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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
A.O. Smith Water Products Company Training Department
©2002 Ashland City, Tennessee
1
TABLE OF CONTENTS
Page
Introduction
Terms......................................................... 1
Tools .......................................................... 2
Residential Gas Water Heaters
Guidelines.................................................. 3
Installation.................................................. 5
Operations and Servicing
Construction............................................... 6
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
Residential Electric Water Heaters
Installation................................................ 16
Standard Illustrations............................... 17
Guidelines................................................ 18
Elements.................................................. 19
Thermostat............................................... 20
Page
Residential Electric continued
C-2 Circuit..........................................21
C-2 Sequence of Operation...............22
A-6 Circuit..........................................23
A-6 Wiring Diagram ...........................24
A-7 .....................................................25
A-7 Wiring Diagram ...........................27
Certification and Approvals................29
Simultaneous Dual Elements ............30
C-2 Service........................................31
C-2 Voltage Checks...........................32
C-2 Grounded Element Check ..........34
A-6 Service ........................................35
A-6 Element Test...............................35
A-6 Voltage Check.............................36
A-6 Grounded Element Test..............38
A-7 Service ........................................39
A-7 Element Test...............................40
A-7 Voltage Checks...........................41
A-7 Grounded Element Test..............44
Miscellaneous Information.................45
A.O. Smith Technical Bulletins
46
RESIDENTIAL GAS AND ELECTRIC 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.
The information contained in this handbook is designed to answer commonly faced
situations encountered in the operation of the Residential Gas and Electric product line and is not
meant to be all-inclusive. If you are experiencing a problem not covered in this handbook, please
contact the A.O. Smith Technical Information Center at 1-800-527-1953 or your local A.O. Smith
Water Products Company representative for further assistance. Additional information is also
available on the web site www.hotwater.com
. This handbook is intended for use by licensed
plumbing professionals and reference should be made to the instructional manual accompanying
the product. This handbook contains supplemental information to the Residential Gas and
Electric instructional manual.