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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
TABLE OF CONTENTS
Page
Introduction
Terms.................................................. 1
Tools ................................................... 2
Residential Gas Water Heaters
General Information ............................ 3
Installation........................................... 5
Operations and Servicing
Control................................................. 6
Burner ................................................. 7
Normal Operations.............................. 7
Temperature........................................ 8
Gas...................................................... 8
Water Flow.......................................... 9
Service .............................................. 10
Procedures and Conditions...............11
Multiple Heater Piping....................... 14
Exhaust Venting Notes...................... 15
Flammable Vapor Ignition Design ……15
Lint, Dust & Oil Screen……………... 16
Flame Arrestor………………………...17
Thermal Cut Off Switch………….…...18
Pilot Burner Assembly……………..….19
Sealed Combustion Chamber………..20
Piezo Igniter…………………………….21
Miscellaneous ……………………….....22
Page
Residential Electric Water Heaters
Installation………………………………23
Standard Illustrations………………….24
Guidelines………………………………25
Elements………………………………..26
Thermostat….…………………….…..27
C-2 Circuit…………………………….28
C-2 Sequence of Operation…………29
A-6 Circuit……………………………..30
A-6 Sequence of Operation…….…..31
A-7 Circuit…………………………….32
A-7 Sequence of Operation…….……33
A-7 – wiring – Post 1995………...… 34
A-7 - Sequence of Operation ……….35
Certification and Approvals….……….36
Unbalanced 3 phase……………….…37
C-2 Ohms Check……………………...38
C-2 Ohms Check…………….………..39
C2 No Hot Water……………….……..40
C-2 Grounded Element Check………41
A-6 Ohms Check – No Hot Water…..42
A-6 No Hot Water Voltage Check…..43
A-6 Lack of Hot Water Voltage Ck….44
A-6 Grounded Element Test………...45
A-7 Service……………………………46
A-7 Ohms Test……………………….47
A-7 Voltage Checks………………….48
A-7 Lack of Hot ………………………49
A-7 Grounded Element Test………50-51
Miscellaneous and Ohms Table.……52
Technical Bulletins …………….. 53-66
RESIDENTIAL GAS AND ELECTRIC SERVICE HANDBOOK INTRODUCTION
This service handbook is designed to aid in servicing and troubleshooting A.O. Smith
Residential Gas and Electric water heaters in the field. No duplication or reproduction of this book
may be made without the express written authorization of the A.O. Smith Water Products
Company.
The following text and illustrations will provide you with a step-by-step procedure to verify
proper installation, operation, and troubleshooting procedures. Additional quick reference data is
included to assist you in servicing this product.
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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