Bradford White UPV75 Series User manual

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Manual 238-53991-00A 05/22
SERVICE
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
UPV75 Series Ultra Low NOx
Through-The-Wall Gas Water Heaters
SERVICE
MANUAL

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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 & Replacement.......................................14 I
Pilot Inspection, Testing & Replacement...............................................................16 II
Pressure Switch Testing & Replacement..............................................................18 III
Blower Testing & Replacement .............................................................................20 IV
Replacement Wire Harness Installation ................................................................22 V
Blower Temperature Switch Testing & Replacement...........................................24 VI
Gas Control Testing & Replacement.....................................................................26 VII
Simulative Resistance Device Testing ..................................................................29 VIII
Safety Circuit Voltage Trace ..................................................................................30 IX
115 VAC Circuit Trace ...........................................................................................31 X
Diptube Inspection & Replacement .......................................................................32 XI
Anode Inspection & Replacement.........................................................................33 XII
Flue Baffle Inspection & Replacement ..................................................................34 XIII
Inner Door/Gasket Removal, Inspection & Replacement.....................................35 XIV
Glossary of Terms..................................................................................................38 ---
Parts List and Diagram...........................................................................................39 ---
Notes.......................................................................................................................40 ---
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UPV75 Series
WARNING
Water heaters are heat producing appliances. To avoid
damage or injury, do not store materials against the water
heater or vent- air intake system. Use proper care to avoid
unnecessary contact (especially by children) with the water
heater and vent-air intake components. UNDER NO
CIRCUMSTANCES MUST FLAMMABLE MATERIALS,
SUCH AS GASOLINE OR PAINT THINNER BE USED OR
STORED IN THE VICINITY OF THIS WATER HEATER,
VENT-AIR INTAKE SYSTEM OR IN ANY LOCATION
FROM WHICH FUMES COULD REACH THE WATER
HEATER OR VENT-AIR INTAKE SYSTEM
WARNING
If sweat fittings are to be used DO NOT apply heat to the
nipples on top of the water heater. Sweat the tubing to the
adapter before fitting the adapter to the water connections. It
is imperative that heat is not applied to the nipples containing
a plastic liner.
WARNING
Hydrogen gas can be produced in an operating water heater
that has not had water drawn from the tank for a long period
of time (generally two weeks or more). Hydrogen gas is
extremely flammable. To prevent the possibility of injury
under these conditions, we recommend the hot water faucet
to be open for several minutes at the kitchen sink before you
use any electrical appliance which is connected to the hot
water system. If hydrogen is present, there will be an unusual
sound such as air escaping through the pipes as hot water
begins to flow. DO NOT smoke or have open flame near the
faucet at the time it is open.
WARNING
DO NOT ATTEMPT TO LIGHT ANY GAS
APPLIANCE IF YOU ARE NOT CERTAIN OF
THE FOLLOWING:
• Liquefied petroleum gases/propane gas and
natural gas have an odorant added by the gas
supplier that aids in the detection of the gas.
• Most people recognize this odor as a “sulfur” or
“rotten egg” smell.
• Other conditions, such as “odorant fade” can
cause the odorant to diminish in intensity, or
“fade”, and not be as readily detectable.
• If you have a diminished sense of smell or are in
any way unsure of the presence of gas,
immediately contact your gas supplier from a
neighbor’s telephone.
Gas detectors are available. Contact your gas
supplier, or plumbing professional, for more
information.
WARNING
FAILURE TO INSTALL AND MAINTAIN A NEW,
LISTED ¾” X ¾” TEMPERATURE AND
PRESSURE RELIEF VALVE WILL RELEASE THE
MANUFACTURER FROM ANY CLAIM THAT
MIGHT RESULT FROM EXCESSIVE
TEMPERATURE AND PRESSURES.
WARNING
Turn OFF or disconnect the electrical power supply
to the water heater before servicing. Label all wires
prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
DANGER
DO NOT store or use gasoline or other
flammable, combustible, or corrosive vapors
and liquids in the vicinity of this or any other
appliance.
IMPORTANT
Before proceeding, please inspect the
water heater and its components for
possible damage. DO NOT install any
water heater with damaged components.
If damage is evident then please contact
the supplier where the water heater was
purchased, or the manufacturer listed on
the rating plate for replacement parts.
WHAT TO DO IF YOU SMELL GAS!
•DO NOT try to light any appliance.
•DO NOT touch any electrical switch; DO NOT use
any phone in your building.
•Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
•If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
WARNING: If the information in these instructions is
not followed exactly, a fire or explosion may result
causing property damage, personal injury, or death.
FOR YOUR SAFETY
DO NOT store or use gasoline or other flammable,
combustible, or corrosive vapors and liquids in the vicinity
of this or any other appliance.
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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®(not available on all models).
Spark to Pilot Ignition System - Employing the spark to pilot ignition system promotes reliable and
consistent pilot and main burner ignitions to provide hot water on demand.
Integrated Immersion Thermostat/Gas Control Valve with LED - Developed for ease of
troubleshooting by providing simple diagnostic codes to pinpoint an installation or component
performance issue.
Powerful Blower - Will eliminate problems with difficult venting situations.
Quieter and Cooler Blower Operation - Blower noise is significantly reduced for both interior and
exterior environments. Cooler operation increases blower life by reducing bearing wear and noise.
Rugged Wiring Connections - Receptacle type connections promote error free wiring.
Increased Vent Lengths - Increased venting performance is achieved while maintaining Energy
Factor & FHR (not applicable on all models) performance.
The URG2PV75H and ULG2PV75H water heater uses a combustion system where flue gases are
combined with dilution air to reduce the flue gas temperature in the blower. The diluted flue gases
are evacuated to the exterior through low temperature vent materials. The gas control maintains
water temperature, ignition sequence and regulates gas flow. A safety circuit consisting of a pressure
switch and blower temperature switch verifies proper conditions exist for safe and reliable operation.
If a situation outside of normal operating parameters exists, the gas control diagnostic LED will flash a
code to positively identify an operational issue.
This service manual is designed to facilitate problem diagnosis and enhance service efficiency.
Please read the service manual completely before attempting service on this new series of power
vent models.
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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.
The Honeywell WV4462A Electronic Gas Control will display status codes in the event of abnormal
operation. Status codes are listed in the troubleshooting chart beginning on page 12 of this service
manual. The troubleshooting chart will also indicate the probable cause for the status code and direct
the service professional to a service procedure to properly diagnose the abnormal operation.
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.
Tools Required for Service
Manometer: A liquid “U” tube type or a digital (magnahelic) type can be used. This device is used to
measure gas and/or air pressure and vacuum.
Multi-Meter: A digital type is strongly recommended. This device is used to measure electrical
values. The meter you select must have the capability to measure volts AC, volts DC, Amps, micro-
amps and ohms.
Electronic Probes: In some cases, standard multi-meter probes will damage or simply not be
effective to obtain certain voltage and ohm readings. It will be necessary to have special electronic
“pin” type multi-meter probes. These probes are available at most electronic wholesale outlets.
Thermometer: Used to measure water temperature. An accurate thermometer is recommended.
Water Pressure Gauge: Used to measure water supply pressure. Also used to determine tank
pressure by adapting to the drain valve of the heater.
Various Hand Tools: Pipe wrench, channel locks, open end wrenches (3/8”, 7/16”, 1/2”), 12”
crescent wrench, Allen wrench set, screwdrivers (common & Phillips & T20 Torx), 1/4” nut driver,
pliers (common & needle nose), socket set, side cutters, wire cutters, wire strippers, wire crimpers,
torpedo level, small shop vac, step ladder, flashlight and 5 gallon pail.
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