Bradford White D4504S*F(BN Service Manual

Save this manual for future referenceManual 238-48385-00ASERVICEMANUALTroubleshooting Guideand Instructions for Service(To be performed ONLY byqualifi

Page 10 Normal Heating Sequence (cont’d) 7. Steady State Operation: During steady state operation, the gas control monitors: Thermostat Temperature Se

Page 11 Abnormal Operation (cont’d) 2. Temperature Sensor Fault:A) Temperature Sensor Open Circuit: The gas control immediately turns off all out-puts

Page 12 Abnormal Operation (cont’d)5. Flame Sensing Fault:A) Flame Lost During Run: The gas control turns off pilot and main valves. The gas control

Page 13 LED Status Control Status Probable Cause Service ProcedureNone (LEDnot on orflashing)Ele ctrical pow er notpresentControl power switch in &quo

Page 14 LED Status Control Status Probable Cause Service ProcedureSix flashes,two flashes,three secondpause (SoftLockout)Damper test circuitnot workin

Page 15 Burner InspectionAt periodic intervals (every 6 months), a visual inspection should be made of the pilot and main burner for proper operation

Page 16 Burner Cleaning Procedure (cont’d) Step 5. Remove the (4) 1/4” hex drive screws holding the right side inner door in place. Step 6. Disconnec

Page 17 Burner Cleaning Procedure (cont’d) Step 12. Reassemble the burner assembly and reinstall into the water heater. Restore gas supply and check

Page 18 Pilot Inspection, Testing and Replacement (cont’d) Step 7. Disconnect the spark igniter/flame sensor wire from gas control. Step 8. Remove t

Page 19 Pilot Inspection, Testing and Replacement (cont’d) Step 14. Visually inspect the pilot tubing for kinks or cracks. If damage is found,replac

Page 2 Table of Contents Section PageIntroduction ______________________________________________5 How to Use this Manual _____________________________

Page 20 Damper Removal & Installation (cont’d)Step 3. Disconnect the vent system from the draft hood that is mounted on top of the damper. Step 4

Page 21 Damper Removal & Installation (cont’d)Step 13. Reconnect the cord sets from Step 5. Step 14. Plug the water heater into the wall outlet.

Page 22 Thermal Well Testing (cont’d)Determine the correct resistance values using the Determine the Water Temperature Inside the Tank procedure on pa

Page 23 Sensor Resistance at Various TemperaturesGas Control & Thermal Well Removal From Water Heater Step 1. Move the gas control power switch t

Page 24 Gas Control & Thermal Well Removal From Water Heater (cont’d)Step 4. Disconnect the pilot tube using a 7/16” wrench and the main burner fe

Page 25 Gas Control Removal From Thermal Well (cont’d)Step 3. Turn off the gas supply to the water heater and disconnect the gas piping from the gas

Page 26 Gas Control Assembly to the Thermal Well (cont’d) Step 2. Route the wire leads back into relief opening. Step 3. Align the slots located on

Page 27 Gas Control Assembly to the Thermal Well (cont’d) Step 8. To resume operation, follow the instructions located on the water heater lighting i

Page 28 Dip Tube Inspection and Replacement Step 1. Move the gas control power switch to the “OFF” position Step 2. Unplug the water heater from t

Page 29 Anode Inspection and Replacement Step 1. Move the gas control power switch to the “OFF” position Step 2. Unplug the water heater from the wa

WARNINGIf the information in these instructions is not followed exactly, a fire or explosion may re-sult causing property damage, personal injury, or

Page 30 Remove the Damper to Gain Access to the Flue Baffle Step 1. Move the gas control power switch to the “OFF” position.Step 2. Unplug the water

Page 31 Remove the Damper to Gain Access to the Flue Baffle (cont’d) Step 6. Remove the damper from the top of the water heater.Step 7. Remove the fl

Page 32 Inner Door Removal Procedure Step 1. Move the gas control power switch to the “OFF” position.Step 2. Unplug the water heater from the wall o

Page 33 Inner Door Removal Procedure (cont’d) Step 7. Inspect both inner doors for any of the following imperfections: tears,missing material, cracks

Page 34 Inner Door Installation with Gasket Step 1. Clean any residual gasket residue or other debris from the combustion chamber surface before inst

Page 35 ScreenLok®Flame Arrestor Cleaning Procedure Step 1. Move the gas control power switch to the “OFF” position and unplug the water heater from

Page 36 Damper Relay Installation (cont’d) Step 2. Unplug the water heater from the wall outlet. Step 3. Disconnect the vent system from the draft

Page 37 Damper Relay Installation (cont’d)Step 9. Turn the damper on its side and lay it on top of the water heater. Step 10. Remove the Red wire i

Page 38 Common Terms BTU British Thermal Units ECO Energy Cut Off GPM Gallons per Minute Hz Hertz KWh Kilowatts per hour LED Light Emitting Dio

Page 39 12345678910121314151615A171819202122232426271125PART NAME AND DESCRIPTION 1. Draft Hood 15. Inner Door (Right)2. Damper 15A. Resettable Therma

Page 4 WARNINGWater heaters are heat producing appliances. To avoid damage or injury, do not store materials against the water heater or any of its c

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Page 5 The Bradford White DEFENDER Safety System®The Bradford White DEFENDER Safety System was designed to resist the ignition of flamma-ble vapors th

Page 6 combustion chamber, the vapors are harmlessly ignited by the burner. If flammable vapors are in sufficient quantity to prevent normal combustio

Page 7 Power Supply Dedicated 120VAC, 60 Hz, 15A Gas Supply Pipe Minimum 1/2” NPT (Schedule 40 black iron pipe recommended) Approved Gas Type Natural

Page 8 Ignition State Timing Adjust Damper Position and Verify (Open Posi-tion) 15 seconds Trial for Ignition 90 seconds Flame Stabilization Period

Page 9 Power Up Sequence1. Start-up: Upon power up, the gas control runs a safe start check with a typical de-lay of 5 seconds. 2. Flammable Vapor Ver