Table Of Contents - A.O. Smith BTH 120 Service And Parts Manual

Introduction. .................................. 2
Installation
Clearances.................................. 3-4
Air Requirements ........................ 5-9
Contaminated Air ........................ 10
Flammable .................................. 10
Condensation .............................. 11
Venting ........................................ 12
Sequence of Operation
Mechanical .................................. 13
Information
Multiple Unit Piping ...................... 14
Controls ...................................... 15-17
Troubleshooting
Pre-Service ................................. 18
Igniter Continuity Check ............... 18-19
Control Board Check ................... 20
Transformer ................................. 21-22
Control Board .............................. 22-23
Temperature ................................ 24
Blower ......................................... 25-26
A. O. Smith Water Products Company
©
Irving, Texas 2000
BTH HANDBOOK

TABLE OF CONTENTS

PAGE
1
Troubleshooting - continued
Pressure Switch Continuity .......... 27-28
Voltage Test - Igniter .................... 29
250 Blower Test ........................... 29
Gas Pressure Test ....................... 30
Tables
Component Part .......................... 31
Orifice Tables .............................. 31
Pressure Switches ...................... 32
Wiring Schematics
Natural and Propane Gas ............ 33
Service Aids. ................................. 34
General Questions & Answers. .... 35
Error Codes ................................... 36
Service Checklist .......................... 37
Parts Lists
966 & 967 Series ........................ 38-49
960 Series .................................. 50-53
962 Series .................................. 54-61
PAGE
Service Handbook
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