4-3
h. Use pipe joint compound on the large fitting before installing to prevent oil leakage. DO
NOT use joint compound on the small nut.
i. Perform the calibration procedures detailed in section 1.5.3.
4.1.3 Calibrating the Thermostat - Computer Models Only
To calibrate this thermostat the dial must be removed from the shaft. The adjustment for the
thermostat is inside the dial shaft.
a. To calibrate the thermostat you must first cause the computer to switch control to the
backup thermostat. To do this, remove the computer from the front panel and disconnect
the connector from the computer. The transfer relay will de-energize and temperature
control will shift to the backup thermostat.
b. Place the tip of a high accuracy thermometer in the shortening approximately 1" above
the temperature sensor.
c. Set the thermostat dial to 325°F and turn the fryer on.
d. Remove the thermostat dial by pulling the knob straight out. DO NOT rotate the dial.
e. Hold the outside of the shaft so it does not move. Use the tip of a small, flat tip screw
driver to scrape away the sealing compound from the adjustment screw. Turn the
adjustment screw clockwise to lower the temperature setting, and counterclockwise to
raise the temperature. One quarter turn will change the temperature approximately 25°F.
f. Turn the adjustment until the heating elements turn off at 325°F. Replace the knob and
allow the fryer to cycle 4 to 6 times. Check the temperature of the thermometer against
the thermostat dial, if it is greater than 5°F repeat the calibration procedure.
g. When the calibration is correct, remove the thermometer.
4.2 TESTING CONTACTORS (RELAYS)
Contactors and relays use a control voltage to energize the electro magnet and close a set of contacts.
The control voltage is applied to a solenoid-type coil. When measuring a coil's resistance, ensure that
you have disconnected it from the fryer's electrical system. This will ensure that you are measuring
the coil's resistance and not a portion of the fryer's wiring. When measured with an OHM meter these
coils should have a very low resistance, less than 100 ohms. Measure each of the contactors that are
suspect. If any relay or contactor indicates an open circuit or high amount of resistance, replace the
coil.
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