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1.13 AIF (Automatic Intermittent) Filtration Service Procedures<br />
The AIF (Automatic Intermittent Filtration) board controls the<br />
actuators that open and close the drain and return valve. The<br />
AIF boards are located inside a protective housing under each<br />
frypot (see Figure 13).<br />
1.13.1 AIF Troubleshooting<br />
1-27<br />
Figure 13<br />
Problem Probable Causes Corrective Action<br />
Actuator doesn’t<br />
function.<br />
Actuator functions on<br />
wrong vat.<br />
A. No power to the AIF board.<br />
B. Actuator is unplugged.<br />
C. AIF board failure.<br />
D. Actuator readings are out of tolerance.<br />
E. Actuator is bad<br />
A. Actuator plugged into wrong connector.<br />
B. Locator pin is in wrong position.<br />
A. Check pins 5 and 6 of J2 at the MIB<br />
board. Should read 24VDC. Check<br />
voltage on pins 5 and 6 at the other<br />
end of harness and ensure 24VDC is<br />
present. Continue to check pins 5 and<br />
6 for 24VDC on plugs J4 and J5 on the<br />
AIF boards.<br />
B. Ensure the actuator is plugged into the<br />
proper connection (J1 for FV return, J3<br />
for DV return and J6 for FV drain and<br />
J7 for DV drain).<br />
C. Check power on the connector of the<br />
problem actuator while trying to<br />
manually open or close an actuator.<br />
Pins 1 (Black) and 4 (White) should<br />
read +24VDC when the actuator is<br />
opening. Pins 2 (Red) and 4 (White)<br />
should measure -24VDC when the<br />
actuator is closing). If either voltage is<br />
missing, the AIF board is likely bad.<br />
Test the actuator by plugging into<br />
another connector. If the actuator<br />
operates, replace the board.<br />
D. Check resistance of the potentiometer<br />
between pin 2 (purple wire) and pin 4<br />
(gray/white wire). Closed should read<br />
0-560Ω. Open should read 3.8K Ω –<br />
6.6K Ω.<br />
E. If proper voltages are present at the<br />
connector and actuator doesn’t<br />
operate, reset power to the fryer. If it<br />
still doesn’t operate replace the<br />
actuator.<br />
A. Ensure the actuator is plugged into<br />
correct connection (J1 for FV return,<br />
J3 for DV return and J6 for FV drain<br />
and J7 for DV drain).<br />
B. Ensure the locator pin is in proper<br />
position in plug J2. See table B on<br />
page 1-55.