3-15
Electronic Control System
7011902 - Revision A - October, 2009
International Integrated
International Integrated
(ICB700 Base)
(ICB700 Base)
Series
Series
Monitor and Control Refrigerator Fan-Assisted, Off-Cycle Defrost (ICB700BR)
Temperature signals from refrigerator evaporator's thermistor’s are observed by the microprocessor. During off cycle
defrost, if a refrigerator zone temperature reaches high offset (calling for cooling) before evaporator temperature
rises to 3°C (38°F), no power will be supplied the the compressor. But, the the zone evaporator fan will switch ON.
Once the evaporator temperature reaches 3°C (38°F), normal cooling functions begin. (See Figure 3-23).
NOTE: If refrigerator compartment thermistor is faulty, compressor operation defaults to 20 minutes ON, 40 minutes
OFF cycling, EE appears in left of LCD, SERVICE will flash and Error Code 05 will be logged.
NOTE: If evaporator thermistor is faulty, the compressor will not energize until zone air temperature exceeds high
offset by 3°C (5°F). SERVICE flashes and Error Code 06 is logged.
NOTE: When in
Sabbath Mode, the
refrigerator compart-
ment thermistor still
controls compressor
operation, except
there is a random 15
to 25 second delay
before the compres-
sor is energized.
Figure 3-23. ICB700BR Signal Trace - Refrigerator Fan Assisted Off-Cycle Defrost
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