Table Of Contents - Lennox G43UF SERIES Unit Information

Table of Contents

Table Of Contents1
Specifications2
Optional Accessories3
Gas Heat Accessories3
Blower/Watts Data4
Performance Data4
Parts Identification8
Unit Components9
Make-Up Box9
Control Box Components9
Surelight Ignition System9
Electronic Ignition10
Fan Time Control10
Diagnostic Codes11
Ignition Control12
Heating Components13
Ignitor13
Flame Sensor14
Primary Limit Control14
Burners14
Clamshell Heat Exchanger15
Backup Secondary Limit Control15
Flame Rollout Switches15
Gas Valve15
Combustion Air Inducer And Cold End Header Box16
Combustion Air Prove Switch17
Measuring Pressure Differential17
Blower Compartment18
Blower Motor And Capacitor18
Placement And Installation19
Termination Kits19
Vent Piping Guidelines20
Maximum Vent Pipe Lengths21
Joint Cementing Procedure22
Venting Practices22
Exhaust Piping23
Intake Piping24
Cent Termination Clearances For Installations In The Usa And Canada27
Intake And Exhaust Piping Terminations For Direct Vent Installations28
Exhaust Piping Terminations For Non-Direct Vent Applications30
Condensate Piping31
Start−Up32
Preliminary And Seasonal Checks32
Heating System Service Checks33
Testing Gas Piping33
Gas Valve Operation33
Testing Gas Supply Pressure34
Check Manifold Pressure34
Gas Pipe Capacity34
Proper Gas Flow35
Proper Combustion35
Flame Signal35
Typical Operating Characteristics36
High Altitude36
Blower Operation And Adjustment36
Temperature Rise36
External Static Pressure37
Blower Speed Taps Leaded Motors37
Maintenance38
Blower Care38
Filters Care38
Winterizing And Condensate Trap Care38
Cleaning The Burner Assembly39
Wiring Diagram And Sequence Of Operation40
Heating Sequence Of Operation41
Cooling Sequence Of Operation43
Continuous Fan Sequence Of Operation44
Continuous Heat Speed Fan Sequence Of Operation49
Ignition Control Board Troubleshooting Chart50