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Lennox CG80TB User Manual

Lennox CG80TB
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# 45464K003 Page 1
INSTALLATION INSTRUCTIONS
G1N80BU, GIN80BR, GIN80BT, CG80UB, CG80RB, & CG80TB
80% Gas-Fired Furnace
Manufactured By
A.A.C.
A Lennox International Company
421 Monroe Street
Bellevue, OH 44811
TABLE OF CONTENTS
SAFETY ................................................. 2
INSTALLATION ...................................... 2
START-UP ............................................ 14
OPERATION ........................................ 15
MAINTENANCE................................... 16
CONTROL SYSTEM DIAGNOSTICS .. 18
REPAIR PARTS ................................... 18
WIRING DIAGRAMS ............................ 19
Do not store combustible materials, including
gasoline and other flammable vapors and
liquids, near the furnace, vent pipe, or warm
air ducts. The homeowner should be cau-
tioned that the furnace area must not be
used as a broom closet or for any other
storage purposes. Such uses may result in
actions that could cause property damage,
personal injury, or death.
WARNING
This furnace is not approved for installation in
a mobile home. Do not install this furnace in a
mobile home. Installation in a mobile home
could result in actions that could cause prop-
erty damage, personal injury, or death.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause injury
or property damage. Refer to this manual. For assistance or additional information,
consult a qualified installer, service agency, or the gas supplier.
WARNING
The installation of the furnace, wiring, warm air ducts, venting, etc. must conform to the requirements of the
National Fire Protection Association; the National Fuel Gas Code, ANSI Z223.1/NFPA No. 54 (latest edition)
and the National Electrical Code, ANSI/NFPA No. 70 (latest edition) in the United States; CSA B149.1
(latest edition) Natural Gas and Propane Installation Codes and the Canadian Electrical Code Part 1, CSA
22.1 (latest edition) in Canada; and any state or provincial laws, local ordinances (including plumbing or
wastewater codes), or local gas utility requirements. Local authorities having jurisdiction should be con-
sulted before installation is made. Such applicable regulations or requirements take precedence over the
general instructions in this manual.
IMPORTANT
®
®
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Lennox CG80TB Specifications

General IconGeneral
BrandLennox
ModelCG80TB
CategoryFurnace
LanguageEnglish

Summary

Important Safety Information

Installation

Instructions for furnace installation, including model-specific configurations.

Horizontal Installations

Guidelines for installing furnaces in a horizontal orientation for specific models.

Inspection of Shipment

Clearances

Location

Unconfined Space

Confined Space

Confined Space Installation/Air from Inside Structure

Requirements for air supply in confined spaces when drawing from inside the building.

Equipment in Confined Space All Air from Outside

Methods for supplying combustion air from outside to confined furnace spaces.

Contaminated Combustion Air

Venting

Vertical Venting

Procedure for vertically venting the furnace, including code compliance.

Sidewall Venting

Guidelines for horizontal venting using listed sidewall venters.

Existing Venting Systems

Considerations when replacing an existing furnace with a new venting system.

Circulating Air Supply

Sidewall Vent Terminal Clearances

Upflow Installations

Horizontal Installations

Counterflow (Downflow) Installations

Filters

Combustible Floor Installation

Details on installing counterflow models on combustible floors using a special base assembly.

Filter Rack Installation

Steps to install filter racks for various furnace models and return air configurations.

Upflow Model Filter Location

Diagrams showing filter placement for upflow models with side or bottom return.

Gas Supply and Piping

Gas Connection

Diagrams and instructions for connecting the gas supply to the furnace.

Electrical Wiring

Thermostat

Guidance on selecting thermostat location and initial setup for furnace control.

Continuous Blower Operation

Humidifier

Electronic Air Cleaner

Twinning

START-UP

Lighting Instructions

Crucial safety warnings and steps for lighting the furnace's ignition system.

OPERATION

Sequence of Operation

Detailed explanation of the furnace's heating, cooling, and fan operation cycles.

Controls

Description of key control components like pressure, rollout, and limit switches.

Blower Control Board

Checking and Adjusting Gas Input

Temperature Rise

High Altitude

MAINTENANCE

Filters

Recommendations for checking, cleaning, or replacing air filters for optimal performance.

Main Burners

Procedure for observing and adjusting main burner flame appearance.

Lubrication

Maintenance guidelines for blower and inducer motors, focusing on periodic cleaning.

CONTROL SYSTEM DIAGNOSTICS

Troubleshooting

Steps for visual checks and system observation before diagnosing faults using LED codes.

Fault Code History Button

How to access and clear stored fault codes from the control board's memory.

REPAIR PARTS

Connection Diagram

Schematic Diagram

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