Henny Penny 500 Service Manual page 87

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The thermostat bulb is connected to the thermostat by a
thin capillary tube. en the temperature rises, the
fluid inside the bulb expands (as in a thermometer) and
pushes fluid through the tube into the control panel
thermostat. When the frypot temperature is lower than
the thermostat setting, the TElWP light is illuminated
and frypot is being heated. When the temperature set-
ting is reached, a switch inside the thermostat opens
the circuit to the heat source and turns off the TEMP
light. When the frypot starts to cool, the switch closes
the circuit to the heat source.
This interlock provides protection for the frypot in the
event an operator inadvertently drains the shortening
with the switch in the power position. The heat will
automatically shut off when the drain valve is opened.
The high limit control is mounted and connected in
different places on different fryer models. However, in
all models it provides the safety feature of interrupting
the heat if the temperature ever exceeds the safe
i operating limits. On electric models it must be manually
~ reset when the frypot cools. Refer to paragraph 5-12 or
~ 5-13 for maintenance of the high limit switch.