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5-7
Touchscreen-Equipped Fryers
Th
e Oil is Back circuit (shown below) is a safety. It
prevents the ignition system in a gas fryer from fi ring
when there is insuffi
cient oil in the frypot.
How it Works
• An additional probe (circled at right) in the gas fry-
pot holds a heater that’s powered by an attached elec-
tronic egg and attached to a seven-second delay board.
• With oil in the vat, the probe’s heater is “cooled”
and kept below its 570°F setpoint.
• With oil out of the pot, the heater rises in tempera-
ture and a four-second relay in the egg begins cycling
to lower the heater’s temperature.
• Th
e cycling of the four-second relay disrupts the seven-sec-
ond relay board.
• Th
e seven-second board opens, denying 24VAC to the gas
valve and DC voltage from the VIB to the OIB relay.Th
e UI
doesn’t call for heat and no errors are displayed.
• When the probe cools with the return of the oil, the egg’s
relay quits cycling, the seven-second relay board closes, DC
voltage from the VIB closes the OIB relay circuit, and the
valve gets power.
What Causes Problems:
• Failure to regularly clean the OIB probe insulates it from
the “cooling” eff ect of the frypot’s oil and will cause the vat to
not heat.
• Open contacts on the seven-second board’s relay.
• Bad ground on OIB circuit.
Oil-is-Back Circuit (gas only) Explained
The OIB probe
must be regularly
cleaned.
The seven-second time-de-
lay board (above) in a
McDonald’s touch fryer and
the egg-shaped electronics
housing on the OIB heater
(right).
The OIB sensor is circled (above).
24VDC
from
VIB
that
passes
through
pins
5
Ͳ
6
5VDC
(approximate)
from
VIB
that
passes
through
pins
9
Ͳ
10
Line
Voltage
7
Ͳ
sec
re
lay
4
Ͳ
sec
relay
in
egg
24VDC
24VAC
DC
Sensing
Voltage
Gas
valve
is
grounded
at
second
module
OIB
relay
Line
Содержание FilterQuick Series
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