Bradford-White Corp 55X80B*N, MI75S*(BN, GX155S*BN, GX225S*BN, MI100T*(BN ECO Energy Cut Off Testing

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SERVICE PROCEDURE AG-III

Combination Thermostat/Gas Valve

Testing and Replacement

ECO (Energy Cut Off) TESTING

Step 1. Disconnect thermocouple from combination thermostat/gas valve.

Step 2. Using a multimeter capable of measuring Ohms (or continuity), attach one lead (alligator clip) to the pilot tube. Insert the other lead (probe) fully into the magnet opening, Be sure the probe makes contact only at the top center of the magnet opening. Do not allow the probe to make contact with the threaded sides of the opening.

Step 3. If continuity is indicated, the ECO is OK. If continuity is not indicated, the ECO has opened and the combination thermostat/gas valve must be replaced.

COMBINATION THERMOSTAT/GAS VALVE REPLACEMENT

Step 1. Rotate knob of the combination thermostat/gas valve to the “OFF” position.

Step 2. Turn off gas supply to water heater.

Step 3. Disconnect gas supply line from combination thermostat/gas valve.

Step 4. Turn off water supply and drain water heater completely. Step 5. Remove outer jacket burner access door.

Step 6. Slide open inner combustion chamber door.

For White Rodgers Control, depress knob slightly and rotate clockwise to the “OFF” position.

For Robertshaw Control, rotate knob clockwise to the “OFF” position.

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Contents Service Manual Table of Contents Troubleshooting Chart Open Circuit Thermocouple Testing Thermocouple ReplacementPilot Assembly INSPECTION, Cleaning and Replacement Feedline Nut Pilot OrificeCombination Thermostat/Gas Valve Testing and Replacement Line PressureMagnet Assembly Testing Robertshaw Control Thermocouple TestingMagnet Assembly Testing White Rodgers Control ECO Energy Cut Off Testing Combination THERMOSTAT/GAS Valve ReplacementService Procedure AG-III Main Burner Inspection, Adjustment Cleaning and Replacement Cast Iron Burner AdjustmentBurner Venturi Opening Feedline Burner Cleaning DIP Tube Inspection and Replacement Anode Inspection and Replacement Page Fax/215-641-1612

M1XR65T*(BN, MI75S*(BN, M2XR75S*(BN, GX155S*BN, 65T65*(BN specifications

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