Bradford White UPV75 Series Service Manual
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Bradford White UPV75 Series Service Manual

Ultra low nox through-the-wall gas water heaters
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UPV75 Series Ultra Low NOx
Through-The-Wall Gas Water Heaters
Manual 238-53991-00A 05/22
SERVICE
SERVICE
MANUAL
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
URG2PV75H76*N19
ULG2PV75H76*N19
(*) Denotes Warranty Years
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  • Page 1 UPV75 Series Ultra Low NOx Through-The-Wall Gas Water Heaters SERVICE SERVICE MANUAL MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: URG2PV75H76*N19 ULG2PV75H76*N19 (*) Denotes Warranty Years Manual 238-53991-00A 05/22...

  • Page 2: Table Of Contents

    The Bradford White UPV75 Series Through-The-Wall Gas Water Heaters Table of Contents Page UPV75 Service Procedure Introduction ......................4 How to Use This Manual ..................5 Tools Required for Service ..................5 Specifications ......................6 Control Timings ......................8 Sequence of Operation ..................9 Troubleshooting ......................12 Burner Operation Inspection, Cleaning &...
  • Page 3 UPV75 Series WARNING: If the information in these instructions is DANGER not followed exactly, a fire or explosion may result DO NOT store or use gasoline or other causing property damage, personal injury, or death. flammable, combustible, or corrosive vapors...

  • Page 4: Introduction

    Introduction The new Bradford White URG2PV75H and ULG2PV75H 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 Bradford White Defender Safety System ®...

  • Page 5: How To Use This Manual

    In some difficult to diagnose conditions, it may be necessary to isolate the heater from the vent system to determine the problem. Contact the Bradford White technical support group immediately if diagnosis cannot be made using the methods described in this service manual.

  • Page 6: Specifications

    UPV75 Series Specifications Power Supply Dedicated 115 VAC, 60 Hz, 15A. Minimum 1/2” NPT (schedule 40 black iron pipe recommended). Gas Supply Pipe Approved Gas Type Natural Gas, unit must match gas type supplied. 6.0” W.C. min. for Natural Gas, 14.0” W.C. maximum.
  • Page 7 UPV75 Series Vent Tables Venting Specifications for: URG2PV75H*N19, ULG2PV75H*N19 VENT CONNECTOR LENGTHS FOR 3 in (7.6 cm) DIAMETER VENT PIPE # of Minimum Maximum Elbows Straight Straight Terminating Length Length (excl. vent terminals) ft (m) ft (m) Installation elevation above...

  • Page 8: Control Timings

    UPV75 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)
  • Page 9 UPV75 Series - Sequence of Operations 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. Simulative Resistive Device: To assure no outputs are energized if the “Simulated Resistive Device”...
  • Page 10 UPV75 Series - Sequence of Operations Abnormal Operation 1. Simulated Resistive Device Fault: a. If the resistance is greater than 70,000 Ohms – The gas control immediately turns off all outputs. Control waits and monitors resistance for 30 seconds. If the resistance is greater than 65,000 ohms after 30 seconds, the gas control proceeds to verify resistive delay for 2 minutes and flashes 7 times then once with a three second pause.
  • Page 11 Abnormal Operation cont.- 4. Trial for Ignition Fault: a. Pressure switch opens during trial – The gas control turns off igniter and pilot valve. The gas control proceeds as described in 3b above. If the pressure switch closes within 30 seconds the gas control will continue with trial for ignition starting at blower pre-purge.

  • Page 12: Troubleshooting

    UPV75 Series - Troubleshooting 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. LED Status Control Status...
  • Page 13 LED Status Control Status Probable Cause Service Procedure 1. Unstable pilot. Six-one flash, 2. Pilot tube blocked or restricted. Failed to light pilot. three second 3. Oxidation build up on pilot electrode. Page 16. System auto resets. pause 4. Wire damage to pilot assembly or bad connection at gas valve.

  • Page 14: Burner Operation Inspection, Cleaning & Replacement

    UPV75 Service Procedure I – Burner Operation Inspection, Cleaning, and Replacement 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.
  • Page 15 UPV75 Service Procedure I – Burner Operation Inspection, Cleaning, and Replacement 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 16: Pilot Inspection, Testing & Replacement

    UPV75 Service Procedure II – Pilot Inspection, Testing, and Replacement Pilot Inspection, Testing, and Replacement 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.
  • Page 17 UPV75 Service Procedure II – Pilot Inspection, Testing, and Replacement Pilot Inspection, Testing, and Replacement cont. Step 13. Visually inspect the igniter/flame sense electrode for oxidation build up. Carefully clean any oxidation using very fine emery cloth. Step 14. Remove the pilot assembly from the burner assembly (¼”...

  • Page 18: Pressure Switch Testing & Replacement

    UPV75 Service Procedure III – Pressure Switch Testing and Replacement WARNING Pressure Switch Testing 115 volt potential exposure. Step 1. Position power switch on gas control to the Use caution to avoid personal injury. “OFF” position. Step 2. Remove the three screws (T20 Torx driver) from control access cover on blower assembly and remove cover (see photo 1).
  • Page 19 UPV75 Service Procedure III – Pressure Switch Testing and Replacement Pressure Switch Replacement WARNING 115 volt potential exposure. Step 1. Position gas control power switch to “OFF” Use caution to avoid personal injury. position. Step 2. Remove the three screws (T20 Torx driver) from control access cover on blower assembly and remove cover (see photo 3).

  • Page 20: Blower Testing & Replacement

    UPV75 Service Procedure IV – Blower Testing and Replacement WARNING Blower Testing 115 volt potential exposure. Use caution to avoid personal injury. Step 1. Position gas control power switch to “ON” position and adjust control to call for heat. Step 2. Remove the three screws (T20 Torx driver) from control access cover on blower assembly and remove cover (see photo 7).
  • Page 21 UPV75 Service Procedure IV – Blower Testing and Replacement Blower Removal Position gas control power switch to “OFF” position. Step 1. Step 2. Unplug blower power cord from wall outlet. Step 3. Disconnect vent system from exhaust adapter on top of blower. Step 4.

  • Page 22: Replacement Wire Harness Installation

    UPV75 Service Procedure V – Replacement Wire Harness Installation External Wire Harness Installation 1. Remove the blower assembly from the heater according to the steps outlined in Blower Removal, page 21. 2. On the back of the blower assembly, using a ¾” bit, drill a hole through exterior molded wall. Be very careful not to drill through the interior molded wall.
  • Page 23 External Wire Harness Installation continued- 6. Install the blower assembly according to the steps outlined in Blower Removal, page 21.

  • Page 24: Blower Temperature Switch Testing & Replacement

    UPV75 Service Procedure VI – Blower Temperature Switch Testing and Replacement Blower Temperature Switch Testing WARNING 115 volt potential exposure. Step 1. Position power switch on gas control to Use caution to avoid personal injury. the “OFF” position. Step 2. Remove the three screws (T20 Torx driver) from control access cover on blower and remove cover (see photo 14).
  • Page 25 UPV75 Service Procedure VI – Blower Temperature Switch Testing and Replacement WARNING Blower Temperature Switch Replacement 115 volt potential exposure. Step 1. Position gas control power switch to the “OFF” Use caution to avoid personal injury. position and unplug heater from wall outlet. Step 2.

  • Page 26: Gas Control Testing & Replacement

    UPV75 Service Procedure VII – Gas Control Testing and Replacement 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 27 UPV75 Service Procedure VII – Gas Control Testing and Replacement ECO (Energy Cut Out) Testing WARNING 115 volt potential exposure. The Honeywell gas control is designed with an Use caution to avoid personal injury. 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 28 UPV75 Service Procedure VII – Gas Control Testing and Replacement WARNING Gas Control Removal from Water Heater 115 volt potential exposure. Step 1. Position the gas control power switch to the Use caution to avoid personal injury. “OFF” position and unplug the water heater from power supply.

  • Page 29: Simulative Resistance Device Testing

    UPV75 Service Procedure VIII – Simulative Resistance Device Testing Simulative Resistance Device Testing WARNING DO NOT use a standard multi-meter Step 1. Position power switch on gas control probe for this test. Doing so will to the “OFF” position. damage connector. Use special pin type electronic probes or small diameter Step 2.

  • Page 30: Safety Circuit Voltage Trace

    UPV75 Service Procedure IX – Safety Circuit Voltage Trace WARNING Safety Circuit Voltage Trace 115 volt potential exposure. Use caution to avoid personal injury. NOTE: This procedure assumes a cool tank. Remove three screws (T20 Torx screwdriver) from control access cover on blower and remove cover (see photo 20). Position gas control switch on the “ON”...

  • Page 31: 115 Vac Circuit Trace

    UPV75 Service Procedure X – 115 VAC Circuit Trace WARNING 115 VAC Circuit Trace 115 volt potential exposure. Step 1. Verify 115 VAC and proper Use caution to avoid personal injury. polarity at wall outlet. Step 2. With the unit plugged in and control power switch in the “ON” position, verify LED status. LED status LED status LED status...

  • Page 32: Diptube Inspection & Replacement

    UPV75 Service Procedure XI – Diptube Inspection and Replacement Diptube Inspection and 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 33: Anode Inspection & Replacement

    UPV75 Service Procedure XII – Anode Inspection and Replacement Anode Inspection and 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 34: Flue Baffle Inspection & Replacement

    UPV75 Service Procedure XIII – Flue Baffle Inspection and Replacement Flue Baffle Inspection and Replacement Disconnect vent system from blower Step 1. Position gas control power switch to the “OFF” position and unplug blower from wall outlet. Step 2. Disconnect vent system the top of blower.

  • Page 35: Inner Door/Gasket Removal, Inspection & Replacement

    UPV75 Service Procedure XIV – Inner Door/Gasket Removal, Inspection, and Replacement Inner Door Removal Procedure Step 1. Position the gas control power switch to the “OFF” position. Step 2. Remove the outer jacket burner access door. Step 3. Disconnect the main burner feedline (3/4”...
  • Page 36 UPV75 Service Procedure XIV – Inner Door/Gasket Removal, Inspection, and Replacement 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 1.
  • Page 37 UPV75 Service Procedure XIV – Inner Door/Gasket Removal, Inspection, and Replacement Inner Door Gasket Replacement Procedure cont. Step 6. Replace the outer jacket burner access door. Step 7. To resume operation, follow the instructions located on the lighting instruction label or the lighting instructions located in the Installation and Operation Manual.

  • Page 38: Glossary Of Terms

    UPV75 Series – Glossary of Terms 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. Once the blockage is removed (through melting or other means) the controls will let the burner operate.
  • Page 39 UPV75 Series - Parts List and Diagram Part List 28. Kit – Condensate 1. Blower Complete Air 10. Cold Water Diptube 19. Screw #8-15 x ¾ Blower (inlet) Hose 29. ASSE Approved 2. Pressure Switch 11. Wire Harness 20. Screw #10-12 x ¾...
  • Page 40 905-636-0666 Warranty bwccwarranty@bradfordwhite.com Technical Support bwcctech@bradfordwhite.com Service Parts orders@bradfordwhitecanada.com Orders ca.orders@bradfordwhite.com For U.S. and Canada field service, contact your professional installer or local Bradford White sales representative. International General Contact international@bradfordwhite.com www.bradfordwhite.com ©2022, Bradford White Corporation, USA. All rights reserved.

This manual is also suitable for:

Urg2pv75h76 n19 seriesUlg2pv75h76 n19 series

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