Bradford White UDH Series Bedienungsanleitung

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Manual 238-49640-00A

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

Ultra Low NOx Direct Vent Water Heaters

UDS / UDH Series

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 - - -

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.

INTRODUCTION

Honeywell Gas Control Troubleshooting Chart

LED Status Control Status Probable Cause

None (LED not on or

flashing Pilot assembly is not lit

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.

One flash and three

second pause

Two quick flashes

and a three second

pause

Gas control is calling for heat (no

fault).

Two flashes and

three second pause

Weak pilot signal detected. System will

reset when pilot flame is sufficient.

Gas Control is not powered. Light pilot.

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.

Tank temperature below set point of

thermostat.

1. Thermopile failure

2. Unstable pilot

3. Pilot tube block or restricted.

Service

Procedure

If the pilot will not stay

lit replace pilot

assembly. If problem

persists replace Gas

Control.

1. Adjust set point knob

to desired setting.

Normal operation.

1. See service

procedure II

2. See service

procedure III

3. See service

procedure III

Flammable Vapor Ignition Resistant Water

Heaters

Green LED Indicator

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.

Four flashes and

three second pause

Excessive tank temperature. System

must be reset.

1. Temperature sensor out of

calibration

2. Faulty Gas Control

1. See service

procedure V

2. See service

procedure V

LED on continuously

(Solid)

Set point knob has been recently

turned to the “OFF” position. Wait

until LED goes out before

attempting to relight

Set point knob was turned to “OFF”

position.

LED will go out and the

control will function

normally when the pilot

is lit.

Honeywell Gas Control Troubleshooting Chart

LED Status Control Status Probable Cause

Five flashes and

three second pause Thermostat/well sensor fault.

Gas Control electronic fault detected.

Seven flashes and

three second pause

Eight flashes and

three second pause

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.

1. Control needs to be reset.

2. Control is wet or physically

damaged.

Pilot valve stuck in open position.

Service

Procedure

1. See service

procedure V

1. Reset Gas Control

2. Replace Gas

Control.

Replace Gas Control.

Flammable Vapor Ignition Resistant Water

Heaters

Green LED Indicator

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.

Water leak detected by accessory

module.

Six flashes and

three second pause

Excessive amount of water in drain

pan/water dam.

1. Check T&P valve

2. Check all water

fittings.

3. Pressurize and leak

test tank.

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.

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.

tep 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.

¼” Hex Drive Screws Right

Side Inner Door

¼” Hex Drive Screws at Flange

Area of Inner Door

¼” Hex Drive Screws on Left

Side Inner Door

SERVICE PROCEDURE I

Inner Door/Gasket Removal, Inspection

Replacement and Reinstallation

Page 37

Installation of Inner Door With

Gasket.

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.

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-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

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.

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.

The Bradford White

SERVICE PROCEDURE I

Inner Door/Gasket Removal, Inspection

Replacement and Reinstallation

The Bradford White

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.

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.

Verify threaded hole

alignment with slotted

openings in inner door.

Position fiberglass sock, pilot

tube and armored thermopile

cable against flange.

Secure flange with

¼" drive screws.

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.

OPEN CIRCUIT THERMOPILE TESTING

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.

SERVICE PROCEDURE II

Thermopile Testing and Replacement

Red gas control wire

Red (+) thermopile wire

White (-) thermopile wire

Red (+) thermopile wire

The Bradford White

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.

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”

drive tool).

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:

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.

Step 11. To resume operation follow the instructions located on the lighting instruction label or the lighting instruction

located in the installation and operation manual.

Primary air

opening

Pilot orifice

SERVICE PROCEDURE III

Pilot Assembly Inspection, Cleaning

and Replacement

For Honeywell Control, rotate knob

counter-clockwise to the “OFF”

position.

Feedline nut

Igniter wire

Pilot tube

Thermopile

connections

The Bradford White

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