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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 Save this manual for future reference
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Bradford White PDX Series Powered Direct Vent Gas Water Heaters Table of Contents Page TTW Service Procedure Introduction 4 - - - How to use this manual 5 - - - Tool required for service 5 - - - Specifications 6 - - - Control Timings 8 - - - Sequence of Operation 9 - - - Troubleshooting 12 - - - Burner Inspection, Cleaning and Replacement 14 I Pilot Testing, Cleaning and Replacement 16 II Pressure Switch Testing and Replacement 17 III Blower Testing and Replacement 21 IV Blower Temperature Switc
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PDX Series WARNING: If the information in these CAUTION 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. warranty. FOR YOUR SAFETY DANGER Do not store or use gasoline or other Do not store or use gasoline or flammable, combustible, or corrosive vapors other flammable, combustible, or and liquids in the vicinity of this or an
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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. Spark to Pilot Ignition System - employing the spark to pilot ignition system promotes reliable and consistent pilot and main burner ignitions to p
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How to Use This Manual PDX Series 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
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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.) Venting System Power vent through the wall or vertical through the roof Approved Vent Materials PVC, CPVC or ABS Minimum Clearance 18" from top, 24" from front, 4" sides and rear.
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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. The intake portion of the vent must be equal to or less than the length of the exhaust. 3" Diameter (7.6 cm) PVC Vent Connector Lengths Maximum 48, 65 gal. Maximum 75 gal. # of Terminating Ma
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Specifications PDX Series 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 TCO Limit Lockout Indefinite (cycle power to restart) Verify Resistive Delay Retry after 2 Minutes (repeats 5 times) Simulated Resist
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Sequence of Operation PDX Series Power up Sequence 1 Start Up. Upon power up, the control runs a safe-start check with a typical start-up delay of 1-5 seconds. 2 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” for proper operating range. If the “Flammable Vapor Sensor” is within range the control resumes normal operation with no perceptible delay. If the “Flammable Vapor Sensor” is o
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Sequence of Operation PDX Series Normal Heating Sequence (cont.) Steady state operation. 7 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. Pressure switch / Blower temperature switch- If either switch opens, pilot valve and main valve is shut down. The blower continues to runs for 3
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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. Any time the Pressure switch opens, the blower turns on (or stays on) and the control proceeds to w
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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. Control Service LED Status Probable Cause Status Procedure None, control LED not No electrical Control power switch in “OFF” position. Turn power on on or flashing power Supply voltage interrupted. Stand-by mode, Normal operation. Short flash, once
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Troubleshooting PDX Series 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 16 4. Wire damage to pilot assembly or bad resets. connection at gas valve. 1. Check vent or vent tables. Pressure switch 1. Vent blockage or improper vent configuration. or blower temp 2. Pressure switch tubing kinked or bloc
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PDX SERVICE PROCEDURE I Burner Operation Inspection, PDX Series 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. b) Gas pressure is out of specification. c) Pilot f
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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. Step 3. Remove outer jacket door and inner door per service procedure XIII on page 35. Igniter/flame sense wire Step 4. Disconnect pilot tube (7/16 wrench) and feedline (¾ wrench) from gas control. Feedline nut Step 5. Disconnect ignite
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PDX SERVICE PROCEDURE II Pilot testing, Cleaning and Replacement PDX Series 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. Remove outer jacket door and remove inner door per service proceedure XIII on page 35. Igniter/flame sense wire Step 4. Disconnect pilot tube nut (7/16 wrench) and feedline nut Feedline nut (¾ wrench) from gas control. Pilot tub
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PDX SERVICE PROCEDURE III Pressure Switch Testing and PDX Series 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. Remove the three screws (Phillips screw driver) from control access cover on blower assembly and remove cover (see photo 1). Step 3. Remove tubing and wires from inlet pressure switch. Step 4. Carefully remove pressure
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PDX SERVICE PROCEDURE III Pressure Switch Testing and PDX Series 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). Step 3. Disconnect the tubing and wires from inlet pressure switch. Pressure Switch 4 3 Step 4. Carefully remove pres
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PDX SERVICE PROCEDURE III Pressure Switch Testing and PDX Series 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. Remove the three screws (Phillips screw driver) from control access cover on blower assembly and remove cover (see photo 7). Step 3. Remove wires from inlet pressure switch. Exhaust pressure switch 7 Inlet pressure switc
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PDX SERVICE PROCEDURE III Pressure Switch Testing and PDX Series 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). Step 3. Disconnect the tubing from the pressure switch (see photo 9). 8 9 Step 4. Remove inlet pressure switch from blo
