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Bradford-White Corp U4TW40TFRN, U4TW50TFRN, U4TW60T*FRN service manual Thermal Well Testing

Models: U4TW60TFRN U4TW40TFRN U4TW50T*FRN

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Thermal Well Testing

CAUTION

Do not use standard multi-meter probes for this testing. Doing so will damage the connector. Use special pin type electronic probes or small diameter wire pins inserted into connector.

Follow the procedure, below, if the water heater gas control has gone into a ECO lock- out (4 flash, 3 second pause). Reset the gas control by rotating the setpoint knob to the minimum setting for at least 6 seconds before returning to the desired water tem- perature setting.

Step 1. Unplug the thermal well connector from the gas control.

Thermal well connector

Step 2. With a multi-meter set to the ohms setting, meas- ure the resistance between the middle and right side wires.

Step 3. With a multi-meter set to the ohms setting, meas- ure the resistance between the middle and left side wires.

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Bradford-White Corp U4TW40T*FRN, U4TW50T*FRN, U4TW60T*FRN service manual Thermal Well Testing

Contents

To be performed ONLY by qualified service providers SERVICE MANUALTroubleshooting Guide and Instructions for Service 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 Tools Required for ServiceSpecifications PagePage Vent TablesSpecifications 40 Gallon 50 Gallon 60 GallonPage SpecificationsVent Tables 48 Gallon 65 GallonSpecifications Wiring DiagramControl Timings PageSequence of Operation Power Up SequenceNormal Heating Sequence Abnormal Operation Normal Heating Sequence cont’dSequence of Operation Abnormal Operation cont’d Sequence of OperationSequence of Operation 4. Trial for Ignition FaultAbnormal Operation cont’d Sequence of Operation 5. Flame Sensing FaultAbnormal Operation cont’d Page TroubleshootingService Procedure LED StatusPage TroubleshootingService Procedure LED StatusPage TroubleshootingService Procedure LED StatusBurner Cleaning Procedure Burner MaintenanceBurner Inspection Burner Cleaning Procedure cont’d Burner MaintenancePilot Inspection, Testing and Replacement Pilot MaintenanceBurner Cleaning Procedure cont’d Pilot Inspection, Testing and Replacement cont’d Pilot MaintenancePage 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 Switch Setting Blower Temperature Switch Testing cont’dBlower Temperature Switch Testing 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 Gas Control & Thermal Well Removal From Water Heater Component DisassemblySensor Resistance at Various Temperatures PageGas Control Removal PageGas 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 Gas Control AssemblyGas Control Assembly to the Thermal Well cont’d Flammable Vapor Sensor TestingFlammable Vapor Sensor Testing Doing so will damage the connector. Use special pin type115 VAC Circuit Trace PageSafety Circuit Voltage Trace Safety Circuit Voltage TracePage Remove the Blower to Gain Access to the Flue Baffle Blower RemovalDip Tube Inspection and Replacement Remove the Blower to Gain Access to the Flue Baffle cont’dDip Tube Inspection Anode Inspection and Replacement Anode InspectionInner Door Removal Procedure Inner Door RemovalInner Door Removal Procedure cont’d Inner Door Gasket ReplacementInner Door Gasket Replacement Procedure Inner Door Installation Inner Door Installation with GasketArrestor Cleaning ScreenLok Flame Arrestor Cleaning ProcedureCommon Terms Common TermsPage Parts ListPart Name and Description Email parts@bradfordwhite.com techserv@bradfordwhite.com