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Lennox G50UH Series User Manual

Lennox G50UH Series
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Page 3
G50UH Series
G50UH(X) Parts Arrangement
FIGURE 1
Flue Transition
Combustion Air Inducer
Combustion Air
Orifice
Combustion Air
Pressure Switch
Flue Collector Box
Heat Exchanger
Flame Sensor
Gas Valve
Burners
Ignitor
NO
x
Insert
Primary Limit
Blower Assembly
Capacitor
Door Interlock Switch
SureLight
®
Control Board
Control Transformer
Gasket
Flue Box Gasket
Flame Rollout Switches*
Flame Rollout Bracket
Gas Orifices
Ignitor Bracket
Burner Bottom Shield
Limit Shield
Secondary Limit
(NO
x
Units Only)
Air Deflector
G50UH−48C−135,
G50UH−60C−110 &
G50UH−60D−155
Units Only
*135 and 155 kBtuh units only −−
Flame rollout switches are located
on brackets on the inner sides (one
on the left and one on the right) of
the burner box.
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Lennox G50UH Series Specifications

General IconGeneral
Vent TypeNatural Draft
Heat Exchanger MaterialAluminized Steel
Efficiency80%
StagesSingle Stage
Fuel TypeNatural Gas/Propane
WarrantyLimited Lifetime Heat Exchanger Warranty, 5-Year Limited Warranty on Covered Components
Cabinet TypeUpflow/Horizontal

Summary

Safety Information

General Safety Precautions

Covers crucial warnings, dangers, and cautions for safe furnace operation and handling.

Gas Leak Detection and Response

Provides essential steps for detecting and responding to gas leaks to prevent fire or explosion.

Installation Guidelines

Combustion and Ventilation Air

Air Supply Requirements

Explains the critical need for sufficient combustion air and ventilation for efficient and safe furnace operation.

Confined Space Air Requirements

Confined Space Ventilation

Specifies air intake and ventilation requirements for furnaces installed in confined spaces.

Setting Equipment and Clearances

Return Air Configuration

Horizontal Installation Specifics

Horizontal Installation Safety

Highlights critical safety warnings related to combustion products and duct connections in horizontal installations.

Masonry Chimney Venting

Advanced Venting and Chimney Requirements

Gas Piping

Gas Piping Safety Precautions

Highlights critical safety precautions and prohibitions related to gas piping installation and materials.

Electrical and Leak Testing

Electrical Wiring and ESD Precautions

Covers safe electrical wiring practices and precautions to prevent damage from electrostatic discharge.

Gas Piping Leak Detection

Explains methods for performing leak checks on gas piping connections, including crucial safety warnings.

Wiring Diagrams

Schematic Wiring Diagram

Furnace Schematic Wiring Diagram

Offers a comprehensive schematic wiring diagram illustrating the furnace's internal electrical pathways and components.

Unit Start-Up and Gas Valve Operation

Furnace Start-Up Procedure

Guides the user through the essential steps for safely starting up the furnace for the first time.

Gas Pressure and Flow Rate

Gas Pressure Adjustment

Details procedures for checking and adjusting manifold pressure for natural gas and LP/propane.

Blower Performance Data and Troubleshooting

Troubleshooting Unit Failures

Lists common causes for furnace failure to operate and checks to perform for diagnosis.

Planned Service and Safety

Gas Leak Detection Safety

Provides a critical caution regarding the use of leak detection solutions and avoiding ignition sources.

Parts and Diagnostics

Ignition Control Diagnostic Codes

Explains diagnostic codes indicated by LED flashes for troubleshooting ignition and control board issues.

Heating Sequence Troubleshooting

Cooling Sequence Troubleshooting

Start-Up and Performance Checklist

Performance Check List Form

A comprehensive checklist for recording start-up parameters and performance checks for the installed furnace.

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