Bradford White PDX275T6*FBN Service Manual

Bradford WhitePDX SeriesPowered Direct Vent Gas Water HeatersSave this manual for future referenceManual 46925A(*) Denotes Warranty YearsSERVICEMANUAL

Steady state operation.During Steady State Operation the Control Monitors:Thermostat temperature sensor- When set point temperature is satisfied, gas

Sequence of OperationAbnormal Operation (cont.)3. Pressure Switch/Blower Temperature Fault:a) Pressure switch closed at start of call for heat - The c

Short flash, once everyfour seconds“Heartbeat”, alternatesbright/dimThermostat callingfor heat (no fault).Short flash once persecondWeak pilot signalo

Six-four flash, threesecond pauseUndesired-falsepilot flamesensed.System autoresets.Seven flash, threesecond pauseFlammable VaporSensor faultdetectedE

Step 1. With main burner in operation, remove outer jacket door remove inner door as described in this manual,see inner door removal, inspection and r

Burner CleaningStep 1. Position gas control power switch to the “OFF” position and unplug heater from walloutlet.Step 2. Turn off gas supply to water

PDX SERVICE PROCEDURE IIPilot testing, Cleaning and ReplacementPilot Inspection, Testing and ReplacementStep 1. Position gas control power switch to

PDX SERVICE PROCEDURE IIIPressure Switch Testing andReplacementExhaust Pressure SwitchTestingWARNING120 volt potential exposure. Use cautionmaking vol

Exhaust Pressure SwitchReplacementWARNING120 volt potential exposure. Use cautionto avoid personal injury.Step 7. Reconnect wires from step 5 to new p

PDX SERVICE PROCEDURE IIIPressure Switch Testing andReplacementInlet Pressure SwitchTestingWARNING120 volt potential exposure. Use cautionmaking volta

Bradford WhitePDX SeriesPowered Direct Vent Gas Water HeatersTable of ContentsPage TTW Service ProcedureIntroduction 4 - - -How to use this manual 5

Inlet Pressure SwitchReplacementWARNING120 volt potential exposure. Use cautionto avoid personal injury.Step 7. Reconnect wires from step 5 to new pre

PDX SERVICE PROCEDURE IVBlower Testing and ReplacementWARNING115 volt potential exposure. Use caution whenmaking voltage checks to avoid personal inj

PDX SERVICE PROCEDURE IVBlower Testing and ReplacementStep 1. Position gas control power switch to the “OFF” position.Step 2. Unplug blower power cor

PDX SERVICE PROCEDURE VBlower Temperature Switch Testingand ReplacementBlower Temperature SwitchTesting.WARNING120 volt potential exposure. Use cauti

PDX SERVICE PROCEDURE VBlower Temperature Switch Testingand ReplacementBlower Temperature SwitchReplacement.WARNING120 volt potential exposure. Use c

PDX SERVICE PROCEDURE VIGas Control/Thermal Well Testing andReplacementPDX SeriesThermal Well TestingThermal well testingPosition gas control power s

°F012345678 940 26109 25400 24712 24045 23399 22771 22163 21573 21000 2044550 19906 19383 18876 18383 17905 17440 16990 16553 16128 1571560 15314 1492

PDX SERVICE PROCEDURE VIGas Control & Thermal Well Testingand ReplacementGas Control & Thermal Well Removal From Water HeaterStep 1. Position

Gas Control Assembly to Thermal WellStep 6. Reconnect wire harnesses to gas controlper the illustration.Step 7. Reconnect gas piping to gas control.Re

PDX SERVICE PROCEDURE VIIFlammable Vapors Sensor TestingPage 29PDX SeriesFlammable VaporSensorStep 1. Position power switch on gas control to the“OFF

WARNING: If the information in theseinstructions is not followed exactly, a fire orexplosion may result causing property damage,personal injury, or d

PDX SERVICE PROCEDURE VIIISafety Circuit Voltage TraceSafety Circuit VoltageTraceWARNING120 volt potential exposure. Use cautionmaking voltage checks

PDX SERVICE PROCEDURE IX120 VAC TraceWARNING120 volt potential exposure. Use cautionmaking voltage checks to avoid personal injury.Disconnect cord set

PDX SERVICE PROCEDURE XDip TubeInspection and replacementStep 1. Position on/off switch of gas control valve to “OFF” position and unplug water heate

PDX SERVICE PROCEDURE XIAnodeInspection and replacementStep 1. Position on/off switch of gas control valve to the “OFF” position and unplug water heat

PDX SERVICE PROCEDURE XIIFlue BaffleInspection and replacementStep 1. Position gas control power switch to the “OFF” position andunplug blower from wa

PDX SeriesStep 4. Right side Inner Door Removal.a) Remove wire tie from feedline.b) Remove (2) 1/4" hex drive screws from right side inner door.c

PDX SeriesInstallation of Inner Door With Gasket.WARNINGStripped fastener connections may allowfor seal breach of inner door. A sealbreach may result

PDX SeriesStep 10. Firmly place right side inner door flange against the left side inner door flange and secure with two ¼” drivescrews from step 3c.

NOTESPage 38Glossary of TermsBTU British Thermal UnitsGPM Gallons per MinuteHz HertzKW/h Killo-watts per hourLED Light Emitting DiodeNPT National Pipe

Parts List1. Blower Assembly2. Blower Temp. Switch3. Exhaust Pressure Switch4. Inlet Pressure Switch5. Blower Gasket6. Tee and Vent Pipe Assy.7. Vent

Page 4IntroductionThe new Bradford White PDX2 and PDX water heaters are designed to provide reliableperformance with enhanced standard features. New d

[email protected]@bradfordwhite.comwww.bradfordwhite.com

Tools Required for ServiceIt is intended for this manual to be used by qualified service personal for the primary purpose oftroubleshooting and repair

SpecificationsThermal well TCO Limit Residential 188°F (87°C), Commercial 199°F (93°C)Residential TemperatureSet Point Range60°F (16°C) to 160°F (71°C

SpecificationsVenting Specifications for:48 Gallon65 Gallon75 GallonThis water heater is approved for installation with the following PVC, CPVC or ABS

Control TimingsIgnition State TimingPre-purge 2 SecondsTrial for Ignition 90 SecondsFlame Stabilization Period 3 SecondsInter-purge 15 SecondsFlame Fa

Sequence of OperationThermostat calls for heat.Prior to energizing blower, gas control checks safety circuit to insure the circuit is open. Normal swi