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Powered Direct Vent Gas Water Heaters
Manual 238-49770-00A
PDX Series
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
PDX Series Models:
PDX140S*F(BN,SX,CX)
PDX150S*F(BN,SX,CX)
PDX440S*F(BN,SX)
PDX450S*F(BN,SX)
PDX250T*F(BN,SX,CX)
PDX265T*F(BN,SX,CX)
PDX275T*F(BN,SX,CX)
PDX50S60F(B,S,C)*(N,X)
PDX65S65F(B,S,C)*(N,X)
PDX75S70F(B,S,C)*(N,X)
(*) Denotes Warranty Years
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Table of Contents
Related Manuals for Bradford White PDX Series
Summary of Contents for Bradford White PDX Series
- Page 1 PDX Series Powered Direct Vent Gas Water Heaters SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: PDX Series Models: PDX140S*F(BN,SX,CX) PDX150S*F(BN,SX,CX) PDX440S*F(BN,SX) PDX450S*F(BN,SX) PDX250T*F(BN,SX,CX) PDX265T*F(BN,SX,CX) PDX275T*F(BN,SX,CX) PDX50S60F(B,S,C)*(N,X) PDX65S65F(B,S,C)*(N,X)
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Page 2: Table Of Contents
Table of Contents Page PDX Service Procedure Introduction - - - How to use this manual - - - Tool required for service - - - Specifications - - - Control Timings - - - Sequence of Operation - - - Troubleshooting - - - Burner Inspection, Cleaning and Replacement... - Page 3 PDX Series CAUTION WARNING: If the information in these instructions is Incorrect operation of this appliance may not followed exactly, a fire or explosion may result create a hazard to life and property and causing property damage, personal injury, or death.
- Page 4 PDX Series Introduction The new Bradford White PDX1, PDX2 and PDX4 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 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 PDX Series water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting the water heater.
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Page 6: Specifications
Specifications PDX Series 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.) - Page 7 Specifications PDX Series 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.
- Page 8 Specifications PDX Series Vent Tables Part II-Venting Specifications for: 40 Gallon 50 Gallon IMPORTANT The minimum equivalent length for the exhaust portion of the vent is 7 feet. The maximum equivalent vent length for the exhaust is 35 feet for 2" diameter pipe and 85 feet for 3" diameter pipe. The intake portion of the vent must be equal to or less than the vent length of the exhaust.
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Page 9: Control Timings
PDX Series Specifications Control Timings Ignition State Timing Pre-purge 15 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) -
Page 10: Sequence Of Operation
Sequence of Operation PDX Series 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 11 Sequence of Operation PDX Series 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 12 Sequence of Operation PDX Series 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 13: Troubleshooting
Troubleshooting PDX Series 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. Service LED Status... - Page 14 Troubleshooting PDX Series Service LED Status Control Status Probable Cause Procedure 1. Unstable pilot. 1. Page 15 2. Pilot tube blocked or restricted. Six-one flash, three Failed to light pilot. 3. Oxidation build up on pilot electrode. 2-4. Page 17 second pause System auto resets.
- Page 15 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.
- Page 16 PDX SERVICE PROCEDURE I Burner Operation Inspection, PDX Series 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.
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Page 17: 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. -
Page 18: Pressure Switch Testing And Replacement
PDX SERVICE PROCEDURE III PDX Series Pressure Switch Testing and Replacement Pressure Switch Testing WARNING 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. - Page 19 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).
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Page 20: Blower Testing And Replacement
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. - Page 21 PDX SERVICE PROCEDURE IV PDX Series Blower Testing and Replacement Blower removal Remove exhaust adapter and retain for use on Step 1. Position gas control power switch to the “OFF” position. new blower. Step 2. Unplug blower power cord from wall outlet.
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Page 22: 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. - Page 23 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.
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Page 24: Gas Control & Thermal Well Testing & Replacement
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... - Page 25 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 26 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.
- Page 27 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 22 for proper control alignment.
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Page 28: Flammable Vapor Sensor Testing & Replacement
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. -
Page 29: 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 24). -
Page 30: 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. -
Page 31: 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. -
Page 32: 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. -
Page 33: 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 adapter. flue baffle Blower Mounting Step 1. Position gas control power switch to the “OFF” position and Screws unplug blower from wall outlet. -
Page 34: Inner Door Removal, Inspection & Replacement
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. - Page 35 PDX SERVICE PROCEDURE XIII PDX Series Inner Door/Gasket Removal, Inspection Replacement and Reinstallation Installation of Inner Door With WARNING Gasket. Stripped fastener connections may allow Step 7. Clean any residual gasket residue or other debris for seal breach of inner door. A seal...
- Page 36 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.
- Page 37 Bradford White or the supplier of the water heater for information about ordering the optional concentric vent terminal. Bradford White has also developed an air intake relief device that can be installed in the air intake near the water heater temporarily enabling the water heater to operate with a frozen intake terminal.
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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. -
Page 39: Parts List
Parts List PDX Series 1. Blower Assembly 15. Cold Water Inlet Diptube 28. Brass Drain Valve 41. Gas Feedline (Nat.) 2. Blower Temp. Switch 16. Flue Baffle 29. Flammable Vapor Sensor 42. Gas Burner Assy (L.P.) 3. Pressure Switch 17. Blower Harness 30.