Regulate Freezer Zone Temperature (UC-24C Only)
When the freezer compartment thermistor detects high off-set temperature, calling for cooling, the compressor and
condenser fan motor are energized, as well as the evaporator fan motor. (See Figure 3-18)
If the door is opened while the evaporator fan is operating, the microprocessor will detect the power signal to the
lights and cut power to the fan.
NOTES:
• When the freezer compartment calls for cooling after a defrost, the evaporator fan will not be allowed to run until
the thermistor on the evaporator drops to 35°F (2°C).
• If compartment tem-
perature exceeds
either high or low
offset the tempera-
ture display will
change by one
degree (1°) per
minute.
• If freezer compart-
ment thermistor is
faulty, compressor
operation defaults to
twenty (20) minutes
ON, twenty (20) min-
utes OFF cycling;
EE appears in left of
LCD; SERVICE
flashes and Error
Code 07 is logged.
• If evaporator ther-
mistor is faulty, the
compressor will be
energized after the
dwell time and the
evaporator fan will
be energized 3 min-
utes later; SERVICE
flashes and Error
Code 08 is logged.
• When in Sabbath
Mode, the freezer
compartment ther-
mistor still controls
compressor opera-
tion, except there is
a random fifteen
(15) to twenty-five
(25) second delay
before the compres-
sor is energized.
Electronic Control System
Under Counter (UC-24) Series
3-12
#7003933 - Revision B - November, 2007
Figure 3-18. UC-24C Signal Trace - Regulate Freezer Zone Temperature
1. Freezer compartment thermistor at high off-set temp. calling for cooling.
4. Evap fan
energized.
2. Compressor and con-
denser fan energized.
3. Door is closed, so no power to lights.
This is monitored via the orange wire.
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