Bradford-White Corp PDX275T6*F(BN, CX) Tools Required for Service, How to Use This Manual

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PDX Series

How to Use This Manual

It is intended for this manual to be used by qualified service personal for the primary purpose of troubleshooting and repair of the Bradford White TTW Series water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting the water heater.

The Honeywell WV4460E Electronic Gas Control will display error codes in the event of abnormal operation. Error codes are listed in the troubleshooting chart beginning on page 12 of this service manual. The troubleshooting chart will also indicate the probable cause for the error code and direct the service professional to a service procedure to properly diagnose the abnormal operation.

In some difficult to diagnose conditions, it may be necessary to isolate the heater from the vent system to determine the problem.

Contact the Bradford White technical support group immediately if diagnosis can not be made using the methods described in this service manual.

Tools Required for Service

 

 

 

 

Manometer:

 

A liquid “U” tube type or a digital (magna-helic) type can be used. This

 

 

device is used to measure gas and/or air pressure and vacuum.

Multi-Meter:

A digital type is strongly recommended. This device is used to measure

 

 

electrical values. The meter you select must have the capability to

 

 

measure volts AC, volts DC, Amps, micro-amps and ohms.

Electronic Probes:

In some cases, standard multi-meter probes will damage or simply

 

 

not be effective to obtain certain voltage and ohm reading. It will be

 

 

necessary to have special electronic “pin” type multi-meter probes.

 

 

These probes are available at most electronic wholesale outlets.

Thermometer:

Used to measure water temperature. An accurate thermometer is

 

 

recommended.

Water Pressure Gage:

Used to measure water supply pressure. Also used to determine tank

 

 

pressure by adapting to the drain valve of the heater.

Gas Control Service Tool: BWC part number 239-45991-00. A specialized tool designed to remove

 

the gas control from gas control thermal well. Available from

 

your Bradford White parts supplier.

Various Hand Tools:

Pipe wrench, channel locks, open end wrenchs (3/8",7/16",½"),

 

12" crescent wrench, Allen wrench set, screw drivers (common &

Phillips), ¼" nut driver, pliers (common & needle nose), socket set, side cutters wire cutters, wire strippers, wire crimpers, torpedo level, small shop vac, step ladder, and flashlight, 5 gallon pail.

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Contents Denotes Warranty Years Service ManualTable of Contents PDX Series Introduction How to Use This Manual Tools Required for ServiceSpecifications PDX Series Control Timings Sequence of Operation Power up SequenceAbnormal Operation Pressure Switch/Blower Temperature Fault Probable Cause Service Status Procedure TroubleshootingGreen LED Indicator LED StatusTroubleshooting LED Status Air Shutter Nut Burner Inspection and Air Shutter AdjustmentCast Iron Burner Air Shutter Adjustment Burner Surface area Feedline nut Pilot tubing nut Port area Burner CleaningIgniter/flame Sense wire Pilot Inspection, Testing and ReplacementFeedline nut Pilot tubing nut Ferrule OrificeMaking voltage checks to avoid personal injury Exhaust Pressure Switch TestingVolt potential exposure. Use caution Slide pressure switch in direction Exhaust Pressure Switch ReplacementFrom blower housing To avoid personal injurySwitch for blockage Is there blockage? Inlet Pressure SwitchTo call for heat, this will start the blower SeeRemove screws Inlet Pressure Switch ReplacementVolt potential exposure. Use caution when Blower TestingBlower removal Blower InstallationRemove exhaust Blower Cord Sets Blower Mounting ScrewsBlower Temperature Switch Testing Blower Temperature Switch Replacement If Control has gone into TCO lockout due to Gas Control TestingThermal Well Testing Sensor Resistance at Various Temperatures Determine Water Temperature Inside TankGas Control Removal From Thermal Well Gas Control & Thermal Well Removal From Water HeaterGas Control Assembly to Thermal Well Flammable Vapor Device Testing Safety Circuit Voltage Trace VAC Circuit Trace Wires as shown ControlShown in photo Across black & white YDip Tube Inspection and Replacement Anode Inspection and Replacement Flue baffle Inner Door Removal Procedure Installation of Inner Door With Gasket Installation of inner door with gasket from Glossary of Terms Parts List Parts@bradfordwhite.com Techserv@bradfordwhite.com
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