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Lennox G1N80BU User Manual

Lennox G1N80BU
20 pages
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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 G1N80BU Specifications

General IconGeneral
BrandLennox
ModelG1N80BU
CategoryFurnace
LanguageEnglish

Summary

Safety Information

Installation Safety Rules

Lists essential safety rules and precautions for furnace installation and operation.

Massachusetts Installation Rules

Details specific installation requirements for the state of Massachusetts.

Furnace Installation

Placement and Orientation Guidelines

Covers placement, orientation, and general installation guidelines for furnace models.

Shipment and Installation Clearances

Inspecting Shipment and Filing Claims

Instructions for inspecting equipment upon receipt and filing damage claims.

Minimum Combustible Clearance Specs

Specifies minimum clearances required between the furnace and combustible materials.

Furnace Location Requirements

General and Garage Installation Advice

Provides guidance on suitable installation locations, including garages.

Combustion and Ventilation Air

Confined Space Air Supply Needs

Details air supply requirements for furnaces installed in confined spaces.

Unconfined Space Air Considerations

Explains air supply considerations for furnaces installed in unconfined spaces.

Combustion Air Quality

Contaminated Air and Outdoor Air Use

Discusses sources of contaminated air and when outdoor air is required for combustion.

Furnace Venting Installation

Vertical Venting Best Practices

Covers the requirements and best practices for vertical furnace venting.

Vent Pipe Material and Connector Specs

Specifies recommended vent pipe materials and connector requirements.

Venting System Connections

Chimney and Vent Connector Installation

Details how to connect the furnace vent to chimneys and other venting systems.

Sidewall Venting Guidelines

Sidewall Venting Limitations and Clearances

Outlines limitations and requirements for sidewall venting installations.

Existing Venting System Considerations

Replacing Old Venting Systems

Addresses considerations when replacing existing furnace venting systems.

Circulating Air Supply Management

Return Air Duct System Requirements

Specifies how return air should be handled when supply ducts extend beyond the furnace space.

Carbon Monoxide Hazard

Venting System Safety Test Procedure

Provides a detailed procedure to test the venting system for safe operation.

Sidewall Vent Terminal Clearances

Vent Terminal Clearance Specifications

Details required clearances for sidewall vent terminals based on location and codes.

Furnace Installation Configurations

Horizontal and Counterflow Installation

Covers horizontal airflow and counterflow (downflow) installation methods.

Furnace Filters and Accessories

Filter Rack, Requirements, and Kits

Information on filter rack installation, requirements, and accessory kits.

Filter Specifications

Minimum Filter Requirements and Table

Table detailing minimum filter area and quantity based on airflow.

Gas Piping Installation

Gas Supply Pressure and Piping Practices

Covers gas supply pressure, propane conversion, and safe piping practices.

Gas Connection Details

Gas Connection Diagrams and Pressure Testing

Shows gas connection diagrams and pressure testing procedures.

Electrical Wiring and Grounding

Wiring, Polarity, and Grounding Rules

Specifies electrical wiring standards, polarity, and grounding for safe operation.

Thermostat Installation

Thermostat Placement and Settings

Guides on thermostat placement and initial heat anticipator adjustment.

Furnace Operation Modes and Twinning

Blower, Humidifier, EAC, and Twinning Setup

Explains settings for blower, humidifier, EAC, and twinning furnaces.

Furnace Start-Up Procedures

Pre-Start Safety Checks and Gas Testing

Essential safety checks before starting the furnace, including gas smell test.

Furnace Ignition and Shutdown Steps

Step-by-step instructions for starting and shutting down the furnace safely.

Furnace Operation Details

Heating, Cooling, and Fan Sequences

Details the sequence of operation for heating, fan, and cooling modes.

Furnace Control Component Functions

Explains the function of key controls like pressure, limit, and interlock switches.

Blower and Gas Input Adjustments

Blower Control Board Settings and Gas Pressure

How to adjust blower speed, off-delay times, and gas manifold pressure.

Temperature Rise and Altitude Adjustments

Blower Speed for Temp Rise and Altitude

Guidance on adjusting blower speed for temperature rise and altitude considerations.

Furnace Maintenance Safety

Precautions for Servicing Equipment

Essential safety warnings and precautions before performing maintenance.

Altitude-Based Gas Pressure Charts

Manifold Pressure Settings by Altitude

Tables providing manifold pressure settings for various altitudes for different gas types.

Air Filter Maintenance

Filter Inspection and Cleaning Schedule

Recommendations for checking and maintaining air filters for optimal performance.

Burner Flame Observation

Checking Burner Flame Appearance

How to check burner flame appearance and identify potential issues.

Motor Maintenance

Motor Cleaning for Overheating Prevention

Guidance on cleaning motors to prevent overheating.

Control System Diagnostics

Initial Checks and Fault Code Access

Initial checks, system response observation, and fault code history access.

Furnace Failure Code Reference

Table detailing LED status and corresponding failure code descriptions.

Furnace Repair Parts Information

Categories of Available Replacement Parts

Lists various groups of repair parts available from the distributor.

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