Table Of Contents; Electrostatic Discharge (Esd) - Lennox G21Q3-40 Unit Information

General
Parts Arrangement
Specifications
Blower Data
Component Illustration
I Application
II Unit Components
Vsp1 Blower Control
VSP2 Blower Control
Ignition Control
Blower Motor Q Units
ICM1 and ICM2
III Installation
IV Maintenance
V Unit Checkout
VI Troubleshooting
VII Troubleshooting Charts Page 57−68
GC1 Ignition Control
GC3 Ignition Control
G891 Ignition Control

TABLE OF CONTENTS

Page 1
Page 3
Page 4−6
Page 6−10
Page 11
Page 12
Page 12−36
Page 15−16
Page 17−19
Page 21−24
Page 29
Page 30−36
Page 36−44
Page 45−46
Page 46−53
Page 54−56
Page 57
Page 58
Page 58

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic com
ponents. Take precautions during furnace installa
tion and service to protect the furnace's electronic
controls. Precautions will help to avoid control ex
posure to electrostatic discharge by putting the
furnace, the control and the technician at the same
electrostatic potential. Neutralize electrostatic
charge by touching hand and all tools on an un
painted unit surface, such as the gas valve or blow
er deck, before performing any service procedure.
Electrical Checkout
Gas, Air, Spark Check
Electrical Testing
ICM2−VSP2
ICM1−VSP1
Additional Charts
VIII Wiring and Sequence of Operation
G21Q
GSR21Q
G21V
Gsr21V
G21Q W/ GC3
G21Q W/ GC1
GSR21Q W/ GC3
GSR21Q W/ GC1
G21V W/ GC1
G21V W/ GC3
GSR21V W/ GC1
GSR21V W/ GC3
Jumper Summary Tables
Page 2
Page 59
Page 60
Page 61
Page 62
Page 63−65
Page 66−68
Page 69−70
Page 71−72
Page 73−74
Page 75−76
Page 77−78
Page 79−80
Page 81−82
Page 83−84
Page 85−86
Page 87−88
Page 89−90
Page 91−92
Page 93−99