Table Of Contents - A.O. Smith BTR 120-400 Service Handbook

INTRODUCTION .......................................................................................2
Qualifications ................................................................................2
Service Warning ...........................................................................2
Service Reminder .........................................................................2
Tools Recommended ...................................................................2
INSTALLATION CONSIDERATIONS.......................................................3
Instruction Manual ........................................................................3
Closed Water Systems .................................................................3
Thermal Expansion ......................................................................3
Air Requirements .........................................................................3
Contaminated Air ..........................................................................3
VENTING.................................................................................................4
Power Vent Kits For Sidewall Venting...........................................5
GAS CONTROL VALVE...........................................................................6
GAS SUPPLY SYSTEMS.........................................................................7
Supply Gas Regulator ..................................................................7
Gas Piping ....................................................................................8
FEATURES AND COMPONENTS ..........................................................10
The Eliminator (Self-Cleaning System) ........................................ 10
Automatic Flue Damper ...............................................................10
Uncrating ......................................................................................10
White Rodgers Integrated Temperature Control-High Limit Switch
......................................................................................................11
Electronic Ignition Control/ Ignition Module .................................. 12
SEQUENCE OF OPERATION FLOW CHART ........................................13
FAULT AND WARNING CODES .............................................................14
Ignition Module .............................................................................14
Flue Damper ................................................................................14
Diagnostics Codes - Ignition Module (BTR 118/119 Series)........ 15
TROUBLESHOOTING CHECKLIST .......................................................17
GENERAL SERVICE CHART .................................................................18
FAULT AND WARNING CODES - CONTINUED .....................................19
Step 1. Troubleshooting The BTR Water Heaters ........................ 19
EFFIKAL RVGP-KSF-Series Flue Damper Troubleshooting Guide
......................................................................................................21
Step 2: Test For 24Vac Between Black And Orange On Damper PC
Board ............................................................................................22
Step 3: Adjust End Switch To Cam Contact ................................. 22
Step 4: Test For 24VAC Between Black And Yellow On Damper PC
Board ............................................................................................23
Step 5: Wire Harness Test ...........................................................23
Step 6: IID Module Test (Power To The Pilot Valve) ..................... 24
Step 7: Pilot Spark Test ................................................................25
Step 8: Flame Rectification ..........................................................26
Step 9: IID Module Test ................................................................27
Step 10: Main Burner Test ............................................................28
WIRING DIAGRAM - BTR 118/119 SERIES ...........................................29
WIRING DIAGRAM - BTR 118/119 SERIES CONTROLS ......................30
NOTES ....................................................................................................31

TABLE OF CONTENTS

1