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Bradford White
PDX Series
Powered Direct Vent Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by qualified service providers)
For Bradford White
PDX Series Models:
PDX250T6*F(BN,CX)
PDX265T6*F(BN,CX)
PDX275T6*F(BN,CX)
PDX50S60F(B,C)*(N,X)
PDX65S65F(B,C)*(N,X)
PDX75S70F(B,C)*(N,X)
(*) Denotes Warranty Years
Manual 46925A
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Table of Contents
Related Manuals for Bradford White PDX250T6*FBN
Summary of Contents for Bradford White PDX250T6*FBN
- Page 1 Bradford White PDX Series Powered Direct Vent Gas Water Heaters SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) For Bradford White PDX Series Models: PDX250T6*F(BN,CX) PDX265T6*F(BN,CX) PDX275T6*F(BN,CX) PDX50S60F(B,C)*(N,X) PDX65S65F(B,C)*(N,X) PDX75S70F(B,C)*(N,X) (*) Denotes Warranty Years...
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Page 2: Table Of Contents
Bradford White PDX Series Powered Direct Vent Gas Water Heaters Table of Contents Page TTW Service Procedure Introduction - - - How to use this manual - - - Tool required for service - - - Specifications - - -... - Page 3 PDX Series CAUTION WARNING: If the information in these Incorrect operation of this instructions is not followed exactly, a fire or appliance may create a hazard to explosion may result causing property damage, life and property and will nullify the personal injury, or death.
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Page 4: Introduction
PDX Series Introduction The new Bradford White PDX2 and PDX water heaters are designed to provide reliable performance with enhanced standard features. New design features include reliable spark to pilot ignition system, enhanced diagnostics, simplified servicing, significantly quieter operation, additional vent lengths and certified FVIR technology. -
Page 5: How To Use This Manual
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. -
Page 6: Specifications
PDX Series Specifications Power supply Dedicated 115VAC, 60 Hz, 15A Gas Supply Pipe Minimum 1/2" NPT (schedule 40 black iron pipe recommended) Approved Gas Type Natural or Propane. Unit must match gas type supplied. Gas Pressure 5.0" W.C. min. for Nat gas, 11.0" W.C. min. for L.P. gas, 14.0" W.C. maximum (Nat. & L.P.) Venting System Power vent through the wall or vertical through the roof Approved Vent Materials... - Page 7 PDX Series Specifications Vent Tables Venting Specifications for: 48 Gallon 65 Gallon 75 Gallon This water heater is approved for installation with the following PVC, CPVC or ABS Schedule 40 venting material. The maximum and minimum vent lengths listed on this label are for the exhaust portion of the vent.
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Page 8: Control Timings
PDX Series Specifications Control Timings Ignition State Timing Pre-purge 2 Seconds Trial for Ignition 90 Seconds Flame Stabilization Period 3 Seconds Inter-purge 15 Seconds Flame Failure Response Time 1.5 Seconds (2 second. Maximum; 1 second minimum.) Post-purge 15 Seconds PS Fault Delay (failed open/close) Retry after 2 Minutes Soft Lockout Retry after 5 Minutes... -
Page 9: Sequence Of Operation
Sequence of Operation PDX Series Power up Sequence Start Up. Upon power up, the control runs a safe-start check with a typical start-up delay of 1-5 seconds. Flammable Vapor Check. To assure no outputs are energized if the “Flammable Vapor Sensor” is out of range, the control will test the the “Flammable Vapor Sensor”... - Page 10 PDX Series Sequence of Operation Normal Heating Sequence (cont.) Steady state operation. During Steady State Operation the Control Monitors: Thermostat temperature sensor- When set point temperature is satisfied, gas valve is shut down and blower will post purge for 15 seconds. Control LED flashes a short flash once every 4 seconds (idle) status code.
- Page 11 Sequence of Operation PDX Series Abnormal Operation (cont.) 3. Pressure Switch/Blower Temperature Fault: a) Pressure switch closed at start of call for heat - The control waits four seconds then, proceeds to flash 2 times with 3 second pause. The control waits 2 minutes and then turns on blower for 30 seconds. The blower turns off after 30 seconds and the control waits for pressure switch to open.
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Page 12: Troubleshooting
PDX Series Troubleshooting Green LED Indicator Observe green LED indicator on Electronic gas control. Error flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the troubleshooting table below. Control Service LED Status Probable Cause Status... - Page 13 PDX Series Troubleshooting Control Service LED Status Probable Cause Status Procedure 1. Unstable pilot. Failed to light 1. Page 14 2. Pilot tube blocked or restricted. Six-one flash, three pilot. 3. Oxidation build up on pilot electrode. second pause System auto 2-4.
- Page 14 PDX SERVICE PROCEDURE I PDX Series Burner Operation Inspection, Adjustment, Cleaning and Replacement Burner Inspection and Air Shutter Adjustment. At periodic intervals (every 6 months) a visual inspection should be made of the pilot and main burner for proper operation and to assure no debris is accumulating. Pilot flame should be stable, some causes for an unstable pilot flame are: a) Water heater vent is less than the allowable vent length.
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Page 15: Burner Cleaning
PDX SERVICE PROCEDURE I PDX Series Burner Operation Inspection, Adjustment, Cleaning and Replacement Burner Cleaning Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet. Step 2. Turn off gas supply to water heater. Step 3. -
Page 16: Pilot Testing, Cleaning And Replacement
PDX SERVICE PROCEDURE II PDX Series Pilot testing, Cleaning and Replacement Pilot Inspection, Testing and Replacement Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet. Step 2. Turn off gas supply to water heater. Step 3. -
Page 17: Pressure Switch Testing And Replacement
PDX SERVICE PROCEDURE III PDX Series Pressure Switch Testing and Replacement Exhaust Pressure Switch WARNING Testing 120 volt potential exposure. Use caution making voltage checks to avoid personal injury. Step 1. Position power switch on gas control to the “OFF” position. Step 2. - Page 18 PDX SERVICE PROCEDURE III PDX Series Pressure Switch Testing and Replacement Exhaust Pressure Switch WARNING Replacement 120 volt potential exposure. Use caution to avoid personal injury. Step 1. Position gas control power switch to “OFF” position. Step 2. Remove the three screws (Phillips screw driver) from control access cover on blower assembly and remove cover (see photo 3).
- Page 19 PDX SERVICE PROCEDURE III PDX Series Pressure Switch Testing and Replacement Inlet Pressure Switch WARNING Testing 120 volt potential exposure. Use caution making voltage checks to avoid personal injury. Step 1. Position power switch on gas control to the “OFF” position. Step 2.
- Page 20 PDX SERVICE PROCEDURE III PDX Series Pressure Switch Testing and Replacement Inlet Pressure Switch WARNING Replacement 120 volt potential exposure. Use caution to avoid personal injury. Step 1. Position gas control power switch to “OFF” position. Step 2. Remove the three screws (Phillips screw driver) from control access cover on blower assembly and remove cover (see photo 8).
- Page 21 PDX SERVICE PROCEDURE IV PDX Series Blower Testing and Replacement WARNING Blower Testing 115 volt potential exposure. Use caution when making voltage checks to avoid personal injury. Step 1. Position gas control power switch to “ON” position and adjust control to call for heat. Step 2.
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Page 22: Blower Testing And Replacement
PDX SERVICE PROCEDURE IV PDX Series Blower Testing and Replacement Blower removal Remove exhaust adapter and retain for Step 1. Position gas control power switch to the “OFF” position. use on new blower. Blower Mounting Step 2. Unplug blower power cord from wall outlet. Screws Step 3. -
Page 23: Blower Temperature Switch Testing And Replacement
PDX SERVICE PROCEDURE V PDX Series Blower Temperature Switch Testing and Replacement Blower Temperature Switch WARNING Testing. 120 volt potential exposure. Use caution to avoid personal injury. Step 1. Position power switch on gas control to the “OFF” position. Step 2. Remove tubing from inlet pressure tap. - Page 24 PDX SERVICE PROCEDURE V PDX Series Blower Temperature Switch Testing and Replacement Blower Temperature Switch WARNING Replacement. 120 volt potential exposure. Use caution to avoid personal injury. Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet. Step 2.
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Page 25: Thermal Well Testing
PDX SERVICE PROCEDURE VI PDX Series Gas Control/Thermal Well Testing and Replacement Gas Control Testing See pages 27 & 28 for gas control input & output testing. Thermal Well Testing Disconnect thermal well wire harness If Control has gone into TCO lockout due to excessive tank temperature (four flash, 3 second pause) reset control by rotating knob of temperature control to the minimum setting for at least 6 seconds... -
Page 26: Gas Control & Thermal Well Testing & Replacement
PDX SERVICE PROCEDURE VI PDX Series Gas Control/Thermal Well Testing and Replacement WARNING Stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Determine Water Temperature Inside Tank Note: It is important to understand once the resistance for the thermal well is determined from page 25, water flow through the heater should not occur. - Page 27 PDX SERVICE PROCEDURE VI PDX Series Gas Control & Thermal Well Testing and Replacement Gas Control & Thermal Well Removal From Water Heater Gas Control Step 1. Position gas valve power switch to the “OFF” Thermal position and Unplug Heater from power supply. Well Step 2.
- Page 28 PDX SERVICE PROCEDURE VI PDX Series Gas Control & Thermal Well Testing and Replacement Gas Control Assembly to Thermal Well Step 1. Install threaded end of thermal well into tank. Be sure thermal well flange is positioned as shown in photo 24 for proper control alignment.
- Page 29 PDX SERVICE PROCEDURE VII PDX Series Flammable Vapors Sensor Testing Flammable Vapor Device Testing Step 1. Position power switch on gas control to the “OFF” position. Step 2. Disconnect flammable vapor sensor from gas control. Step 3. Using a multi-meter set to the ohms setting check resistance of flammable vapor sensor.
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Page 30: Safety Circuit Voltage Trace
PDX SERVICE PROCEDURE VIII PDX Series Safety Circuit Voltage Trace Safety Circuit Voltage WARNING Trace 120 volt potential exposure. Use caution making voltage checks to avoid personal injury. NOTE: This procedure assumes a cool tank. Step 2. Remove three screws (Phillips Screw driver) from control access cover on blower and remove cover (see photo 26). -
Page 31: 115Vac Circuit Trace
PDX SERVICE PROCEDURE IX PDX Series 120 VAC Trace WARNING 120 VAC Circuit Trace 120 volt potential exposure. Use caution making voltage checks to avoid personal injury. Step 1. Verify 120VAC and proper polarity at wall outlet. Step 2. With unit plugged in and control power switch in the “ON” position verify LED status. LED status LED status LED status... -
Page 32: Dip Tube Inspection And Replacement
PDX SERVICE PROCEDURE X PDX Series Dip Tube Inspection and replacement Dip Tube Inspection and Replacement WARNING Water Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Step 1. -
Page 33: Anode Inspection And Replacement
PDX SERVICE PROCEDURE XI PDX Series Anode Inspection and replacement Anode Inspection and Replacement WARNING Water Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Step 1. Position on/off switch of gas control valve to the “OFF”... -
Page 34: Flue Baffle Inspection And Replacement
PDX SERVICE PROCEDURE XII PDX Series Flue Baffle Inspection and replacement Remove blower to gain access to Disconnect vent system from exhaust flue baffle adapter. Blower Mounting Step 1. Position gas control power switch to the “OFF” position and Screws unplug blower from wall outlet. - Page 35 PDX SERVICE PROCEDURE XIII PDX Series Inner Door/Gasket Removal, Inspection Replacement and Reinstallation Inner Door Removal Procedure. Step 1. Slide switch of the Electronic Gas Control to the “OFF” position and unplug from wall. Step 2. Remove outer jacket burner access door. Step 3.
- Page 36 PDX SERVICE PROCEDURE XIII PDX Series Inner Door/Gasket Removal, Inspection Replacement and Reinstallation Installation of Inner Door With Gasket. WARNING Stripped fastener connections may allow Step 7. Clean any residual gasket residue or other debris for seal breach of inner door. A seal from combustion chamber surface before installing breach may result in a fire or explosion the inner door/gasket assembly.
- Page 37 PDX SERVICE PROCEDURE XIII PDX Series Inner Door/Gasket Removal, Inspection Replacement and Reinstallation Installation of inner door with gasket (continued from page 36). Step 10. Firmly place right side inner door flange against the left side inner door flange and secure with two ¼” drive screws from step 3c.
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Page 38: Glossary Of Terms
PDX Series Glossary of Terms British Thermal Units Gallons per Minute Hertz KW/h Killo-watts per hour Light Emitting Diode National Pipe Thread Ohms Ohms of resistance Pounds per Square Inch Revolutions per Minute Temperature Cut Off Volts Alternating Current W.C. Inches of Water Column °C Degrees Centigrade... -
Page 39: Parts List
PDX Series Parts List 1. Blower Assembly 15. Hot Water Outlet Anode 28. Screw-#8-18 x ¾ HWH 41. Gas Pilot Orifice (Nat.) 2. Blower Temp. Switch 16. Cold Water Inlet Diptube 29. Brass Drain Valve 42. Gas Feedline (Nat.) 3. Exhaust Pressure Switch 17. - Page 40 Email parts@bradfordwhite.com techserv@bradfordwhite.com www.bradfordwhite.com...