Frymaster H55 Series Technical Reference Manual page 47

OIB, sensor.
The fryers monitor the length
of time required for oil to return
to the frypot after a fi lter cycle
and interpret sluggish return
times as a problem in the fi lter
pan.
These fryers are available in a
McDonald's-exclusive confi gu-
ration and also a general market
version. The fryers share a lot
of similarities, including circuit
boards that monitor
the automated sys-
tems and a Control-
ler Area Network
(CAN) that carries
the communica-
tion in the system.
Although similar,
the boards and their
software are not in-
terchangeable across
the platforms.
Here are features
the chain-specifi c
and general market
platforms share:
• A manual inter-
face board, or MIB,
monitors the oil
fi ltration and top off.
• An automatic top off board, or ATO, works with the MIB to direct oil to a frypot low on oil.
• An automatic intermittent fi lter board, or AIF, operates actuators, opening and closing valves dur-
ing an automatic fi lter cycle.
• A Controller Area Network (CAN) communication system.
• A JIB, or jug in a box, is positioned in the cabinet to provide oil to the top off system. The level of
the JIB is also monitored by the fryer's control system.
Both fryer systems produce savings in oil with the use of the low-volume oil vats and the manage-
ment of optimal oil levels. The systems differ in the operation of the automatic fi lter system.
The McDonald's unit signals the need for fi ltration with a blue LED on the bezel and a prompt from
the M3000 controller. Responding Yes to the prompt with a key on the controller launches the fi lter
cycle.
Automatic Filtering Fryers
The air fl ow through
the 30lb fryers is the
same as in the 50lb
Air flows through the plenum and into
the sealed burners. Heat is applied to
the side of the pot and exhaust gases
flow along the side of the pot, to the
flue and up.
Air from plenum
4-3
The volume differ-
ence is largely in
the cold zone of the
smaller frypot (right)
which is shallower
and narrower.
Ignited gas-air mixture in burner
Heated air flowing across pot,
out flue