CHAPTER 6: OPERATING INSTRUCTIONS
6-4
6.6 Testing Dual Hi-Limit Controls
Note: Perform this test before replacing old shortening. This high temperature test will greatly
reduce life of new shortening. Start test with the fryer turned ON and with the oil at normal
frying temperature. Stir the oil thoroughly to ensure even distribution and temperature and
place a pyrometer sensing probe in center of frypot about one-inch deep. When verifying oil
temperature, use a pyrometer indicating 0-600
0
F and a pryometer sensor probe. A high
temperature thermometer may be used instead of a pyrometer.
CAUTION
If the result listed for each step does not occur, turn off fryer at the main circuit breaker panel and do
not use the fryer. Call service agency.
To test the high limit thermostats, proceed as follows:
STEP 1: Press the hi-limit test switch to the 1
st
hi-limit switch and hold in that position until the
trouble light comes on. The trouble light should come in between 410
0
F + or - 3
0
F, and
the heating elements must shut off. The HEAT light goes out and the TROUBLE light
comes on. Release the test switch.
STEP 2: Press the hi-limit test switch to the 2
nd
hi-limit position and hold in that position until the
2
nd
hi-limit light comes on. It should illuminate between 430°F and 460°F, and the heating
elements must shut off. Release the test switch. All fryers connected to the external shunt
power supply will be shut off completely and all control panel lights will be extinguished.
For fryers not connected to an external shunt power supply, the 2
nd
hi-limit light will come
on and the fryer will shut off.
STEP 3: Turn power switch to the OFF position.
STEP 3: Allow the cooking oil to cool to below normal frying temperature. When the power switch
is again turned ON, the heaters will turn on and the operating thermostat will resume
control of the temperature. If the red trouble light remains on instead, allow the oil
additional time to cool.
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