Bradford White URG1D30T*N Service Manual
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Bradford White URG1D30T*N Service Manual

Ultra low nox residential d series gas water heaters
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Manual 238 51673 00A 10/15
Ultra Low NOx
Residential D Series
Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
URG1D30T*N
URG1D40S*N
URG1D40T*N
URG1D50T*N
(*) Denotes Warranty Years
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Summary of Contents for Bradford White URG1D30T*N

  • Page 1 SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: URG1D30T*N URG1D40S*N URG1D40T*N URG1D50T*N (*) Denotes Warranty Years Manual 238 51673 00A 10/15 Save this manual for future reference...

  • Page 2: Table Of Contents

    The Bradford White Ultra Low NOx Residential D Series Gas Water Heaters Table of Contents Page D Service Procedure Introduction ..............................4 How to Use This Manual ..........................5 Tools Required for Service .......................... 5 Specifications ..............................6 Control Timings ............................7 Sequence of Operation ..........................
  • Page 3 ULN Res. D Series WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, DANGER personal injury, or death. Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance.

  • Page 4: Introduction

    The Bradford White Introduction The new Bradford White Ultra Low NOx Residential Flue Damper 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 quiet operation, and the Bradford White Defender Safety System.

  • Page 5: Tools Required For Service

    Contact the Bradford White technical support group immediately if diagnosis connot be made using the methods described in this service manual.
  • Page 6 ULN Res. D Series Power supply Dedicated 115 VAC, 60 Hz, 15A Gas Supply Pipe Minimum 1/2” NPT (schedule 40 black iron pipe recommended) Approved Gas Natural Gas unit must match gas type supplied Type Gas Pressure 6.0” w.c. min., 14.0” w.c. maximum Venting System Single or Double Wall Metal Vent Pipe Minimum...

  • Page 7: Control Timings

    ULN Res. D Series Control Timings Ignition State Timing Adjust Damper Position and Verify (Open 15 Seconds Position) Trial for Ignition 90 Seconds Flame Stabilization Period 3 Seconds Re-adjust Damper Position and Verify 15 Seconds Flame Failure Response Time 1.5 Seconds (2 second maximum; 1 second minimum.) Adjust Damper Position and Verify (Closed 15 Seconds Position)

  • Page 8: Power Up Sequence

    ULN Res. D Series Power Up Sequence 1. Start Up. Upon power up, the control runs a safe-start check with a typical start-up delay of 5 seconds. 2. Flammable Vapor. The gas control verifies that the Flammable Vapor Sensor is in the proper operating range prior to energizing any components.
  • Page 9 ULN Res. D Series Normal Heating Sequence (cont.) 7. Steady state operation. During steady state operation, the control monitors: Thermostat Temperature Sensor-when setpoint temperature is satisfied, gas valve is shut down and damper is powered closed. The gas control LED flashes a short flash once every 4 seconds (idle) status code.
  • Page 10 ULN Res. D Series Abnormal Operation (cont.) b. Thermal Well Sensor Not Reading the Same Temperature Within ±5.5°F –The gas control immediately turns off all outputs and proceeds to flash 8 times, then 3 times twice with 3 second pauses. The status self clears if the fault clears for at least 15 seconds.

  • Page 11: Troubleshooting

    ULN Res. D Series Observe green LED indicator on electronic gas control. Status flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the troubleshooting table below. Service Procedure LED Status Control Status Probable Cause None, control...
  • Page 12 ULN Res. D Series Service Procedure LED Status Control Status Probable Cause 1. Unstable pilot. 1. See Burner Inspection on Failed to light Six-one 2. Pilot tube blocked or restricted. page 14. flash, three pilot. 3. Oxidation build up on pilot electrode. 2.
  • Page 13 ULN Res. D Series Service Procedure LED Status Control Status Probable Cause Nine-One flash, Insufficient Insufficient combustion air Page 37. three second combustion air pause detected. Chamber Nine-two flash, 1. Chamber sensor out of calibration. Test Chamber door temperature three second sensor out of 2.

  • Page 14: Burner Inspection, Cleaning & Replacement

    ULN Res. D Series Burner Inspection 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.

  • Page 15: Burner Cleaning

    ULN Res. D Series Burner Cleaning Step 1. Position the gas control power switch to the “OFF” position and unplug the heater from the wall outlet. Step 2. Turn off gas supply to the water heater. Step 3. Remove outer jacket door. Step 4.
  • Page 16 ULN Res. D Series Burner Cleaning (cont.) Step 9. Remove manifold mount from burner inner door by removing (2) ¼” hex drive screws. Step 10. Use a stiff brush, compressed air and/or a vacuum to remove any debris build up from the manifold mount.

  • Page 17: Pilot Testing, Cleaning & Replacement

    ULN Res. D Series Pilot Testing and Replacement Step 1. Visually inspect igniter/flame sense electrode for oxidation build up. Carefully clean any oxidation using very fine emery cloth. Step 2. Remove pilot assembly from the burner assembly (¼” nut driver). Step 3.

  • Page 18: Damper Removal & Installation

    ULN Res. D Series Damper Removal & Installation Step 1. Position the power switch on the gas control to the “OFF” position and unplug the water heater from the wall outlet. Step 2. Disconnect the vent system from the draft hood that is mounted on top of the damper Step 3.

  • Page 19: Gas Control Testing & Replacement

    ULN Res. D Series Line Pressure The gas control is designed for a maximum line pressure of 14.0” W.C. and a minimum line pressure of 1.0” W.C. over the water heater’s rated manifold pressure (check rating plate). Line pressure must be checked with the main burner on and off to assure proper readings.

  • Page 20: Determine Water Temperature Inside Tank

    ULN Res. D Series ECO (Energy Cut Out) The Honeywell gas control is designed with an ECO device that will reset. To reset the gas control after a status code (4), turn the gas control knob to the “OFF” position and wait a minimum of (5) minutes before relighting following the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation manual.
  • Page 21 ULN Res. D Series Gas Control Removal From Water Heater Step 1. Position the gas control power switch to the “OFF” position and unplug heater from wall outlet. Step 2. Drain the heater to a point below the gas control level. Step 3.

  • Page 22: Flammable Vapor Device Testing And Replacement

    ULN Res. D Series Flammable Vapor Testing Step 1. Position power switch on gas control to the “OFF” position. Step 2. Remove the outer door. Step 3. Disconnect the black wire leads from the FVIR sensor. Step 4. Using a multi-meter set to the ohms setting, check resistance of flammable vapor sensor.

  • Page 23: Diptube Inspection & Replacement

    ULN Res. D Series Diptube Inspection & 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. Position the on/off switch of the gas control valve to the “OFF” position and unplug the water heater from the wall outlet.

  • Page 24: Anode Inspection & Replacement

    ULN Res. D Series Anode Inspection & 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. Position the on/off switch of the gas control valve to the “OFF” position and Step 1.

  • Page 25: Flue Baffle Inspection & Replacement

    ULN Res. D Series Flue Baffle Inspection and Replacement Step 1. Position the on/off switch of the gas control valve to the “OFF” position and unplug the water heater from the wall outlet. Step 2. Disconnect the vent system from the draft hood that is mounted on top of the damper.
  • Page 26 ULN Res. D Series Flue Baffle Inspection and Replacement (cont.) Step 6. Carefully remove the damper from the top of the water heater. Step 7. Remove the flue baffle from the water heater. Step 8. Inspect the baffle for deterioration and missing restrictors.

  • Page 27: Inner Door Removal, Inspection & Replacement

    ULN Res. D Series Inner Door Removal Procedure Step 1. Position gas control power switch to the “OFF” position. Step 2. Remove outer jacket burner access door. Step 3. Remove (2) ¼” hex drive screws from right side inner door. Step 4.
  • Page 28 ULN Res. D Series Step 9. Use RTV sealant (recommended bead size 1/8”) to secure the inner door gasket to the inner door sections (right & left). Refer to illustration below for proper application. Note the overlap configuration in the flange area of the inner door. Set the flange section first, this will help to achieve the proper overlap position.
  • Page 29 ULN Res. D Series Installation of Inner Door With Gasket (cont.) Step 13. Firmly place right side inner door flange against the left side inner door flange and secure with (2) ¼” hex drive screws from step 4. DO NOT OVER TIGHTEN SCREWS.

  • Page 30: 115 Vac Circuit Trace

    ULN Res. D Series 115 VAC Circuit Trace Step 1. Verify 115 VAC and proper WARNING polarity at wall outlet. 115 volt potential exposure. Use Step 2. With unit plugged in and caution to avoid personal injury. control power switch in the “ON”...

  • Page 31: Damper Relay Installation

    ULN Res. D Series Damper Relay Installation If the damper fails and the water heater operation is necessary temporarily, a relay, p/n 233-47642-00, and harness, p/n 239-51714-00, can be ordered from the Bradford White Service Parts Department. Position the gas control power switch Step 1.
  • Page 32 ULN Res. D Series Damper Relay Installation (cont.) Remove the Red wire Step 8. in the damper housing from its location. Connect the ¼” Red female connector on the relay harness in its place Remove the Yellow wire Step 9. in the damper housing from its location.
  • Page 33 ULN Res. D Series Damper Relay Installation (cont.) Secure the damper housing cover in place using the screws from step 5. Step 15. Re-install the draft hood from Step 3. Step 16. Reconnect the vent system to the draft hood. Step 17.

  • Page 34: Chamber Sensor Testing

    ULN Res. D Series Chamber Sensor Testing Position the gas control power switch to Step 1. the “OFF” position and unplug the water heater from the wall outlet. Disconnect flammable vapor sensor Step 2. harness from the gas control. Remove the outer door. Step 3.

  • Page 35: Resettable Thermal Switch, Inspection & Replacement

    ULN Res. D Series Resettable Thermal Switch Continuity Testing Remove outer jacket door. Step 1. Disconnect black wire leads from the resettable Step 2. thermal switch. Using a multimeter capable of measuring Step 3. continuity (Ohms), place one probe of the meter on one of the brass connection tabs of the resettable thermal switch, and the remaining probe on the other connection tab.
  • Page 36 ULN Res. D Series Resettable Thermal Switch Replacement Rotate gas control knob to the Step 1. “OFF” position. Remove outer jacket door. Step 2. Disconnect the black wire leads Step 3. from resettable thermal switch. Remove (2) ¼” hex drive screws Step 4.

  • Page 37: Screenlok ® Flame Arrestor Cleaning

    ULN Res. D Series ® ScreenLok Flame Arrestor Cleaning Step 1. Position Gas Control power switch to the “OFF” position. Step 2. Remove outer door. Step 3. Remove outer jacket door and inner door per service procedure IX on page 26. Step 4.

  • Page 38: Glossary Of Terms

    ULN Res. D Series Glossary of Terms British Thermal Units Gallons per Minute Hertz Kilowatt hour Light Emitting Diode National Pipe Thread Ohms Ohms of resistance Pounds per Square Inch Revolutions per minute Energy Cut Out Volts Alternating Current “ w.c. Inches of Water Column ºC Degrees Centigrade...
  • Page 39 ULN Res. D Series 9. Draft Diverter 17. Draft Diverter 25. Inner door gasket kit 1. Draft Diverter 18. Damper 26. Heat trap kit 10. Damper 2. Damper 11. Heat Trap Outlet 19. Heat Trap Outlet 27. ASSE mixing device 3.

This manual is also suitable for:

Urg1d40s*nUrg1d40t*nUrg1d50t*n

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