A.O. Smith 120 trough 500 - Manual (Page 2)

BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products Service Handbook
Irving, Texas ©2000 Training Department
1
BTR HANDBOOK
TABLE OF CONTENTS
PAGE PAGE
Troubleshooting (continued)
Introduction 1-2 Troubleshooting the Efflkal 30-31
Wire Harness Test 32
Installation IID Module 33
Clearances 3-4 Pilot Spark 34
Air Requirements 5-9 Pilot Valve 35-36
Contaminated Air 10 Main Burner Test 37
Flammable 10 Flame Rectification 38
Gas Pressure 11 IID Module 39
Gas Valve 12 Main Gas Valve 40-41
Venting 13-15
Wiring Schematics
Natural and Propane Gas 42
Sequence of Operation
Mechanical 16 Service Charts 43
Electrical 17-18
General Questions & Answers 44
Troubleshooting
Transformer 19 Parts List 45-50
High Limit 20-21
Damper (on Standby) 22 Component Part Information 51
PC Board 22-23
Thermostat 24 Service Check List 52-53
Damper (call for heat) 25-26
Effikal Damper 27 Comments 54
Effikal Harness Test 28
Normal Operation 28-29
BTR WORKBOOK INTRODUCTION
This service handbook is designed to aid in servicing and troubleshooting A.O. Smith BTR 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 common questions encountered in the
operation of the BTR 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 Department at 1-800-527-
1953 or your local A.O. Smith Water Products Company representative for further assistance.
This
handbook is intended for use by licensed plumbing professionals and reference should be made to the
installation manual accompanying the product. This handbook contains supplemental information to the BTR
installation and operation manual.