¢:_2000 Lennox Industries Inc.
Dallas, Texas
INSTALLATION
INSTRUCTIONS
G24M Series
GAS FURNACE
Technicld
504,1g7MSureLight_Ignition System _.L_PuF[T_')-bli_ations
02/2000
Supersedes 503.981M LithoUSA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
i:-i:, i I
:::::::::::::_::::_:_::::::_:_:::_ _ : : , ,, ........ r -
G24M Unit Dimensions ...................... 2
G24M Parts Arrangement .................... 3
G24M Gas Furnace ......................... 3
Shipping and Packing List .................... 3
Requirements .............................. 3
General ................................... 4
Combustion, Dilution& Ventilation Air .......... 5
Setting Equipment .......................... 8
Duct System .............................. 11
Venting ................................... 12
Gas Piping ................................ 19
Electrical ................................. 21
Unit Start-up .............................. 24
Gas Pressure Adjustment ................... 25
High Altitude Information .................... 25
Other Unit Adjustments ..................... 25
Service ................................... 27
Repair Parts List ........................... 28
Ignition Control Board Diagnostic Codes ...... 28
Troubleshooting ........................... 29
G24M Start-up & Performance Check Ust ..... 32
Do not store or use gasoline or oth-
er 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.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Extinguish any open flames.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas suppli-
er's instructions.
• If you cannot reach your gas supplier, call
the fire department.
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