Frymaster LOV M3000 - Manual (Page 11)

LOV ™ Generation II Technical Reference
10
Troubleshooting the AIF System (AIF)
Problem Probable Cause Fix
Wrong vat
opens.
Actuator is plugged into wrong
connector.
Locator pin is in wrong position. 1.
2.
Ensure the actuator is plugged into the correct
connection (J1 for FV return, J3 for DV return;
J6 for FV drain, J7 for DV drain).
Ensure the locator pin is in the proper position
in plug J2. (See charts on pages 43-47 of this
manual for proper pin position.) 1.
2.
Actuator doesn’t
function.
No power to AIF board.
Actuator unplugged.
AIF board failure.
Actuator readings are out of
tolerance.
Actuator is bad. 1.
2.
3.
4.
5.
Check pins 5 and 6 of J2 at the MIB board.
Should read 24VDC. Check voltage on pins
5 and 6 at the other end of the harness and
ensure 24VDC is present. Check pins 5 and 6
for 24VDC on plugs J4 and J5 on AIF boards.
Ensure actuator leads are plugged into AIF
board (J1 for FV return, J3 for DV return; J6
for FV drain, J7 for DV drain).
Check the power on the connector of the
problem actuator while manually opening
or closing the actuator. Pins 1 (black) and 4
(white) should produce +24VDC when the
actuator is opening; -24VDC should be read
from Pins 2 (red) and 4 (white) when the
actuator is closing. If either voltage is missing,
the AIF board is likely bad. Test the actuator
by plugging into another connector to open
or close. If the actuator operates, replace the
board.
Check resistance of the potentiometer
between pin 2 (purple wire) and pin 4 (gray/
white wire). Closed should read 0-560Ω. Open
should read 3.8KΩ - 6.6KΩ.
If proper voltages are seen at the connector
and the actuator doesn’t operate, replace the
actuator. 1.
2.
3.
4.
5.
Oil Return Sensor Troubleshooting (Gas LOV
™
Fryers)
The oil return sensor is a device that is used
to prevent dry fi ring of the burners. The
sensor looks similar to a high limit. The
sensors are energized when the computer
is powered on with a soft on. The sensor
heats up and detects the oil around it.
During fi ltration 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 (right) and a
separate egg shaped plastic device (far
right) that contains additional electronics.
Use care when working with the sensor as
temperatures may reach as high as 500°F
(260°C).
The oil return sensor is controlled by a small green board
and the electronics inside the plastic, egg-shaped device
shown above to prevent dry fi ring.