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Ultra Low NOx Direct Vent Water Heaters
Manual 238‐51635‐00A 3/15
UDV Series
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
URG2DV40S*N
URG2DV50S*N
URG2DV50H*N
ULG2DV50H50*N
(*) Denotes Warranty Years
Save this manual for future reference
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Summary of Contents for Bradford White URG2DV40S*N
- Page 1 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: URG2DV40S*N URG2DV50S*N URG2DV50H*N ULG2DV50H50*N (*) Denotes Warranty Years Manual 238‐51635‐00A 3/15 Save this manual for future reference...
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Page 2: Table Of Contents
The Bradford White UDV Series Ultra Low NO Direct Vent Water Heaters Table of Contents Page UDV SVC Procedure Introduction ..........................4 How to Use This Manual ......................5 Tools Required for Service ....................... 5 Troubleshooting ......................... 6 Burner Inspection, Cleaning & Replacement ................. 8 Pilot Testing, Cleaning &... - Page 3 UDV Series WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, DANGER personal injury, or death. Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance.
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Page 4: Introduction
UDV Series Introduction The new Bradford White UDV 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 NO emissions. -
Page 5: Tools Required For Service
In some difficult to diagnose conditions, it may be necessary to isolate the heater from the vent system to determine the problem. Contact the Bradford White technical support group immediately if diagnosis cannot be made using the methods described in this service manual. -
Page 6: Troubleshooting
UDV Series 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. Probable Service LED Status Control Status Cause Procedure If the pilot will not stay... - Page 7 UDV Series Service Control Status Probable Cause Status Procedure 1. Damage to the Five flashes Temperature sensor temperature sensor. and three See service procedure III fault. 2. Temperature sensor second pause resistance out of range. 1. Check T&P valve Six flashes 2.
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Page 8: Burner Inspection, Cleaning & Replacement
UDV Series 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. - Page 9 UDV Series Burner Cleaning (cont.) Step 9. Thoroughly inspect the burner surface area and the burner port area and remove any loose debris. Step 10. Unscrew the burner feedline from the main burner inner door. Step 11. Remove the main burner orifice from the feedline (1/2”...
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Page 10: Pilot Testing, Cleaning & Replacement
UDV Series Remove Burner to Gain Access to the Pilot Step 1. Position the gas control knob in the “OFF” position. Step 2. Turn off the gas supply to the water heater. Step 3. Remove the outer jacket door and inner doors per service procedure VI on page 17. - Page 11 UDV Series Pilot Inspection, Testing and Replacement Step 1. Remove the pilot assembly from the burner (1/4” nut driver). Step 2. Visually inspect the igniter wire for damage. Replace pilot if damaged. Electrode should not be in contact with the pilot hood.
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Page 12: Gas Control Testing & Replacement
UDV Series 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. -
Page 13: Determine Water Temperature Inside Tank
UDV Series ECO (Energy Cut Out) The Honeywell gas control is designed with an ECO device that will reset. To reset the gas control after an 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. - Page 14 UDV Series Gas Control Removal From Water Heater Step 1. Position the gas control knob in the “OFF” position. 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.
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Page 15: Thermopile Testing
UDV Series Closed Circuit Thermopile Testing Closed circuit thermopile testing is the preferred method for testing the thermopile. Step 1. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minutes. If the pilot will not stay lit, hold the pilot button (rotate the gas control knob to the pilot position, push and hold in) during... -
Page 16: Igniter, Electrode Testing And Replacement
UDV Series Igniter, Electrode Testing and Replacement Step 1. Remove the outer jacket door. Step 2. Repeatedly depress the igniter button while viewing the pilot through the flame viewing window. If a spark is present, the circuit is OK. If there is no spark, proceed to step 3. Step 3. -
Page 17: Inner Door Removal And Replacement
UDV Series Inner Door Removal Procedure Step 1. Position the gas control knob in the “OFF” position. Step 2. Remove the outer jacket burner access door. Step 3. Remove the wire clip from the feedline if present. Step 4. Remove (2) ¼” hex drive screws from the right side inner door. Step 5. - Page 18 UDV Series Inner Door Gasket Replacement Procedure (cont.) Step 10. Use RTV sealant (recommended bead size 1/8”) to secure the inner door gasket to the inner door sections (right & left). Refer to the illustrations on the next page for proper application.
- Page 19 UDV Series Installation of Inner Door with Gasket (cont.) Step 15. 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”...
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Page 20: Diptube Inspection & Replacement
UDV Series Diptube Inspection & Replacement 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. Step 1. Position the gas control knob in the “OFF” position. Step 2. -
Page 21: Anode Inspection & Replacement
UDV Series Anode Inspection & Replacement 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. Step 1. Position the gas control knob in the “OFF” position. Step 2. -
Page 22: Glossary Of Terms
UDV Series Glossary of Terms British Thermal Units Gallons per Minute Hertz kWhr Kilowatt Hour Light Emitting Diode National Pipe Thread Ohms Ohms of resistance Pounds per Square Inch Revolutions per minute Energy Cut Out Volts Alternating Current “ W.C. Inches of Water Column ºC Degrees Centigrade... - Page 23 PV Series 1. Venting Package 10. Heat Trap Inlet 20. Main Burner Orifice Complete 11. Inlet Diptube 21. Feedline Clip 2. Venting Protection 12. T&P Valve 22. Right Side Inner Door Screen 13. ¾ NPT Plug (“H” Models 23. Outer Door 3.