Lennox G24M4/5-120 - User Manual

Page 1

2000 Lennox Industries Inc.
Dallas, Texas
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
G24M Series
GAS FURNACE
SureLight Ignition System
504,197M
02/2000
Supersedes 503,981M
Table of Contents
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 List 32. . . . .
WHAT TO DO IF YOU SMELL GAS:
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or death.
WARNING
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.
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 suppli
er's instructions.
If you cannot reach your gas supplier, call
the fire department.
Extinguish any open flames.
Litho USA

Summary

G24 M Unit Dimensions

G24 M Gas Furnace

Requirements

Outlines installation codes and standards required by AGA, CGA, and local authorities.

Combustion, Dilution & Ventilation Air

Unconfined Space

Confined Space

Setting Equipment

Downflow Applications

Installation on Non-Combustible Flooring

Steps for installing the furnace on a non-combustible floor, including floor opening size.

Installation on Combustible Flooring

Steps for installing the furnace on a combustible floor with an additive base.

Duct System

Return Air Plenum

Guidelines for preventing negative pressure and ensuring safe operation when drawing return air from a room.

Venting

Venting Using a Masonry Chimney

Requirements for using a lined masonry chimney, including prohibitions and acceptable liner types.

General Venting Requirements

Gas Piping

Leak Check

Electrical

Unit Start-Up

Gas Valve Operation

Instructions for operating the gas valve, including safety precautions and ON/OFF procedures.

Turning Off Gas to Unit

Heating Sequence Of Operation

Gas Pressure Adjustment

Gas Pressure

Procedures for checking and adjusting gas line and manifold pressures.

High Altitude Information

Failure To Operate

Flue And Chimney

Electronic Ignition

Service

C - Filters

Guidance on inspecting, cleaning, or replacing furnace filters based on model number.

D - Flue And Chimney

Instructions to check flue pipe and chimney for tightness and blockages.

E - Burners

Ignition Control Board Diagnostic Codes

Troubleshooting

Normal Heating Mode

Normal Cooling Mode

Abnormal Heating Mode

Abnormal Cooling Mode

G24 M Start-up and Performance Check List

Lennox G24M4/5-120 Specifications

General

Brand	Lennox
Model	G24M4/5-120
Category	Furnace
Language	English