplied to the contacts of the blower relay, “BR”, and  
if the blower relay is pulled in. Check for loose wiring.  
b. If “BR” is pulled in, touch the supply air blower motor  
housing. If it is hot the motor may be off on inherent  
protection. Disconnect power to the unit and check the  
blower motor capacitor. If it is defective, replace it with  
one of equal capacitance and voltage.  
NOTE: The furnace may shut itself down on a high tempera-  
ture condition during the procedure but this will not  
effect the test if it is done within 5 minutes of furnace  
shut-down.  
Unitary Products Group  
19  
2. The supply air blower operates but the draft motor does not  
when the room thermostat is set to call for heat and the fan  
switch in the “ON” position.  
LIST” and that the pilot adjust screw is allowing some  
flow of gas as described in “PILOT CHECKOUT”.  
b. Checkallwiringbetweentheignitorcontrolandthegasvalve.  
Check to make sure the ground connections are intact.  
a. The draft motor has inherent protection. If the motor shell  
is hot to the touch, wait for the internal overload to reset.  
b. If the motor shell is cold with the room thermostat calling  
for heat, check for line voltage at the motor’s Mate-N-  
Lok connector attached to the evaporator partition. If  
line voltage is present, replace the draft motor.  
c. If line voltage is not present, check for line voltage at  
the draft motor relay "DMR" or "DMC" contacts in the  
main control box and check to see if the “DMR” or  
"DMC" is pulled in.  
c. If the wiring is intact, check for 24 volts across terminals  
“PV” and “COMMON” on the ignitor control. If 24 volts  
is not present, replace the ignitor control.  
d. If 24 volts is present, remove the pilot burner and  
remove the pilot orifice from the pilot burner. The orifice  
is removed in the direction opposite the flow of gas.  
Inspect the orifice for obstruction. If it is clear, replace  
the main gas valve.  
5. The sparker sparks at the pilot burner but the pilot does not  
ignite and a gas odor is detected at the draft motor outlet.  
d. If the “DMR” or "DMC" relay is pulled in, check for a  
loose line voltage connection.  
a. Adjust the pilot adjust screw on the gas valve as de-  
scribed in “PILOT CHECKOUT”.  
e. If the “DMR” or "DMC" relay is not pulled in, check for  
24 volts at the “DMR” or 24 volts at the "TMC-G"  
terminal coil. If 24 volts is present, replace the “DMR”  
or "DM" relay. If 24 volts is not present, check for a loose  
24 volt connection back to the relay board and check  
the connections from the room thermostat to the relay  
board. If all connections are correct, replace the relay  
board.  
b. Check the supply pressure as described in “POST  
STARTCHECK LIST”. Makeadjustmentsasnecessary.  
c. Check the pilot orifice for obstruction as described in  
Item 4. Clean as needed but the problem should not be  
the gas valve.  
6. The pilot burner ignites but the sparker continues to spark  
and the main burners do not ignite.  
3. The draft motor runs but the furnace does not light and the  
sparker does not spark.  
a. Make the same checks and adjustment as described in Item 5.  
b. Make sure that the pilot burner is not bent or damaged.  
c. Make sure that the ground connections at the pilot  
burner, gas valve and ignitor control are intact. Check  
the high tension wire for good electrical connection. If  
all are intact, replace the ignitor module.  
a. Check all 24 volt connections from the relay board to  
and in the gas heat section. Check low voltage connec-  
tions to the “BT” and "DMC" or "ETD" located in the  
control box.  
b. If the furnace is hot, it may be out on an over tempera-  
ture condition, wait for limit reset.  
7. The pilot burner lights and the spark stops but the main  
burners do not light.  
c. With the draft motor running, check for 24 volts at  
terminal 24V on the ignitor control (IC) where the red  
lead from the draft motor attaches. If 24 volts is not  
present, the centrifugal switch (CS) has not closed or  
has gone bad. Check the line voltage to the unit, if it is  
correct replace the draft motor. If line voltage is low call  
the power company.  
a. Check electrical connections between the ignitor con-  
trol and the gas valve. If intact, check for 24 volts across  
terminals “MV” and “COMMON” terminals. If no voltage  
detected, replace ignitor control. If voltage is present,  
replace gas valve.  
d. If 24 volts is present at the ignitor control, check all  
control wiring at the ignitor control and the high tension  
wire to the ignitor. Check that the green ground wires  
from the ignitor control, the gas valve and pilot burner  
are all intact and making good electrical connection.  
Check to make sure that the ceramic insulator on the  
pilot ignitor or sensor is not broken or cracked, if all are  
intact replace the ignition control “IC”.  
8. Furnace lights with roll out or one burner has delayed ignition.  
a. Make sure that the pilot burner is aligned properly with  
the carryover as described in “PILOT CHECKOUT”.  
b. Make sure that the carryovers on adjoining burners are  
screwed fast and are level with respect to one another.  
9. Main burners light but exhibit erratic flame characteristics.  
a. Adjust air shutters as described in “BURNER AIR  
SHUTTER ADJUSTMENT”.  
b. Check the main burner orifices for obstruction and  
alignment. Removal procedure is described in  
“BURNER INSTRUCTIONS.” Clean or replace burner  
orifices and burners as needed.  
4. The draft motor runs and the sparker sparks at the pilot  
burner but the pilot does not ignite and a gas odor is not  
detected at the draft motor outlet.  
a. Check to make sure gas is being supplied to the unit.  
Make sure that the gas pressure to the unit is within the  
proper limits as described in the “POST STARTCHECK  
208/230, 575 VOLT  
MODELS ONLY  
208/230, 460 VOLT  
MODELS ONLY  
208/230-1-60 VOLT  
MODELS ONLY  
Unitary Products Group  
P.O. Box 1592, York, Pennsylvania USA 17405-1592  
Subject to change without notice. Printed in U.S.A.  
Copyright by York International Corporation 1998. All Rights Reserved.  
530.18-N8Y  

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