Part number 20219, Rev 0
7
ELECTRONIC TEMPERATURE CONTROL
Description and Functions
The Electronic Temperature Control is a digital microprocessor based temperature control,
indication, and alarm system. It continuously monitors the temperature of the
refrigerator/freezer through its sensor assembly. When the temperature warms to the point
where it reaches the upper temperature limit, the controller sends a signal to turn on the
compressor, which cools the unit. The snowflake icon will illuminate on the display. The
compressor is kept running until the temperature reaches the cold setting. When this lower
temperature set point is reached the controller turns off the compressor and the snowflake
icon extinguishes. The refrigerator/freezer warms over time and the process continues.
The Electronic Temperature Control also provides the following functions:
Red LED for visual indication of an alarm condition
Beeper for audible indication of an alarm condition
A preprogrammed 5 minute delay from the time a set point is attained until an alarm
condition is declared. This prevents spurious alarms for things like door openings.
Operating Mode
The
Electronic Temperature Control normally displays the current interior temperature in
degrees Celsius. To display the compressor off set point, press the SET button and release. The
display will momentarily display the set point and then revert to the current temperature.
The control also records the warmest and the coldest temperatures seen by the controller since
the memory was last reset. To access these temperatures, press the
up arrow
for the warmest
temperature or press the
down arrow
for the coldest temperature. To clear out the memory,
press the corresponding arrow button. Immediately press and hold the SET button until the
“rSt” message is displayed. The corresponding temperature memory is now erased.
