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Table of Contents
- 1 Tools Required for Service
- 2 Burner Inspection
- 3 Burner Cleaning
- 4 Pilot Inspection, Testing and Replacement
- 5 Line Pressure
- 6 Determine Water Temperature Inside Tank
- 7 Chamber Sensor Testing
- 8 Igniter, Electrode Testing and Replacement
- 9 Resettable Thermal Switch Testing and Replacement
- 10 Diptube Inspection & Replacement
- 11 Anode Inspection & Replacement
- 12 Flue Baffle Inspection and Replacement
- 13 Screenlok ® Flame Arrestor Cleaning
- Download this manual
Flammable Vapor Ignition Resistant
Manual 238-51546-00B REV 10/18
Water Heaters
Ultra Low NOx Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
URG230T*N
URG240S*N
URG240T*N
URG250L*N
URG250H*N
URG250T*N
URG250S*N
URG130T*N
URG140T*N
URG150T*N
(*) Denotes Warranty Years
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Table of Contents
Related Manuals for Bradford White ECO-DEFENDER Series
Summary of Contents for Bradford White ECO-DEFENDER Series
- Page 1 Flammable Vapor Ignition Resistant Water Heaters Ultra Low NOx Gas Water Heaters SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: URG230T*N URG240S*N URG240T*N URG250L*N URG250H*N URG250T*N URG250S*N URG130T*N URG140T*N URG150T*N...
- Page 2 The Bradford White DEFENDER ® Safety System Ultra Low NOx Gas Water Heaters Page ED Service Procedure Introduction..........................4 How to Use This Manual ......................5 Tools Required for Service......................5 Troubleshooting .........................6 Burner Operation Inspection, Cleaning & Replacement............10 ED-I Pilot Inspection, Testing & Replacement.................12 ED-II Gas Control Testing &...
- Page 3 ECO Defender 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 FOR YOUR SAFETY the vicinity of this or any other appliance.
- Page 4 ECO Defender Series Introduction The Bradford White ECO-DEFENDER Safety System was designed to resist the ignition of flammable vapors that can occur outside of the water heater. In addition, the ECO-DEFENDER Safety System is designed to meet the stringent NOx emissions standards required in the South Coast Air Quality Management District (SCAQMD) Rule 1121.
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Page 5: Tools Required For Service
Contact the Bradford White technical support group immediately if diagnosis cannot be made using the methods described in this service manual. - Page 6 ECO Defender Series V1 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. LED Status Control Status Probable Cause Service Procedure If the pilot will not stay lit...
- Page 7 ECO Defender Series V1 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. LED Status Control Status Probable Cause Service Procedure Four flashes...
- Page 8 ECO Defender Series V2 Observe colored 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. LED Status Control Status Probable Cause Service Procedure If the pilot will not stay...
- Page 9 ECO Defender Series V2 Observe colored 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. LED Status Control Status Probable Cause Service Procedure Check water temperature...
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Page 10: Burner Inspection
ECO Defender 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: Water heater vent is less than the allowable vent length. - Page 11 ECO Defender Series Burner Cleaning (cont.) Step 8. Remove manifold mount from burner inner door by removing (2) ¼” hex drive screws. Step 9. Thoroughly inspect burner surface area and burner port area. Remove any loose debris using a stiff brush, compressed air and/or a shop vacuum.
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Page 12: Pilot Inspection, Testing And Replacement
ECO Defender Series Pilot Inspection, Testing and Replacement Step 1. Position gas control knob “OFF” position. Step 2. Turn off gas supply to water heater. Step 3. Remove outer jacket door and inner door per service procedure ED-X on page 21. Step 4. -
Page 13: Line Pressure
ECO Defender 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 14: Determine Water Temperature Inside Tank
ECO Defender Series Determine Water Temperature Inside Tank WARNING Stored water may be HOT WHEN PERFORMING THE FOLLOWING STEPS IN THIS PROCEDURE. Take necessary precaution to prevent personal injury. Step 1. Position gas control knob to the “OFF” position. Step 2. Draw approximately 4 gallons of water from the drain valve into a container and discard. - Page 15 ECO Defender Series Gas Control Removal from Water Heater Step 1. Rotate the gas control knob to 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 16: Chamber Sensor Testing
ECO Defender Series Chamber Sensor Testing Step 1. Rotate the gas control knob to the “OFF” position. Step 2. Disconnect the chamber sensor wire harness from the gas control. Step 3. Remove the chamber door temperature sensor from the right side inner door (Phillips screw driver). - Page 17 ECO Defender Series WARNING Closed Circuit Thermopile Testing 115 volt potential exposure. Use caution to avoid personal injury. Step 1. Closed circuit testing is the preferred method for testing the thermopile. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minutes.
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Page 18: Igniter, Electrode Testing And Replacement
ECO Defender Series Igniter, Electrode Testing and Replacement Step 1. Remove outer jacket door. Step 2. Repeatedly depress the igniter button while viewing the pilot through the sight glass. If a spark is present, the circuit is OK. If there is no spark, proceed to step 3. -
Page 19: Resettable Thermal Switch Testing And Replacement
ECO Defender Series Resettable Thermal Switch Testing and Replacement Step 1. Remove outer jacket door. Step 2. Disconnect white wire leads from the resettable thermal switch. Step 3. Using a multimeter capable of measuring continuity (Ohms), place one probe of the meter on one of the brass connection tabs of the resettable thermal switch, and the remaining probe on the other connection tab. - Page 20 ECO Defender Series Resettable Thermal Switch Testing and Replacement (cont.) Step 1. Rotate gas control knob to the “OFF” position. Step 2. Remove outer jacket door. Step 3. Disconnect wire leads from resettable thermal switch. Step 4. Remove (2) ¼” hex drive screws from the manifold mount.
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Page 21: Diptube Inspection & Replacement
ECO Defender 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. Rotate gas control knob to the “OFF”. Step 2. -
Page 22: Anode Inspection & Replacement
ECO Defender 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. Rotate the gas control knob to the “OFF” position. Step 1. - Page 23 ECO Defender Series Inner Door Removal Procedure Step 1. Rotate the gas control knob to the “OFF” position. Step 2. Remove outer jacket burner access door. Step 3. Disconnect chamber door temperature sensor wire harness from gas control. Step 4. Remove (2) ¼”...
- Page 24 ECO Defender Series 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 9. After inspection of inner door as noted in step 8, completely remove gasket and adhesive residue from right and left side inner doors as needed.
- Page 25 ECO Defender Series Installation of Inner Door with Gasket (cont.) Step 14. Firmly place right side inner door flange against the left side inner door flange and secure with (2) ¼” hex drive screws from step 5. DO NOT OVER TIGHTEN SCREWS.
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Page 26: Flue Baffle Inspection And Replacement
ED SERVICE PROCEDURE ECO Defender Series Flue Baffle Inspection & Flue Baffle Inspection and Replacement Step 1. Rotate the gas control knob to the “OFF” position. Step 2. Disconnect vent system from the exhaust adapter on top of the water heater. Step 3. -
Page 27: Screenlok ® Flame Arrestor Cleaning
ECO Defender Series ® ScreenLok Flame Arrestor Cleaning NOTICE Some models are not equipped with the ® ScreenLok Flame Arrestor. Step 1. Rotate the gas control knob to the “OFF” position. Step 2. Remove outer door. Step 3. Remove outer jacket door and inner door per service procedure ED-X on page Step 4. - Page 28 ECO Defender Series Glossary of Terms British Thermal Units Gallons per Minute Hertz Kilowatt hour Light Emitting Diode National Pipe Thread Ohm Homs s 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 29 ECO Defender Series Heat Trap Outlet 10. Main Burner Feedline 18. Main Burner Orifice Hot Water Outlet Anode 11. Resettable Thermal 19. Drain Valve T&P Valve Switch 20. Polymer Gas Control Draft Diverter 12. Main Burner 21. Outer Jacket Door Heat Trap Inlet 13.