Electronic Control System
Under Counter (UC-24) Series
3-18
#7003933 - Revision B - November, 2007
Monitor Compressor Run Duration, Displays If Service is Needed
The microprocessor observes the state of the compressor relay to determine the length of compressor run time (See
Figure 3-24). If the compressor runs 100% (Freezer = 6 hours, Refrigerator = 4 hours), an error code is logged (EC
40, or EC 50, respectively), and defrost will be initiated, but SERVICE will not
flash.
If several 100% compressor run periods occur, and the door was not opened during the last excessive compressor
run period, and the temperature in the zone is not able to fall half way between the set point and the low off-set,
then SERVICE will flash (See Figure 3-25).
NOTES:
• After the problem is corrected, the error code must be cleared from memory, otherwise a non-flashing “SERVICE”
will display constant on the LCD. See “Clearing Non-Flashing “SERVICE” and Error Codes” later in this section.
• If the unit is ever switched OFF then back ON, the compressor will not energize for at least three (3) minutes.
This three (3) minute minimum OFF time is used to protect the compressor and its electricals.
Figure 3-25. Service Flashing if several 100% compressor run periods occurred, the door was not opened
during last excessive run period, and temperature is not able to fall half way between set point & low off-set.
To Next Page
Loading...
