Service Manual | Bradford-White Corp U4TW40T*FRN instruction

TTW® Eco-Defender

Residential Ultra Low NOx Gas Water Heaters

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by qualified service providers)

Models Covered by This Manual:

U1TW40S*FRN

U1TW50S*FRN

U1TW60T*FRN

U4TW40T*FRN

U4TW50T*FRN

U4TW60T*FRN

U2TW50T*FRN

U2TW65T*FRN

UTW450S60FR*N

UTW465S60FR*N

(*) Denotes Warranty Years

(Model Shown: U-4-TW-40T6FRN)

Manual 238-48509-00A

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Bradford-White Corp U4TW40T*FRN, U4TW50T*FRN, U4TW60T*FRN service manual Service Manual

Contents

Service Manual Table of Contents Page Page Introduction Bradford White ECO-DEFENDER Safety System How the Safety System Works How to Use this Manual Tools Required Tools Required for Service Specifications Gallon Vent Tables Specifications Control Timings Wiring Diagram Sequence of Operation Power Up SequenceNormal Heating Sequence Abnormal Operation Normal Heating Sequence cont’d Abnormal Operation cont’d Sequence of Operation Sequence of Operation LED Status Control Status Probable Cause Service Procedure Troubleshooting Troubleshooting Troubleshooting Burner Cleaning Procedure Burner MaintenanceBurner Inspection Burner Cleaning Procedure cont’d Pilot Inspection, Testing and Replacement Pilot Maintenance Pilot Inspection, Testing and Replacement cont’d Page Pressure Switch Testing Pressure Switch Testing Pressure Switch Testing cont’d Pressure Switch Replacement Pressure Switch Replacement Blower Testing Blower TestingPage Blower Installation Blower ReplacementBlower Removal Blower Installation cont’d Blower Temperature Switch TestingBlower Temperature Switch Testing Switch Setting Blower Temperature Switch Testing cont’d Blower Temperature Switch Replacement Blower Temperature Switch Replacement Thermal Well Testing Thermal Well Testing Thermal Well Testing cont’d Determine Tank TemperatureDetermine Water Temperature Inside Tank Sensor Resistance at Various Temperatures Component DisassemblyGas Control & Thermal Well Removal From Water Heater Gas Control Removal Gas Control Assembly to the Thermal Well Gas Control AssemblyGas Control Removal From Thermal Well cont’d Gas Control Assembly to the Thermal Well cont’d Flammable Vapor Sensor Testing Flammable Vapor Sensor Testing VAC Circuit Trace Safety Circuit Voltage Trace Safety Circuit Voltage Trace Blower Removal Remove the Blower to Gain Access to the Flue Baffle Dip Tube Inspection and Replacement Remove the Blower to Gain Access to the Flue Baffle cont’dDip Tube Inspection Anode Inspection Anode Inspection and Replacement Inner Door Removal Inner Door Removal Procedure Inner Door Removal Procedure cont’d Inner Door Gasket ReplacementInner Door Gasket Replacement Procedure Inner Door Installation with Gasket Inner Door Installation ScreenLok Flame Arrestor Cleaning Procedure Arrestor Cleaning Common Terms Common Terms Part Name and Description Parts List Parts@bradfordwhite.com Techserv@bradfordwhite.com