Heat Controller A-13 User Manual
HEAT CONTROLLER
efrigerant
INSTALLATION INSTRUCTIONS
PACKAGE GAS ELECTRIC FEATURING
EARTH-FRIENDLY R-410A REFRIGERANT
TGC***A-13 SEER (3-5 TONS) SERIES
92-21916-38-00
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
C.R-410A Refrigerant ...........................................................................................3
1. Specifications of R-410A...............................................................................3
2. Quick Reference Guide for R-410A ..............................................................4
3. Evaporator Coil/TXV .....................................................................................4
4. Tools Required for Installing and Servicing R-410A Models.........................4
V. Safety Information..................................................................................................4
VI. Unit Dimensions.....................................................................................................5
VII. Installation..............................................................................................................7
A. General .............................................................................................................7
1. Pre-Installation Check..................................................................................7
2. Location Considerations...............................................................................7
B. Outside Installation............................................................................................8
C.Attaching Exhaust and Combustion Air Inlet Hoods .........................................9
D.Cover Panel Installation/Conversion Procedure ...............................................9
E. Clearances........................................................................................................9
F. Rooftop Installation .........................................................................................10
G.Ductwork .........................................................................................................10
H.Return Air ........................................................................................................11
VIII. Gas Supply, Condensate Drain and Piping .........................................................13
A. Gas Connection ..............................................................................................13
B. LP Conversion.................................................................................................14
C.NOx Models ....................................................................................................14
D.Adjusting or Checking Furnace Input ..............................................................15
E. Condensate Drain ...........................................................................................16
IX. Wiring...................................................................................................................16
A. Power Supply..................................................................................................16
B. Hook Up ..........................................................................................................18
C.Internal Wiring .................................................................................................18
D.Thermostat......................................................................................................18
X. Furnace Section Controls and Ignition System....................................................19
Normal Furnace Operating Sequence.................................................................19
Operating Instructions .........................................................................................20
Burners................................................................................................................21
Manual Reset Overtemperature Control..............................................................21
Pressure Switch...................................................................................................21
Limit Control ........................................................................................................21
XI. System Operating Information.............................................................................21
Advise the Customer ...........................................................................................21
Furnace Section Maintenance.............................................................................22
Lubrication...........................................................................................................23
Cooling Section Maintenance..............................................................................23
Replacement Parts..............................................................................................24
Troubleshooting...................................................................................................24
Wiring Diagrams ..................................................................................................24
Charging..............................................................................................................24
Blower Motor Speed Taps...................................................................................24
XII. General Data..................................................................................................27-31
XIII. Miscellaneous......................................................................................................32
Electrical and Physical Data................................................................................32
Airflow Performance.......................................................................................33-39
Wiring Diagrams.............................................................................................40-46
Charge Charts................................................................................................47-50
Troubleshooting..............................................................................................51-53
2
Recognize this symbol as an indi-
!
cation of Important Safety
Information!
WARNING
!
THE MANUFACTURER’S WARRANTY DOES NOT COVER ANY DAMAGE OR DEFECT TO THE AIR CONDITIONER CAUSED BY THE
ATTACHMENT OR USE OF ANY
COMPONENTS, ACCESSORIES OR
DEVICES (OTHER THAN THOSE
AUTHORIZED BY THE MANUFACTURER) INTO, ONTO OR IN CONJUNCTION WITH THE AIR CONDITIONER. YOU SHOULD BE AWARE
THAT THE USE OF UNAUTHORIZED COMPONENTS, ACCESSORIES OR DEVICES MAY
ADVERSELY AFFECT THE OPERATION OF THE AIR CONDITIONER
AND MAY ALSO ENDANGER LIFE
AND PROPERTY. THE MANUFACTURER DISCLAIMS ANY RESPONSIBILITY FOR SUCH LOSS OR
INJURY RESULTING FROM THE
USE OF SUCH UNAUTHORIZED
COMPONENTS, ACCESSORIES OR
DEVICES.
WARNING
!
INSTALL THIS UNIT ONLY IN A
LOCATION AND POSITION AS
SPECIFIED IN THE LOCATION
REQUIREMENTS AND CONSIDERATIONS SECTION OF THESE
INSTRUCTIONS. PROVIDE ADEQUATE COMBUSTION AND VENTILATION AIR TO THE UNIT SPACE
AS SPECIFIED IN THE VENTING
SECTION OF THESE INSTRUCTIONS.
WARNING
!
PROVIDE ADEQUATE COMBUSTION AND VENTILATION AIR TO
THE UNIT SPACE AS SPECIFIED IN
THE COMBUSTION AND VENTILATION AIR SECTION OF THESE
INSTRUCTIONS.
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, 3
nominal tons of cooling. Units are convertible from bottom supply and return to side supply and return by relocation of supply and return air access panels. See cover installation detail.
The units are weatherized for mounting outside of the building.
WARNING
!
UNITS ARE NOT DESIGN CERTIFIED TO BE INSTALLED INSIDE THE STRUCTURE. DOING SO CAN CAUSE INADEQUATE UNIT PERFORMANCE AS WELL
AS PROPERTY DAMAGE AND CARBON MONOXIDE POISONING RESULTING
IN PERSONAL INJURY OR DEATH.
The information on the rating plate is in compliance with the FTC and DOE rating for single 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 a product thermal efficiency rating determined
under continuous operating conditions independent of any installed system.
B. MAJOR COMPONENTS
The unit includes a hermetically-sealed refrigerating system (consisting of a scroll compressor, condenser coil, evaporator coil with thermostatic expansion valve), a circulation
air blower, a condenser fan, a heat 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 with R-410A refrigerant and performance tested. Refrigerant amount and type are indicated on rating plate.
C. R410A REFRIGERANT
All units are factory charged with R-410A refrigerant.
1
⁄2, 4, and 5
1. Specification of R-410A:
Application: R-410A is not a drop-in replacement for R-22; equipment designs must
accommodate its higher pressures. It cannot be retrofitted into R-22 units.
Pressure: The pressure of R-410A is approximately 60% (1.6 times) greater than R-
22. Recovery and recycle equipment, pumps, hoses and the like need to have design
pressure ratings appropriate for R-410A. Manifold sets need to range up to 800 psig
high-side and 250 psig low-side with a 550 psig low-side retard. Hoses need to have a
service pressure rating of 800 psig. Recovery cylinders need to have a 400 psig service
pressure rating. DOT 4BA400 or DOT BW400.
Combustibility: At pressures above 1 atmosphere, mixture of R-410A and air can
become combustible. R-410A and air should never be mixed in tanks or supply
3
lines, or be allowed to accumulate in storage tanks. Leak checking should never
be done with a mixture of R-410A and air. Leak checking can be performed safely
with nitrogen or a mixture of R-410A and nitrogen.
2. Quick Reference Guide For R-410A
• R-410A refrigerant operates at approximately 60% higher pressure (1.6 times) than R-
22. Ensure that servicing equipment is designed to operate with R-410A.
• R-410A refrigerant cylinders are pink.
• R-410A, as with other HFC’s is only compatible with POE oils.
• Vacuum pumps will not remove moisture from POE oil.
• R-410A systems are to be charged with liquid refrigerants. Prior to March 1999, R410A refrigerant cylinders had a dip tube. These cylinders should be kept upright for
equipment charging. Post March 1999 cylinders do not have a dip tube and should
be inverted to ensure liquid charging of the equipment.
• Do not install a suction line filter drier in the liquid line.
• A liquid line filter drier is standard on every unit.
• Desiccant (drying agent) must be compatible for POE oils and R-410A
3. Evaporator Coil / TXV
The thermostatic expansion valve is specifically designed to operate with R-410A. DO
NOT use an R-22 TXV. The existing evaporator must be replaced with the factory
specified TXV evaporator specifically designed for R-410A.
4. Tools Required For Installing & Servicing R-410A Models
Manifold Sets:
-Up to 800 PSIG High side
-Up to 250 PSIG Low Side
-550 PSIG Low Side Retard
Manifold Hoses:
-Service Pressure Rating of 800 PSIG
Recovery Cylinders:
-400 PSIG Pressure Rating
-Dept. of Transportation 4BA400 or BW400
!
CAUTION
R-410A systems operate at higher pressures than R-22 systems. Do not use
R-22 service equipment or components on R-410A equipment.
V. SAFETY INFORMATION
WARNING
!
USE ONLY WITH TYPE OF GAS APPROVED FOR THIS UNIT. REFER TO THE
UNIT RATING PLATE.
4
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
CONDENSATE PAN.
FIGURE 1
BOTTOM VIEW
FIGURE 2
CABINET DIMENSIONS AND ACCESS LOCATIONS
I316
I281
5
FIGURE 3
CABINET DIMENSIONS AND ACCESS LOCATIONS
FIGURE 4
SUPPLY AND RETURN DIMENSIONS
I282
I288
6
WARNING
!
NEVER TEST FOR GAS LEAKS
WITH AN OPEN FLAME. USE A
COMMERCIALLY AVAILABLE SOAP
SOLUTION MADE SPECIFICALLY
FOR THE DETECTION OF LEAKS
TO CHECK ALL CONNECTIONS, AS
SPECIFIED IN GAS SUPPLY AND
PIPING SECTION OF THESE
INSTRUCTIONS.
WARNING
!
ALWAYS INSTALL UNIT TO OPERATE 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 SECTION 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 CONTAINING THE UNIT, THE RETURN
AIR SHALL ALSO BE HANDLED BY
DUCT(S) SEALED TO THE UNIT
CASING AND TERMINATING OUTSIDE THE SPACE CONTAINING
THE UNIT.
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.
1 Batterymarch Park
Quincy, MA 02169-7471
www.nfpa.org
1. PRE-INSTALLATION CHECK-POINTS — Before attempting any installation, carefully 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. LOCATIONCONSIDERATIONS
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 petroleum 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 waterfront.
3. Shielding by a fence or shrubs may give some protection.
WARNING
!
DISCONNECT ALL POWER TO UNIT BEFORE STARTING MAINTENANCE.
FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH. REGULAR MAINTENANCE WILL REDUCE THE
BUILDUP OF CONTAMINANTS AND HELP TO PROTECT THE UNIT’S FINISH.
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 a good automobile polish will provide some protection.
3. A good liquid cleaner may be used several times a year 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 verified by the equipment manufacturer.
The best protection is frequent cleaning, maintenance and minimal exposure to
contaminants.
7
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 RATING PLATE MARKING;
• MEANS OF PROVIDING OUTDOOR AIR REQUIRED FOR COMBUSTION;
• 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 SUBSTANTIAL COMPLETION OF THE
CONSTRUCTION PROCESS, AND
VERIFY FURNACE OPERATING
CONDITIONS INCLUDING IGNITION, INPUT RATE, TEMPERATURE RISE AND VENTING,
ACCORDING TO THE INSTRUCTIONS.
FIGURE 5
OUTSIDE SLAB INSTALLATION. CLOSET DISTRIBUTION SYSTEM. SLAB FLOOR CONSTRUCTION.
B. OUTSIDE SLAB 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 PRODUCTS INTO THE CONDITIONED SPACE RESULTING IN PERSONAL INJURY
OR DEATH.
I298
(Typical outdoor slab installation is shown in Figure 5.)
1. Select a location where external water drainage cannot collect around unit.
2. Provide a level 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 area where 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 area snowfall
and to allow combustion air to enter the combustion air inlet.
7. Select an area which 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.
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 3 for 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.
Recommended
Clearance
48 A - Front
18 B - Condenser Coil
12* C - Duct Side
36 D - Evaporator End
60 E - Above
*Without Economizer. 57 With Economizer
Location
FIGURE 6
COVER GASKET DETAIL FOR UNITS SHIPPED FOR DOWNFLOW APPLICATION
BEING CONVERTED TO HORIZONTAL
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.
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 a guide when sizing and designing the duct system. Contact Air
Conditioning Contractors of America, 2800 Shirlington Road, Suite 300, Arlington, VA
22206, http://www.acca.org.
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, PROPERTY DAMAGE OR DEATH.
10
FIGURE 8
FLA T R OOFTOP IN STALLAT ION, ATTIC O R D ROP CE ILI NG DISTRI BUTING SY STEM. M OUN TED ON
ROOFCURB. CURB MUST BE LEVEL.
I299
Place the unit as close to the conditioned space as possible allowing clearances as indicated. Run ducts as directly as possible to supply and return outlets. Use of non-flammable weatherproof flexible connectors on both supply and return connections at unit to
reduce noise transmission is recommended.
On ductwork exposed to outside temperature and humidity, use a minimum of 2 of
insulation and a vapor barrier. Distribution system in attic, furred space or crawl space
should be insulated with at least 2 of insulation.
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 a negative pressure within the
vicinity of other solid, liquid, or gas fueled appliances.
1
⁄2 to 1 thick insulation is usually suffi-
H. RETURN AIR
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 CIRCULATED INTO THE LIVING SPACE CAN CREATE POTENTIALLY HAZARDOUS
CONDITIONS, INCLUDING CARBON MONOXIDE POISONING THAT COULD
RESULT IN PERSONAL INJURY OR DEATH.
11
ROOFTOP UNI
COUNTER FLA
GASKET
NAILER STRIP
DUCT*
INSULATION*
CANT STRIP*
ROOF FE
INSULATI
ROOF DE
TURAL
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
FIGURE 9
LIFTING DETAIL
B
FIGURE 10
ROOFCURB
SPREADER BAR
A
38.25
5/8 SHACKLE
(EACH CORNER)
CORNER WEIGHTS BY PERCENTAGE
A BCD
22% 27% 23% 28%
LIFTING BEAM
CABLE OR CHAIN
C.G.
25.75
C
D
I296
FIGURE 11
ROOFCURB
ROOFTOP UNIT
SUPPLY
RETURN
ST-A0801-19-01
GASKET
NAILER STRIP
DUCT*
ROOFCURB
ROOF
STRUCTURAL
MEMBER*
*BY CONTRACTOR
COUNTER FLASHING*
INSULATION*
CANT STRIP*
ROOF FELT*
INSULATION*
ROOF DECK*
ST-A0801-19-01
12
VIII. GAS SUPPLY, CONDENSATE DRAIN AND
VIII. PIPING
A. GAS CONNECTION
IMPORTANT: Connect this unit only to gas supplied by a commercial 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 specifications of the National Fuel Gas Code, ANSI Z223.1 - latest edition.
NOTE: The use of flexible gas connectors is not permitted. If local codes allow the
use of a corrugated stainless steel flexible gas appliance connector, always use a
new listed connector. Do not use a connector which has previously serviced another
gas appliance.
NOTE: The Commonwealth of Massachusetts requires the gas shut-off valve to be a
T-handle gas cock.
2. Connect the gas line to the gas pipe inlet opening provided into the 1/2 inlet valve.
See Figure 5 or 8 for typical piping.
3. Size the gas line to the furnace adequate enough to prevent undue pressure drop
and never less than 1/2 nominal pipe size.
4. Install a drip leg or sediment trap in the gas supply line as close to the unit as possible.
5. Install an outside ground joint union to connect the gas supply to the control assembly at the burner tray.
6. Gas valves have been factory installed. Install a manual gas valve where local codes
specify a shut-off valve outside the unit casing. (See Figure 13.)
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 satisfactorily meet the application should be made by a qualified installer, service
agency or the gas supplier, using factory-specified or approved parts. In the commonwealth of Massachusetts, installation must be performed by a licensed plumber
or gas fitter for appropriate fuel.
IMPORTANT: Disconnect the furnace and its individual shutoff valve from the gas supply 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 supply 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.
FIGURE 13
SUGGESTED GAS PIPING
ROOF OR GROUND LEVEL INSTALLATION
FROM GAS
METER
MANUAL GAS
SHUT-OFF
VALVE
Factory supplied grommet must be utilized.
*
UNIT GAS SUPPLY
CONNECTION
WARNING
!
CHECK FOR LEAKS. THE USE OF AN OPEN FLAME CAN RESULT IN FIRE,
EXPLOSION, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
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.
TABLE 1
NATURAL GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Nominal
Iron Pipe
*
Size,
Inches
1
⁄2 132 92 73 63 56 50 46 43
3
⁄4 278 190 152 130 115 105 96 90
1 520 350 285 245 215 195 180 170
11⁄4 1,050 730 590 500 440 400 370 350
11⁄2 1,600 1,100 890 760 670 610 560 530
10 20 30 40 50 60 70 80
Equivalent Length of Pipe, Feet
13
In making gas connections, avoid strains as they may cause noise and damage the controls. 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 pressure drop of 0.3 in. 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
Cu. Ft. Per Hr. Required =
The gas input of the furnace is marked on the furnace rating plate. The heating value of
the gas (BTU/FT
(BTU/HR)
Heating Value of Gas
3
(BTU/FT
3
) may be determined by consulting the local natural gas utility or the
)
L.P. gas supplier.
B. LP CONVERSION
WARNING
!
FACTORY FOR USE ON NATURAL GAS ONLY. CONVERSION TO LP GAS
REQUIRES A SPECIAL KIT SUPPLIED BY THE DISTRIBUTOR OR MANUFACTURER. 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, PERSONAL INJURY, PROPERTY DAMAGE OR DEATH.
Convert the valveto use liquefied petroleum(LP) gas by replacingthe pressureregulator
spring with the conversionkit spring. ThisLP kit springallows the regulator to maintain the
proper manifold pressure for LP gas. The correctburner LP orificesare includedin the kit.
SeeFigure 14.
IMPORTANT: Toremove the gas valve,remove the four screwssecuringthe manifoldpipe
to the burnertray. Removethe manifoldpipewith gas valve attached. See Figure15.
NOTE: Order the correctLP conversion kit from the furnacemanufacturer.See Conversion
Kit Index shipped with unit for proper LP kit number. Furnace conversion to LP gas
must be performed by a qualified technician.
C. NOx MODELS
Whenconverting unitsequippedwithNOx inserts to LP gas, the stainless steel screen
meshinsertsin the entrance of the tubularexchangersare not requiredto meetSCAQMD
NOxemissionlevels. Theseinserts and 1/8 diameter retainingrodshould be carefully
removed beforefiringthisfurnace on LP gas. IMPORTANT: This furnace is not designedto
operate on LP gas with the NOx inserts in place.
Stepby stepinstructions on removing the NOx insertsand retainingrod are includedin the
Conversion Kit InstallationInstructions.
TABLE 2
LP GAS PIPE CAPACITY TABLE (CU. FT./HR.)
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)
Nominal
Iron Pipe
Size, Inches
1/2
3/4
1-1/4
1-1/2
Example (LP): Input BTU requirement of unit, 150,000
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
1
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
2
Equivalent length of pipe, 60 ft. = 3/4 IPS required.
Length of Pipe, Feet
14
FIGURE 14
FIGURE 15
MANIFOLD PIPE
D. ADJUSTING OR CHECKING FURNACE INPUT
– Natural Gas LinePressure5- 10.5W.C.
– LP Gas Line Pressure 11- 1
– Natural Gas Manifold Pressure 3.5
P Gas Manifold Pressure - 10W.C
– L
Supply and manifold pressure taps are located on the gas valve body 1/8 N.P.T. and on
the manifold.
Use a properly 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 control 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 designrated 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
Cu. Ft. Per Hr. Required =
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 elevations of 2,000 - 4,500 feet (610 -1,373 meters) in Canada if 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 sea level.
(BTU/Cu. Ft.) x 3600
Time in Seconds
(for 1 Cu. Ft.) of Gas
3W.C.
W.C
.
15
TABLE 3
INPUT
BTU/HR
40,000
60,000
80,000
100,000
METER TIME IN MINUTES AND SECONDS FOR NORMAL
INPUT RATING OF FURNACES EQUIPPED FOR NATURAL
METER
SIZE
CU. FT.
MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC.
ONE 1 21 1 30 1 34 1 39 3 45
TEN 13 30 15 0 15 36 16 30 37 30
ONE 0 54 101 316230
TEN 9010 0 10 24 11 0 25 0
ONE 0 41 0 45 0 47 0 50 1 53
TEN 6 45 7 30 7 48 8 15 18 45
ONE 0 33 0 36 0 38 0 40 1 30
TEN 5 24 60615 6 36 15 0
OR LP GAS
HEATING VALUE OF GAS BTU PER CU. FT.
900 1000 1040 1100 2500
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 a condensate trap to ensure proper condensate drainage.
See Figure 16.
FIGURE 16
CONDENSATE DRAIN
DO NOT OVERTIGHTEN DRAIN FITTING
IX. WIRING
A. POWER SUPPLY
WARNING
!
TURN OFF THE MAIN ELECTRICAL POWER AT THE BRANCH CIRCUIT DISCONNECT CLOSEST TO THE UNIT BEFORE ATTEMPTING ANY WIRING. FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL
INJURY OR DEATH.
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 a branch 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 3 using the circuit ampacity found on
the unit rating plate. Use the smallest wire size allowable in Table 4 from the unit disconnect 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.
16
FIGURE 17
RECOMMENDED BRANCH CIRCUIT DISCONNECT LOCATION
BRANCH
CIRCUIT
DISCONNECT
TO THERMOSTAT
NOTES:
1. Wire size based on 60°C rated wire insulation and 30°C Ambient Temp. (86°F).
2. For more than 3 conductors in a raceway 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 AP PROVED FOR USE WITH COPPER CONDUCTORS
CONNECTED TO UNIT CONTACTOR.
ONLY
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 a length (6 or more) of recommended size copper wire to the unit contactor terminals L1 and L3 for single phase, L1, L2 and L3 for 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.
TO POWER
I317A
TABLE 4
BRANCH CIRCUIT COPPER WIRE SIZE
(Based on 1% Voltage Drop)*
200 64443322
150 86644433
100 10 8866644
50 14 12 10 10 8866
15 20 25 30 35 40 45 50
BRANCH CIRCUIT AMPACITY
SUPPLY WIRE
LENGTH-FEET
*Taken from National Electric Code
TABLE 5
AWG Copper AWG Aluminum Connector Type and Size
Wire Size Wire Size (or equivalent)
#12 #10 T & B Wire Nut PT2
#10 # 8 T & B Wire Nut PT3
# 8 # 6 Sherman Split Bolt TSP6
# 6 # 4 Sherman Split Bolt TSP4
# 4 # 2 Sherman Split Bolt TSP2
17
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