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 (*) Denotes Warranty Years Manual 238-51546-00B REV 10/18 Save this manual for future reference
The Bradford White ECO 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...........................................................................................
ECO Defender Series WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. FOR YOUR SAFETY Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance. WHAT TO DO IF YOU SMELL GAS! x Do not try to light any appliance. x Do not touch any electrical switch; do not use any phone in your building.
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. Use and installation are nearly identical to previous versions of atmospherically fired and vented water heaters.
ECO Defender Series It is intended for this manual to be used by qualified service personnel for the primary purpose of troubleshooting and repair of the Bradford White ECO-DEFENDER Series water heaters. The Honeywell WV8860 Gas Control will display status codes in the event of abnormal operation. Status codes are listed in the troubleshooting chart beginning on page 6 of this service manual.
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 replace pilot assembly. If problem persists, replace gas control. None (LED not on or flashing) Pilot assembly is not lit Gas control is not powered. Light Pilot.
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 Four flashes three second pause Control Status Excessive tank temperature. System must be reset. Probable Cause 1. Temperature sensor out of calibration. 2. Faulty gas control. 1. Damage to the temperature sensor. 2. Temperature sensor resistance out of range.
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 None (LED not on or flashing) Control Status Millivolt power is not present. Light pilot. Probable Cause Gas valve is functioning normally. Gas valve is not powered. Light pilot. One flash every Not an error.
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 Check water temperature sensor and its connection for open circuits, shorts, or differences in resistance between the two sensor elements. Check door temperature sensor and its connection for open circuits or shorts.
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: a) b) c) Water heater vent is less than the allowable vent length. Gas pressure is out of specification. Pilot flame not fully engulfing spark/flame sensor.
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. Step 10. Unscrew main burner orifice and feedline from manifold mount. Remove main burner orifice from feedline (1/2” wrench) inspect orifice, clean or replace if necessary. Step 11.
ECO Defender Series Pilot Inspection, Testing and Replacement Step 1. Step 2. Step 3. Position gas control knob “OFF” position. Turn off gas supply to water heater. Remove outer jacket door and inner door per service procedure ED-X on page 21. Step 4. Disconnect pilot tubing nut (7/16” wrench) and feedline nut (3/4” wrench) from gas control. Step 5. Disconnect igniter/flame sense wire from gas control. Step 6. Disconnect wire connections to the resettable thermal switch. Step 7.
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. Manifold Pressure Testing (this procedure presumes a maximum line pressure of 14.0” w.c.) Step 1. Set the gas control knob to the “OFF” position. Step 2.
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.
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. Step 4. Disconnect wire harnesses from the gas control. Step 5. Remove the outer jacket burner access door. Step 6. Disconnect main burner feedline, swing counter-clockwise away from gas control. Step 7.
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). Step 4. Make sure that the ring terminal of the chamber door temperature sensor is not touching any surface.
ECO Defender Series Closed Circuit Thermopile Testing WARNING 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. 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 this test. Step 2.
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. Step 3. Remove white wire from igniter. Hold the igniter lead from the gas control to an unpainted surface such as the feedline or gas control and depress the igniter.
ECO Defender Series Resettable Thermal Switch Testing and Replacement Step 1. Step 2. Step 3. Step 4. Step 5. Remove outer jacket door. Disconnect white wire leads from the resettable thermal switch. 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. If continuity is indicated, the switch is closed, allowing millivolt current to pass.
ECO Defender Series Resettable Thermal Switch Testing and Replacement (cont.) Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Step 7. Rotate gas control knob to the “OFF” position. Remove outer jacket door. Disconnect wire leads from resettable thermal switch. Remove (2) ¼” hex drive screws from the manifold mount. Remove resettable thermal switch from manifold mount (Phillips screw driver). Place new resettable thermal switch in place.
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. Turn off the cold-water supply to the water heater. Connect the hose to the drain valve of the water heater and route it to an open drain. Open a nearby hot water faucet to vent the water heater for draining.
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. Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Step 7. Rotate the gas control knob to the “OFF” position. Turn off the cold-water supply to the water heater. Connect a hose to the drain valve of the water heater and route it to an open drain.
ECO Defender Series Inner Door Removal Procedure Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Step 7. Rotate the gas control knob to the “OFF” position. Remove outer jacket burner access door. Disconnect chamber door temperature sensor wire harness from gas control. Remove (2) ¼” hex drive screws from right side inner door. Remove (2) ¼” drive screws from flange section of inner door. Remove (2) ¼” drive screws from left side inner door. Remove inner door and inspect per step 8. Step 8.
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. Step 10. Use RTV sealant (recommended bead size 1/8”) to secure the inner door gasket to the inner door sections (right & left).
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. 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.
ECO Defender Series ED SERVICE PROCEDURE XI 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. Remove the draft diverter on top of the water heater. Step 4. Remove the flue baffle from the heater (see photo A below). Step 5. Inspect baffle for deterioration, missing restrictors. Clean any scale or debris build up.
ECO Defender Series ScreenLok® Flame Arrestor Cleaning NOTICE Some models are not equipped with the ® ScreenLok Flame Arrestor. Step 1. Step 2. Step 3. Rotate the gas control knob to the “OFF” position. Remove outer door. Remove outer jacket door and inner door per service procedure ED-X on page 24. Disconnect main burner feedline (3/4” wrench), pilot tube (7/16” wrench) and igniter/flame sensor wire from gas control and remove burner assembly from combustion chamber.
ECO Defender Series Glossary of Terms BTU GPM Hz kWh LED NPT Homs PSI RPM ECO VAC “w.c.
ECO Defender Series Heat Trap Outlet Hot Water Outlet Anode T&P Valve Draft Diverter Heat Trap Inlet Flue Baffle Inlet Diptube ¾ NPT Plug (“H” Models only) 9. Burner Ass’y complete 1. 2. 3. 4. 5. 6. 7. 8. 10. Main Burner Feedline 11. Resettable Thermal Switch 12. Main Burner 13. Pilot Assembly 14. Pilot Orifice 15. Right Side Inner Door Ass’y 16. Thermal Switch Harness 17. Manifold Mount 18. Main Burner Orifice 19. Drain Valve 20. Polymer Gas Control 21. Outer Jacket Door 22. Inner Door Gasket Kit 23.
