Frymaster H55 Series Technical Reference Manual page 54

Auto Filtration (MIB and AIF)
The auto fi ltration system is controlled by the fryer's
controller, the AIF (Automatic Intermittent Filtration)
board and the MIB (Manual Interface Board). The
fi ltration is largely hands-off. A button push starts the
operation.
Actuators — linear on the early McDonald's fryers
and rotary on FilterQuicks and later McDonald's units
— operate the valves.
The controller is programmable and it allows
fi lter cycles to be launched after a set number of
cook cycles and a prescribed elapsed time.
The system can be set to lock out automatic
fi ltration during busy times, such as the lunch
rush.
The operator can decline a fi lter; cooking
can continue. When an
automatic fi lter cycle is
launched, the MIB and the
AIF boards communicate.
The MIB controls and
oversees the fi ltration; the
AIF board operates the
actuators, which open
and close the valves.
The MIB is in the fryer
cabinet. It is partially
covered by a sheet
metal cover and the
LED display is visible.
Buttons behind the cover
allow limited manual
operation
The LED displays
codes that can be used to
diagnose failures.
Automatic Filtering Fryers
The control-
lers (FilterQuick
above left and
M3000 above
right) scroll a
request to fi lter
when the fryer
vat reaches a
pre-programmed
number of cook cycles. The McDonald's
fryer (above) fl ashes a large blue LED on
the bezel. The FilterQuick illuminates (right
above) a button below the controller.
Valve actuators were initially linear
(above right) on the LOV fryers.
Rotary actuators (right) became the
standard on the electric model in
January of 2012 and on the gas in
May of that year. Linear and rotary
are not interchangeable.
4-10
An AIF board is mounted under each fry vat.
Video Content
Click to Play FilterQuick (left) McDonald's (right)