Honeywell PDX150SF(BN,SX,CX) User Manual

Save this manual for future referenceManual 238-49770-00ASERVICEMANUALTroubleshooting Guideand Instructions for Service(To be performed ONLY byqualifi

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

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

Sequence of Operation3. Pressure Switch/Blower Temperature Fault:a) Pressure switch closed at start of call for heat - The control waits four seconds

Short flash, once every four seconds“Heartbeat”, alternates bright/dimThermostat callingfor heat (no fault).Short flash once per secondWeak pilot sign

Six-four flash, three second pauseUndesired-false pilot flame sensed.System auto resets. Seven flash, three second pauseFlammable Vapor Sensor fault d

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

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 and ReplacementPressure Switch TestingWARNING120 volt potential exposure. Use cautionmaking voltage

Exhaust Pressure Switch ReplacementWARNING120 volt potential exposure. Use cautionto avoid personal injury.Step 6. Reconnect wires from step 5 to new

Table of ContentsPage PDX Service ProcedureIntroduction 4 - - -How to use this manual 5 - - -Tool required for service 5 - - -Specifications 6 - - -Co

PDX SERVICE PROCEDURE IVBlower Testing and ReplacementWARNING115 volt potential exposure. Use caution when making voltage checks to avoid personal in

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 Testing and ReplacementBlower Temperature Switch Testing.WARNING120 volt potential exposure. Use cau

PDX SERVICE PROCEDURE VBlower Temperature Switch Testing and ReplacementBlower Temperature Switch Replacement.WARNING120 volt potential exposure. Use

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

°F 012345678 940 26109 25400 24712 24045 23399 22771 22163 21573 21000 2044550 19906 19383 18876 18383 17905 17440 16990 16553 16128 1571560 15314 149

PDX SERVICE PROCEDURE VIGas Control & Thermal Well Testing and ReplacementGas Control & Thermal Well Removal From Water HeaterStep 1. Positio

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

PDX SERVICE PROCEDURE VIIFlammable Vapors Sensor TestingPage 28PDX Series Flammable Vapor SensorStep 1. Position power switch on gas control to the “

PDX SERVICE PROCEDURE VIIISafety Circuit Voltage TraceSafety Circuit Voltage TraceWARNING120 volt potential exposure. Use cautionmaking voltage check

WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or

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

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 hea

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

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.

PDX SeriesInstallation of Inner Door With Gasket.WARNINGStripped fastener connections may allow for seal breach of inner door. A seal breach may resul

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.

PDX SeriesFrozen intake or exhaust vent terminalIf an intake or exhaust vent terminal is blocked with ice or snow due to severe conditions, the pressu

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. Pressure Switch4. Blower Gasket5. Tee and Vent Pipe Assy.6. Vent Adapter with Term.7. Intake Term

Page 4IntroductionThe new Bradford White PDX1, PDX2 and PDX4 water heaters are designed to provide reliable performance with enhanced standard feature

Tools Required for ServiceIt is intended for this manual to be used by qualified service personal for the primary purpose of troubleshooting and repai

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

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

SpecificationsPart II-Venting Specifications for:40 Gallon50 GallonThrough the WallTerminating# ofElbows(excl. vent term.)MaximumstraightLength ft (m)

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