Bradford-White UDH75T50FR'N User Manual

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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-DefenderSafety 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

Save this manual for future reference

The Bradford White

Ultra Low NOx Direct Vent Water Heaters

Table of Contents

 

Page

 

Service Procedure

Introduction

 

3

 

- - -

Trouble shooting Chart

4

- - -

Inner Door Gasket Removal, Inspection, Replacement and Installation

6

 

I

Thermopile Testing and Replacement

9

 

II

Pilot Assembly Inspection Cleaning and Replacement

10

 

III

Igniter, Electrode Testing and Replacement

11

 

IV

Honeywell Gas Control Testing, Disassembly, and Replacement

20

 

V

Burner Operation Inspection, Adjustment, Cleaning and Replacement

21

 

VI

Dip Tube and Anode Inspection and Replacement

23

 

VII

Generic Parts List

25

- - -

2

2

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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3

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 troubleshooting table below.

LED Status

Control Status

None (LED not on or

Pilot assembly is not lit

flashing

 

Green LED Indicator

Probable Cause

Service

Procedure

If the pilot will not stay

. lit replace pilot

Gas Control is not powered. Light pilot. assembly. If problem persists replace Gas Control.

One flash and three second pause

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 water temperature setting.

2.Water heater is satisfied and operating normally.

1. Adjust set point knob to desired setting.

Two quick flashes and a three second pause

LED on continuously (Solid)

Two flashes and three second pause

Four flashes and three second pause

Gas control is calling for heat (no fault).

Set point knob has been recently turned to the “OFF” position. Wait until LED goes out before attempting to relight

Weak pilot signal detected. System will reset when pilot flame is sufficient.

Excessive tank temperature. System must be reset.

Tank temperature below set point of thermostat.

Set point knob was turned to “OFF” position.

1.Thermopile failure

2.Unstable pilot

3.Pilot tube block or restricted.

1.Temperature sensor out of calibration

2.Faulty Gas Control

Normal operation.

LED will go out and the control will function normally when the pilot is lit.

1.See service procedure II

2.See service procedure III

3.See service procedure III

1.See service procedure V

2.See service procedure V

4

4

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 troubleshooting table below.

Green LED Indicator

LED Status

Control Status

Probable Cause

Service

Procedure

 

 

 

Five flashes and three second pause

Six flashes and three second pause

Seven flashes and three second pause

Eight flashes and three second pause

Thermostat/well sensor fault.

Water leak detected by accessory module.

Gas Control electronic fault detected.

Standing pilot remains on while set point knob is in “OFF” position.

1.Damage to the temperature sensor.

2.Temperature sensor resistance out of range.

Excessive amount of water in drain pan/water dam.

1.Control needs to be reset.

2.Control is wet or physically damaged.

Pilot valve stuck in open position.

1. See service procedure V

1.Check T&P valve

2.Check all water fittings.

3.Pressurize and leak test tank.

1.Reset Gas Control

2.Replace Gas Control.

Replace Gas Control.

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The Bradford White

SERVICE PROCEDURE I

Inner Door/Gasket Removal, Inspection

Replacement and Reinstallation

Inner Door Removal Procedure

Step 1. Rotate set point knob of the gas control to the “OFF” position.

Step 2. Turn off the gas supply to the water heater

Step 3. Remove the outer door.

Step 4. Remove the four (4) ¼” hex drive screws holding the right side inner door in place

Step 5. 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 on Left Side Inner Door

Step 6. 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. Disconnect the spark igniter wire from the gas control.

Step 8. Remove the burner assembly from the combustion chamber.

¼” Hex Drive Screws Right Side Inner Door

Step 9. Fully inspect burner and 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.

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The Bradford White

SERVICE PROCEDURE I

 

Inner Door/Gasket Removal, Inspection

 

Replacement and Reinstallation

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

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-inwasher to secure the right side of the burner door to the chamber. Use the ¼” hex drive screws with thebuilt-inwasher to secure the left side of the burner door in place.DO NOT OVER

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.

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 13, 15 and 16.

If a fastener connection is stripped, contact the manufacturer listed on the water heater rating plate.

Page 37

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The Bradford White

SERVICE PROCEDURE I

Inner Door/Gasket Removal, Inspection

Replacement and Reinstallation

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. Turn knob to pilot position and depress.

Step 2. 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. 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.

Step 5. 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

PILOT/ELECTRODE ASSEMBLY INSPECTION,

CLEANING AND REPLACEMENT

Step 1. Turn off gas supply to water heater. Rotate knob of gas control/gas valve

to “OFF” position.

For Honeywell Control, rotate knob counter-clockwiseto the “OFF” position.

Thermopile connections

Pilot tube

Step 2. Remove outer jacket door.

Step 3. 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 Disconnect igniter wire from gas control.

Step 6.

Remove pilot/electrode assembly from burner (¼”

Feedline nut

 

drive tool).

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.

Step 8. Inspect pilot orifice:

Primary air opening

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-Installburner assembly and right side inner door per SERVICE

Pilot orifice

 

PROCEDURE I, steps 9 through 19.

 

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. Remove outer jacket door.

Step 2. 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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The Bradford White

SERVICE PROCEDURE V

Gas Control

Testing, Disassembly & Replacement

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.

Gas Control

Valve Body

Backplate

Cover

 

 

Gas Control

Cover Screw

Piezo Igniter

 

Temperature

 

Sensor

 

Valve Body

Insertion Stick

 

Screw

 

 

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. Set the Gas Control to the “OFF” position.

Step 2. Remove pressure tap plug and install 1/8" NPT pipe, coupling, & pressure tap.

Gas Control shown in the “OFF” position

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 LP gas is: 10.0" ±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 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

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.

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.

Observe Green LED indicator.

N

Does error code 4 (four flash, three

 

second pause) continue?

 

Y

Temperature Sensor Testing

Following “Gas Control Disassembly/Reassembly” instructions, disassemble Gas Control to access temperature sensor.

With the temperature sensor still in the back plate, use a multimeter set to the Ohms setting, determine the resistance of temperature sensor

(see caution and photos above)

Using a multi-meterset 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).

Alternate the probe on the outside position to the opposite outside wire position (see photo on right).

Resume normal operation.

Once the temperature sensor resistance values are known, the

 

 

water temperature must also be known to determine if the

N

 

resistance values are correct. See next page to obtain water

Replace temperature

temperature.

 

sensor

Are temperature sensor resistance values correct?

 

 

 

Y

 

 

 

 

 

 

 

 

 

Replace Gas Control

 

 

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The Bradford White

SERVICE PROCEDURE V

Gas Control

Testing, Disassembly & Replacement

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. Set the Gas Control knob to the “OFF” position.

Step 2. Turn off inlet water supply to water heater.

Step 3. 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

0

1

 

2

3

 

4

5

6

7

 

8

 

9

 

40

26109

25400

24712

24045

 

 

23399

22771

22163

21573

21000

 

20445

 

50

19906

19383

18876

18383

 

 

17905

17440

16990

16553

16128

 

15715

 

60

15314

14925

14548

14180

 

 

13823

13477

13140

12812

12494

 

12185

 

70

11884

11592

11308

11032

 

 

10763

10502

10248

10000

9760

 

9526

 

80

9299

9078

8862

8653

 

 

8449

8250

8057

7869

7685

 

7507

 

90

7333

7165

7000

6839

 

 

6683

6531

6383

6238

6098

 

5961

 

100

5827

5697

5570

5446

 

 

5326

5208

5094

4982

4873

 

4767

 

110

4663

4562

4464

4368

 

 

4274

4183

4094

4006

3922

 

3839

 

120

3758

3679

3602

3527

 

 

3453

3382

3312

3244

3177

 

3112

 

130

3048

2986

2925

2866

 

 

2808

2752

2697

2643

2590

 

2538

 

140

2488

2439

2391

2344

 

 

2298

2253

2209

2166

2124

 

2083

 

150

2043

2004

1966

1928

 

 

1891

1856

1820

1786

1753

 

1720

 

160

1688

1656

1625

1595

 

 

1566

1537

1509

1481

1454

 

1427

 

170

1402

1376

1351

1327

 

 

1303

1280

1257

1235

1213

 

1191

 

180

1170

1150

1129

1110

 

 

1090

1071

1953

1035

1017

 

999

 

190

982

965

 

949

933

 

 

917

901

886

871

857

 

842

 

200

828

814

 

801

788

 

 

775

762

749

737

725

 

713

 

 

 

 

 

 

 

15

 

 

 

 

 

 

 

15

Gas Control
Testing, Disassembly & Replacement
Rotate knob counter-clockwise to the “OFF” posistion.
SERVICE PROCEDURE

The Bradford White

V

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.

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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The Bradford White

SERVICE PROCEDURE V

Gas Control

Testing, Disassembly & Replacement

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

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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

Insertion stick fully inserted into backplate

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 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.

Pull in this direction

Temperature sensor

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.

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The Bradford White

SERVICE PROCEDURE V

Gas Control

Testing, Disassembly & Replacement

GAS CONTROL REPLACEMENT

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.

Rotate knob counter-clockwiseto the “OFF” position.

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.

Pilot tube

White thermopile

wire

 

Igniter wire

Red gas control

Red thermopile

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.

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The Bradford White

SERVICE PROCEDURE VI

Burner Operation Inspection, Adjustment

Cleaning and Replacement

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. Remove burner and inner door assembly per SERVICE PROCEDURE I, steps 1 through 9.

Step 2. 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

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The Bradford White

SERVICE PROCEDURE VI

Burner Operation Inspection, Adjustment

Cleaning and Replacement

Step 4. Disconnect (unscrew) feedline from the main burner door.

Feedline

Step 5. 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. Reassemble burner.

Step 8. 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.

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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-clockwiseto 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. Disconnect inlet nipple from plumbing system.

Step 4 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-jetslocated near the bottom of the dip tube should be open and free of any blockage.Anti-siphonhole 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. 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.

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.

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The Bradford White

SERVICE PROCEDURE VII

Dip Tube and Anode

Inspection and Replacement

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-clockwiseto 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. Disconnect outlet nipple from plumbing system.

Step 4 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. 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.

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.

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The Bradford White

Generic Parts List

1

Vent Package

19

T&P Relief Valve

2

Air Intake Terminal

20

¾” NPT Tank Plug (UDH Models)

3

Outer Wall Mounting Plate

21

Feedline Spring Clip

4

Backing Plate

22

Air Intake Boot

5

Telescopic Air Intake Tube

23

Air Intake Boot Gasket

6

Telescopic Vent Tube

24

Complete Right Side Inner Door

7

Intake Elbow

25

Screw-#10-12x ¾ Hex Washer Head

8

Exhaust Elbow

26

Screw-#8-18x ¾ Hex Washer Head

9

Plenum

27

Brass Drain Valve

10

Flue Reducer

28

Outer Door

11

Plenum Gasket

29

Gas Control

12

Air Intake Tube

30

Inner Door Gasket Kit

13

Air Intake Terminal Guard (Optional)

31

Heat Trap Kit

14

Flue Baffle

32

ASSE Approved Mixing Valve (Optional)

15

Heat Trap (Inlet)

33

Ultra Low NOx Burner Assembly

16

Cold Water Inlet Tube

34

Pilot Assembly

17

Hot Water Outlet/Anode

35

Ultra Low NOx Burner

18

Heat Trap (Outlet)

36

Main Burner Feedline

 

 

37

Main Burner Orifice

 

 

25

 

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