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CLEANING and MAINTENANCE
10 L20-258-UK Rev.01 8/16/04
Thermostat Calibration Check
NOTICE
Thermostat calibration requires that the temperature of the appliance be raised above
boiling. If you have water in the tank you will need to drain it, dry it and fill it with
shortening/oil. Follow the filling instructions in this manual.
To check the calibration of your appliance, refer to the following procedure.
a. Remove the element screen from the tank.
b. Place the tip of a digital thermometer probe into the shortening/oil approximately one inch
above the temperature sensor.
c. Perform the appliance startup as described in this manual, set the thermostat to 325°F
(163 °C) and allow the shortening/oil to come up to temperature. Watch the thermometer
closely as the temperature rises.
d. If the shortening/oil temperature reaches 350°F (177 °C) and the elements do not turn
off, turn the thermostat down. Keep lowering the thermostat setting until the elements
turn off.
CAUTION
If the elements do not shut off at the LOWEST thermostat setting, the thermostat may be
defective. Contact your local service company.
e. Let the appliance cycle 4 to 6 times before checking the temperature. Compare the
thermometer temperature against the thermostat setting. If the values are more than 5°F
(3 °C) apart, calibrate the thermostat using procedure in this manual.
Thermostat Calibration
For Electric Thermostats refer to the following procedure.
a. Remove the element screen from the tank and place the tip of a digital thermometer into the
shortening approximately one inch above the temperature sensor.
b. Perform the appliance startup as described in this manual, set the thermostat to 325°F (163 °C)
and allow the shortening/oil to come up to temperature; let the appliance cycle 4-6 times to
insure that the oil temperature has stabilized. Compare the thermostat setting of 325°F (163 °C)
to the digital thermometer reading.
c. Remove the thermostat dial by pulling the knob straight out. DO NOT rotate the dial.
d. Holding the outside of the shaft so that it does not move, scrape away the sealing compound in
the center of the shaft with a small flat blade screwdriver.
e. Turn the adjustment screw clockwise to lower the thermostat’s temperature setting or counter-
clockwise to raise it.
NOTE
One-quarter turn of the adjustment screw changes the temperature setting
approximately 24°F (13 °C).
f. Turn the adjustment screw until the elements energize at 325°F (163 °C).
g. Replace the knob and allow the appliance to cycle 4 to 6 times. Check the temperature of the
digital thermometer against the thermostat dial setting; if there is greater than a 5°F (3 °C)
difference, repeat the calibration procedure.