Heat Controller TGC Series User manual

92-23577-78-00
INSTALLATION INSTRUCTIONS
PACKAGE GAS ELECTRIC
TGC SERIES
ARI Standard
210/240 UAC
™
HEAT CONTROLLER

2
I.TABLE OF CONTENTS
I. Table of Contents ..................................................................................................2
II. Introduction............................................................................................................3
III. Checking Product Received ..................................................................................3
IV. Specifications ........................................................................................................3
A. General .............................................................................................................3
B. Major Components............................................................................................3
V. Safety Information .................................................................................................3
VI. Unit Dimensions ....................................................................................................4
VII. Installation .............................................................................................................6
A. General .............................................................................................................6
1. Pre-Installation Check ..................................................................................6
2. Location Considerations...............................................................................6
B. Outside Installation............................................................................................7
C. Attaching Exhaust and Combustion Air Inlet Hoods .........................................8
D. Cover Panel Installation/Conversion Procedure ...............................................8
E. Clearances ........................................................................................................8
F. Rooftop Installation ...........................................................................................9
G. Ductwork ...........................................................................................................9
H. Return Air ........................................................................................................10
VIII. Gas Supply, Condensate Drain and Piping .........................................................12
A. Gas Connection ..............................................................................................12
B. LP Conversion.................................................................................................13
C. NOx Models ....................................................................................................13
D. Adjusting or Checking Furnace Input ..............................................................14
E. Condensate Drain ...........................................................................................15
IX. Wiring ..................................................................................................................15
A. Power Supply ..................................................................................................15
B. Hook Up ..........................................................................................................17
C. Internal Wiring .................................................................................................17
D. Thermostat ......................................................................................................17
X. Furnace Section Controls and Ignition System ...................................................18
Normal Furnace Operating Sequence.................................................................18
Operating Instructions .........................................................................................19
Burners ................................................................................................................20
Manual Reset Overtemperature Control..............................................................20
Pressure Switch...................................................................................................20
Limit Control ........................................................................................................20
XI. System Operating Information.............................................................................20
Furnace Section Maintenance.............................................................................21
Lubrication ...........................................................................................................22
Cooling Section Maintenance..............................................................................22
Replacement Parts ..............................................................................................23
Troubleshooting...................................................................................................23
Wiring Diagrams ..................................................................................................23
Charging ..............................................................................................................23
Blower Motor Speed Taps ...................................................................................23
XII. General Data..................................................................................................26-28
XIII. Miscellaneous......................................................................................................29
Electrical and Physical Data................................................................................29
Airflow Performance .......................................................................................30-36
Wiring Diagrams.............................................................................................37-42
Charge Charts ................................................................................................43-46
Troubleshooting..............................................................................................47-49

3
II. INTRODUCTION
This booklet contains the installation and operating instructions for your combination gas
heating/electric cooling unit. There are some precautions that should be taken to derive
maximum satisfaction from it. Improper installation can result in unsatisfactory operation
or dangerous conditions.
Read this booklet and any instructions packaged with separate equipment required to
make up the system prior to installation. Give this booklet to the owner and explain its
provisions. The owner should retain this booklet for future reference.
III. CHECKING PRODUCT RECEIVED
Upon receiving the unit, inspect it for any damage from shipment. Claims for damage,
either shipping or concealed, should be filed immediately with the shipping company.
IMPORTANT: Check the unit model number, heating size, electrical characteristics, and
accessories to determine if they are correct.
IV. SPECIFICATIONS
A. GENERAL
The Combination Gas Heating/Electric Cooling Rooftop is available in 80,000, 100,000,
120,000 and 135,000 BTU/Hr. heating inputs and cooling capacities of 3, 31⁄2, 4, and 5
nominal tons of cooling. Units are convertible from bottom supply and return to side sup-
ply and return by relocation of supply and return air access panels. See cover installa-
tion detail.
The units are weatherized for mounting outside of the building.
The information on the rating plate is in compliance with the FTC and DOE rating for sin-
gle phase units. The following information is for three phase units which are not covered
under the DOE certification program.
1. The energy consumption of the ignition system used with this unit is 9 watts.
2. The efficiency rating of this unit is aproduct thermal efficiency rating determined
under continuous operating conditions independent of any installed system.
B. MAJOR COMPONENTS
The unit includes ahermetically-sealed refrigerating system (consisting of ascroll com-
pressor, condenser coil, evaporator coil with capillary tube assembly), acirculation air
blower, acondenser fan, aheat exchanger assembly, gas burner and control assembly,
combustion air motor and fan, and all necessary internal electrical wiring. The cooling
system of these units is factory-evacuated, charged and performance tested. Refrigerant
amount and type are indicated on rating plate.
V. SAFETY INFORMATION
!WARNING
THE MANUFACTURER’S WARRAN-
TY DOES NOT COVER ANY DAM-
AGE OR DEFECT TO THE AIR CON-
DITIONER CAUSED BY THE
ATTACHMENT OR USE OF ANY
COMPONENTS, ACCESSORIES OR
DEVICES (OTHER THAN THOSE
AUTHORIZED BY THE MANUFAC-
TURER) INTO, ONTO OR IN CON-
JUNCTION WITH THE AIR CONDI-
TIONER. YOU SHOULD BE AWARE
THAT THE USE OF UNAUTHO-
RIZED COMPONENTS, ACCES-
SORIES OR DEVICES MAY
ADVERSELY AFFECT THE OPERA-
TION OF THE AIR CONDITIONER
AND MAY ALSO ENDANGER LIFE
AND PROPERTY. THE MANUFAC-
TURER DISCLAIMS ANY RESPON-
SIBILITY FOR SUCH LOSS OR
INJURY RESULTING FROM THE
USE OF SUCH UNAUTHORIZED
COMPONENTS, ACCESSORIES OR
DEVICES. !WARNING
UNITS ARE NOT DESIGN CERTIFIED TO BE INSTALLED INSIDE THE STRUC-
TURE. DOING SO CAN CAUSE INADEQUATE UNIT PERFORMANCE AS WELL
AS PROPERTY DAMAGE AND CARBON MONOXIDE POISONING RESULTING
IN PERSONAL INJURY OR DEATH.
!WARNING
USE ONLY WITH TYPE OF GAS APPROVED FOR THIS UNIT. REFER TO THE
UNIT RATING PLATE.
Recognize this symbol as an indi-
cation of Important Safety
Information!
!
!WARNING
INSTALL THIS UNIT ONLY IN A
LOCATION AND POSITION AS
SPECIFIED IN THE LOCATION
REQUIREMENTS AND CONSIDERA-
TIONS SECTION OF THESE
INSTRUCTIONS. PROVIDE ADE-
QUATE COMBUSTION AND VENTI-
LATION AIR TO THE UNIT SPACE
AS SPECIFIED IN THE VENTING
SECTION OF THESE INSTRUC-
TIONS.
!WARNING
PROVIDE ADEQUATE COMBUS-
TION AND VENTILATION AIR TO
THE UNIT SPACE AS SPECIFIED IN
THE COMBUSTION AND VENTILA-
TION AIR SECTION OF THESE
INSTRUCTIONS.
!WARNING
COMBUSTION PRODUCTS MUST
BE DISCHARGED OUTDOORS.
CONNECT THIS UNIT TO AN
APPROVED VENT SYSTEM ONLY,
AS SPECIFIED IN VENT PIPE
INSTALLATION SECTION OF
THESE INSTRUCTIONS.

4
FIGURE 1
BOTTOM VIEW
FIGURE 2
CABINET DIMENSIONS AND ACCESS LOCATIONS
VI. UNIT DIMENSIONS
FOR CLEARANCES
SEE FIGURE 7.
IMPORTANT: THIS UNIT
MUST BE MOUNTED LEVEL
IN BOTH DIRECTIONS TO
ALLOW WATER TO DRAIN
FROM THE CONDENSER
SECTION AND CONDEN-
SATE PAN.
I316
I281

5
FIGURE 3
CABINET DIMENSIONS AND ACCESS LOCATIONS
FIGURE 4
SUPPLY AND RETURN DIMENSIONS
I282
I288

6
VII.INSTALLATION
A. GENERAL
Install this unit in accordance with The American National Standard Z223.1-latest edition
booklet entitled “National Fuel Gas Code,” and the requirements or codes of the local
utility or other authority having jurisdiction.
Additional helpful publications available from the “National Fire Protection Association”
are: NFPA-90A - Installation of Air Conditioning and Ventilating Systems 1985 or latest
edition. NFPA-90B - Warm Air Heating and Air Conditioning Systems 1984.
These publications are available from:
National Fire Protection
Association, Inc.
Batterymarch Park
Quincy, MA 02269
1. PRE-INSTALLATION CHECK-POINTS— Before attempting any installation, care-
fully consider the following points:
Structural strength of supporting members
(Rooftop Installation)
Clearances and provision for servicing
Power supply and wiring
Gas supply and piping
Air duct connections and sizing
Drain facilities and connections
Location for minimum noise and
vibration - away from bedroom
windows
2. LOCATION CONSIDERATIONS
The metal parts of this unit may be subject to rust or deterioration in adverse envi-
ronmental conditions. This oxidation could shorten the equipment’s useful life. Salt
spray, fog or mist in seacoast areas, sulphur or chlorine from lawn watering systems,
and various chemical contaminants from industries such as paper mills and petrole-
um refineries are especially corrosive.
If the unit is to be installed in an area where contaminants are likely to be a
problem, give special attention to the equipment location and exposure.
1. Avoid having lawn sprinkler heads spray directly on the unit cabinet.
2. In coastal areas locate the unit on the side of the building away from the water-
front.
3.Shielding by afence or shrubs may give some protection.
1. Frequent washing of the cabinet, fan blade and coil with fresh water will remove
most of the salt or other contaminants that build up on the unit.
2. Regular cleaning and waxing of the cabinet with agood automobile polish will pro-
vide some protection.
3. A good liquid cleaner may be used several times ayear to remove matter that will
not wash off with water.
Several different types of protective coatings are offered in some areas. These coatings
may provide some benefit, but the effectiveness of such coating materials cannot be ver-
ified by the equipment manufacturer.
The best protection is frequent cleaning, maintenance and minimal exposure to
contaminants.
!WARNING
DISCONNECT ALL POWER TO UNIT BEFORE STARTING MAINTENANCE.
FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PER-
SONAL INJURY OR DEATH. REGULAR MAINTENANCE WILL REDUCE THE
BUILDUP OF CONTAMINANTS AND HELP TO PROTECT THE UNIT’S FINISH.
!WARNING
NEVER TEST FOR GAS LEAKS
WITH AN OPEN FLAME. USE A
COMMERCIALLY AVAILABLE
SOAP SOLUTION MADE SPECIFI-
CALLY FOR THE DETECTION OF
LEAKS TO CHECK ALL CONNEC-
TIONS, AS SPECIFIED IN GAS
SUPPLY AND PIPING SECTION OF
THESE INSTRUCTIONS.
!WARNING
ALWAYS INSTALL UNIT TO OPER-
ATE WITHIN THE UNIT'S INTENDED
TEMPERATURE-RISE RANGE WITH
A DUCT SYSTEM WHICH HAS AN
EXTERNAL STATIC PRESSURE
WITHIN THE ALLOWABLE RANGE,
AS SPECIFIED IN DUCTING SEC-
TION OF THESE INSTRUCTIONS.
SEE ALSO UNIT RATING PLATE.
!WARNING
WHEN A UNIT IS INSTALLED SO
THAT SUPPLY DUCTS CARRY AIR
CIRCULATED BY THE UNIT TO
AREAS OUTSIDE THE SPACE CON-
TAINING THE UNIT, THE RETURN
AIR SHALL ALSO BE HANDLED BY
DUCT(S) SEALED TO THE UNIT
CASING AND TERMINATING OUT-
SIDE THE SPACE CONTAINING
THE UNIT.

7
B. OUTSIDE SLAB INSTALLATION
(Typical outdoor slab installation is shown in Figure 5.)
1. Select alocation where external water drainage cannot collect around unit.
2. Provide alevel slab sufficiently high enough above grade to prevent surface water
from entering the unit
3. The location of the unit should be such as to provide proper access for inspection
and servicing as shown in Figure 7.
4. Locate unit where operating sounds will not disturb owner or neighbors.
5. Locate unit so roof runoff water does not pour directly on the unit. Provide gutter or
other shielding at roof level. Do not locate unit in an areawhere excessive snow
drifting may occur or accumulate.
6. Where snowfall is anticipated, the height of the unit above the ground level must be
considered. Mount unit high enough to be above anticipated maximum areasnowfall
and to allow combustion air to enter the combustion air inlet.
7. Select an areawhich will keep the areas of the vent, air intake, and A/C condenser
fins free and clear of obstructions such as weeds, shrubs, vines, snow, etc. Inform
the user accordingly.
8. Remove compressor shipping supports (if so equipped) after installation.
!WARNING
THESE UNITS ARE DESIGNED CERTIFIED FOR OUTDOOR INSTALLATION
ONLY. INSTALLATION INSIDE ANY PART OF A STRUCTURE CAN RESULT IN
INADEQUATE UNIT PERFORMANCE AS WELL AS PROPERTY DAMAGE.
INSTALLATION INSIDE CAN ALSO CAUSE RECIRCULATION OF FLUE PROD-
UCTS INTO THE CONDITIONED SPACE RESULTING IN PERSONAL INJURY
FIGURE 5
OUTSIDE SLAB INSTALLATION. CLOSET DISTRIBUTION SYSTEM. SLAB FLOOR CONSTRUCTION.
I298
!WARNING
THIS UNIT MAY BE USED TO HEAT
THE BUILDING OR STRUCTURE
DURING CONSTRUCTION IF THE
FOLLOWING INSTALLATION
REQUIREMENTS ARE MET.
INSTALLATION MUST COMPLY
WITH ALL INSTALLATION
INSTRUCTIONS INCLUDING:
• PROPER VENT INSTALLATION;
• FURNACE OPERATING UNDER
THERMOSTATIC CONTROL;
• RETURN AIR DUCT SEALED TO
THE FURNACE;
• AIR FILTERS IN PLACE;
• SET FURNACE INPUT RATE AND
TEMPERATURE RISE PER RAT-
ING PLATE MARKING;
• MEANS OF PROVIDING OUT-
DOOR AIR REQUIRED FOR COM-
BUSTION;
• RETURN AIR TEMPERATURE
MAINTAINED BETWEEN 55°F
(13°C) AND 80°F (27°C); AND
• INSTALLATION OF EXHAUST
AND COMBUSTION AIR INLET
HOODS COMPLETED;
• CLEAN FURNACE, DUCT WORK
AND COMPONENTS UPON SUB-
STANTIAL COMPLETION OF THE
CONSTRUCTION PROCESS, AND
VERIFY FURNACE OPERATING
CONDITIONS INCLUDING IGNI-
TION, INPUT RATE, TEMPERA-
TURE RISE AND VENTING,
ACCORDING TO THE INSTRUC-
TIONS.

8
C. ATTACHING EXHAUST AND COMBUSTION AIR INLET HOODS
IMPORTANT: Do not operate this unit without the exhaust/combustion air inlet hood
properly installed. This hood is shipped in a carton in the blower compartment inside
the unit and must be attached when the unit is installed. See Figure 3.
To attach exhaust/combustion air inlet hood:
1. Remove screws securing blower access panel and remove access panel. For location of
blower access panel, see Figure 2.
2. Remove exhaust/combustion air inlet hood from the carton, located inside the blower
compartment.
3. Attach blower access panel.
4. Attach the combustion air inlet/exhaust hood with screws. Reference Figure 3for proper
location. Screws are in carton with the hood.
5. Vent the unit using the flue exhaust hood, as supplied from the factory, without alteration
or addition.
D. COVER PANEL INSTALLATION/CONVERSION PROCEDURE
DOWNFLOW TO HORIZONTAL
1. Remove the screws and covers from the outside of the supply and return sections.
2. Install the covers in the bottom supply and return openings with the painted side up.
See Figure 6. Use the existing gasket to seal the covers.
3.Secure the supply cover to the base of the unit with 1 screw, engaging prepunched
tab in unit base.
4. Secure the return cover to the base of the unit with screws engaging prepunched
holes in the unit base.
This unit is provided with 2 - 25X 16X 1disposable filters. When replacing filters,
ensure they are inserted fully to the back to prevent bypass.
E. CLEARANCES
The following minimum clearances must be observed for proper unit performance and
serviceability. Reference Figure 7.
NOTE: Supply duct may be installed with “0’ inch clearance to combustible materials,
provided 1minimum Fiberglass insulation is applied either inside or on the outside of
the duct.
Recommended
Clearance Location
48A - Front
18B - Condenser Coil
12* C - Duct Side
36D - Evaporator End
60E - Above
*Without Economizer. 57 With Economizer
FIGURE 6
COVER GASKET DETAIL FOR UNITS SHIPPED FOR DOWNFLOW APPLICATION
BEING CONVERTED TO HORIZONTAL
I631

9
FIGURE 7
CLEARANCES
I297
F. ROOFTOP INSTALLATION
1. Before locating the unit on the roof, make sure that the roof structure is adequate to
support the weight involved. (See Electrical & Physical Tables in this manual.) THIS
IS VERY IMPORTANT AND THE INSTALLER’S RESPONSIBILITY.
2. For rigging and roofcurb details, see Figures 8, 9, 10 and 11.
3. The location of the unit on the roof should be such as to provide proper access for
inspection and servicing.
4. Remove compressor shipping supports (if so equipped) after installation.
IMPORTANT: If unit will not be put into service immediately, block off supply and return
air openings to prevent excessive condensation.
G. DUCTWORK
The installing contractor should fabricate ductwork in accordance with local codes. Use
industry manuals as aguide when sizing and designing the duct system. Contact Air
Conditioning Contractors of America, 151316th St. N.W., Washington, D.C. 20036.
Place the unit as close to the conditioned space as possible allowing clearances as indi-
cated. Run ducts as directly as possible to supply and return outlets. Use of non-flam-
mable weatherproof flexible connectors on both supply and return connections at unit to
reduce noise transmission is recommended.
!WARNING
DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT RETURN DUCTWORK TO
ANY OTHER HEAT PRODUCING DEVICE SUCH AS FIREPLACE INSERT,
STOVE, ETC. UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN FIRE,
CARBON MONOXIDE POISONING, EXPLOSION, PERSONAL INJURY, PROP-
ERTY DAMAGE OR DEATH.

10
On ductwork exposed to outside temperature and humidity, use aminimum of 2of
insulation and avapor barrier. Distribution system in attic, furred space or crawl space
should be insulated with at least 2of insulation. 1⁄2to 1thick insulation is usually suffi-
cient for ductwork inside the air conditioned space.
Provide balancing dampers for each branch duct in the supply system. Properly support
ductwork from the structure.
IMPORTANT: In the event that the return air ducts must be run through an “unconfined”
space containing other fuel burning equipment, it is imperative that the user/homeowner
must be informed against future changes in construction which might change this to a
“confined space.” Also, caution the user/homeowner against any future installation of
additional equipment (such as power ventilators, clothes dryers, etc., within the existing
unconfined and/or confined space which might create anegative pressure within the
vicinity of other solid, liquid, or gas fueled appliances.
H. RETURN AIR
FIGURE 8
FLAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING DISTRIBUTING SYSTEM. MOUNTED ON
ROOFCURB. CURB MUST BE LEVEL.
I299
!WARNING
NEVER ALLOW PRODUCTS OF COMBUSTION OR THE FLUE PRODUCTS TO
ENTER THE RETURN AIR DUCTWORK, OR THE CIRCULATING AIR SUPPLY.
ALL RETURN DUCTWORK MUST BE ADEQUATELY SEALED AND SECURED
TO THE FURNACE WITH SHEET METAL SCREWS, AND JOINTS TAPED. ALL
OTHER DUCT JOINTS MUST BE SECURED WITH APPROVED CONNECTIONS
AND SEALED AIRTIGHT.
FAILURE TO PREVENT PRODUCTS OF COMBUSTION FROM BEING CIRCU-
LATED INTO THE LIVING SPACE CAN CREATE POTENTIALLY HAZARDOUS
CONDITIONS, INCLUDING CARBON MONOXIDE POISONING THAT COULD
RESULT IN PERSONAL INJURY OR DEATH.

11
ROOFTOP UN
I
COUNTER FL
A
GASKET
NAILER STRIP
DUCT*
R
OOFCURB
INSULATION*
CANT STRIP*
ROOF F
E
INSULAT
I
ROOF D
E
TURAL
ER
*
FIGURE 11
ROOFCURB
FIGURE 10
ROOFCURB
RETURN DUCT*
SUPPLY DUCT*
NAILING STRIP
INSULATION PANELS
(2) SUPPLIED
GASKET
(FULL PERIMETER
AND ON DIVIDERS,
MUST BE ABOVE DUCT
AND INSULATION
PANEL FLANGES.)
HOLD
DOWN
BRACKET
TYP. (4) PLCS.
UNIT
I296
ST-A0801-19-01
CORNER WEIGHTS BY PERCENTAGE
AB C D
22% 27% 23%28%
SPREADER BAR
A
B
D
C
LIFTING BEAM
CABLE OR CHAIN
5/8SHACKLE
(EACH CORNER)
38.25
25.75
C.G.
ST-A0801-19-01
ROOFTOP UNIT
COUNTER FLASHING*
INSULATION*
CANT STRIP*
ROOF FELT*
INSULATION*
ROOF DECK*
*BY CONTRACTOR
ROOF
STRUCTURAL
MEMBER*
ROOFCURB
DUCT*
NAILER STRIP
GASKET
RETURN
SUP-
FIGURE 9
LIFTING DETAIL

12
VIII. GAS SUPPLY, CONDENSATE DRAIN AND
VIII. PIPING
A. GAS CONNECTION
IMPORTANT: Connect this unit only to gas supplied by acommercial utility.
1. Install gas piping in accordance with local codes and regulations of the local utility
company. In the absence of local codes, the installation must conform to the specifi-
cations of the National Fuel Gas Code, ANSI Z223.1 - latest edition.
NOTE: The use of flexible gas connectors is not permitted.
2. Connect the gas line to the gas pipe inlet opening provided into the 1/2inlet valve.
See Figure 5 or 8for typical piping.
3.Size the gas line to the furnace adequate enough to prevent undue pressure drop
and never less than 1/2.
4. Install adrip leg or sediment trap in the gas supply line as close to the unit as possi-
ble.
5. Install an outside ground joint union to connect the gas supply to the control assem-
bly at the burner tray.
6. Gas valves have been factory installed. Install amanual gas valve where local codes
specify ashut-off valve outside the unit casing. (See Figure 13.)
NOTE: The Commonwealth of Massachusetts requires the gas shut-off valve to be aT-
handle gas lock.
7. Make sure piping is tight. A pipe compound resistant to the action of liquefied
petroleum gases must be used at all threaded pipe connections.
8. IMPORTANT: any additions, changes or conversions required for the furnace to sat-
isfactorily meet the application should be made by aqualified installer, service
agency or the gas supplier, using factory-specified or approved parts. In the com-
monwealth of Massachusetts, installation must be performed by alicensed plumber
or gas fitter for appropriate fuel.
IMPORTANT: Disconnect the furnace and its individual shutoff valve from the gas sup-
ply piping during any pressure testing of that system at test pressures in excess of 1/2
pound per square inch gauge or isolate the system from the gas supply piping system
by closing its individual manual shutoff valve during any pressure testing of this gas sup-
ply system at pressures equal to or less than 1/2 PSIG.
TO CHECK FOR GAS LEAKS, USE A SOAP AND WATER SOLUTION OR OTHER
APPROVED METHOD. DO NOT USE AN OPEN FLAME.
IMPORTANT: Check the rating plate to make certain the appliance is equipped to burn
the type of gas supplied. Care should be taken after installation of this equipment that
the gas control valve not be subjected to high gas supply line pressure.
FIGURE 13
SUGGESTED GAS PIPING
FROM GAS
METER
*Factory supplied grommet must be utilized.
MANUAL GAS
SHUT-OFF
VALVE
UNIT GASSUPPLY
CONNECTION *
ROOF OR GROUND LEVEL INSTALLATION
!WARNING
CHECK FOR LEAKS. THE USE OF AN OPEN FLAME CAN RESULT IN FIRE,
EXPLOSION, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Nominal
Iron Pipe
Size,
Inches
Equivalent Length of Pipe, Feet
10 20 30 40 506070 80
1⁄213292736356 50 46 43
3⁄4278190 152 130 115 105 96 90
1 520 350 285 245 215 195 180 170
11⁄41,050 730 590 500 440 400 370 350
11⁄21,600 1,100 890 760 670 610 560 530
TABLE 1
GAS PIPE CAPACITY TABLE (CU. FT./HR.)

13
In making gas connections, avoid strains as they may cause noise and damage the con-
trols. A backup wrench is required to be used on the valve to avoid damage.
The capacities of gas pipe of different diameters and lengths in cu. ft. per hr. with pres-
sure drop of 0.3in. and specific gravity of 0.60 (natural gas) are shown in Table 1.
After determining the pipe length, select the pipe size which will provide the minimum
cubic feet per hour required for the gas input rating of the furnace. By formula:
Gas Input of Furnace
(BTU/HR)
Cu. Ft. Per Hr. Required = Heating Value of Gas
(BTU/FT3)
The gas input of the furnace is marked on the furnace rating plate. The heating value of
the gas (BTU/FT3) may be determined by consulting the local natural gas utility or the
L.P. gas supplier.
B. LP CONVERSION
Convert the valve to use liquefied petroleum (LP) gas by replacing the pressure regulator
spring with the conversion kit spring. This LP kit spring allows the regulator to maintain the
proper manifold pressure for LP gas. The correct burner LP orifices are included in the kit.
See Figure 14.
IMPORTANT: To remove the gas valve, remove the four screws securing the manifold pipe
to the burner tray. Remove the manifold pipe with gas valve attached. See Figure 15.
NOTE: Order the correct LP conversion kit from the furnace manufacturer.
See
Conversion Kit Index shipped with unit for proper LP kit number. Furnace conver-
sion to LP gas must be performed by a qualified technician.
C. NOx MODELS
When converting units equipped with NOx inserts to LP gas, the stainless steel screen
mesh inserts in the entrance of the tubular exchangers are not required to meet SCAQMD
NOx emission levels. These inserts and 1/8diameter retaining rod should be carefully
removed before firing this furnace on LP gas. IMPORTANT: This furnace is not designed to
operate on LP gas with the NOx inserts in place.
Step by step instructions on removing the NOx inserts and retaining rod are included in the
Conversion Kit Installation Instructions.
!WARNING
FACTORY FOR USE ON NATURAL GAS ONLY. CONVERSION TO LP GAS
REQUIRES A SPECIAL KIT SUPPLIED BY THE DISTRIBUTOR OR MANUFACTUR-
ER. MAILING ADDRESSES ARE LISTED ON THE FURNACE RATING PLATE,
PARTS LIST AND WARRANTY. FAILURE TO USE THE PROPER CONVERSION
KIT CAN CAUSE FIRE, CARBON MONOXIDE POISONING, EXPLOSION, PERSON-
AL INJURY, PROPERTY DAMAGE OR DEATH.
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum
gases (at 11 inches water column inlet pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
TABLE 2
LP GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Nominal
Iron Pipe
Size, Inches 10 20 30 40 50 60 70 80 90 100 125 150
275 189 152 129 114 103 96 89 83 78 69 63
567 393 315 267 237 217 196 182 173 162 146 132
1,071 732 590 504 448 409 378 346 322 307 275 252
2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511
3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787
6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496
1/2
3/4
1
1-1/4
1-1/2
2
Length of Pipe, Feet
Example (LP): Input BTU requirement of unit, 150,000
Equivalent length of pipe, 60 ft. = 3/4IPS required.

14
D. ADJUSTING OR CHECKING FURNACE INPUT
– Natural Gas Line Pressure 5- 10.5W.C.
– LP Gas Line Pressure 11- 13W.C.
– Natural Gas Manifold Pressure 3.5W.C
– LP Gas Manifold Pressure - 10W.C.
Supply and manifold pressure taps are located on the gas valve body 1/8N.P.T. and on
the manifold.
Use aproperly calibrated manometer gauge for accurate gas pressure readings.
Only small variations in the gas flow should be made by means of the pressure regulator
adjustment. Furnaces functioning on LP gas must be set by means of the tank or branch
supply regulators. The furnace manifold pressure should be set at 10W.C. at the gas con-
trol valve.
To adjust the pressure regulator, remove the regulator cap and turn the adjustment screw
clockwise to increase pressure or counterclockwise to decrease pressure. Then replace
the regulator cap securely.
Any necessary major changes in the gas flow rate should be made by changing the size of
the burner orifices. To change orifice spuds, shut off the manual main gas valve and
remove the gas manifold.
For elevations up to 2,000 feet, rating plate input ratings apply. For high altitudes (elevations
over 2,000 ft.), see conversion kit index 92-21519-XX for derating and orifice spud sizes.
Check of input is important to prevent over-firing of the furnace beyond its design-
rated input. NEVER SET INPUT ABOVE THAT SHOWN ON THE RATING PLATE. Use
the following table or formula to determine input rate.
Heating Value of Gas
(BTU/Cu. Ft.) x 3600
Cu. Ft. Per Hr. Required = Time in Seconds
(for 1 Cu. Ft.) of Gas
Start the furnace and measure the time required to burn one cubic foot of gas. Prior to
checking the furnace input, make certain that all other gas appliances are shut off, with
the exception of pilot burners. Time the meter with only the furnace in operation.
IMPORTANT NOTE FOR ALTITUDES ABOVE 2,000 FEET (610 METERS): The main
burner orifices in your furnace and in these kits are sized for the nameplate input and
intended for installations at elevations up to 2,000 feet in the USA or Canada, or for ele-
vations of 2,000 - 4,500 feet (610 -1,373meters) in Canadaif the unit has been derated
at the factory. For elevations above 2,000 feet (610 meters) IN THE USA ONLY (see
ANSI-Z223.1), the burner orifices must be sized to reduce the input 4% for each 1,000
feet (305 meters) above sealevel.
FIGURE 14
FIGURE 15
MANIFOLD PIPE

15
NOTICE: DERATING OF THE HEATING INPUT FOR HIGH ALTITUDE IN THE FIELD
IS UNLAWFUL IN CANADA (REFER TO CAN/CGA 2.17). UNITS INSTALLED IN
ALTITUDES GREATER THAN 2,000 FEET (610 METERS) MUST BE SHIPPED FROM
THE FACTORY OR FROM A FACTORY AUTHORIZED CONVERSION STATION
WITH THE HEATING INPUT DERATED BY 10% SO AS TO OPERATE PROPERLY IN
ALTITUDES FROM 2,000 - 4,500 FEET (610 - 1,373 METERS).
E.CONDENSATE DRAIN
The condensate drain connection of the evaporator is threaded 3/4nominal P.V.C.
pipe. IMPORTANT: Install acondensate trap to ensure proper condensate drainage.
See Figure 16.
IX. WIRING
A. POWER SUPPLY
1. All wiring should be made in accordance with the National Electrical Code.
Consult the local power company to determine the availability of sufficient power to
operate the unit. Check the voltage at power supply to make sure it corresponds to
the unit’s RATED VOLTAGE REQUIREMENT. Install abranch circuit disconnect
near the rooftop, in accordance with the N.E.C., C.E.C. or local codes. A bracket is
provided with the unit for mounting of the disconnect. See Figure 17.
2. It is important that proper electrical power is available at the unit. Voltage should not
vary more than 10% from that stamped on the unit nameplate. On three phase units,
phases must be balanced within 3%.
3. For branch circuit wiring (main power supply to unit disconnect), the minimum wire size
for the length of run can be determined from Table 3using the circuit ampacity found on
the unit rating plate. Use the smallest wire size allowable in Table 4 from the unit dis-
connect to unit.
NOTE: A bracket is provided with the unit for mounting the branch circuit disconnect to
the unit. This is the recommended location for the disconnect. See Figure 17.
4. For through the base wiring entry reference Figure 18. All fittings and conduit are field
supplied for this application. Reference the chart with Figure 18 for proper hole and
conduit size.
ONE 1 21 1 30134139345
40,000 TEN 133015 015 3616 303730
ONE 0 54 1 0 1 316230
60,000 TEN 9 0 10 0 10 24 11 0 25 0
ONE 041045047050153
80,000 TEN 6 45 7 30748815 1845
ONE 0 33 036038 040 130
100,000 TEN 5 24 6 0 6 15 6 3615 0
METER TIME IN MINUTES AND SECONDS FOR NORMAL
INPUT RATING OF FURNACES EQUIPPED FOR NATURAL
OR LP GAS
INPUT
BTU/HR
METER
SIZE
CU. FT.
HEATING VALUE OF GAS BTU PER CU. FT.
900 1000 1040 1100 2500
MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC.
TABLE 3
FIGURE 16
CONDENSATE DRAIN
DO NOT OVERTIGHTEN DRAIN FITTING
!WARNING
TURN OFF THE MAIN ELECTRICAL POWER AT THE BRANCH CIRCUIT DIS-
CONNECT CLOSEST TO THE UNIT BEFORE ATTEMPTING ANY WIRING. FAIL-
URE TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL
INJURY OR DEATH.

16
NOTES:
1. Wire size based on 60°C rated wire insulation and 30°C Ambient Temp. (86°F).
2. For more than 3conductors in araceway or cable, see the N.E.C. for derating the
ampacity of each conductor.
When installed, the unit must be electrically grounded in accordance with local
codes or, in the absence of local codes, with the National Electrical Code,
ANSI/NFPA 70, if an external electrical source is utilized.
IMPORTANT: THIS UNIT IS APPROVED FOR USE WITH COPPER CONDUCTORS
ONLY CONNECTED TO UNIT CONTACTOR.
WARRANTY MAY BE JEOPARDIZED IF ALUMINUM WIRE IS CONNECTED TO
UNIT CONTACTOR.
Special instructions apply for power wiring with aluminum conductors: Warranty
is void if connections are not made per instructions.
Attach alength (6or more) of recommended size copper wire to the unit contactor ter-
minals L1 and L3for single phase, L1, L2 and L3for three phase.
Select the equivalent aluminum wire size from the tabulation below:
Splice copper wire pigtails to aluminum wire with U.L. recognized connectors for copper-
aluminum splices. Please exercise the following instructions very carefully to obtain a
positive and lasting connection:
1. Strip insulation from aluminum conductor.
2. Coat the stripped end of the aluminum wire with the recommended inhibitor, and
wire brush the aluminum surface through inhibitor. INHIBITORS: Brundy-Pentex “A”;
Alcoa-No. 2EJC; T & B-KPOR Shield.
3. Clean and recoat aluminum conductor with inhibitor.
4. Make the splice using the above listed wire nuts or split bolt connectors.
5. Coat the entire connection with inhibitor and wrap with electrical insulating tape.
FIGURE 17
RECOMMENDED BRANCH CIRCUIT DISCONNECT LOCATION
TO POWER
TO THERMOSTAT
BRANCH
CIRCUIT
DISCONNECT
I317A
AWG Copper AWG Aluminum Connector Type and Size
Wire Size Wire Size (or equivalent)
#12 #10 T & B Wire Nut PT2
#10 # 8T & B Wire Nut PT3
#8#6 Sherman Split Bolt TSP6
#6 #4 Sherman Split Bolt TSP4
#4 #2 Sherman Split Bolt TSP2
TABLE 5
200 6 4 4 4 3322
150 86644433
100 10 8866644
50 14 12 10 10 8866
15 20 25 3035404550
BRANCH CIRCUIT AMPACITY
SUPPLY WIRE
LENGTH-FEET
*Taken from National Electric Code
TABLE 4
BRANCH CIRCUIT COPPER WIRE SIZE
(Based on 1% Voltage Drop)*

17
B. HOOK-UP
To wire unit, refer to the following hook-up diagram.
Refer to Figures 3and 18for location of wiring entrances.
Wiring to be done in the field between the unit and devices not attached to the unit, or
between separate devices which are field installed and located, shall conform with the
temperature limitation for Type T wire [63°F rise (35°C)] when installed in accordance
with the manufacturer’s instructions.
C. INTERNAL WIRING
IMPORTANT: Some single phase units are equipped with asingle pole contactor.
Caution must be exercised when servicing as only one leg of the power supply is broken
with the contactor.
Some models are equipped with electronically commutated blower motors which are
constantly energized, unless the main unit disconnect is in the off position.
A diagram of the internal wiring of this unit is located under the electrical box cover and
this manual. If any of the original wire as supplied with the appliance must be replaced,
the wire gauge and insulation must be same as original wiring.
Transformer is factory wired for 230 volts on 208/230 volt models and must be changed
for 208volt applications. See unit wiring diagram for 208volt wiring.
D. THERMOSTAT
The room thermostat must be compatible with the spark ignition control on the unit.
Generally, all thermostats that are not of the “current robbing” type are compatible with
the integrated furnace control. The low voltage wiring should be sized as shown in Table
6.
Install the room thermostat in accordance with the instruction sheet packed in the box
with the thermostat. Run the thermostat lead wires inside the blower compartment and
connect to low voltage terminals as shown on the wiring diagram. Never install the ther-
mostat on an outside wall or where it will be influenced by drafts, concealed hot or cold
water pipes or ducts, lighting fixtures, radiation from fireplace, sun rays, lamps, televi-
WIRE SIZE, AWG
FIGURE 18
FIGURE 19
TYPICAL THERMOSTAT WIRING
14
1/2
7/8
12
1/2
7/8
10
1/2
7/8
8
3/4
1-31/32
6
1
1-23/64
4
1
1-23/64
3
1-1/4
1-23/32
2
1-1/4
1-23/32
1
1-1/2
1-31/32
0
1-1/2
1-31/32
00
2
2-15/32
000
2
2-15/32
CONDUIT SIZE
HOLE SIZE
I658
NOTES: 1. DETERMINE REQUIRED WIRE SIZE FROM MINIMUM CIRCUIT AMPACITY SHOWN IN INSTALLATION & OPERATING INSTRUCTION.
2. BOTTOM POWER ENTRY WILL NOT ACCOMMODATE WIRE LARGER THAN #2 AWG (SHADED AREA).

18
sions, radios or air streams from registers. Refer to instructions packed with the thermo-
stat for “heater” selection or adjustment.
The following is alist of recommended thermostats to be used with or without an econo-
mizer:
X. FURNACE SECTION CONTROLS AND
IGNITION SYSTEM
NORMAL FURNACE OPERATING SEQUENCE
This unit is equipped with an integrated direct spark ignition control.
1. The thermostat calls for heat.
2. The control board will run aself check to verify that the limit control and manual reset
overtemperature control are closed and that the pressure switch is open.
3. Upon closure of the pressure switch, the control board energizes the induced draft
blower for a15 second prepurge.
4. After the 15 second prepurge, the gas valve opens and the spark is initiated for 7 sec-
ond trial for ignition.
5. Burners ignite and flame sensor proves all burners have lit.
6. The circulating air blower is energized after 30 seconds.
7. The control board enters anormal operation loop in which all safety controls are moni-
tored continuously.
8. Thermostat is satisfied and opens.
9. The gas valve is de-energized and closes, shutting down the burner flame.
10. The control board will de-energize the inducer after afive second post purge.
11. The circulating air blower is de-energized after 90 seconds.
The integrated control is athree ignition system.
After atotal of three cycles without sensing main burner flame, the system goes into a
100% lockout mode. After one hour, the ignition control repeats the prepurge and ignition
cycles for 3tries and then go into 100% lockout mode again. It continues this sequence of
cycles and lockout each hour until ignition is successful or power is interrupted. During the
lockout mode, neither the ignitor or gas valve will be energized until the system is reset by
turning the thermostat to the “OFF” position or interrupting the electrical power to the unit
for 3seconds or longer. The induced draft blower and main burner will shut off when the
thermostat is satisfied.
The circulating air blower will start and run on the heating speed if the thermostat fan
switch is in the “ON” position.
The integrated furnace control is equipped with diagnostic LED. The LED is lit continuously
when there is power to the control, with or without acall for heat. If the LED is not lit, there
Single Stage Cool Two Stage Cool
W/O Economizer W/Economizer
Maple Chase - Honeywell -
Model #0970 Model #T7300-A1005
Honeywell - Honeywell -
Model #T8602C Model #T874D-1959
Maple Chase -
Model #0960
White Rodgers -
Model #1F91-59
Robertshaw -
Model #CM64A-USAJ
FIELD WIRE SIZE FOR 24 VOLT THERMOSTAT CIRCUITS
SOLID COPPER WIRE - AWG.
3.0 16 14 12 10 10 10
2.5 16 14 12 12 12 10
2.0 1816 14 12 12 10
50 100 150 200 250 300
Length of Run – Feet (1)
Thermostat Load -
Amps
TABLE 6
(1) The total wire length is the distance from the furnace to the thermo-
stat and back to the furnace.
NOTE: DO NOT USE CONTROL WIRING SMALLER THAN NO. 18
AWG.

19
is either no power to the control or there is an internal component failure within the control,
and the control should be replaced.
If the control detects the following failures, the LED will flash on for approximately 1/4 sec-
ond, then off for 3/4 second for designated failure detections.
1 Flash: Failed to detect flame within the three tries for ignition.
2 Flash: Pressure switch or induced draft blower problem detected.
3Flash: High limit or auxiliary limit open.
4 Flash: Flame sensed and gas valve not energized or flame sensed with no “W” signal.
5 Flash: Overtemperature switch open.
OPERATING INSTRUCTIONS
This appliance is equipped with integrated furnace control. This device lights the main
burners each time the room thermostat (closes) calls for heat. See operating instructions
on the back of the furnace/controls access panel.
TO START THE FURNACE
1. STOP! Read the safety information on the Operating Instructions label located on this
appliance.
2. Set the thermostat to its lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance does not have apilot. It is equipped with an ignition device which auto-
matically lights the burner. Do NOT try to light the burner by hand.
5. Remove control door/access panel.
6. Move switch to the “OFF” position.
7. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor.
If you smell gas, STOP!
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your building.
• Immediately call your gas supplier from aneighbor’s phone. Follow the gas suppli-
er’s instructions.
• If you cannot reach your gas supplier, call the fire department.
If you don’t smell gas, go to the next step.
8. Move “OFF” position to “ON” position.
9. Replace the control door.
10. Turn on all electric power to the appliance.
11. Set the thermostat to the desired setting.
12. If the appliance will not operate, follow the instructions below on how to shut down the
furnace.
The initial start-up on anew installation may require the control system to be energized for
some time until air has bled through the system and fuel gas is available at the burners.
TO SHUT DOWN FURNACE
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Remove control door.
4. Move switch to the “OFF” position.
5. Replace control door.
!WARNING
DO NOT ATTEMPT TO MANUALLY LIGHT THIS FURNACE WITH A MATCH OR
ANY OPEN FLAME. ATTEMPTING TO DO SO CAN CAUSE AN EXPLOSION OR
FIRE RESULTING IN PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
!WARNING
IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLO-
SION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR
LOSS OF LIFE.
!WARNING
THE SPARK IGNITOR AND IGNITION LEAD FROM THE IGNITION CONTROL ARE
HIGH VOLTAGE. KEEP HANDS OR TOOLS AWAY TO PREVENT ELECTRICAL
SHOCK. SHUT OFF ELECTRICAL POWER BEFORE SERVICING ANY OF THE
CONTROLS. FAILURE TO ADHERE TO THIS WARNING CAN RESULT IN PER-
SONAL INJURY OR DEATH.

20
BURNERS
Burners for these units have been designed so that field adjustment is not required.
Burners are tray-mounted and accessible for easy cleaning when required.
MANUAL RESET OVERTEMPERATURE CONTROL
Two manual reset overtemperature controls (one on 80,000 BTUH) are located on the
burner shield. These devices senses blockage in the heat exchanger or insufficient com-
bustion air. This shuts off the main burners if excessive temperatures occur in the burner
compartment.
Operation of this control indicates an abnormal condition. Therefore, the unit should be
examined by aqualified installer, service agency, or the gas supplier before being placed
back into operation.
PRESSURE SWITCH
This furnace has apressure switch for sensing ablocked exhaust or afailed induced draft
blower. It is normally open and closes when the induced draft blower starts, indicating air
flow through the combustion chamber.
LIMIT CONTROL
The supply air high temperature limit cut-off is set at the factory and cannot be adjusted. It
is calibrated to prevent the air temperature leaving the furnace from exceeding the maxi-
mum outlet air temperature.
IMPORTANT: Replace this control only with the identical replacement part.
XI. SYSTEM OPERATING INFORMATION
ADVISE THE CUSTOMER
1. Change the air filters regularly. The heating system operates better, more efficiently
and more economically.
2. Arrange the furniture and drapes so that the supply air registers and the return air
grilles are unobstructed.
3. Close doors and windows. This reduces the heating and cooling load on the system.
4. Avoid excessive use of exhaust fans.
5. Do not permit the heat generated by television, lamps or radios to influence the ther-
mostat operation.
6. Except for the mounting platform, keep all combustible articles three feet from the unit
and exhaust system.
!WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF,
SHUT OFF THE MANUAL GAS VALVE TO THE APPLIANCE BEFORE SHUTTING
OFF THE ELECTRICAL SUPPLY. FAILURE TO DO SO CAN RESULT IN AN
EXPLOSION OR FIRE CAUSING PROPERTY DAMAGE, SEVERE PERSONAL
INJURY OR DEATH!
!WARNING
DO NOT JUMPER THIS DEVICE! DO NOT reset the overtemperature control with-
out taking corrective action to assure that an adequate supply of combustion air
is maintained under all conditions of operation. Failure to do so can result in
carbon monoxide poisoning or death. Replace this control only with the identi-
cal replacement part.
!WARNING
DO NOT JUMPER THIS DEVICE! DOING SO CAN CAUSE A FIRE OR EXPLOSION
RESULTING IN PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.