Thermal Well Testing | Bradford-White Corp U4TW40T*FRN, U4TW50T*FRN

Thermal Well Testing

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

Service Manual Table of Contents Page Page Bradford White ECO-DEFENDER Safety System Introduction How to Use this Manual How the Safety System Works Tools Required for Service Tools Required Specifications Vent Tables Gallon Specifications Wiring Diagram Control Timings Sequence of Operation Power Up SequenceNormal Heating Sequence Normal Heating Sequence cont’d Abnormal Operation Abnormal Operation cont’d Sequence of Operation Sequence of Operation Troubleshooting LED Status Control Status Probable Cause Service Procedure Troubleshooting Troubleshooting Burner Cleaning Procedure Burner MaintenanceBurner Inspection Burner Cleaning Procedure cont’d Pilot Maintenance Pilot Inspection, Testing and Replacement 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 Blower Temperature Switch Testing cont’d Switch Setting 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 Remove the Blower to Gain Access to the Flue Baffle Blower Removal Dip Tube Inspection and Replacement Remove the Blower to Gain Access to the Flue Baffle cont’dDip Tube Inspection Anode Inspection and Replacement Anode Inspection Inner Door Removal Procedure Inner Door Removal Inner Door Removal Procedure cont’d Inner Door Gasket ReplacementInner Door Gasket Replacement Procedure Inner Door Installation Inner Door Installation with Gasket Arrestor Cleaning ScreenLok Flame Arrestor Cleaning Procedure Common Terms Common Terms Parts List Part Name and Description Parts@bradfordwhite.com Techserv@bradfordwhite.com