Bradford White U-TW4-75S-76R-3N - Manual (Page 2)

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Table of Contents
Section Page
Introduction ______________________________________________5
How to Use this Manual _____________________________________6
Tools Required for Service ___________________________________7
Specifications _____________________________________________8
Sequence of Operation_____________________________________ 12
Power
Up Sequence
Normal Heating Sequence
Abnormal Operation
Troubleshooting __________________________________________ 17
Burner Maintenance _______________________________________ 20
Burner
Inspection
Burner Cleaning Procedure
Pilot Maintenance _________________________________________ 22
Pilot Inspection Testing and Replacement
Pressure Switch Testing and Replacement _____________________ 25
Blower Testing and Replacement _____________________________ 28
Blower Temperature Switch Testing and Replacement ____________ 31
Thermal Well Testing ______________________________________ 34
Determine Water Temperature Inside Tank_____________________ 35
Gas Control and Thermal Well Testing and Replacement __________ 36
Flammable Vapor Sensor Testing and Replacement ______________ 40
115 VAC Circuit Trace _____________________________________ 40
Safety Circuit Voltage Trace_________________________________ 42
Flue Baffle Inspection and Replacement _______________________ 43
Diptube Inspection and Replacement _________________________ 44
Anode Inspection and Replacement ___________________________ 45
Inner Door Removal, Inspection and Replacement _______________ 46
Inner Door Gasket Replacement _____________________________ 47
Inner Door Installation_____________________________________ 48
ScreenLok ® Flame Arrestor Cleaning _________________________ 49
Common Terms __________________________________________ 50
Notes __________________________________________________ 50
Parts List _______________________________________________ 51
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