Regulator Check - Vulcan-Hart MG12 Service Manual

8. To recalibrate, hold the thermostat dial in place. Insert screwdriver into dial shaft to engage the
calibration stem adjustment screw (Fig. 8). Push inward (do not turn stem).
9. While holding stem calibration screw in place, turn thermostat dial until it is set on the actual
temperature shown by the testing device.
10. Release the calibration screw and reinstall the dial insert.
11. Set the dial to 450 F and recheck temperature reading every 5 minutes over a 15-minute period.
If calibration is not within 15 F of the dial setting, the thermostat must be replaced.

REGULATOR CHECK

A regulator is installed on each range. When servicing this equipment for possible gas pressure
problems, make the following visual checks first.
Make sure the regulator has been installed at the rear of the range with arrow pointing in the horizontal
position in the direction of gas flow. The only exception to this rule is if the outlet pressure of the range
has been reset prior to this service call.
Then turn on the top burners. Observe the burner flames. If you notice the flames fluctuating, perform
the following procedures.
Gas supply pressure must not be greater than
installed utilizing an individual gas line shutoff valve. The range and its individual shutoff valve must
be disconnected from the gas supply piping system during any pressure testing of that system at test
pressures in excess of
piping system by closing its individual manual shutoff valve during any pressure testing of the gas
supply piping system at test pressures equal to or less than
American National Standard Z83.11 (latest edition). Copies of this standard are available from The
American Gas Association, 1515 Wilson Blvd., Arlington, Virginia 22209.
1
⁄ psig (3.45 kPa). In addition, the range must be isolated from the gas supply
2
Fig. 8
1 ⁄ psig (14" Water Column). All ranges should be
2
1
⁄ psig (3.45 kPa), as stated by the
2
– 12 –