INSTALLATION
INSTRUCTIONS
E 2009 Lennox Industries Inc.
Dallas, Texas, USA
G61MP SERIES UNITS
GAS UNITS
506406−01
08/2009
Litho U.S.A.
Supersedes 505,124M
Table of Contents
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
G61MP Parts Identification . . . . . . . . . . . . . . . . . . . . . . 3
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . 4
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Use of Furnace as Construction Heater . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Combustion, Dilution & Ventilation Air . . . . . . . . . . . . 6
Installation − Setting Equipment . . . . . . . . . . . . . . . . . . 8
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pipe & Fittings Specifications . . . . . . . . . . . . . . . . . . . . 16
Vent Piping Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . 18
Joint Cementing Procedure . . . . . . . . . . . . . . . . . . . . . 20
Venting Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Integrated Control Board . . . . . . . . . . . . . . . . . . . . . . . 42
Unit Start−Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . 44
High Altitude Information . . . . . . . . . . . . . . . . . . . . . . . 45
Other Unit Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 46
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Ignition Control Board Diagnostic Codes . . . . . . . . . . 56
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Vent Pipe Sizing Worksheet . . . . . . . . . . . . . . . . . . . . . 63
Start−Up & Performance Check List . . . . . . . . . . . . . . 63
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exact-
ly could result in serious injury, death,
or property damage.
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
D Do not try to light any appliance.
flammable vapors and liquids in the
vicinity of this or any other ap-
pliance.
D Do not touch any electrical switch; do not
use any phone in your building.
D Leave the building immediately.
D Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
D If you cannot reach your gas supplier, call
the fire department.
08/09
506406−01
Page 1
*2P0809*
*P506406-01*
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