A. O. Smith Water Products Company
Service Handbook
Irving, Texas 2000
©
Training Department
1
BTH HANDBOOK
TABLE OF CONTENTS
PAGE
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
PAGE
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
Summary of Contents for BTH 120
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