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Ultra Low NOx Through-The-Wall
(TTW
) Gas Water Heaters - 19 Models
®
Manual 238-53837-00B REV 04/22
UPV Series
SERVICE
MANUAL
and Instructions for Service
Troubleshooting Guide
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
URG1PV40S*N19
URG1PV50S*N19
URG2PV40T*N19
URG2PV50T*N19
URG2PV50H*N19
ULG2PV50H*N19
* Denotes Warranty Year
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Table of Contents
Related Manuals for Bradford White UPV Series
Summary of Contents for Bradford White UPV Series
- Page 1 UPV Series Ultra Low NOx Through-The-Wall (TTW ) Gas Water Heaters - 19 Models ® SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: URG1PV40S*N19 URG1PV50S*N19 URG2PV40T*N19 URG2PV50T*N19...
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Page 2: Table Of Contents
Table of Contents Page Introduction………………………………………………………………………..4 Tools Required for Service………………………………………………………… 5 Specifications……………………………………………………………………..6 Control Timings…………………………………………………………………….. 9 Sequence of Operation……………………………………………………………. 10 Troubleshooting……………………………………………………………………. 12 Burner Inspection, Cleaning, & Replacement…………………………………… 14 Pilot Inspection, Testing, and Replacement ……………………………………. 16 Pressure Switch Testing & Replacement………………………………………… 17 Blower Testing &... - Page 3 UPV Series WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result DANGER causing property damage, personal injury, or death. DO NOT store or use gasoline or other flammable, combustible, or corrosive vapors...
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Page 4: Introduction
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 Bradford White Defender Safety System ®... -
Page 5: Tools Required For Service
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: Specifications
Specifications 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 Approved Vent... - Page 7 Vent Tables Venting Specifications for: URG1PV40S, URG2PV40T URG1PV50S, URG2PV50T TABLE 1 - VENT CONNECTOR LENGTHS FOR 2 in (5.1 cm) DIAMETER VENT PIPE # of Minimum Maximum Elbows Straight Straight Terminating (excl. vent Length Length terminals) ft (m) ft (m) Elevation of installation 0-10100 0-2000...
- Page 8 Vent Tables Venting Specifications for: URG2PV50H, ULG2PV50H TABLE 4 - VENT CONNECTOR LENGTHS FOR 3 in (7.6 cm) DIAMETER VENT PIPE # of Minimum Maximum Elbows Straight Straight Terminating (excl. vent Length Length terminals) ft (m) ft (m) Installation elevation above 0-10100 0-2000 2001-5400...
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Page 9: Control Timings
Control Timings Ignition State Timing Pre-purge 15 seconds Trial 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 ECO Limit Lockout... -
Page 10: Sequence Of Operation
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. 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 Abnormal Operation 1. Flammable Vapor Sensor or 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.
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Page 12: Troubleshooting
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 Probable Cause Service Procedure None, control Control power switch in “OFF”... - 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.
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Page 14: Burner Inspection, Cleaning, & Replacement
UPV 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 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. Step 11.
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Page 16: Pilot Inspection, Testing, And Replacement
UPV Service Procedure II – Pilot Inspection, Testing, and Replacement 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”... -
Page 17: Pressure Switch Testing & Replacement
UPV 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 18 UPV 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).
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Page 19: Blower Testing & Replacement
UPV 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 20 UPV Service Procedure IV – Blower Testing and Replacement 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.
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Page 21: Replacement Wire Harness Installation
UPV Service Procedure V – Replacement Wire Harness Installation Replacement Wire Harness Installation 1. Remove the blower assembly from the heater according to the steps outlined in Blower Removal. 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 22 External Wire Harness Installation continued- 6. Install the blower assembly according to the steps outlined in Blower Removal.
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Page 23: Blower Temperature Switch Testing & Replacement
UPV Service Procedure VI – Blower Temperature Switch Testing and Replacement WARNING Blower Temperature Switch Testing 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 24 UPV 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.
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Page 25: Gas Control Testing & Replacement
UPV 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 26 UPV Service Procedure VII – Gas Control Testing and Replacement ECO (Energy Cut Out) Testing WARNING 115 volt potential exposure. The Resideo gas control is designed with an ECO Use caution to avoid personal injury. 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 Service Procedure VII – Gas Control Testing and Replacement WARNING Gas Control Removal from Water Heater 115 volt potential exposure. Step 1. Position gas control power switch to the “OFF” Use caution to avoid personal injury. position and unplug the water heater from power supply.
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Page 28: Flammable Vapor / Simulative Resistance Device Testing & Replacement
UPV Service Procedure VIII – Flammable Vapor/Simulative Resistance Device Testing WARNING Flammable Vapor Sensor Testing 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. -
Page 29: Safety Circuit Voltage Trace
UPV 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 30: 115 Vac Circuit Trace
UPV Service Procedure X – 115 VAC Circuit Trace 115 VAC Circuit Trace WARNING 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 31: Diptube Inspection & Replacement
UPV 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 on/off switch of gas control valve to “OFF” position and unplug water heater from wall outlet. -
Page 32: Anode Inspection & Replacement
UPV 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 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 Service Procedure XIII – Diptube 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 34: Inner Door Removal, Inspection & Replacement
UPV Service Procedure XIV – Inner Door/Gasket Removal, Inspection, and Replacement 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 (3/4” wrench), pilot tube (7/16”... - Page 35 UPV 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 36 UPV Service Procedure XIV – Inner Door/Gasket Removal, Inspection, and Replacement Inner Door Gasket Replacement Procedure 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.
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Page 37: Resettable Thermal Switch Inspection & Replacement
UPV Service Procedure XV – Resettable Thermal Switch Testing and Replacement Resettable Thermal Switch Continuity Testing Step 1. Remove outer jacket door. Step 2. Disconnect black wire leads from the resettable thermal switch. Step 3. Using a multimeter capable of measuring 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... - Page 38 UPV Service Procedure XV – Resettable Thermal Switch Testing and Replacement Resettable Thermal Switch Replacement Step 1. Rotate the gas control knob to the “OFF” position. Step 2. Remove the outer jacket door. Step 3. Disconnect the black wire leads from the resettable thermal switch.
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Page 39: Screenlok ® Flame Arrestor Cleaning
UPV Series - ScreenLok ® ScreenLok Flame Arrestor Cleaning ® NOTICE Some models are not equipped with the ScreenLok® Flame Arrestor. Step 1. Position the gas control power switch to the “OFF” position. Remove outer door. Step 2. Remove the outer jacket door and inner door per Service Procedure XIV. Disconnect main burner feedline (¾”... -
Page 40: Parts List
UPV Series - Parts List and Diagram Part List 11. Cold Water Diptube 21. Vapor Sensor 1. Blower Complete 30. Burner (inlet) Harness 2. Power Cord 12. Blower Harness 22. 2” Exhaust Adapter 31. Screw #6-20 x 3/8 3. Gasket Adapter 13. - Page 44 905-636-0666 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.