Electronic Control System
Under Counter (UC-24) Series
3-13
#7003933 - Revision B - November, 2007
Regulate Refrigerator Zone Temperature (UC-24C Only)
When the thermistor in refrigerator compartment reaches high off-set temperature, calling for cooling, the micro-
processor sends an 18 Volt pulse signal to the air baffle control to open, regardless of operational state of the com-
pressor. When calling for cooling, the microprocessor repeats sending a pulse signal every five (5) minutes to the
air baffle control to open. (See Figure 3-19)
When the refrigerator compartment thermistor detects low off-set temperature, the microprocessor sends an 18 Volt
pulse signal to the air baffle control to close. Whenever the refrigerator compartment is not calling for cooling, the
microprocessor repeats sending a pulse signal every five (5) minutes to the air baffle control to close.
NOTES:
• If compartment tem-
perature exceeds
either high or low
offset the tempera-
ture display will
change by one
degree (1°) per
minute.
• If refrigerator com-
partment thermistor
is faulty, air baffle
defaults to twenty
(20) minutes open,
forty (40) minutes
closed cycling; EE
appears in right of
LCD; SERVICE
flashes and Error
Code 05 is logged.
• When in Sabbath
Mode, refrigerator
compartment ther-
mistor still controls
baffle operation
except there is a
random fifteen (15)
to twenty-five (25)
second delay before
the baffle is ener-
gized.
Figure 3-19. UC-24C Signal Trace - Regulate Refrigerator Zone
1. Refrigerator compartment
thermistor at high off-set
temp. calling for cooling.
2. Pulse signal to air baffle
control every 5 minutes.
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