Lennox G23Q4/5-100 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 G23Q4/5-100 Specifications

General

Model	G23Q4/5-100
Type	Gas Furnace
Input BTU	100, 000
Output BTU	80, 000
Efficiency	80%
Blower Type	Multi-speed
Vent Type	Natural Draft
Fuel Type	Natural Gas
Blower Motor	PSC
Stages	Single Stage
Warranty	20-Year Heat Exchanger, 5-Year Parts
Ignition Type	Hot Surface Ignition

Summary

Combustion, Dilution, & Ventilation Air

Combustion Air Requirements

Guidelines for ensuring adequate combustion air for safe and efficient furnace operation.

Installation - Setting Equipment

Venting

Venting Using a Masonry Chimney

Additional requirements for venting the furnace through a masonry chimney.

General Venting Requirements

Gas Piping

Electrical

Grounding Requirements

Details the electrical grounding procedures for the furnace.

SureLight Integrated Control Board

G23(X) Schematic Wiring Diagram

Unit Start-Up

Gas Valve Operation

Instructions on how to operate the gas valve for starting the furnace.

Gas Pressure Adjustment

Gas Flow

Method for checking and calculating gas flow rate to the combustion chamber.

Gas Pressure

Instructions for checking and adjusting gas line and manifold pressures.

High Altitude Information

Failure to Operate

Service

Blower

Filters

Cleaning Duralok™ Heat Exchanger and Burners

SureLight Troubleshooting: Heating Sequence of Operation

SureLight Troubleshooting: Cooling Sequence of Operation

SureLight Troubleshooting: Continuous Fan Sequence of Operation

G23 Start-Up & Performance Check List