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,1_2006 Lennox industries Inc.
Dallas, Texas, USA
INSTALLATION
INSTRUCTIONS
G50UH(X) Series
GAS FURNACE
505,254M _ Technical
8/2006 .L_._LPublications
Supersedes 504,957M
Lithe U.S.A.
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Unit Dimensions ................................ 2
G50UH(X) Parts Arrangement .................... 3
G50UH(X) Gas Furnace .......................... 4
Shipping and Packing List ........................ 4
Safety Information ............................... 4
General ........................................ 5
Combustion, Dilution & Ventilation Air .............. 6
Setting Equipment ............................... 8
Filters .......................................... 12
Duct System .................................... 12
Venting ........................................ 12
Gas Piping ..................................... 20
Electrical ....................................... 21
Unit Start-Up ................................... 25
Gas Pressure Adjustment ........................ 26
High Altitude Information ......................... 27
Other Unit Adjustments .......................... 27
Service ........................................ 28
Repair Parts List ................................ 30
Ignition Control Board Diagnostic Codes ........... 30
Troubleshooting ................................. 31
Start-Up & Performance Check List ................ 35
&WARNING
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.
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
neighbor's phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
08/06
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505,254M
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