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ATTENTION INSTALLERS:

It is your responsibility to know this product better than your 
customer. This includes being able to install the product according 
to strict safety guidelines and instructing the customer on how to 
operate and maintain the equipment for the life of the product. 
Safety should always be the deciding factor when installing this 
product and using common sense plays an important role as well. 
Pay attention to all safety warnings and any other special notes 
highlighted in the manual. Improper installation of the furnace 
or failure to follow safety warnings could result in serious injury, 
death, or property damage. 

These instructions are primarily intended to assist qualifi ed 
individuals experienced in the proper installation of this appliance. 
Some local codes require licensed installation/service personnel 
for this type of equipment. Please read all instructions carefully 
before starting the installation. Return these instructions to the 
customer’s package for future reference.

GAS FURNACE

Installation Instructions

Upfl ow/Horizontal Model

80+ AFUE

DO NOT DESTROY THIS MANUAL

KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

FIRE OR EXPLOSION HAZARD

• Failure to follow safety warnings exactly 

could result in serious injury or property 
damage.

• Installation and service must be performed 

by a qualifi ed installer, service agency or 
the gas supplier.

• Do not store or use gasoline or other 

fl ammable vapors and liquids in the 
vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.
• Do not touch any electrical switch; do not 

use any phone in your building.

• Leave the building immediately.
• Immediately call your gas supplier from a 

neighbors phone. Follow the gas suppliers 
instructions.

• If you cannot reach your gas supplier, call 

the fi re department.

WARNING:

• PROPOSITION 65 WARNING: This product 

contains chemicals known to the state of 
California to cause cancer, birth defects or 
other reproductive harm.

•  This furnace is not approved for installation 

in mobile homes. Installing this furnace in 
a mobile home could cause fi re,  property 
damage, and/or personal injury.

WARNING:

G7XA Series - Single Stage High Effi ciency Furnace

Summary of Contents for G7XA Series

Page 1: ...uture reference GAS FURNACE Installation Instructions Upflow Horizontal Model 80 AFUE DO NOT DESTROY THIS MANUAL KEEP IN A SAFE PLACE FOR FUTURE REFERENCE FIRE OR EXPLOSION HAZARD Failure to follow sa...

Page 2: ...2...

Page 3: ...lication 12 Conversion to LP Propane 13 ELECTRICAL WIRING 13 Low Voltage Wiring 13 Line Voltage Wiring 13 Twinning 14 Grounding 15 START UP ADJUSTMENTS 15 Pre Start Checklist 15 Start Up Procedures 15...

Page 4: ...uld not be ignored WARNING indicates a potentially hazardous situation that if not avoided could result in personal injury or death CAUTION indicates a potentially hazardoussituationthatifnotavoided m...

Page 5: ...e lighting instructions Place the appliance being inspected into operation Adjust the thermostat so appliance is operating continuously 7 Test for spillage from draft hood equipped appliances at the d...

Page 6: ...trevisionoftheIFGC Consult local codes for special requirements CAUTION Exhaust fans clothes dryers fireplaces and other appliances that force air from the house to the outdoors can create a negative...

Page 7: ...ches Figure 3 Combustion Air Drawn from Outside Through Vertical Ducts Inlet Air Duct must be at least 1 sq in per 4 000 Btuh of total input rating Inlet and Outlet Ducts must extend above attic insul...

Page 8: ...s or turns All horizontal runs shall slope upwards from the furnace at inch per running foot of vent Supports for the vent pipe must be installed a minimum of every five feet along the vent run to ens...

Page 9: ...he furnace blower to provide airflow over the indoor coil the coil must be installed downstream on the outlet side of the furnace or in parallel with the furnace If a cooling system is installed in pa...

Page 10: ...he duct system See Bottom Panel Removal section Ifthefurnacewillbesuspendedfromtheceiling assemble a support frame Figure 7 using slotted iron channel and full threaded rod Fasten the frame together w...

Page 11: ...must be resistant to the actions of LP propane gas The main gas valve and main power disconnect to the furnace must be properly labeled by the installer in case emergency shutdown is required A drip...

Page 12: ...at sea level WARNING Thereductionofinputratingnecessaryforhigh altitude installation may only be accomplished with factory supplied orifices Do not attempt to drill out orifices in the field Improper...

Page 13: ...replacing any of the original wires supplied with the furnace the replacement wire must be copper wiring and have a temperature rating of at least 105 F 40 C Low Voltage Wiring The thermostat must be...

Page 14: ...45 ft 20 140 ft 70 ft 18 225 ft 110 ft Table 2 Wire Length and Voltage Specifications FURNACE W G Y C R THERMOSTAT W G Y C R W G Y R A C MOTOR TWIN TERMINAL BOARD UNIT BOARD FURNACE BOARD MOTOR TWIN T...

Page 15: ...t input rate perform these steps Grounding WARNING Tominimizepersonalinjury thefurnacecabinet musthaveanuninterruptedorunbrokenelectrical ground The controls used in this furnace require an earth grou...

Page 16: ...TWIN DHUM W1 THERMOSTAT EXPANSION PORT COOL HEAT FAN SPEED 1 2 3 4 5 6 7 8 OFF ON CONNECTION TERMINAL TO TWIN FURNACES Figure 15 Motor Control Board Verifying Burner Operation CAUTION The door over t...

Page 17: ...a call for cooling occurs during continuous fan the blower will switch over to the selected COOL speed IftheWterminalreceivesacallforheatduringcontinuous fan the blower will de energize A call for fa...

Page 18: ...iping at the furnace 8 Remove the piping between the gas valve and the ground joint union If applicable 9 Remove all screws securing the burner assembly to the furnace 10 Carefully remove the burner a...

Page 19: ...provided online Blower Limit Switch Blower switches prevent operation when blower is not operational Flame Sensor The flame sensor verifies when a flame has carried over from the igniter to the opposi...

Page 20: ...ace operates when the Blower Limit Switch is reset contact a qualified service technician to identify and repair the problem If the furnace still doesn t operate check the Flame Roll out Switches Figu...

Page 21: ...PANEL FRONT BRACE LEFT SIDE RIGHT SIDE BOTTOM VIEW FLANGES TOP VIEW ACCEPTS 4 TYPE B VENT PIPE 23 1 HOLE FOR THERMOSTAT HOLE FOR ELECTRIC HOLE FOR ELECTRIC Figure 16 Furnace Dimensions XA Model s Dim...

Page 22: ...54 795 56 765 58 730 61 1 1 1 0 1000 44 970 46 940 47 910 49 880 51 850 52 820 54 790 56 0 0 0 1 1075 41 1045 43 1015 44 985 45 960 46 925 48 900 49 870 51 1 0 0 1 1110 40 1080 41 1055 42 1025 43 1000...

Page 23: ...0 0 0 1395 57 1350 59 1305 61 1260 63 1210 66 1165 68 1 0 0 0 1465 54 1420 56 1375 58 1330 60 1290 61 1245 64 1200 66 0 1 0 0 1555 51 1510 52 1470 54 1425 56 1380 57 1340 59 1295 61 1250 63 1 1 0 0 1...

Page 24: ...AN SPEED HEAT HIGH COOL FAN HEAT MH ML LOW GREEN BLACK WHITE YELLOW YELLOW BLACK RED BLACK BLACK BLACK GREEN BLACK BLACK WHITE BLACK WHITE RED GREY WHITE BLACK WHITE NEUTRAL BLACK 208 240V GROUND For...

Page 25: ...3 346 50 72 360 720 106 34 170 340 52 69 346 692 108 33 167 333 54 67 333 667 110 33 164 327 56 64 321 643 112 32 161 321 58 62 310 621 114 32 158 316 60 60 300 600 116 31 155 310 62 58 290 581 118 31...

Page 26: ...9 0 9 0 MANIFOLD PRESSURE 8 000 to 10 000 FT 51 51 51 51 ORIFICE SIZE 8 5 8 5 8 5 8 5 MANIFOLD PRESSURE Table 9 High Altitude Deration Propane Gas PROPANE ALTITUDE ABOVE SEA LEVEL INPUT BTU 46 000 61...

Page 27: ...lve 9 Igniter 10 Inducer Assembly 11 Main Air Limit Switch 12 Motor Control Board 13 Pressure Switch 14 Transformer LOCATION OF FURNACE COMPONENTS Figure 18 Upflow Horizontal Gas Furnace R C Y G W STA...

Page 28: ...esh air supply for combustion and ventilation YES NO Installation Altitude ____________________ FT Deration Percentage ___________________ Furnace Input _______________________ Btuh Supply Air Tempera...

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