Lennox G23Q3/4-100 - User Manual

INSTALLATION INSTRUCTIONS
 2000 Lennox Industries Inc.
Dallas, Texas, USA

INSTALLATION
INSTRUCTIONS
G23(X) SERIES UNITS
GAS UNITS
503,884M
1/2000
Supersedes 5/99
Table of Contents
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion, Dilution, & Ventilation Air 5. . . . . . . . . .
Installation - Setting Equipment 7. . . . . . . . . . . . . . . .
Return Air Opening Guidelines 7. . . . . . . . . . . . . . . . .
Filters & Optional Filter Assembly 8. . . . . . . . . . . . . .
Duct System 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start-Up 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 22. . . . . . . . . . . . . . . . . . . .
High Altitude Information 23. . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments 23. . . . . . . . . . . . . . . . . . . . . .
Service 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SureLight Troubleshooting 27. . . . . . . . . . . . . . . . . . . .
Start-Up & Performance Check List 31. . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
flammable vapors and liquids in the vi
cinity of this or any other appliance.
Installation and service must be per
formed by a qualified installer, ser
vice agency or the gas supplier.
 Do not try to light any appliance.
 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 supplier's
instructions.
 If you cannot reach your gas supplier, call the
fire department.
 Extinguish any open flames.
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury, or death.
WARNING
Litho USA

Lennox G23Q3/4-100 Specifications

General

Model	G23Q3/4-100
Type	Gas Furnace
Efficiency Rating	80%
AFUE	80%
Fuel Type	Natural Gas
Blower Motor	Multi-speed
Heating Capacity	100, 000 BTU/h
Stages	Single Stage
Output BTU	80, 000 BTU

Summary

General Information

Combustion Air Requirements

Details the critical need for adequate combustion air and potential hazards from insufficient air.

Air Supply Methods

Installation - Setting Equipment

Return Air Opening Guidelines

Venting

Venting Using Masonry Chimney

Common Venting

Horizontal Venting

Gas Piping

Electrical

SureLight Integrated Control Board

Schematic Wiring Diagram

Unit Start-Up

Gas Valve Operation

Instructions for safely operating the gas control valve.

Gas Pressure Adjustment

Failure to Operate

Service and Maintenance

Heat Exchanger and Burner Cleaning

SureLight Troubleshooting - Heating Sequence

SureLight Troubleshooting - Heating Sequence (Contd.)

SureLight Troubleshooting - Cooling Sequence

SureLight Troubleshooting - Continuous Fan Sequence

Start-Up and Performance Checklist