Replacing A Rotary Actuator; Oil Level Sensor; Oil Level Sensor Troubleshooting - Frymaster BIGLA30 Series Service Manual

1.16.5 Replacing a Rotary Actuator

Disconnect the fryer from the electrical power supply. Locate the actuator to be replaced and mark and
unplug the actuator. The actuators are held in place by two allen screws. Loosen the allen screws. It may be
necessary to remove a gas line to the burner when removing a drain actuator. Remove the actuator from the
valve stem. Align the actuator with the valve stem and attach the new actuator. Tighten the two allen screws.
Reconnect power and test the actuator.
NOTE: Rotary actuators have two different part numbers, which are mirror images of each other that
correspond to their mounting position.

1.16.6 Oil Level Sensor

The oil level sensor is a device that is used to prevent dry firing
of the frypot (see Figure 25). The sensor looks similar to a high
limit. The sensor is energized when the computer is powered on
with a soft on. The sensor heats up and detects the oil around it.
During filtration when the oil is drained, it senses the difference
between the oil and air. It is controlled with a board located next
to the interface board (see Figure 26) and a separate egg shaped
plastic device (see Figure 27) that contains additional electronics.
Use care when working with the sensor as temperatures may
reach as high as 500°F (260°C).
If oil is surrounding the heater, the oil will
prevent the heater from ever reaching its
setpoint. Once oil is removed during
filtration the heater reaches setpoint and
cycles a thermostat every four seconds.
Since the cycle is only four seconds, the
seven second delay is not made and the
gas valve won't open.
The 120VAC (220-240VAC on Intl.
units) is on T2 in the control box traveling
in on pin 11 of J3 and out pin 7 on J1
(DV) or pin 7 on J3 (FV).

1.16.6.1 Oil Level Sensor Troubleshooting

Typical Sensor Related Failures
- Low temp but no call for heat (heat light)
- Stuck in melt cycle with no call for heat
- Filter error (IS VAT FULL?) with oil in the filter pan (no oil in the vat)
If the computer doesn't exit melt cycle or continues to display low temp and does not heat, and gas supply, gas
valve, etc. have been checked and no heat lamp illuminates because no call for heat is initiated, then follow these
steps:
- Check (see diagram next page)
- Power to oil sensor (from oil level sensor (previous basket lift) relay on interface board K1 (DV) or K4
(FV)). Check pin 7 on J1 (DV) or pin 7 on J3 (FV) for 120VAC (220-240VAC on Intl. units).
- Power to heater/relay coil on relay board. Check voltage to the coil between pins 8 and 1 to ensure that
120VAC (220-240VAC on Intl. units) is present with oil in the vat. If the vat is empty, the power will
Figure 25
Figure 26
1-41
Figure 27