Bradford White High EF RG2F40S Series User manual

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Manual 238-51617-00B
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
RG2F40S*(N,X)
RG2F50S*(N,X)
(*) Denotes Warranty Years
Atmospheric Vent Gas Water Heater
High EF

Page 2
Table of Contents
Section Page
Introduction ______________________________________________ 5
How to Use this Manual _____________________________________ 6
Tools Required for Service___________________________________ 6
Specifications_____________________________________________ 7
Sequence of Operation _____________________________________ 9
Power Up Sequence
Normal Heating Sequence
Abnormal Operation
Troubleshooting __________________________________________ 13
Burner Maintenance_______________________________________ 15
Burner Inspection
Burner Cleaning Procedure
Pilot Maintenance_________________________________________ 17
Pilot Inspection, Testing and Replacement
Blower Replacement ______________________________________ 19
Gas Control Testing & Replacement __________________________ 21
Determine Temperature Inside Tank _____________________ 21
Gas Control Removal _________________________________ 22
Flammable Vapor Sensor Testing ____________________________ 23
120 VAC Circuit Trace _____________________________________ 23
Diptube Inspection _______________________________________ 24
Anode Inspection_________________________________________ 25
Blower Removal__________________________________________ 25
Inner Door Removal ______________________________________ 28
Inner Door Gasket Replacement _____________________________ 30
Inner Door Installation ____________________________________ 31
Pressure Switch Testing & Replacement _______________________ 32
Arrestor Cleaning_________________________________________ 34
Common Terms __________________________________________ 35
Parts List _______________________________________________ 36
Notes __________________________________________________ 37
2

WARNING
If the information in these instructions is not followed exactly, a fire or explosion may
result causing property damage, personal injury, or death.
What to do if you smell gas:
x Do not try to light any appliance
x Do not touch any electrical switch; do not use any phone in your building
x Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.
x 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.
CAUTION
Incorrect operation of this water heater may create a hazard to life and property and will
nullify the warranty.
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
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.
NOTICE
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
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WARNING
Water heaters are heat producing appliances. To avoid damage or injury, do not store
materials against the water heater or any of its components. Use proper care to avoid
unnecessary contact, especially by children, with the water heater and its components.
Under no circumstances must flammable materials, such as gasoline or paint thinner be
used or stored in the vicinity of this water heater or in any location in which the fumes
could reach the water heater.
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 a 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.
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.
FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED 3/4” X 3/4” TEMPERATURE AND
PRESSURE RELIEF VALVE WILL RELEASE THE MANUFACTURER FROM ANY CLAIM THAT
MIGHT RESULT FROM EXCESSIVE TEMPERATURE AND PRESSURES.
4

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How to Use this Manual
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Specifications
7

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Ignition State Timing
Pre-purge 15 seconds
Trial for Ignition 90 seconds
Flame Stabilization Period 3 seconds
Interpurge 15 seconds
Flame Failure Response Time 1.5 seconds (2 second maximum; 1 second mini-
mum)
Postpurge 15 seconds
Pressure Switch Fault Delay (failed open/close) Retry after 2 minutes
Soft Lockout Retry after 5 minutes
ECO Limit Lockout Indefinite (See page 21 to reset)
Verify Resistive Delay Retry after 2 minutes (repeats 5 times)
Simulated Resistive Load Lockout Indefinite (cycle power to reset)
Hardware Status Lockout Indefinite (self clears if fault clears for at least 15
seconds)
Specifications
Wiring Diagram
Control Timings
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Sequence of Operation
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Page 10
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Sequence of Operation
10