Bradford White URG1PV40S*N Service Manual
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Bradford White URG1PV40S*N Service Manual

Upv series through-the-wall gas water heaters
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Manual 238 51548 00A 4/15
UPV Series
Through-The-Wall Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
URG1PV40S*N
URG1PV50S*N
URG2PV40T*N
URG2PV50T*N
URG2PV50H*N
ULG2PV50H56*N
(*) Denotes Warranty Years
Save this manual for future reference

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Summary of Contents for Bradford White URG1PV40S*N

  • Page 1 SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: URG1PV40S*N URG1PV50S*N URG2PV40T*N URG2PV50T*N URG2PV50H*N ULG2PV50H56*N (*) Denotes Warranty Years Manual 238 51548 00A 4/15 Save this manual for future reference...

  • Page 2: Table Of Contents

    The Bradford White UPV Series Through-The-Wall Gas Water Heaters Table of Contents Page PV Service Procedure Introduction ..........................4 How to Use This Manual ......................5 Tools Required for Service ....................... 5 Specifications ..........................6 Control Timings ......................... 9 Sequence of Operation ......................10 Troubleshooting .........................
  • Page 3 UPV 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 URG1PV & URG2PV 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 ®...

  • Page 5: How To Use This Manual

    It is intended for this manual to be used by qualified service personnel for the primary purpose of troubleshooting and repair of the Bradford White UPV Series water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting the water heater.
  • Page 6 UPV 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. for Natural Gas, 14.0” W.C. maximum. Venting System Power vent through the wall or vertical through the roof.

  • Page 7: Specifications

    UPV Series Vent Tables Venting Specifications for: URG1PV40S, URG2PV40T URG1PV50S, URG2PV50T 2" Diameter (5.1 cm) Vent Connector Lengths # of Maximum Straight Minimum Straight Terminating Elbows Length ft. (m) Length ft. (m) Through the Wall 45 (13.7) 2 (.6) Through the Wall 40 (12.2) 2 (.6) Through the Wall...
  • Page 8 UPV Series Vent Tables Venting Specifications for: URG2PV50H ULG2PV50H 3" Diameter (7.6 cm) Vent Connector Lengths # of Maximum Straight Minimum Straight Terminating Elbows Length ft. (m) Length ft. (m) Through the Wall 55 (16.8) 2 (.6) Through the Wall 50 (15.2) 2 (.6) Through the Wall...

  • Page 9: Control Timings

    UPV Series Control Timings Ignition State Timing Pre-purge 15 Seconds Trial for Ignition 90 Seconds Flame Stabilization Period 3 Seconds Inter-purge 15 Seconds 1.5 Seconds (2 second maximum; 1 second Flame Failure Response Time minimum) Post-purge 15 Seconds PS Fault Delay (failed open/close) Retry after 2 minutes Soft Lockout Retry after 5 minutes...

  • Page 10: Power Up Sequence

    UPV 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. To assure no outputs are energized if the “Flammable Vapor Sensor” is out of range, the control will test the “Flammable Vapor Sensor”...
  • Page 11 UPV Series Normal Heating Sequence (cont.) 7. Steady state operation. 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.
  • Page 12 UPV Series Abnormal Operation (cont.) times, then 3 times twice with 3 second pause. The status self clears if the fault clears for at least 15 seconds. c. Water temperature in excess of ECO (energy cut out) limit -The gas control immediately turns off pilot &...
  • Page 13 UPV Series through post purge and flashes 6 times then, once with 3 second pause. The control waits 5 minutes before repeating the ignition sequence. Abnormal Operation (cont.) 5. Flame sensing fault: a. Flame lost during run-the gas control turns off pilot and main valves, runs blower for 15 seconds (inter-purge).

  • Page 14: Troubleshooting

    UPV 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 LED Status Control Status Probable Cause Procedure None, control No electrical...
  • Page 15 UPV Series Service LED Status Control Status Probable Cause Procedure 1. Unstable pilot. 2. Pilot tube blocked or restricted. Six-one flash, Failed to light pilot. 3. Oxidation build up on pilot electrode. Page 18. three second System auto resets. pause 4.

  • Page 16: Burner Inspection, Cleaning & Replacement

    UPV 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 17 UPV 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 18: Pilot Testing, Cleaning & Replacement

    UPV Series Pilot Inspection, 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. Visually inspect igniter/flame sense wire for damage.

  • Page 19: Pressure Switch Testing & Replacement

    UPV Series Pressure Switch Testing WARNING 115 volt potential exposure. Step 1. Position power switch on gas Use caution to avoid personal injury. 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).
  • Page 20 UPV Series WARNING Pressure Switch Replacement 115 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 (Phillip’s screw driver) from control access cover on blower assembly and remove cover (see photo 3).

  • Page 21: Blower Testing & Replacement

    UPV Series Blower Testing WARNING 115 volt potential exposure. Use Step 1. Position gas control caution to avoid personal injury. power switch to “ON” position and adjust control to call for heat. Step 2. Remove the three screws (Phillip’s screw driver) from control access cover on blower assembly and remove cover (see photo 7).

  • Page 22: Blower Removal

    UPV Series Blower Removal Step 1. Position gas control power switch to “OFF” position. Step 2. Unplug blower power cord from wall outlet. Step 3. Disconnect vent system from exhaust adapter on top of blower. Step 4. Remove exhaust adapter from blower (blade screw driver) and retain for use on new blower.

  • Page 23: Blower Temperature Switch Testing & Replacement

    UPV Series Blower Temperature Switch Testing Step 1. Position power switch on gas WARNING control to the “OFF” position. 115 volt potential exposure. Use Step 2. Remove the three screws (Phillip’s caution to avoid personal injury. screw driver) from control access cover on blower and remove cover (see photo 14).
  • Page 24 UPV Series Blower Temperature Switch Replacement WARNING 115 volt potential exposure. Use caution to avoid personal injury. Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet. Step 2. Remove the three screws (Phillip’s screw driver) from the control access cover on blower and remove cover (see photo 16).

  • Page 25: Gas Control Testing & Replacement

    UPV 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 26: Determine Water Temperature Inside Tank

    UPV Series ECO (Energy Cut Out) TESTING 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 27 UPV Series Gas Control Removal From Water Heater Step 1. Position gas control power switch to the “OFF” position and unplug heater from power supply. Step 2. Drain heater to a point below the gas control level. Step 3. Turn off gas supply to water heater and disconnect gas piping from gas control.

  • Page 28: Flammable Vapor Device Testing And Replacement

    UPV Series Flammable Vapor Sensor Testing Step 1. Position power switch on gas control to the “OFF” position. Step 2. Disconnect flammable vapor sensor from gas control. Step 3. Using a multi-meter set to the ohms setting, check resistance of flammable vapor sensor.

  • Page 29: Safety Circuit Voltage Trace

    UPV Series Safety Circuit Voltage Trace NOTE: This procedure assumes a cool tank. WARNING 115 volt potential exposure. Use caution to avoid personal injury. Remove three screws (Phillips screw driver) from control access cover on blower and remove cover (see photo 21).

  • Page 30: 115 Vac Circuit Trace

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

  • Page 31: Diptube Inspection & Replacement

    UPV 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 on/off switch of gas control valve to “OFF” position and unplug water heater from wall outlet.

  • Page 32: Anode Inspection & Replacement

    UPV 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. Step 1. Position on/off switch of gas control valve to the “OFF” position and unplug water heater from wall outlet.

  • Page 33: Flue Baffle Inspection & Replacement

    UPV Series Flue Baffle Inspection and Replacement Step 1. Position gas control power switch to the “OFF” position and unplug blower from wall outlet. Step 2. Disconnect vent system from exhaust adapter on top of blower. Step 3. Unplug cord sets from blower (see photo 28). Step 4.

  • Page 34: Inner Door Removal, Inspection & Replacement

    UPV 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. Disconnect main burner feedline ” wrench), pilot tube ( ” wrench) and white igniter/flame sense wire from the gas valve.
  • Page 35 UPV Series Inner Door Gasket Replacement Procedure WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. Step 10. After inspection of inner door as noted in step 9, completely remove gasket and adhesive residue from right and left side inner doors as needed.
  • Page 36 UPV Series Installation of Inner Door With Gasket (cont.) Step 5. Align right side inner door to combustion chamber and verify the fastener holes of the combustion chamber are aligned with right side inner door slotted opening. Verify seal integrity around combustion opening. Secure right side inner door using ¼”...

  • Page 37: Resettable Thermal Switch, Inspection & Replacement

    UPV 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 38 UPV 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. from the manifold mount.

  • Page 39: Screenlok ® Flame Arrestor Cleaning

    UPV Series ® ScreenLok Flame Arrestor Cleaning NOTICE Some models are not equipped with the ® ScreenLok Flame Arrestor. 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 XIII on page 34. Step 4.

  • Page 40: Glossary Of Terms

    UPV Series Frozen exhaust vent terminal If an exhaust vent terminal is blocked with ice or snow due to severe conditions, the pressure switch and control will not allow the burner to operate. This will result in a three flash status code.
  • Page 41 UPV Series 1. Blower Complete 13. Inlet Dip Tube 25. Main Burner Orifice 38. ASSE Approved Mixing 2. Air Mixing Inlet Cover 14. Wire Harness 26. FV Sensor Valve 3. Pressure Switch 15. T&P Valve 27. FV Sensor Clip 39. Kit-Heat Trap Insert 4.

This manual is also suitable for:

Urg1pv50s*nUrg2pv40t*nUrg2pv50t*nUrg2pv50h*nUlg2pv50h56*n

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