Bradford White MI30T Service Manual page 17

ECO (Energy Cut Off) TESTING
Step 1. Disconnect thermocouple from 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
gas valve must be replaced.
COMBINATION THERMOSTAT/GAS VALVE REPLACEMENT
Step 1. Rotate knob of the gas valve to the "OFF" position.
Step 2. Turn off gas supply to water heater.
Step 3. Disconnect gas supply line from gas valve.
Step 4. Turn off water supply and drain water heater completely.
Step 5. Remove outer jacket burner access door.
Step 6. Right side inner door removal.
a) Disconnect resettable thermal switch wire leads (leading from gas valve)
and remove wire tie from feedline.
b) Remove (2) hex drive screws from right side inner door.
c) Remove (2) hex drive screws from flange section of inner door.
d) Remove right side inner door and set aside. Be careful not to damage gasket material on inner door.
Remove
Wire Tie
SERVICE PROCEDURE RG-V
Gas Valve
Testing and Replacement (White Rodgers/Robertshaw)
For White Rodgers Control,
depress knob slightly and rotate
clockwise to the "OFF" position.
For Robertshaw Control, rotate
knob clockwise to the "OFF"
position.
Resettable Thermal Switch
Wire Connection
Hex Drive Screws shown on
Right Side Inner Door.
Hex Drive Screws at
Flange section of Inner Door
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