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Table Of Contents - A.O. Smith Cyclone Xi Service Handbook

Commercial gas high efficiency water heaters bth 120 thru 500 models series 100 and 101
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INTRODUCTION...................................................................2
QUALIFICATIONS................................................................2
TOOLS REQUIRED..............................................................3
GENERAL INFORMATION...................................................4
GAS PRESSURE SPECIFICATIONS ..................................4
PRESSURE .........................................................................5
ADJUSTMENT PROCEDURE: ............................................5
GAS PRESSURE .................................................................5
BTH120 AND 150 MODELS.................................................5
HIGH ALTITUDE INSTALLATIONS .....................................5
BTH 120 - 150 .....................................................................5
PRESSURE .........................................................................6
ADJUSTMENT PROCEDURE:.............................................6
GAS PRESSURE .................................................................6
BTH 199 AND 250 MODELS ...............................................6
HIGH ALTITUDE INSTALLATION........................................6
PRESSURE..........................................................................7
ADJUSTMENT PROCEDURE:.............................................7
GAS PRESSURE..................................................................7
BTH 300,400,500..................................................................7
HIGH ALTITUDE ADJUSTMENT .........................................7
BTH 300,400,500..................................................................7
MATERIALS..........................................................................9
VENTING TABLES BTH 120 - 250....................................10
VENTING TABLES BTH 300,400,500...............................10
CONCENTRIC VENTING...................................................11
VENT CONDENSATION.....................................................12
USING ROOM AIR..............................................................13
USING OUTSIDE AIR.........................................................14
DIRECT VENTING - ALL MODELS...................................16
CONTROL OVERVIEW .....................................................17
POINT - DIFFERENTIAL....................................................18
CHANGING THE DISPLAY UNITS.....................................19
DIAGNOSTIC INFORMATION............................................20
FAULT CODES...................................................................22
INFORMATION ABOUT THE HEATER..............................23
CONTROL SEQUENCE FLOW CHART.............................25
A.O. Smith - Technical Training Department
CYCLONE Xi COMMERCIAL GAS WATER HEATER
BTH 120 thru 500 SERVICE HANDBOOK
Servicing should only be performed by a Qualified Service Agent

Table of Contents

CONTROLS - GAS VALVE BTH 120.................................27
CONTROLS - GAS VALVE BTH 150.................................27
ADJUSTMENT PROCEDURE:...........................................28
GAS PRESSURE ...............................................................28
BTH 199 AND 250 MODELS .............................................28
BTH300/400,.......................................................................30
250......................................................................................33
............................................................................................34
TIMING................................................................................36
PRESSURE READINGS.....................................................39
WIRING DIAGRAM - BTH 120 - 300 ................................40
WIRING DIAGRAM - BTH 400,500....................................41
1
Ashland City, Tennessee © 2009
316586-000
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