Automatic Filtering Fryers
4-6
Auto Top Off System
ATO Sensor
AIF Sensor
High limit
Oil Return/Top
Off Slots
Oil Defl ector
ATO Sensor
AIF Sensor
High limit
Oil Is Back
Sensor
Temperature
RTD
The core of the system is the automatic top-off board.
It senses when the oil is low and fi lls the pot to the top
line.
The oil level is monitored by an RTD (Resistance
Temperature Detector) sensor in the frypot at the upper
oil level. The oil is pumped to the pot from a reservoir,
called a JIB (Jug In Box).
A circuit board, the ATO (Automatic Top Off), is
located inside a box behind the JIB. It monitors the
oil-level RTD and activates the pump when it senses an
oil temperature drop of 60°F below setpoint, indicating
the oil has moved away from the sensor. The ATO sends
a signal to the MIB (Manual Interface Board), which
then sends a signal to the AIF to open the actuator on the
return valve of the frypot to be topped off.
Once the actuator has opened the return valve, oil is
pumped into the vat until the ATO RTD detects a tem-
perature within 55°F of setpoint or 60 seconds elapses.
When the RTD is satisfi ed, the actuator closes the valve.
Top off will continue on the next vat if needed.
The system is not active until the oil reaches setpoint.
That temperature is monitored by the temperature probe.
The activation of the system is handled by the fryer’s
controller. The automatic top off system is also inactive
during cooking, fi lter and dispose cycles.
When the JIB is empty, the 60-second pumping is fol-
lowed by a short halt and then another pumping session.
There is one longer pumping session and, assuming the
RTD still doesn’t sense oil, the empty JIB LED is illumi-
nated or an EMPTY JIB display scrolls on the controller.
McD Electric Vat
McD Gas Vat
ATO Sensor
AIF Sensor
OIB Sensor
The probes that
make the top off
and automatic fi lter-
ing work are shown
inside and outide
the frypot (above).
The oil’s movement
can be hindered by
clogs in the drain
elbow (left) in stores
that allow crumbs
to gather in the
frypot.
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