Page 1
10/09
*2P1009*
505,253M
*P505253M*
E 2006 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
G40DF(X) Series
GAS FURNACE
505,253M
10/2009
Supersedes 05/2009
Table of Contents
G40DF(X) Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . .
G40DF(X) Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . .
G40DF(X) Gas Furnace 4. . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . . . .
Safety Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use Furnace as a Construction Heater 5. . . . . . . . . . . . .
Combustion, Dilution, & Ventilation Air 6. . . . . . . . . . . . .
Downflow Installation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Equipment 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 24. . . . . . . . . . . . . . . . . . . . . . .
High Altitude Information 25. . . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments 25. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Performance 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Planned Service 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Control Board Diagnostic Codes 31. . . . . . . . . . .
Troubleshooting 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G40DF(X) Start−Up & Performance Check List 35. . . . . .
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other ap-
pliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
D Do not try to light any appliance.
D Do not touch any electrical switch; do not
use any phone in your building.
D Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
D If you cannot reach your gas supplier, call
the fire department.
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exact-
ly could result in serious injury, death,
or property damage.
WARNING
D Leave the building immediately.
Litho U.S.A.
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