7
Electronic Functional Description
Temperature Control Operation
For any temperature setting, outputs will be
turned off/on based on cut-in, cut-out
temperatures determined by resistance levels of
freezer and refrigerator thermistors.
Refrigerator and Freezer Thermistor
As temperature decreases, resistance increases.
As temperature increases, resistance decreases.
Open thermistor or thermistor circuit will result
in failure of refrigerator to cool.
Shorted thermistor will cause refrigerator to run
100 percent of time except for defrost cycle.
•
Freezer temperature setting and
thermistor value will determine if
compressor/condenser fan and
evaporator fan switches are open or
closed. Compressor/condenser fan
switch must be open for 6 minutes
before switch can close again
(compressor dwell time.)
•
Refrigerator temperature setting and
thermistor valve will determine if fresh
food fan switch is open or closed.
•
Cut-out and cut-in temperature values
must be reached and maintained for 15
minutes before output state will change
(digital delay).
•
Refrigerator and freezer control
calibration can be adjusted in Program
Mode B.
Factory set freezer and refrigerator
settings.
