Bradford White RG130T N Series Service Manual page 16

OPEN CIRCUIT THERMOCOUPLE TESTING (White Rodgers Mechanical)
Disconnect the thermocouple from the
Step 1.
combination thermostat/gas valve.
Step 2. Using a multimeter capable of measuring millivolts,
connect one alligator clip to the end ball or contact
portion of the thermocouple and the other alligator clip
to copper portion of the thermocouple.
Following the lighting instruction label on the heater, proceed to light the pilot and allow to
Step 3.
operate for three minutes. It will be necessary to hold the pilot button down continuously
throughout this test. A reading of 20 to 30 millivolts indicates good thermocouple output.
THERMOCOUPLE REPLACEMENT (White Rodgers Mechanical)
Step 1. Turn off gas supply to the water heater. Rotate the knob of the
combination thermostat/gas valve to "OFF" position.
Step 2. Remove the outer jacket door.
Step 3. Remove the right side of inner door per Service Procedure RG-I, Steps 3a through 3c.
Step 4.
Disconnect the thermocouple from the combination thermostat/gas valve. Locate other end of the
thermocouple inside of the combustion chamber and remove from the pilot bracket. Pull firmly,
pulling away from the pilot assembly.
Install a new thermocouple into the pilot bracket making certain the thermocouple is fully engaged
Step 5.
into the pilot bracket. Position the thermocouple against the left side inner door flange at its original
position. Connect the other end of thermocouple to the combination thermostat/gas valve (finger
tight + a 1/4 turn).
Step 6. Inspect the inner door gasket per Service
Procedure RG-I, Step 4.
Install right side inner door per Service Procedure RG-I,
Step 7.
"Installation of Inner Door with Gasket," Step 6 through Step 8.
Step 8.
To resume operation, follow the instructions located on the lighting instruction label or the lighting
instructions located in the Installation and Operation Manual.
16
SERVICE PROCEDURE RG-II
Thermocouple/Thermopile Testing and
Depress knob slightly
and rotate clockwise to
the "OFF" position.
Thermocouple position
16
Replacement