Bradford-White Corp U4TW50TFRN, U4TW40TFRN, U4TW60T*FRN Blower Temperature Switch Replacement

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blower housing

Snip retaining lug from

Blower Temperature Switch Replacement

Blower Temperature Switch Replacement

WARNING

115 volt potential exposure. Use caution making voltage checks to avoid

personal injury.

Step 1. Move the gas control power switch to the “OFF” position.

Gas control power

switch

Step 2. Remove the three screws (Phillips screw driver) from the control access cover on the blower as- sembly and remove cover.

Control access

cover

Step 3. Locate blower temperature switch.

Step 4. Disconnect red and yellow wire leads from the switch.

Step 5. With an appropriate tool such as side cut- ters, snip the retaining lug from the

blower housing to allow removal of temperature switch.

Step 6. Remove switch from blower housing.

Blower temperature

switch location

Step 7. Install new switch. Be sure switch is prop- erly seated in mounting area.

Step 8. Reconnect red and yellow wires to new switch. Wires are inter- changeable with either terminal.

Step 9. Position the gas control power switch to the “ON” position and verify proper heater operation.

Step 10. Replace control access cover from step 2.

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Contents Service Manual Table of Contents Page Page Introduction Bradford White ECO-DEFENDER Safety SystemHow the Safety System Works How to Use this ManualTools Required Tools Required for ServiceSpecifications Gallon Vent TablesSpecifications Control Timings Wiring DiagramPower Up Sequence Sequence of OperationNormal Heating Sequence Abnormal Operation Normal Heating Sequence cont’dAbnormal Operation cont’d Sequence of Operation Sequence of Operation LED Status Control Status Probable Cause Service Procedure TroubleshootingTroubleshooting Troubleshooting Burner Maintenance Burner Cleaning ProcedureBurner Inspection Burner Cleaning Procedure cont’d Pilot Inspection, Testing and Replacement Pilot MaintenancePilot Inspection, Testing and Replacement cont’d Page Pressure Switch Testing Pressure Switch TestingPressure Switch Testing cont’d Pressure Switch Replacement Pressure Switch ReplacementBlower Testing Blower TestingPage Blower Replacement Blower InstallationBlower Removal Blower Temperature Switch Testing Blower Installation cont’dBlower Temperature Switch Testing Switch Setting Blower Temperature Switch Testing cont’dBlower Temperature Switch Replacement Blower Temperature Switch ReplacementThermal Well Testing Thermal Well TestingDetermine Tank Temperature Thermal Well Testing cont’dDetermine Water Temperature Inside Tank Component Disassembly Sensor Resistance at Various TemperaturesGas Control & Thermal Well Removal From Water Heater Gas Control Removal Gas Control Assembly Gas Control Assembly to the Thermal WellGas Control Removal From Thermal Well cont’d Gas Control Assembly to the Thermal Well cont’d Flammable Vapor Sensor Testing Flammable Vapor Sensor TestingVAC Circuit Trace Safety Circuit Voltage Trace Safety Circuit Voltage TraceBlower Removal Remove the Blower to Gain Access to the Flue BaffleRemove the Blower to Gain Access to the Flue Baffle cont’d Dip Tube Inspection and ReplacementDip Tube Inspection Anode Inspection Anode Inspection and ReplacementInner Door Removal Inner Door Removal ProcedureInner Door Gasket Replacement Inner Door Removal Procedure cont’dInner Door Gasket Replacement Procedure Inner Door Installation with Gasket Inner Door InstallationScreenLok Flame Arrestor Cleaning Procedure Arrestor CleaningCommon Terms Common TermsPart Name and Description Parts ListParts@bradfordwhite.com Techserv@bradfordwhite.com