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Ultra Low NOx Direct Vent Water Heaters
Manual 238-49640-00A
UDS / UDH Series
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
UDS140S*FRN
UDS150S*FRN
UDH1504T*FRN
UDH165T*FRN
UDH175S*FRN
UDH50T45FR*N
UDH65T45FR*N
UDH75T50FR*N
(*) Denotes Warranty Years
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Related Manuals for Bradford White UDH Series
Summary of Contents for Bradford White UDH Series
- Page 1 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...
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Page 2: Table Of Contents
The Bradford White Ultra Low NOx Direct Vent Water Heaters Table of Contents Page Service Procedure Introduction - - - Trouble shooting Chart - - - Inner Door Gasket Removal, Inspection, Replacement and Installation Thermopile Testing and Replacement Pilot Assembly Inspection Cleaning and Replacement Igniter, Electrode Testing and Replacement Honeywell Gas Control Testing, Disassembly, and Replacement Burner Operation Inspection, Adjustment, Cleaning and Replacement... -
Page 3: Introduction
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. - Page 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 Green LED Indicator troubleshooting table below.
- Page 5 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.
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Page 6: Inner Door Gasket Removal, Inspection, Replacement And Installation
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. - Page 7 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.
- Page 8 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.
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Page 9: Thermopile Testing And Replacement
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. -
Page 10: Pilot Assembly Inspection Cleaning And Replacement
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 of gas control/gas valve connections to “OFF”... -
Page 11: Igniter, Electrode Testing And Replacement
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. -
Page 12: Honeywell Gas Control Testing, Disassembly, And Replacement
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. - Page 13 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"...
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Page 14: Gas Control
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 If Control has gone into lockout due to excessive tank temperature (four flash, three second pause) reset electronic probes or small diameter wire pins inserted control by rotating gas control knob to “OFF”... - Page 15 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 It is important to understand once the resistance for the temperature sensor is determined from the Note: previous page, water flow through the water heater should not occur.
- Page 16 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. Rotate knob counter-clockwise to Step 4.
- Page 17 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.
- Page 18 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.
- Page 19 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.
- Page 20 SERVICE PROCEDURE V The Bradford White Gas Control Testing, Disassembly & Replacement GAS CONTROL REPLACEMENT Step 1. Rotate knob of the gas control Rotate knob counter-clockwise to to the “OFF” position. the “OFF” position. Step 2. Turn off gas supply to water heater. Step 3.
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Page 21: Burner Operation Inspection, Adjustment Cleaning And Replacement
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. - Page 22 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.
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Page 23: Dip Tube And Anode Inspection And Replacement
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. - Page 24 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.
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Page 25: Generic Parts List
The Bradford White Generic Parts List Vent Package 19 T&P Relief Valve Air Intake Terminal 20 ¾” NPT Tank Plug (UDH Models) Outer Wall Mounting Plate 21 Feedline Spring Clip Backing Plate 22 Air Intake Boot Telescopic Air Intake Tube 23 Air Intake Boot Gasket Telescopic Vent Tube 24 Complete Right Side Inner Door...