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Bradford-White Corp U4TW40TFRN, U4TW50TFRN service manual Service Manual, TTW Eco-Defender

Models: U4TW60TFRN U4TW40TFRN U4TW50T*FRN

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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 service manual Service Manual, TTW Eco-Defender, Models Covered by This Manual

Contents

Troubleshooting Guide and Instructions for Service SERVICE MANUALTo be performed ONLY by qualified service providers Denotes Warranty Years Model Shown U-4-TW-40T6FRNPage SectionTable of Contents DANGER FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED 3/4” X 3/4” TEM Introduction The Bradford White ECO-DEFENDER Safety SystemIntroduction How the Safety System Works How to Use this ManualHow to Use this Manual Tools Required for Service Tools RequiredPage SpecificationsSpecifications Vent TablesPage 40 Gallon 50 Gallon 60 GallonVent Tables SpecificationsPage 48 Gallon 65 GallonControl Timings Wiring DiagramSpecifications PageSequence of Operation Power Up SequenceNormal Heating Sequence Abnormal Operation Normal Heating Sequence cont’dSequence of Operation Sequence of Operation Abnormal Operation cont’dSequence of Operation 4. Trial for Ignition FaultAbnormal Operation cont’d Sequence of Operation 5. Flame Sensing FaultAbnormal Operation cont’d Service Procedure TroubleshootingPage LED StatusService Procedure TroubleshootingPage LED StatusService Procedure TroubleshootingPage LED StatusBurner Cleaning Procedure Burner MaintenanceBurner Inspection Burner Maintenance Burner Cleaning Procedure cont’dPilot Inspection, Testing and Replacement Pilot MaintenanceBurner Cleaning Procedure cont’d Pilot Maintenance Pilot Inspection, Testing and Replacement cont’dPage Pressure Switch Testing Pressure Switch TestingPilot Inspection, Testing and Replacement cont’d Pressure Switch Testing Pressure Switch Testing cont’dPage Pressure Switch Replacement Pressure Switch ReplacementBlower Testing Blower TestingPage Blower Installation Blower ReplacementBlower Removal Blower Installation cont’d Blower Temperature Switch TestingBlower Temperature Switch Testing Blower Temperature Switch Testing Blower Temperature Switch Testing cont’dSwitch Setting Common causes for high exhaust temperatureBlower Temperature Switch Replacement Blower Temperature Switch ReplacementThermal Well Testing Thermal Well TestingThermal 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 PagePage Gas Control RemovalGas Control Assembly to the Thermal Well Gas Control AssemblyGas Control Removal From Thermal Well cont’d Gas Control Assembly Gas Control Assembly to the Thermal Well cont’dFlammable Vapor Sensor Testing Flammable Vapor Sensor TestingGas Control Assembly to the Thermal Well cont’d Doing so will damage the connector. Use special pin typePage 115 VAC Circuit TraceSafety Circuit Voltage Trace Safety Circuit Voltage TracePage Blower Removal Remove the Blower to Gain Access to the Flue BaffleDip Tube Inspection and Replacement Remove the Blower to Gain Access to the Flue Baffle cont’dDip Tube Inspection Anode Inspection Anode Inspection and ReplacementInner Door Removal Inner Door Removal ProcedureInner Door Removal Procedure cont’d Inner Door Gasket ReplacementInner Door Gasket Replacement Procedure Inner Door Installation with Gasket Inner Door InstallationScreenLok Flame Arrestor Cleaning Procedure Arrestor CleaningCommon Terms Common TermsPage Parts ListPart Name and Description Email parts@bradfordwhite.com techserv@bradfordwhite.com