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Gas Kettle
Gas Pressure Regulator
The gas pressure regulator is an integral part of the combination gas control located just behind the lower front access
door. The pressure regulator adjustment is on the lower right side of the gas control. The large slotted cap must be
removed to access the adjustment screw.
Adjustments
To check the manifold pressure a pressure gauge (manometer) must be connected to the 1/8" NPT pressure tap
on the gas manifold. With the gas off, connect your pressure indicating instrument to the manifold with a fitting
appropriate for your instrument.
1. Turn the unit on; with main burners on, read the manifold pressure. The pressure should be 4 inches water
column (W.C.) (±) .2 inches W.C. for natural gas or 10 inches W.C. for propane gas. Adjust the pressure
regulator to obtain the appropriate pressure. Check serial plate on lower right side of unit to confirm exact gas
type and manifold pressure for your unit.
When pressure has been correctly adjusted turn unit off. Remove pressure indicating instrument and replace the
1/8" NPT plug in manifold. Replace regulator cap and close access door.
Thermostat
The thermostat adjustment should not be changed. Check the following before changing the thermostat:
1. With kettle cool, the pressure reading on the pressure gauge should be in the green vacuum zone (below 0 psi). If not,
see "Re-establishing Vacuum" section.
2. Check that the pressure switch is not set too high or too low and causing the out of adjustment condition. A voltmeter
should be used by a properly trained serviceman to determine if the pressure switch or thermostat is actually cycling
the burners. If the pressure switch is found to be the problem, see "Pressure Switch" section.
After verifying that the pressure switch is set and operating properly, the thermostat may be adjusted using the set screw
inside the stem. The thermostat should cycle off at a gauge pressure reading of 30 psi. Turn set screw clockwise to
decrease pressure and counterclockwise to increase pressure.
Pressure Switch
The pressure switch should not be adjusted until it is determined to be the cause of an operating pressure deficiency. See
"Thermostat" section to determine if the source of difficulty is the pressure switch or thermostat.
The major difficulties caused by pressure switch mis-adjustment are:
1. Pressure relief valve opening, especially on preheat from a cold start to 275 degrees Fahrenheit (135̊ C ) (pressure
switch set too high).
2. Burners are being shut down by pressure switch, not the thermostat. (Pressure switch set too low.)
The pressure switch is preset for proper operation from the factory. It is adjusted to the maximum pressure, however
not high enough to cause the pressure relief valve to open. This setting will be slightly different on different kettles due
to variations in the pressure relief valves. During preheat to the maximum thermostat setting (275 degrees Fahrenheit)
(135̊ C ), from either a cold condition or a lower temperature setting, the temperature may overshoot the thermostat setting
and shut down the burners by the pressure switch. This is normal, however, after the kettle cycles several times (empty)
the thermostat will begin cycling the unit.
INSTALLATION & OPERATION MANUAL 10156 REV 3 (08/22)
Service
17
PAGE
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