UDS / UDH Series
Ultra Low NOx Direct Vent Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
ECO-Defender Safety System® Models
UDS140S*FRN
UDS150S*FRN
UDH1504T*FRN
UDH165T*FRN
UDH175S*FRN
UDH50T45FR*N
UDH65T45FR*N
UDH75T50FR*N
(*) Denotes Warranty Years
Manual 238-49640-00A
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INTRODUCTION
The new Bradford White UDS and UDH water heaters are designed to
provide reliable performance with enhanced standard features. Design
features include reliable standing pilot ignition system, enhanced
diagnostics, simplified servicing, certified FVIR technology and Ultra
Low NOx emissions.
The UDS and UDH water heaters use a combustion system where
combustion air is drawn from the outside of the building. The gas control
maintains water temperature and maintains gas flow. If a situation outside
of normal operating parameters exists, the gas control diagnostic LED wll
flash a code to positively identify an operational issue.
This service manual is designed to facilitate problem diagnosis and
enhance service efficiency. To further promote quicker service times the
gas valve can be removed and replaced without draining the water heater.
Please read the service manual completely before attempting service on
this new series of direct vent water heaters.
How the Safety System Works
During normal operation, air for the combustion chamber is drawn into
the water heater through the vent pipe from outside your building. The air
travels into the closed combustion chamber. The air then mixes in a
normal manner with supplied gas and is efficiently combusted, producing
Ultra Low NOx emissions.
In the unlikely event trace amounts of flammable vapors are present in the
area surrounding the water heater, the sealed combustion system prevents
the flammable vapors from reaching the ignition source.
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Honeywell Gas Control Troubleshooting Chart
Flammable Vapor Ignition Resistant Water
Heaters
Observe green LED indicator on
Gas Control. Error flash codes are
displayed with a three second pause
before repeating. Check and repair
the system as noted in the
Green LED Indicator
troubleshooting table below.
Service
Procedure
LED Status
Control Status
Probable Cause
If the pilot will not stay
.
lit replace pilot
None (LED not on or
flashing
Pilot assembly is not lit
Gas Control is not powered. Light pilot. assembly. If problem
persists replace Gas
Control.
1. If set point knob is in “PILOT”
position then pilot flame is detected.
Turn set point knob to desired setting.
2. If the set point knob is already at
the desired setting, the water heater is
satisfied.
1. Gas Control is powered and waiting
for the set point knob to be turned to a
One flash and three
second pause
1. Adjust set point knob
water temperature setting.
to desired setting.
2. Water heater is satisfied and
operating normally.
Two quick flashes
and a three second
pause
Gas control is calling for heat (no
fault).
Tank temperature below set point of
Normal operation.
thermostat.
Set point knob has been recently
turned to the “OFF” position. Wait
until LED goes out before
attempting to relight
LED will go out and the
LED on continuously
(Solid)
Set point knob was turned to “OFF” control will function
position.
normally when the pilot
is lit.
1. See service
procedure II
2. See service
procedure III
3. See service
procedure III
1. Thermopile failure
Two flashes and
three second pause
Weak pilot signal detected. System will 2. Unstable pilot
reset when pilot flame is sufficient.
3. Pilot tube block or restricted.
1. See service
procedure V
2. See service
procedure V
1. Temperature sensor out of
calibration
2. Faulty Gas Control
Four flashes and
three second pause
Excessive tank temperature. System
must be reset.
4
4
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Honeywell Gas Control Troubleshooting Chart
Flammable Vapor Ignition Resistant Water
Heaters
Observe green LED indicator on
Gas Control. Error flash codes are
displayed with a three second pause
before repeating. Check and repair
the system as noted in the
Green LED Indicator
troubleshooting table below.
Service
Procedure
LED Status
Control Status
Probable Cause
1. Damage to the temperature sensor.
2. Temperature sensor resistance out of
range.
Five flashes and
three second pause
1. See service
procedure V
Thermostat/well sensor fault.
1. Check T&P valve
2. Check all water
fittings.
3. Pressurize and leak
test tank.
Six flashes and
three second pause
Water leak detected by accessory
module.
Excessive amount of water in drain
pan/water dam.
1. Control needs to be reset.
Gas Control electronic fault detected. 2. Control is wet or physically
damaged.
1. Reset Gas Control
2. Replace Gas
Control.
Seven flashes and
three second pause
Eight flashes and
three second pause
Standing pilot remains on while set
Pilot valve stuck in open position.
point knob is in “OFF” position.
Replace Gas Control.
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SERVICE PROCEDURE I
Inner Door/Gasket Removal, Inspection
Replacement and Reinstallation
The Bradford White
Inner Door Removal Procedure
Step 1.
Step 2.
Step 3.
Step 4.
Rotate set point knob of the gas control to the “OFF” position.
Turn off the gas supply to the water heater
Remove the outer door.
Remove the four (4) ¼” hex drive screws holding the
right side inner door in place
Step 5.
Step 6.
Remove the three (3) ¼” hex drive screws holding the
left side burner door in place.
¼” Hex Drive Screws at Flange
Area of Inner Door
¼” Hex Drive Screws Right
Side Inner Door
¼” Hex Drive Screws on Left
Side Inner Door
Disconnect the pilot tube from the gas control using a
7/16" wrench. Remove the main burner feedline from
the gas control with a ¾” wrench.
Step 7.
Step 8.
Disconnect the spark igniter wire from
the gas control.
Remove the burner assembly from the combustion chamber.
Step 9. Fully inspect burner and inner door gaskets for the following:
>Tears
>Other imperfections that will inhibit proper seal
>Gasket adhesion to inner door
>Material left on combustion chamber (around opening)
>Missing Material
>Cracks
>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.
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SERVICE PROCEDURE I
Inner Door/Gasket Removal, Inspection
Replacement and Reinstallation
The Bradford White
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 10. After inspection of inner door as noted in step 9, completely remove gasket and adhesive residue from
burner and left side inner doors as needed.
Step 11. Use RTV sealant (recommended bead size 1/8") to secure the inner door gasket to the inner door sections
(right & burner). The burner door gasket must be sliced in the location shown on the illustration below in
order to slide the gasket over the burner venturi. Refer to illustration below for proper RTV sealant
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 over lap position.
Installation of Inner Door With
Gasket.
Step 12. Clean any residual gasket residue or other
WARNING
debris from combustion chamber surface
before installing the inner door/gasket
assembly.
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 13, 15 and 16.
Step 13. Place the burner door into position first. Tighten
the pilot line nut to the gas control. Tighten the
main burner feedline to the gas control. Use the
¼” hex drive screw without the built-in washer
to secure the right side of the burner door to the
chamber. Use the ¼” hex drive screws with the
built-in washer to secure the left side of the
burner door in place. DO NOT OVER
If a fastener connection is stripped,
contact the manufacturer listed on the
water heater rating plate.
TIGHTEN SCREWS.
Step 14. Position the fiberglass sock containing the igniter
wire, the pilot tube and the armored thermopile
cable against the inner door flange.
Page 37
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SERVICE PROCEDURE I
Inner Door/Gasket Removal, Inspection
Replacement and Reinstallation
The Bradford White
Position fiberglass sock, pilot
tube and armored thermopile
cable against flange.
Step 15. Firmly place right side inner door flange against the burner door flange and secure with two ¼” drive
screws from step 5. DO NOT OVER TIGHTEN SCREWS.
Step 16. Align right side inner door to combustion chamber and verify the fastener holes of the combustion
chamber are aligned with the right side inner door slotted opening. Verify seal integrity around combustion
opening. Secure right side inner door using 1/4” hex drive screws from step 5. DO NOT OVER TIGHTEN
SCREWS. Verify both burner and right sides of the inner door are properly positioned and sealed against
the combustion chamber.
Secure flange with
¼" drive screws.
Verify threaded hole
alignment with slotted
openings in inner door.
Step 17. Reconnect the igniter wire to the gas control
Step 18. Replace outer jacket burner access door.
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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The Bradford White
SERVICE PROCEDURE II
Thermopile Testing and Replacement
OPEN CIRCUIT THERMOPILE TESTING
The following test should be performed while the pilot flame is on.
Step 1.
Step 2.
Turn knob to pilot position and depress.
Continue pressing knob and remove red (+) thermopile wire from the red wire leading from the gas control.
Also remove white (-) thermopile wire from the gas control.
Step 3.
Using a multimeter capable of measuring millivolts, connect the positive side of the multimeter to the
red (+) thermopile wire connector. Connect the negative side of the multimeter to the white thermopile
connector.
White (-) thermopile wire
Red (+) thermopile wire
Red gas control wire
Red (+) thermopile wire
White (-) thermopile wire
Normal thermopile operation will be between 350mV - 850mV. If reading is less than 350mV, replacement of pilot
assembly is recommended following SERVICE PROCEDURE III.
Step 4.
Step 5.
If thermopile reading is between 350mV - 850mV, remove multimeter and reconnect red (+) thermopile wire
to red wire leading from the gas control. Reconnect white (-) thermopile wire negative (-) terminal on gas
control.
Release Gas Control knob and turn to desired setting to resume normal operation.
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The Bradford White
SERVICE PROCEDURE III
Pilot Assembly Inspection, Cleaning
and Replacement
For Honeywell Control, rotate knob
counter-clockwise to the “OFF”
position.
PILOT/ELECTRODE ASSEMBLY INSPECTION,
CLEANING AND REPLACEMENT
Step 1.
Turn off gas supply to water heater. Rotate knob
Thermopile
connections
of gas control/gas valve
to “OFF” position.
Pilot tube
Step 2.
Step 3.
Remove outer jacket door.
Remove burner and right side inner door per
SERVICE PROCEDURE I, steps 1 through 8.
Step 4
Disconnect thermopile, pilot tube,
and feedline from gas control.
Step 5
Step 6.
Disconnect igniter wire from gas control.
Remove pilot/electrode assembly from burner (¼”
drive tool).
Feedline nut
Igniter wire
Step 7.
Inspect pilot for the following:
a) Primary air openings for blockage. Must be free from any
debris (dirt, lint, etc).
b) Kinks or cracks in the pilot tube. If found,
the pilot must be replaced.
Primary air
opening
Step 8.
Inspect pilot orifice:
a) Remove ½" nut from bottom of pilot assembly.
b) Remove pilot tube and pilot orifice.
c) Inspect pilot orifice for blockage, must be cleaned or replaced.
(Honeywell pilot orifice not replaceable, replace pilot assembly)
Step 9.
Install pilot/electrode assembly to feedline, secure with screw from step 6.
Step 10. Re-Install burner assembly and right side inner door per SERVICE
PROCEDURE I, steps 9 through 19.
Pilot orifice
Step 11. 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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The Bradford White
SERVICE PROCEDURE IV
Igniter, Electrode Testing
and Replacement
IGNITER, ELECTRODE TESTING AND REPLACEMENT
With the pilot not in operation (no pilot flame) you can check the igniter and electrode circuit by viewing pilot
thru the sight glass located on the inner door and observing the spark action.
Step 1.
Step 2.
Remove outer jacket door.
Repeatedly depress the igniter while viewing the pilot thru the sight glass. If a spark is
present, the circuit is OK. If there is no spark, proceed to step 3.
View spark
Action through
Sight glass
Repeatedly
Depress Piezo
Igniter
Step 3.
Remove white wire from igniter and install a jumper wire in its place. Hold the other end of the
jumper by the wire insulation or using an insulated tool, next to an unpainted surface such as the
feedline and depress the igniter. If there is a spark, the igniter is OK, the pilot is not functioning and
must be replaced, see SERVICE PROCEDURE III for pilot replacement. If no spark is present the
igniter is not functioning and must be replaced. See SERVICE PROCEDURE V for gas control
disassembly/reassembly.
Insulated jumper
wire
Feedline
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SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
The Bradford White
Honeywell Gas Control Testing, Disassembly, and Replacement
The Gas Control is made up of (5) major components; the control cover, the piezo igniter, the valve body, the temperature
sensor, and the back plate. The Gas Control is designed so that any of these components may be replaced without
replacing the entire Gas Control.
Valve Body
Backplate
Gas Control
Cover
Gas Control
Cover Screw
Temperature
Piezo Igniter
Sensor
Valve Body
Screw
Insertion Stick
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.
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The Bradford White
SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
MANIFOLD PRESSURE TESTING (this procedure presumes a maximum line pressure of 14.0" w.c.)
Step 1.
Step 2.
Set the Gas Control to the “OFF” position.
Remove pressure tap plug and install
1/8" NPT pipe, coupling, & pressure tap.
Gas Control shown in the “OFF” position
Step 3.
Step 4.
Connect manometer to pressure tap.
Follow instructions located on the lighting
instructions label and proceed to light the main
burner and observe manometer reading.
Step 5.
Step 6.
Proper operating range for natural gas is: 4.0" 0.5" w.c.
Proper operating range for LP gas is: 10.0" 0.5" w.c.
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 instruction 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 “Honeywell Gas Control Testing, Disassembly,
and Replacement” to replace Gas Control or valve body.
Pressure Tap
Shown Installed
THERMOPILE TESTING
See SERVICE PROCEDURE II
ECO (Energy Cut Off) TESTING
The Honeywell Gas Control is designed with an ECO device that will reset.
To reset the Gas Control after an error 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.
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The Bradford White
SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
TEMPERATURE SENSOR TESTING
CAUTION
DO NOT use standard multimeter probes for this test.
Doing so will damage connector. Use special pin type
electronic probes or small diameter wire pins inserted
into connector.
If Control has gone into lockout due to excessive tank
temperature (four flash, three second pause) reset
control by rotating gas control knob to “OFF” position
and wait a minimum of (5) minutes. Then follow lighting
instructions and return gas control knob to desired
setpoint.
Observe Green LED indicator.
N
Does error code 4 (four flash, three
second pause) continue?
Y
Using a multi-meter set to the ohms setting, insert one meter probe (see caution)
into center wire position of thermal well connector, insert the second probe (see
caution) into either of the outside wire positions (see photo on left).
Temperature Sensor Testing
Following “Gas Control
Disassembly/Reassembly”
instructions, disassemble Gas
Control to access temperature
sensor.
Alternate the probe on the outside position to the opposite outside wire position
(see photo on right).
With the temperature sensor still
in the back plate, use a multi-
meter set to the Ohms setting,
determine the resistance of
temperature sensor
Resume normal operation.
(see caution and photos above)
Once the temperature sensor resistance values are known, the
water temperature must also be known to determine if the
resistance values are correct. See next page to obtain water
temperature.
N
Replace temperature
sensor
Are temperature sensor resistance values correct?
Y
Replace Gas Control
14
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SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
The Bradford White
WARNING
Stored water may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
DETERMINE WATER TEMPERATURE INSIDE TANK
Note:
It is important to understand once the resistance for the temperature sensor is determined from the
previous page, water flow through the water heater should not occur. Prior to drawing water from drain
valve, turn off the cold water supply to the water heater. This will prevent cold water flow into the tank
affecting the resistance value of the temperature sensor.
Step 1.
Step 2.
Step 3.
Set the Gas Control knob to the “OFF” position.
Turn off inlet water supply to water heater.
Draw approximately 4 gallons of water from drain valve into a container, or suitable drain, 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 water heater to drain.
Step 4.
Using the chart below, determine correct resistance value for the water temperature from step 3.
Example:
If temperature of water is 84°F, then the resistance through the sensor would be
8449 (see shaded area). NOTE: Sensor resistance increases as the temperature
decreases.
Sensor Resistance at Various Temperatures
In Degrees F
°F
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
0
1
2
3
4
5
6
7
8
9
26109
19906
15314
11884
9299
7333
5827
4663
3758
3048
2488
2043
1688
1402
1170
982
25400
19383
14925
11592
9078
7165
5697
4562
3679
2986
2439
2004
1656
1376
1150
965
24712
18876
14548
11308
8862
7000
5570
4464
3602
2925
2391
1966
1625
1351
1129
949
24045
18383
14180
11032
8653
6839
5446
4368
3527
2866
2344
1928
1595
1327
1110
933
23399
17905
13823
10763
8449
6683
5326
4274
3453
2808
2298
1891
1566
1303
1090
917
22771
17440
13477
10502
8250
6531
5208
4183
3382
2752
2253
1856
1537
1280
1071
901
22163
16990
13140
10248
8057
6383
5094
4094
3312
2697
2209
1820
1509
1257
1953
886
21573
16553
12812
10000
7869
6238
4982
4006
3244
2643
2166
1786
1481
1235
1035
871
21000
16128
12494
9760
7685
6098
4873
3922
3177
2590
2124
1753
1454
1213
1017
857
20445
15715
12185
9526
7507
5961
4767
3839
3112
2538
2083
1720
1427
1191
999
842
713
828
814
801
788
775
762
749
737
725
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The Bradford White
SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
GAS CONTROL DISASSEMBLY/REASSEMBLY
Step 1. Rotate knob of the Gas Control to the “OFF” position.
Step 2. Turn off gas supply to water heater.
Step 3. Disconnect gas supply line from Gas Control.
Step 4. Disconnect igniter wire.
Rotate knob counter-clockwise to
the “OFF” posistion.
Step 5. Disconnect main burner feedline, pilot tube and thermopile wires from gas control.
Step 6. Remove Gas Control cover screw.
Gas Control cover
screw
Step 7. Depress both tabs on the top of the Gas Control cover and pull to remove.
CAUTION
Use caution not to bend or damage valve body pins
when removing or installing Gas Control cover.
Valve body pins
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SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
The Bradford White
GAS CONTROL DISASSEMBLY/REASSEMBLY
Step 8. Disconnect temperature sensor from control board and remove wire from the temperature sensor wire routing clip.
Temperature sensor
wire routing clip
Disconnect
temperature sensor
Step 9. Remove the piezo igniter from the control cover by releasing the lock tab on the control cover.
Release lock tab
17
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The Bradford White
SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
GAS CONTROL DISASSEMBLY/REASSEMBLY
Step 10. Remove the valve body by removing screw located at the lower left corner then unclipping the lower right side
from the backplate first followed by the lower left side using a flat head screwdriver.
CAUTION
Use caution not to bend or
damage valve body pins.
Unclip lower right
side first
Unclip lower left side
second
Valve body screw
Step 11. Remove temperature sensor and insertion stick from backplate by first removing wire from the temperature sensor
wire routing clips located on the backplate. Note the orientation of insertion stick, insertion stick can only be
installed in one way.
Temperature sensor
wire routing clips
CAUTION
When reinstalling temperature sensor and insertion stick,
make sure the assembly is inserted FULLY into the
backplate and the wires are routed through the wire
routing clips. Failure to do so will not allow valve body to
be reinstalled properly and may damage temperature
Insertion stick fully
inserted into backplate
sensor wires.
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The Bradford White
SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
GAS CONTROL DISASSEMBLY/REASSEMBLY
Step 12. Remove temperature sensor from insertion stick by pulling apart as illustrated below.
Temperature sensor
Pull in this direction
Insertion stick
Pull in this direction
Step 13. To reassemble Gas Control, follow the previous steps in reverse order. Once Gas Control is reassembled, burner
assembly is reinstalled, and the gas supply line is reconnected, resume water supply to water heater. Be sure tank
is full of water before relighting.
Step 14. To resume operation, follow the instructions located on the lighting instruction label or the lighting instructions
located in the installation and operation manual.
19
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SERVICE PROCEDURE V
Gas Control
Testing, Disassembly & Replacement
The Bradford White
GAS CONTROL REPLACEMENT
Step 1. Rotate knob of the gas control
to the “OFF” position.
Rotate knob counter-clockwise to
the “OFF” position.
Step 2. Turn off gas supply to water heater.
Step 3. Disconnect gas supply line from gas control.
Step 4. Turn off water supply and drain water heater completely.
Step 5. Remove the wire clip from the feedline.
Step 6. Disconnect main burner feedline, pilot tube, white thermopile wire and igniter wire from gas control and bend
the main burner feedline and pilot tube out of the way. Also disconnect the red wire leading from the thermopile
from the red wire leading from the gas control.
Step 7. Remove the gas control from the water heater by rotating counter-clockwise. It may be necessary to use a length
of ½” NPT pipe threaded into the inlet of the gas control.
White thermopile
Pilot tube
wire
Red gas control
Red thermopile
Igniter wire
wire
wire
Main burner
feedline
Step 8. Install new gas control into the water heater.
a) Install gas control into water heater by rotating clockwise. DO NOT use a wrench on the gas control
body or damage to the gas control may occur. If necessary, use a length of ½” NPT pipe threaded into
gas inlet of gas control.
b) Bend the main burner feedline and pilot tube back to the gas control and attach to the gas control.
Connect the igniter wire and the white thermopile wire to the gas control. Connect the red wire from
the gas control to the red wire from the thermopile.
c) Gather the igniter wire, white thermopile wire and red thermopile wire near the side of the feedline.
Use the clip that was removed in Step 5 to secure the wires to the feedline.
d) Connect gas supply to inlet of gas control.
Step 9. Resume the water supply to the water heater. Be sure that the tank is full before operation is resumed.
Step 10. To resume operation follow the instructions located on the lighting instruction label or the lighting
instructions located in the installation and operation manual.
20
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SERVICE PROCEDURE VI
Burner Operation Inspection, Adjustment
Cleaning and Replacement
The Bradford White
MAIN BURNER: Inspection,
Cleaning and Replacement
At periodic intervals (not more then 6 months) a visual inspection should be made of the main burner for proper operation
and to insure no debris is accumulating.
Main burner should light smoothly from pilot and burn with a blue flame with a minimum of yellow tips. After 5 minutes
of operation the burner screen will become radiant and the flame will soften and turn orange. If the burner screen does not
become radiant after 5 minutes of operation it must be cleaned (see burner cleaning procedure below).
Main burner must be free from any debris accumulation that may effect burner operation (see burner cleaning procedure
below).
DANGER
Under no circumstances shall flammable materials be used or stored in the vicinity of the water heater. With
the inner door removed the Bradford White Defender Safety System will be inactivated. If flammable vapors
are present, a fire or explosion may result causing property damage, personal injury or death.
WARNING
Inner door and burner components may be HOT when performing this operation. Take
necessary precaution to prevent personal injury.
BURNER CLEANING
Step 1.
Step 2.
Remove burner and inner door assembly per SERVICE PROCEDURE I, steps 1 through 9.
Thoroughly inspect burner screen and burner venturi and remove any loose debris accumulation. Inspect
burner screen for any openings larger than the normal screen openings.
Step 3.
Use compressed air and/or a vacuum to remove any scale or other debris accumulation from the burner screen
and venturi.
Burner Venturi
Burner Screen
21
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SERVICE PROCEDURE VI
Burner Operation Inspection, Adjustment
Cleaning and Replacement
The Bradford White
Step 4.
Step 5.
Disconnect (unscrew) feedline from the main burner door.
Feedline
Remove main burner orifice from feed line (3/8" wrench). Inspect and
clean if necessary
Main Burner Orifice
Step 6.
Remove pilot assembly, refer to SERVICE PROCEDURE III
for cleaning and inspection.
Step 7.
Step 8.
Reassemble burner.
Reinstall burner and inner door per SERVICE PROCEDURE I,
steps 9 through 19.
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.
22
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The Bradford White
SERVICE PROCEDURE VII
Dip Tube and Anode
Inspection and Replacement
DIP TUBE INSPECTION AND REPLACEMENT
WARNING
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.
Rotate knob of gas control to “OFF” position.
For Honeywell Control, rotate knob
counter-clockwise to the “OFF”
position.
Step 2.
Turn off cold water supply to heater. Connect hose to drain spigot of water heater and route to an open drain.
Open a nearby hot water faucet to vent heater for draining. Open drain spigot of hot water heater and allow
heater to drain to a point below the inlet connection nipple.
Step 3.
Step 4
Disconnect inlet nipple from plumbing system.
With an appropriate wrench, remove inlet nipple/dip tube from the water heater. Use caution not to damage
pipe threads.
Step 5.
Visually Inspect inlet nipple/dip tube. Inlet nipple/dip tube should be free of cracks and any blockage.
Hydro-jets located near the bottom of the dip tube should be open and free of any blockage.
Anti-siphon hole located approximately 6" from the bottom of nipple, should be free of any blockage.
Any damage such as cracks, restriction due to deformation or unintentional holes are not field repairable
and the inlet nipple/dip tube must be replaced.
Step 6.
Step 7.
Upon completion of inspection or subsequent replacement, reinstall inlet nipple/dip tube into heater. Connect
nipple to plumbing system, resume water supply and refill heater with water.
To resume operation follow the instructions located on the lighting instruction label or the lighting instructions
located in the installation and operation manual.
23
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SERVICE PROCEDURE VII
Dip Tube and Anode
Inspection and Replacement
The Bradford White
ANODE INSPECTION AND REPLACEMENT
WARNING
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.
Turn off water supply to water heater. Rotate knob of gas control to “OFF” position.
For Honeywell Control, rotate knob
counter-clockwise to the “OFF”
position.
Step 2.
Turn off cold water supply to heater. Connect hose to drain spigot of water heater and route to an open drain.
Open a nearby hot water faucet to vent heater for draining. Open drain spigot of hot water heater and allow
heater to drain to a point below the outlet connection nipple.
Step 3.
Step 4
Disconnect outlet nipple from plumbing system.
With an appropriate wrench, remove outlet nipple/anode from the water heater. Use caution not to damage
pipe threads.
Step 5.
Visually Inspect outlet nipple/anode. Outlet nipple/anode should show signs of depletion, this is normal.
If depletion is ½ of the original anode diameter (approximately 5/8” diameter), replacement is recommended.
If any of thesteel core of the anode is exposed, replacement is recommended.
Step 6.
Step 7.
Upon completion of inspection or subsequent replacement, reinstall outlet nipple/anode into heater. Connect
nipple to plumbing system, resume water supply and refill heater with water.
To resume operation, follow the instructions located on the lighting instruction label or the lighting
instructions located in the installation and operation manual.
24
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The Bradford White
Generic Parts List
1
2
3
4
5
6
7
8
9
Vent Package
19 T&P Relief Valve
Air Intake Terminal
Outer Wall Mounting Plate
Backing Plate
20 ¾” NPT Tank Plug (UDH Models)
21 Feedline Spring Clip
22 Air Intake Boot
Telescopic Air Intake Tube
Telescopic Vent Tube
Intake Elbow
23 Air Intake Boot Gasket
24 Complete Right Side Inner Door
25 Screw-#10-12 x ¾ Hex Washer Head
26 Screw-#8-18 x ¾ Hex Washer Head
27 Brass Drain Valve
Exhaust Elbow
Plenum
10 Flue Reducer
28 Outer Door
11 Plenum Gasket
29 Gas Control
12 Air Intake Tube
30 Inner Door Gasket Kit
31 Heat Trap Kit
13 Air Intake Terminal Guard (Optional)
14 Flue Baffle
32 ASSE Approved Mixing Valve (Optional)
33 Ultra Low NOx Burner Assembly
34 Pilot Assembly
15 Heat Trap (Inlet)
16 Cold Water Inlet Tube
17 Hot Water Outlet/Anode
18 Heat Trap (Outlet)
35 Ultra Low NOx Burner
36 Main Burner Feedline
37 Main Burner Orifice
25
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