1.3 AIF (Automatic Intermittent) Filtration Service Procedures
The AIF (Automatic Intermittent Filtration)
board controls the actuators that open and
close the drain and return valve. The AIF
boards are located inside a protective housing,
under each frypot (see Figure 11).
Figure 11
1.3.1 AIF Troubleshooting
Problem Probable Causes Corrective Action
Actuator doesn’t
function.
A. Actuator is unplugged.
B. AIF board failure.
C. Actuator is bad.
A. Ensure the actuator is plugged
into the proper connection.
B. Check power on the connector
of the problem actuator while
trying to manually open or close
an actuator. Pins 1 (Black) and
4 (White) should read +24VDC
when trying to open an actuator.
Pins 2 (Red) and 4 (White)
should measure -24VDC when
trying to close an actuator). If
either one of these voltages are
missing, the AIF board may be
bad. Test the actuator by
plugging into another connector
to open or close the actuator. If
the actuator operates, the board
is bad. Replace the board.
C. If proper voltages are present at
the connector and actuator
doesn’t operate, actuator may be
bad. Replace the actuator.
Actuator functions
on wrong vat.
A. Actuator plugged into wrong
connector.
B. Locator pin is in wrong position.
A. Ensure the actuator is plugged
into correct connection.
B. Ensure the locator pin is in
proper position in plug J2. See
table B on page 37-40.
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