3-12
Electronic Control System
7011902 - Revision A - October, 2009
International Integrated
International Integrated
(ICB700 Base)
(ICB700 Base)
Series
Series
Regulate Refrigerator Zone Temperature (ICB700BCI)
When the thermistor in refrigerator compartment reaches high off-set temperature, calling for cooling, the refrigerator
compartment fan is energized and microprocessor sends an 18 Volt pulse signal to the air baffle control to open,
regardless of operational state of the compressor. Whenever the fan is energized, the microprocessor repeats send-
ing a pulse signal every 5 minutes to the air baffle control to open. (See Figure 3-20)
If either drawer is opened while the refrigerator compartment fan is operating, the microprocessor will detect power
to the lights and cut power to the fan.
When thermistor in refrigerator compartment reaches low off-set temperature, power to refrigerator compartment fan
is cut and micro-
processor sends an
18 Volt pulse signal
to the air baffle con-
trol to close. When
refrigerator compart-
ment fan is off, micro-
processor repeats
sending a pulse sig-
nal every 5 minutes
to the air baffle con-
trol to close.
Though compartment
air temperatures fluc-
tuates, the LCD dis-
plays average tem-
perature.
NOTE: If compart-
ment temperature
exceeds either high
or low offset (Ex:
drawer is left open),
temperature display
will change by one
degree per minute.
NOTE: If refrigerator
compartment thermis-
tor is faulty, compart-
ment fan defaults to
20 minutes ON, 40
minutes OFF cycling,
EE appears in right of
LCD, SERVICE will
flash and Error Code
05 will be logged.
NOTE: When in
Sabbath Mode, refrig-
erator compartment
thermistor still con-
trols fan operation
except there is a ran-
dom 15 to 25 second
delay before the fan
is energized.
Figure 3-20. ICB700BCI Signal Trace - Regulate Refrigerator Zone
1. Thermistor at high off-set
temp. calling for cooling.
2. No power to ref. light.
3. Ref. fan energized.
4. Pulse signal to air baffle
control every 5 minutes.
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