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.
