ELECTRIC FRYERS - SERVICE PROCEDURES AND ADJUSTMENTS
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 | F | Resistance |
| ± 10% |
| ± 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 300F.
3.Place a thermometer in the center of the tank one inch below the oil surface.
4.Set the temperature control to 350F and turn the fryer on.
5.After the thermometer reads 350F, 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 = 350F. The average temperature should be 350F (± 5F). 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.
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