ELECTRIC FRYERS - SERVICE PROCEDURES AND ADJUSTMENTS
10
SERVICE PROCEDURES AND ADJUSTMENTS
WARNING:
HOT OIL AND PARTS CAN CAUSE
BURNS. USE CARE WHEN SERVICING THE
FRYER.
WARNING:
CERTAIN PROCEDURES IN THIS
SECTION REQUIRE ELECTRICAL TESTS OR
MEASUREMENTS WHILE POWER IS APPLIED
TO THE MACHINE. EXERCISE EXTREME
CAUTION AT ALL TIMES. IF TEST POINTS ARE
NOT EASILY ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST EQUIPMENT AND
REAPPLY POWER TO TEST.
THERMISTOR PROBE
RESISTANCE CHART
Solid State Control
F Resistance
± 10%
77 30,000 ohms
311 494 ohms
340 340 ohms
NOTE:
If probe is opened or disconnected, the LED
near the center of the Control Board will be on. If
probe is shorted, the first high limit light will be on.
Computer Control
F Resistance
± 10%
F Resistance
± 10%
77 100,000 ohms 300 1394 ohms
212 5573 ohms 350 717.7 ohms
275 2004 ohms 392 434.5 ohms
TEMPERATURE CONTROL
CALIBRATION
Solid State Control
1. Shortening in tank must be to fill line.
2. Allow the oil to cool below 300 F.
3. Place a thermometer in the center of the tank
one inch below the oil surface.
4. Set the temperature control to 350 F and turn
the fryer on.
5. After the thermometer reads 350 F, allow the
temperature control to cycle three times.
6. Agitate the shortening, to eliminate any cold
zones, while you record the temperatures to
calculate average temperature.
7. Calculate the average temperature. Average
temperature = (Temperature at "off” +
temperature at "on") / 2 . (Example: (360 +
340 ) / 2 = 350 F. The average temperature
should be 350 F (± 5 F). The following steps
should be taken if not.
A. Carefully loosen the set screw in the
temperature control knob.
B. Rotate the knob and set the knob at the
shortening temperature.
C. Tighten the set screw.
D. Allow the fryer to cycle and check for
agreement with the thermometer.
8. If the above adjustments can not be obtained,
check the control and temperature probe as
outlined under "TEMPERATURE CONTROL
TEST” and “THERMISTOR PROBE
RESISTANCE CHART".
TEMPERATURE CONTROL
TEST
WARNING:
DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. THERE MAY BE TWO SEPARATE
CIRCUITS. BE SURE BOTH ARE
DISCONNECTED. PLACE A TAG ON THE
CIRCUIT BOX INDICATING THE CIRCUIT IS
BEING SERVICED.
1. Remove screws securing control panel and let
panel swing down.
2. Disconnect potentiometer plug.
3. Connect ohm meter to pins 1 and 3. Meter
should read 10k ohms ± 10%.
4. Connect meter to pins 1 and 2. With knob
turned clockwise to the stop, the meter should
read zero ohms. Slowly rotate knob
counterclockwise to stop and meter should
change reading from 0 up to 10k ohms. Check
that there are no dead spots and that wiper
tracks smoothly as you rotate knob.
5. Connect meter to pins 3 and 2. With knob
turned counterclockwise to the stop, the meter
should read zero ohms. Slowly rotate knob
clockwise to the stop and meter should change
reading from 0 up to 10k ohms. Check that
there are no dead spots and that wiper tracks
smoothly as you rotate knob.
