Bradford White RG1D30T*(N, X), RG1D40S*(N, RG1D40T*(N, RG1D50T*(N Service Manual

Residential D Series

Gas Water Heaters

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

RG1D30T*(N,X)
RG1D40S*(N,X)
RG1D40T*(N,X)
RG1D50T*(N,X)
RG2D40S*(N,X)
RG2D50S*(N,X)
(*) Denotes Warranty Years

Manual 238‐51637‐00A 10/15

Save this manual for future reference

The Bradford White

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2


Residential D Series

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Gas Water Heaters

Table of Contents

Page D Service Procedure

Introduction ................................................................................................................................ 4 ---

How to Use This Manual .......................................................................................................... 5 ---

Tools Required for Service ....................................................................................................... 5 ---

Specifications ............................................................................................................................. 6 ---

Control Timings ......................................................................................................................... 7 ---

Sequence of Operation .............................................................................................................. 8 ---

Troubleshooting ......................................................................................................................... 11 ---

Burner Inspection, Cleaning & Replacement ......................................................................... 13 D-I

Pilot Testing, Cleaning & Replacement .................................................................................. 15 D-II

Damper Removal & Installation .............................................................................................. 16 D-III

Gas Control Testing & Replacement ....................................................................................... 17 D-IV

Flammable Vapor Device Testing and Replacement ............................................................. 20 D-V

Diptube Inspection & Replacement ......................................................................................... 21 D-VI

Anode Inspection & Replacement ........................................................................................... 22 D-VII

Flue Baffle Inspection & Replacement .................................................................................... 23 D-VIII

Inner Door Removal, Inspection & Replacement .................................................................. 25 D-IX

115 VAC Circuit Trace ............................................................................................................. 28 D-X

Damper Relay Installation ........................................................................................................ 29 D-XI

Resettable Thermal Switch, Inspection & Replacement ........................................................ 32 D-XII

ScreenLok

®

Flame Arrestor Cleaning ..................................................................................... 34 ---

Glossary of Terms ..................................................................................................................... 35 ---

Parts List ..................................................................................................................................... 36 ---

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WARNING:

If the information in these
instructions is not followed exactly, a fire or
explosion may result causing property damage,
personal injury, or death.

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!

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.



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.

WARNING

DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE
NOT CERTAIN OF THE FOLLOWING:

x Liquefied petroleum gases/propane gas and natural gas

have an odorant added by the gas supplier that aids in the
detection of the gas.

x Most people recognize this odor as a “sulfur” or “rotten egg”

smell.

x Other conditions, such as “odorant fade” can cause the

odorant to diminish in intensity, or “fade”, and not be as
readily detectable.

x 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.

CAUTION

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.

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

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.

CAUTION

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.

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Introduction

The new Bradford White Residential Flue Damper 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 quiet operation, and the Bradford White
Defender Safety System.

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 Thermal Well/Gas Control with LED – was developed for ease of troubleshooting
by providing simple diagnostic codes to pinpoint an installation or component performance issue.

Rugged Wiring Connections – receptacle type connections promote error free wiring.

The gas control maintains water temperature, ignition sequence, and regulates gas flow. If a situation
outside of the normal operating parameters exists, the gas control diagnostic LED will flash a code to
positively identify an operational issue.

Please read the service manual completely before attempting service on this new series of damper models.

How the Safety System Works

During normal operation, air for combustion is drawn into the water heater through the openings in the
jacket. This air travels down and around the combustion chamber and enters through holes in the very
bottom of the corrosion resistant combustion chamber. The air then travels up through the flame arrestor
louvers, where the velocity of the air is increased and its direction altered. The air then mixes in a normal
manner with supplied gas and is efficiently combusted, producing low NO

x

emissions.

In the unlikely event trace amounts of flammable vapors are present in the air flowing into the combustion
chamber, the vapors are harmlessly ignited by the burner. If flammable vapors are sufficient quantity to
prevent normal combustion, the flammable vapor sensor recognizes this and shuts down the pilot and main
burner. Should the flammable vapors continue to burn, the flame arrestor prevents the flames from traveling
backwards and igniting the vapors outside of the combustion chamber. And, the resettable thermal switch
also will open and shut down the pilot and main burner.

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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 D Series water heaters. Understanding the sequence of
operation section of this manual will contribute greatly to troubleshooting the water heater.

The Honeywell WV4462 electronic gas control will display status codes in the event of abnormal operation.
Status codes are listed in the troubleshooting chart beginning on page 11 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.

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:

Multi-Meter:

Electronic Probes:

Thermometer:

Water Pressure Gage:

Various Hand Tools:

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.

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.

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.

Used to measure water temperature. An accurate thermometer is
recommended.

Used to measure water supply pressure. Also used to determine tank
pressure by adapting to the drain valve of the heater.

Pipe wrench, channel locks, open end wrenches (3/8”, 7/16”, 1/2”), 12”
crescent wrench, allen wrench set, screw drivers (common & Phillip’s), 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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Power supply Dedicated 115 VAC, 60 Hz, 15A
Gas Supply Pipe Minimum 1/2” NPT (schedule 40 black iron pipe recommended)
Approved Gas
Type

Natural Gas or Propane, unit must match gas type supplied

Gas Pressure

5.0” w.c. min. for Natural Gas, 11.0” w.c. min. for Propane, 14.0” w.c. maximum

(Natural Gas & Propane)
Venting System Single or Double Wall Metal Vent Pipe
Minimum
Clearance for
Servicing

18” from top, 24” from front, 4” sides and rear

Water Supply
Pressure

150 PSI maximum allowable working pressure. Check local codes for supply

pressure
Gas Control
ECO Limit

Residential 188°F (87°C)

Temperature
Setpoint Range

60°F (16°C) to 160°F (71°C) (approximate temperatures)

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Control Timings

Ignition State Timing

Adjust Damper Position and Verify (Open
Position)

15 Seconds

Trial for Ignition 90 Seconds
Flame Stabilization Period

3 Seconds

Re-adjust Damper Position and Verify

15 Seconds

Flame Failure Response Time 1.5 Seconds (2 second maximum; 1 second minimum.)
Adjust Damper Position and Verify (Closed
Position)

15 Seconds

Damper Blade Position Fault (failed open/close) Retry after 2 minutes
Soft Lockout Retry after 5 minutes
ECO Limit Lockout Indefinite (see page 27)
Verify Resistive Delay Retry after 2 minutes (repeats 5 times)
Simulated Resistive Load Lockout Indefinite (cycle power to restart)

Hardware Status Lockout

Indefinite (self clears if fault clears for at least 15
seconds)

Wiring Diagram

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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.
The gas control verifies that the Flammable Vapor Sensor is in the proper operating
range prior to energizing any components. If the sensor is within the proper range,
the gas control resumes normal operation. If the Flammable Vapor Sensor is out of
range, the gas control LED immediately flashes 7 times with a 3 second pause.

Normal Heating Sequence

When the phrase “Damper Open” is used, this means that the damper blade is in
the vertical position (open). Alternatively, “Damper Closed” means that the damper
blade is in the horizontal position (closed). This must not be confused with the
phrase “Damper Circuit Open,” as this means that the damper blade is in the
horizontal position. “Damper Circuit Closed” means that the damper blade is in the
vertical position, and the water heater can proceed to an ignition trial.

1. Thermostat calls for heat.
Prior to energizing damper, gas control verifies the damper safety circuit to ensure it
is in the correct state. If the safety circuit is closed, the gas control LED flashes 2
times with a 3 second pause. The gas control waits 2 minutes. Then, the damper
is powered closed. This cycle repeats until the safety circuit opens.

2. Damper Powered Open.

3. Damper Safety Circuit Check:
If the damper safety circuit does not close within 30 seconds, the gas control LED
flashes 3 times with 3 second pause. The damper is powered open for a maximum
of 30 seconds every 2 minutes trying to close the damper safety circuit. This cycle
repeats as long as there is a call for heat.

4. Damper hold period (15 seconds).

5. Trial for pilot ignition (90 seconds): The gas control lights the pilot by activating the
spark igniter and gas flow to the pilot burner. If flame is not sensed within 90
seconds, the spark igniter and gas flow are deactivated. The damper will remain
open, and the gas control LED flashes 6 times with a 3 second pause.

6. Main burner ignition: After the pilot flame is sensed, the gas control activates the
main valve for main burner ignition. The gas control will ignore flame signals for 3
seconds to allow for the main burner to stabilize

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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 damper is powered closed. The gas control LED flashes a
short flash once every 4 seconds (idle) status code.

Damper Position-if the damper position is altered during a call for heat, the pilot
and main valves are shutdown. The damper is powered open attempting to close
the damper safety circuit. The gas control LED flashes 3 times with a 3 second
pause.

Flame sensor-if flame is lost, pilot & main valves are shut down. The damper is
powered open. The gas control attempts to re-light the pilot 4 times. If
unsuccessful, the damper is closed, and the gas control proceeds to a 5 minute
lockout. The gas control re-attempts to light the pilot starting at normal heating
sequence #2.

8. Thermostat satisfies. (Gas Control LED flashing once every 4 seconds).

9. Burner off.

10. Damper Powered Closed (15 seconds).

Abnormal Operation

1. Flammable Vapor Sensor Fault:

a. If the resistance is greater than 70,000 Ohms-the gas control immediately

turns off all outputs. The gas 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 1 time with a three second pause. This process is repeated 5
times until the control either returns to normal operation or proceeds to
flammable vapor lockout.

b. If the resistance is below 3000 Ohms-The gas control immediately turns

off all outputs and proceeds to flash 8 times, then 1 time with a three second
pause. The status self clears if the resistance returns to normal range for at
least 15 seconds.

2. Temperature Sensor Fault:

a. Temperature sensor open circuit–The gas control immediately turns off all

outputs and proceeds to flash 8 times then, 3 times with 3 second pause.
The status self clears if the fault clears for at least 15 seconds.

b. Thermal well sensor not reading the same temperature within ±5.5°F –

The gas control immediately turns off all outputs and proceeds to flash 8

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Abnormal Operation (cont.)

times, then 3 times twice with 3 second pauses. The status self clears if the
fault clears for at least 15 seconds.

c. Water temperature in excess of ECO (energy cut off) limit -The gas

control immediately turns off pilot & main valves and proceeds to flash 4
times with a 3 second pause. To reset the gas control, rotate the setpoint
knob to the minimum setting for at least 6 seconds before returning to
desired temperature setting.

3. Damper Safety Circuit Fault:

a. Damper Failed to Open-The gas control proceeds to flash 3 times with a 3

second pause. The gas control waits 5 minutes, and then tries to open the
damper again.

b. Damper failed to close-the gas control proceeds to flash 2 times with a 3

second pause. The gas control waits 5 minutes, and then tries to open the
damper again.

4. Trial for Ignition Fault:

a. Damper Jostled During Trial-The gas control stops the trial for ignition.

The gas control proceeds to flash 3 times with a 3 second pause. The gas
control waits 5 minutes, and then tries to open the damper again.

b. Flame not sensed-The gas control energizes the spark igniter attempting to

light the pilot and prove flame. If flame is not sensed within 90 seconds, the
spark igniter turns off, the pilot valve is closed. The gas control LED flashes
6 times, then 1 time with a 3 second pause. The gas control waits 5 minutes
before repeating the ignition sequence.

5. Flame sensing fault:

a. Flame lost during run-The gas control turns off pilot and main valves. The

gas control increments the recycle count, if the recycle count has not
reached its limit (4), another trial for ignition begins. If the recycle count has
been reached, the gas control LED flashes 6 times, then 3 times with a 3
second pause. The gas control waits 5 minutes before repeating the ignition
sequence.

b. Flame sensed out of sequence-the gas control only looks for pilot flame

when the damper is in the open position. If flame is present when the pilot
valve is not open, the gas control proceeds to wait for flame loss and flashes
5 times with 3 second pause. This continues until flame is lost. Once the
flame signal is lost, the control flashes 6 times then, 4 times with 3 second
pause. The control waits 5 minutes before repeating the ignition sequence.

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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
LED not on or
flashing

No electrical
power

Control power switch in “OFF” position.
Supply voltage interrupted.

Turn power on.

One short flash,
once every four
seconds

Stand-by mode,
Waiting for call

for heat (no fault).

Temperature demand is satisfied.

Normal operation.
Adjust thermostat to

temp level.

“Heartbeat”
alternates
bright/dim

Thermostat
calling
for heat (no fault).

Tank temperature below set point of
thermostat.

Normal operation.
Adjust thermostat to

temp level.

Short flash once
per second

Weak pilot signal
on last call for
heat.

1. Unstable pilot.

2. Pilot tube blocked or restricted.

3. Oxidation build up on pilot electrode.

4. Wire damage to pilot assembly or bad
connection at gas valve.

1. See burner
inspection on Page

13.

2-4. See Pilot

Inspection, Testing
and Replacement
on page 15.

Two flash, three
second pause

Damper test
circuit not
working

1. Damper not in proper position or
malfunctioning-stuck in open position.

2. Obstructed venting.

3. Faulty damper.

1. Verify cord sets are
fully plugged in

2. Verify switch on
damper is in
“Automatic” position.

3. Replace damper, see
page 16.

Three flash,
three second
pause

Damper test
circuit not
working.

1. Damper not in proper position or
malfunctioning-not reaching full open
position.

2. Obstructed venting.

3. Faulty damper.

1. Verify cord sets are
fully plugged in

2. Verify switch on
damper is in
“Automatic” position.

3. Replace damper, see
page 16.

Four flash, three
second pause

Excessive tank
temperature.
System must be

reset.

1. Temperature sensor out of calibration.

2. Faulty gas control.

Replace gas control,
page 19.

Five flash, three
second pause

Undesired-false
pilot flame
present.

1. Pilot valve stuck in open position.

Replace gas control,
page 19.

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LEDStatus ControlStatus ProbableCause

Service Procedure

Six-one
flash, three
second
pause

Failed to light
pilot.
System auto

resets.

1. Unstable pilot.

2. Pilot tube blocked or restricted.

3. Oxidation build up on pilot electrode.

4. Wire damage to pilot assembly or bad
connection at gas valve.

1. See Burner
Inspection on page

13.

2. See Pilot Inspection,
Testing and
Replacement on
page 15.

Six-two flash,
three second
pause

Damper test
circuit not working
properly during
burner operation,
system auto
resets after (5)
minutes.

1. Damper not in proper position or
malfunctioning-damper moved from full open
position during run cycle.

2. Obstructed venting.

3. Faulty damper.

4. Damper jostled during run cycle.

Page 16.

Six-three
flash, three
second
pause

Pilot flame
extinguished.
System auto

resets.

1. Unstable pilot.

2. Pilot tubing kinked or blocked.

3. Oxidation build-up on pilot electrode.

4. Wire damage to pilot assembly or bad
connection at gas control.

5. Insufficient combustion air.

6. Insufficient gas pressure.

1-4. Page 15.

5-6. Refer to Installation
& Operation Manual.

Six-four
flash, three
second
pause

Undesired-false
pilot flame
sensed.
System auto

resets.

Pilot valve stuck in open position.

Replace gas control,
Page 19.

Seven flash,
three second
pause

Flammable vapor
sensor or
resettable thermal
switch fault
detected.

1. Flammable vapor present

2. Flammable vapor sensor exposed to
excessive moisture

3. Flammable vapor sensor exposed to
extreme ambient temperature

4. Resettable thermal switch open

1-3. Flammable sensor

testing, Page 21.

4. Resettable thermal
switch testing, Page
32

Eight-one
flash, three
second
pause

Flammable vapor
sensor out of
specification.

Flammable vapor sensor out of specification. Page 20.

Eight-two
flash, three
second
pause

Temperature
Sensor fault.

1. Damage to temperature sensor wire.

2. Temperature sensor resistance out of
range.

Replace gas control,
Page 19.

Eight-three
flash, three
second
pause

Gas Control
electronics fault
detected.

1. Control needs to be reset.

2. Control is wet or physically damaged.

1. Interrupt power supply

2. Replace gas control,

page 19.

Eight-four
flash, three
second
pause

Gas valve fault
detected.

1. Control needs to be reset.

2. Control is wet or physically damaged.

1. Interrupt power supply

2. Replace gas control,

page 19.

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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.
b) Gas pressure is out of specification.
c) Pilot flame not fully engulfing spark/flame sensor.

Main burner should light smoothly from pilot and burn with a blue flame with a minimum of yellow
tips.

Main burner must be free from any debris accumulation that may affect burner operation (see
burner cleaning procedure on page 14).

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

Burner Cleaning

Step 1. Position gas control power

switch to the “OFF” position and
unplug heater from wall outlet.

Step 2. Turn off gas supply to water

heater.

Step 3. Remove outer jacket door and

inner door per service
procedure IX on page 25.

Step 4. Disconnect pilot tube (7/16” wrench)

and feedline (3/4” wrench) from the

gas control.
Step 5. Disconnect igniter/flame sensor wire from gas control.
Step 6. Remove burner assembly from the combustion chamber.
Step 7. Thoroughly inspect burner surface area and burner port area and remove

any loose debris.
Step 8. Unscrew burner from main burner orifice

Step 9. Remove main burner orifice from

feedline (1/2” wrench on steel

burners) inspect orifice, clean or

replace if necessary.
Step 10. Reassemble burner and reinstall

into water heater. Restore gas

supply and check for gas leaks.
Step 11. To resume operation, follow the instruction located on the lighting

instruction label or the lighting instruction located in the installation and

operation manual.

NOTICE

Feedline nut for natural gas control
uses right hand threads, LP control

uses left hand threads.

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

Pilot Inspection, Testing and
Replacement

Step 1. Position gas control power

switch to the “OFF” position
and unplug heater from wall

outlet.
Step 2. Turn off gas supply to water heater.
Step 3. Remove outer jacket door and inner door per

service procedure IX on page 25.

Step 4. Disconnect pilot tubing nut (7/16”

wrench) and feedline nut (3/4” wrench)

from gas control.
Step 5. Disconnect igniter/flame sense wire

from gas control.
Step 6. Remove burner assembly from

combustion chamber.
Step 7. Remove pilot assembly from feedline (1/4” nut driver).
Step 8. Visually inspect igniter/flame sense wire for

damage. Replace pilot if damage is found.
Step 9. With a multi-meter set to ohms setting,

check continuity through igniter/flame

sense wire. Replace pilot if no continuity.
Step 10. Visually inspect igniter/flame sense

electrode for deterioration. Replace pilot

as necessary. Electrode should not be in

contact with pilot hood, if so, carefully

adjust electrode to a gap of distance of

3/32” (.09) from pilot hood.
Step 11. Visually inspect igniter/flame sense electrode

for oxidation build up. Carefully clean any

oxidation using very fine emery cloth.
Step 12. Visually inspect pilot tubing for kinks or

cracks. If damage is found, replace pilot.
Step 13. Inspect pilot tubing and pilot orifice for blockage:

a. Remove ferrule nut from bottom of pilot assembly (7/16” wrench).
b. Remove pilot tube and pilot orifice.
c. Inspect pilot tubing and pilot orifice for blockage. Clean or replace as necessary.

Step 14. Reassemble pilot and install on feedline. Reinstall burner assembly to

water heater. Restore gas supply and check for gas leaks.
Step 15. To resume operation, follow the instructions located on the lighting

instruction label or the lighting instructions located in the installation and

operation manual.

NOTICE

Feedline nut for natural gas control
uses right hand threads, LP control

uses left hand threads.

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

Damper Removal & Installation

Step 1. Position the power switch on the gas

control to the “OFF” position and unplug
the water heater from the wall outlet.

Step 2. Disconnect the vent system from the draft

hood that is mounted on top of the damper

Step 3. Remove the draft hood from the damper

and retain it for use on the new damper.

Step 4. Disconnect the cord sets from the damper.

Step 5. Remove the two mounting screws from the

damper using a ¼” nut driver and retain for
later.

Step 6. Carefully remove the damper from the top

of the water heater.

Step 7. Clean any debris from the jacket head of

the water heater.

Step 8. Set the new damper in place using the

water heater tank flue and the screw holes
in the jacket head.

Step 9. Secure the damper in place using the

screws from step 5.

Step 10. Re-install the draft hood from Step 3.
Step 11. Reconnect the vent system to the draft

hood.
Step 12. Reconnect the cord sets from step 4.
Step 13. Plug the water heater into the wall outlet.
Step 14. Position the gas control power switch in to

the “ON” position.
Step 15. To resume operation, follow the instructions located on the lighting

instruction label or the lighting instructions located in the installation and

operation manual.

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17



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.

Manifold Pressure Testing

(this procedure presumes a maximum
line pressure of 14.0” W.C.)

Step 1. Set the Gas Control to the “OFF” position.
Step 2. Remove pressure tap plug and install 1/8”

NPT pipe, coupling & pressure tap.
Step 3. Connect manometer to pressure tap.
Step 4. Follow instructions located on the lighting

instructions label and proceed to light the

main burner and observe manometer

reading.
Step 5. Proper operating range for Natural Gas is

4.0” ±0.5” W.C. Proper operating range

for Propane gas is10.0” ±0.5” W.C.
Step 6. If pressure is within the range specified in

the previous step, set Gas Control knob to

the “OFF” position, remove manometer

and pressure tap, and replace pressure

tap plug. Check for gas leaks prior to

placing water heater back into operation

by following the instructions located on

the lighting label, or the lighting

instructions located in the installation and

operation manual.
Step 7. If gas pressure is outside the specification

noted above, refer to page 19 to replace

gas control or valve body.

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18


ECO (Energy Cut Out)

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.

Determine Water Temperature Inside Tank

Step 1. Position gas control power switch to “OFF” position.
Step 2. Draw approximately 4 gallons of water from the drain valve into a container

and discard. Draw an additional gallon and immediately measure water
temperature using an accurate thermometer (It may be necessary to open
a hot water faucet to allow heater to drain).

Step 3. Compare the measured water temperature with the setting on the gas

control. In most instances, they should not differ by more than approx.
10°F.

WARNING

Stored water may be HOT WHEN PERFORMING THE FOLLOWING STEPS IN

THIS PROCEDURE. Take necessary precaution to prevent personal injury.

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19

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Gas Control Removal From Water Heater

Step 1. Position the gas control power switch to the “OFF”

position and unplug heater from wall outlet.
Step 2. Drain the heater to a point below the gas control level.
Step 3. Turn off the gas supply to the water heater and

disconnect gas piping from the gas control.
Step 4. Disconnect wire harnesses from the gas control.
Step 5. Remove outer jacket door and inner door per service

procedure IX on page 25.
Step 6. Disconnect pilot tubing nut (7/16” wrench) and feedline

nut (3/4” wrench) from gas control.
Step 7. Disconnect igniter/flame sensor wire from gas control.
Step 8. Remove Gas Control from water heater by rotating

counter clockwise. DO NOT use a wrench on the Gas

Control body, damage to the Gas Control may occur. If

necessary, use a length of ½” NPT pipe threaded into

the gas inlet of Gas Control.

Step 9. Install a new gas control into the water heater by rotating clockwise. DO

NOT use a wrench on the gas control body. Damage to the gas control
may occur. If necessary, use a length of ½” NPT pipe threaded into the

gas inlet of the gas control.
Step 10. Reattach main burner feedline and pilot tube.
Step 11. Reattach igniter/flame sensor wire.
Step 12. Connect wire harnesses to the gas control.
Step 13. Reinstall inner door assemblies per service procedure IX on page 25.
Step 14. Reinstall outer door.
Step 15. To resume operation, follow the instructions located on the lighting

instruction label or the lighting instructions located in the installation and

operation manual.

NOTICE

Feedline nut for natural gas
control uses right hand
threads, LP control uses
left hand threads.

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20


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. Resistance

must be between 3,000 ohms and

48,000 ohms. If outside of this range

replace Flammable Vapor Sensor.

CAUTION

DO NOT use a standard multi-meter probe for this

test. Doing so will damage connector. Use

special pin type electronic probes or small

diameter wire pins inserted into connector.

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21

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Diptube Inspection & Replacement

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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.

Step 2. Turn off the cold water supply to the water heater. Connect a hose to the drain

valve of the water heater and route to an open drain. Open a nearby hot water
faucet to vent the water heater for draining. Open the drain valve of the water
heater and allow the water heater to drain to a point below the inlet connection

nipple.
Step 3. Disconnect the inlet nipple from the plumbing system.
Step 4. With an appropriate tool such as a pipe wrench, remove the inlet nipple/diptube

from the water heater. Use caution not to damage the pipe threads.
Step 5. Visually inspect the inlet nipple/diptube. The inlet nipple/diptube should be free

of cracks and any blockage. The Hydrojet slots should be open and free of any

blockage. Any damage such as cracks, restriction due to deformation or

unintentional holes are not field repairable and the inlet nipple/diptube must be

replaced.
Step 6. Upon completion of inspection or subsequent replacement, reinstall the inlet

nipple/diptube into the water heater. Connect the nipple to the plumbing

system, resume water supply and refill with water.
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.



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.

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22


Anode Inspection & Replacement



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. 

Step2. Turn off the cold water supply to the water heater. Connect a hose to the drain

valve of the water heater and route to an open drain. Open a nearby hot water
faucet to vent the water heater for draining. Open the drain valve of the water
heater and allow the water heater to drain to a point below the outlet
connection nipple.

Step3. Disconnect the outlet nipple from the plumbing system.
Step4. With an appropriate tool such as a pipe wrench, remove the outlet

nipple/anode from the water heater. Use caution not to damage the pipe
threads.

Step5. Visually inspect the outlet nipple/anode. The outlet nipple/anode should show

signs of depletion, this is normal. If depletion is ½ of the original anode
diameter (approximately ¾” diameter), replacement is recommended. If any of
the steel core of the anode is exposed, replacement is recommended.

Step6. Upon completion of inspection or subsequent replacement, reinstall the outlet

nipple/anode into the water heater. Connect the nipple to the plumbing
system, resume water supply and refill with water.

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.

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.

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23



Flue Baffle Inspection and Replacement

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.

Step 2. Disconnect the vent system from the

draft hood that is mounted on top of the
damper.

Step 3. Remove the draft hood from the

damper and retain it for later use.

Step 4. Disconnect the cord sets from the

damper.

Step 5. Remove the two screws from the

damper mounting screws using a ¼”
nut driver and retain for later.

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24


Flue Baffle Inspection and Replacement (cont.)

Step 6. Carefully remove the damper

from the top of the water
heater.

Step 7. Remove the flue baffle from

the water heater.

Step 8. Inspect the baffle for

deterioration and missing
restrictors. Clean any scale
or debris build-up. Replace
with a new baffle, as
necessary.

Step 9. Reinstall the baffle into the flue. Be sure the baffle hanger tab is inserted

into the notch locations at the top of the flue.

Step 10. Check the burner to ensure no scale has accumulated during operation.

See the “Burner Cleaning Procedure” on page 14, if accumulation has
occurred.

Step 11. Clean any debris from the jacket

head of the water heater.

Step 12. Set the new damper in place using

the water heater tank flue and the
screw holes in the jacket head.

Step 13. Secure the damper in place using

the screws from step 5.
Step 14. Re-install the draft hood from Step 3.
Step 15. Reconnect the vent system to the

draft hood.
Step 16. Reconnect the cord sets from step 4.
Step 17. Plug the water heater into the wall

outlet.
Step 18. Position the gas control power switch

in to the “ON” position.
Step 19. To resume operation, follow the

instructions located on the lighting

instruction label or the lighting

instructions located in the installation

and operation manual.

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25



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. Remove (2) ¼” hex drive screws from right side inner door.
Step 4. Remove (2) ¼” drive screws from flange section of inner door.
Step 5. Remove (2) ¼” drive screws from left side inner door.
Step 6. Remove inner door and inspect per step 7.

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Step 7. Fully inspect inner door gaskets for the

following:

-Tears -Other imperfections that will inhibit proper seal

-Missing Material -Gasket adhesion to inner door

-Cracks -Material left on combustion chamber (around opening)

-Dirt or debris

If the gasket is not affected by any of the above, gasket replacement is not required. If
replacement is required, proceed to Inner Door Gasket Replacement Procedure.

Inner Door Gasket Replacement Procedure

Step 8. After inspection of inner door as noted in step 7, completely remove gasket and

adhesive residue from right and left side inner doors as needed.

WARNING

If the information in these instructions is not followed exactly, a
fire or explosion may result causing property damage, personal

injury or death.

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26


Step 9. Use RTV sealant (recommended bead size 1/8”) to secure the inner door gasket

to the inner door sections (right & left). Refer to illustration below for proper
application. Note the overlap configuration in the flange area of the inner door.
Set the flange section first, this will help to achieve the proper overlap position.

Installation of Inner Door With Gasket

Step 10. Clean any residual gasket residue or other debris

from combustion chamber surface before installing
the inner door/gasket assembly.

Step 11. Place the left side inner door into position first.

Firmly position the radiused channel of the inner
door around the feedline. Using the ¼” hex drive
screws from step 5, secure left side inner door in
place. DO NOT OVER TIGHTEN SCREWS

Step 12. Position pilot tube and igniter/sensor wire

against left side inner door flange gasket. DO

NOT ROUTE THROUGH RADIUSED
CHANNEL WITH FEEDLINE.

WARNING

Stripped fastener connections

may allow for seal breach of

inner door. A seal breach may

result in a fire or explosion

causing property damage,

personal injury or death. Do

not over tighten screws in

steps 8, 10 and 11.

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27



Installation of Inner Door With Gasket (cont.)

Step 13. Firmly place right side inner door flange against the left side inner door flange

and secure with (2) ¼” hex drive screws from step 4. DO NOT OVER
TIGHTEN SCREWS.

Step 14. 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” hex drive screws from step 3. DO NOT OVER TIGHTEN
SCREWS. Verify both left and right sides of inner door are properly
positioned and sealed against the combustion chamber.

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Step 15. Replace outer jacket burner access door.

To resume operation follow the instructions located on the lighting instruction label or
the lighting instructions located in the installation and operation manual.

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28


115 VAC Circuit Trace

Step 1. Verify 115 VAC and proper

polarity at wall outlet.

Step 2. With unit plugged in and

control power switch in the
“ON” position verify LED
status.

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

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29



Damper Relay Installation

If the damper fails and the water heater operation is necessary temporarily, a relay,
p/n 233-47642-00, and harness, p/n 239-51714-00, can be ordered from the Bradford
White Service Parts Department.

Step 1.

Position the gas control power switch to
the “OFF” position and unplug the water
heater from the wall outlet.

Step 2.

Disconnect the vent system from the
draft hood that is mounted on top of the
damper.

Step 3.

Remove the draft hood from the damper
and retain it for use later.

Step 4.

Unplug the cord sets from the damper.

Step 5.

Remove the two damper housing
screws using a ¼” nut driver or wrench
and retain for later use.

Step 6.

Move the damper blade into the vertical
position.

Step 7.

Move the switch inside the back of the
damper to the “Service” position
(towards the back of the water heater,
as shown in the illustration above).

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30


Damper Relay Installation (cont.)

Step 8.

Remove the Red wire
in the damper housing
from its location.
Connect the ¼” Red
female connector on
the relay harness in its
place

Step 9.

Remove the Yellow wire in
the damper housing from
its location. Connect the
¼” Yellow female
connector on the relay
harness in its place.

Step 10.

Remove the Blue wire in the damper
housing from its location. Connect
the ¼” Blue female connector on the
relay harness in its place.

Step 11.

Remove the White wire in the damper housing
from its location. Connect the ¼” White female
connector with the piggy back connector on the
relay harness in its place.

Step 12.

Using the White wire that was
removed in Step 11, connect it to
the piggyback spade connector
that was installed in Step 11.

Step 13.

Connect the other ends of
the relay harness to the
relay, as shown.

Step 14.

Place the relay and its harness fully
inside the damper housing.

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31



Damper Relay Installation (cont.)

Step 15.

Secure the damper housing cover in place using the screws from step 5.

Step 16.

Re-install the draft hood from Step 3.

Step 17.

Reconnect the vent system to the draft hood.

Step 18.

Reconnect the cord sets from step 4.

Step 19.

Plug the water heater into the wall outlet.

Step 20.

Move the gas control power switch in to the “ON” position.

Step 21.

To resume operation, follow the instructions located on the lighting
instruction label or the lighting instructions located in the Installation and
Operation manual.

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32


Resettable Thermal Switch Continuity Testing

Step 1.

Move the gas control power switch to the
“OFF” position and unplug the water heater
from the wall outlet.

Step 2.

Remove the outer jacket door.

Step 3.

Disconnect the wire leads from the resettable
thermal switch.

Step 4.

Using a multimeter capable of measuring
continuity (ohms), place one probe of meter
on one of the brass connection tabs of the
resettable thermal switch, and the remaining
probe on the other connection tab.

Step 5.

If continuity Is indicated, the switch is closed,
allowing millivolt current to pass.

Step 6.

If continuity is not indicated, the switch is
open, possibly due to an overheating
condition. The switch is designed to open at
predetermined temperatures depending on the
model. An open switch can be reset by
depressing the red colored button located at
the center of the switch. The overheating
condition must be determined prior to putting
the heater back in service.

Probable cause for resettable thermal switch activation

Probable Cause Corrective Action

Insufficient combustion air

1. Verify adequate

combustion air supply is
available.

2. Clear jacket slot openings

of any dirt, dust,
restrictions or other
obstructions.

3. Inspect flame arrestor

plate and clean with a stiff
brush, compressed air
and/or vacuum to remove
scale deposits and debris.

1. Weak switch or switch

is out of calibration.

2. Incorrect switch.

1. Replace resettable

thermal switch.

2. Verify switch color code

and approximate
temperature.

Flammable vapor incident Replace water heater.

Resettable thermal switch color code

reference

Color code

Approximate switch

activation temperature

(open)

Blue 240°

Yellow 270°

Red 290°

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33



Resettable Thermal Switch Replacement

Step 1.

Move the gas control power switch to
the “OFF” position and unplug the
water heater from the wall outlet.

Step 2.

Remove the outer jacket door.

Step 3.

Disconnect wire leads from the
resettable thermal switch.

Step 4.

Remove resettable thermal switch from
the inner door (Phillips screw driver).

Step 5.

Place new resettable thermal switch in
place. Be sure the contact surface of
resettable thermal switch and the inner
door are free of any debris. Secure the
resettable thermal switch into place
using screws from step 4.

DO NOT OVER TIGHTEN SCREWS.

Step 6.

Reconnect wire leads from the gas
valve to the resettable thermal switch.

Note: Wire terminations are

interchangeable with either
resettable thermal switch
connection.

Step 7.

Replace the outer jacket door.

Step 8.

To resume operation follow the
instructions located on the lighting
instruction label or the lighting
instructions located in the installation
and operation manual.

33

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34


ScreenLok® Flame Arrestor Cleaning



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 IX on page 25.
Step 4. Disconnect main burner feedline (3/4” wrench), pilot tube (7/16” wrench) and

igniter/flame sensor wire from gas control and remove burner assembly from
combustion chamber.

Step 5. Clean ScreenLok

®

Flame Arrestor using a stiff brush, compressed air and/or
shop vacuum to remove any scale or other debris accumulation. Using a soft
brush, clear jacket openings from any dirt, dust, restrictions or other obstructions.

Step 6. Remove any debris from the burner assembly per procedure D-I on page 13 and

reinstall burner assembly into combustion chamber.

Step 7. Reconnect the feedline, pilot tube and igniter/flame sensor wire to the gas control
Step 8. Reinstall the outer jacket door and the inner doors per service procedure D-IX on

page 27.

Step 9. To resume operation follow the instructions located on the lighting instruction

label or the lighting instructions located in the Installation and Operation manual.



34

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35



Glossary of Terms

BTU British Thermal Units
GPM Gallons per Minute
Hz Hertz
kWh Kilowatt hour
LED Light Emitting Diode
NPT National Pipe Thread
Ohms Ohms of resistance
psi Pounds per Square Inch
RPM Revolutions per minute
ECO Energy Cut Out
VAC Volts Alternating Current
“ w.c. Inches of Water Column
ºC Degrees Centigrade
ºF Degrees Fahrenheit

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35

Res. D Series

36
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

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

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1. Draft Diverter

2. Damper

3. Heat Trap Outlet

4. Hot Water Outlet
Anode

5. Heat Trap Inlet

6. Flue Baffle

7. Inlet Diptube

8. Damper Wire Harness

9. Temp. and Pressure
relief valve

10. Brass Drain Valve

11. Right side inner door
ass’y

12. Resettable thermal
switch

13. Outer door

14. Left side inner door
ass’y

15. FV sensor clip

16. FV sensor

17. FV wire harness

18. Gas valve

19. Burner ass’y

20. Burner

21. Orifice

22. Pilot ass’y

23. Feedline

24. Inner door gasket kit

25. ASSE mixing device

26. Heat trap kit

27. Damper svc harness

28. Damper svc relay

36