Specifications

1-26
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 11).
Figure 11
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 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. If proper voltages are present at the
connector and actuator 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 1-51.