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1.13 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 13).
Figure 13
1.13.1 AIF Troubleshooting
Problem Probable Causes Corrective Action
Actuator doesn’t
function.
A. No power to the AIF board.
B. Actuator is unplugged.
C. AIF board failure.
D. Actuator readings are out of tolerance.
E. Actuator is bad
A. 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 harness and ensure 24VDC is
present. Continue to check pins 5 and
6 for 24VDC on plugs J4 and J5 on the
AIF boards.
B. Ensure the actuator is plugged into the
proper connection (J1 for FV return, J3
for DV return and J6 for FV drain and
J7 for DV drain).
C. 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 the actuator is
opening. Pins 2 (Red) and 4 (White)
should measure -24VDC when the
actuator is closing). If either voltage is
missing, the AIF board is likely bad.
Test the actuator by plugging into
another connector. If the actuator
operates, replace the board.
D. Check resistance of the potentiometer
between pin 3 (purple wire) and pin 4
(gray/white wire). Closed should read
0-560Ω. Open should read 3.8K Ω –
6.6K Ω.
E. If proper voltages are present at the
connector and actuator doesn’t
operate, reset power to the fryer. If it
still doesn’t operate 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 (J1 for FV return,
J3 for DV return and J6 for FV drain
and J7 for DV drain).
B. Ensure the locator pin is in proper
position in plug J2. See table B on
page 1-55.