Bradford White RG130T*N Series Service Manual page 18

SERVICE PROCEDURE RG-V
Gas Valve Testing and Replacement
(White Rodgers)
THERMOCOUPLE TESTING
See SERVICE PROCEDURE RG-II
MAGNET ASSEMBLY TESTING (White Rodgers Control)
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 (located on the gas valve) down
during this test.
Step 2. Using a multimeter capable of measuring millivolts, connect one lead using an alligator clip to the
copper sheath of the thermocouple, use the second lead of the multimeter to probe the top
terminal located at the back of the gas valve.
With a meter reading of 13 millivolts or greater, rotate knob of combination thermostat/gas valve to
Step 3.
the "OFF" position.
Step 4. The magnet should remain closed for a drop of at least 6 millivolts. You will hear a "snap" or "click"
sound when the magnet opens, if you hear this sound prior to a drop of 6 millivolts, the magnet is
out of specification and the gas valve should be replaced.
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.
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