Adaptive Defrost Operation - Whirlpool KSBS20QEWH0 User Manual

ADAPTIVE DEFROST OPERATION

1. This unit is equipped with Adaptive Defrost Control (ADC). (Fig. 12) A defrost cycle occurs after
a predetermined length of compressor run time. The length of accumulated compressor run time
is determined by a microprocessor that monitors the length of a defrost cycle (the time) interval
between energizing the defrost heater and the defrost thermostat opening). The microprocessor
then adapts or changes the amount of accumulated compressor run time between defrost cycles.
2. The accumulated Compressor Run Time between Defrost (CRTD) will be one of the five values
under normal operation:
CRTD (0) = 4 hours (Start Up)
CRTD (1) = 8 hours
CRTD (2) = 12 hours
CRTD (3) = 16 hours
CRTD (4) = 72 hours (Vacation)
• If the defrost cycle length is low, (19 minutes or less), indicating a small frost load, the CRTD
for the next defrost cycle is advanced to the next level.
• If the defrost cycle length is 19 to 24 minutes, indicating a normal frost load, the CRTD for the
next defrost cycle is not changed.
• If the defrost cycle length is 24 minutes or more, the CRTD for the next defrost cycle is lowered
one level.
• When the product is first installed or after a power interruption, the first CRTD will be 4 hours.
3. Vacation Mode: A CRTD of 72 hours will be initiated when the following three conditions exist:
• The defrost interval must have advanced to CRTD (3) = 16 hours.
• Both the refrigerator and freezers doors must have remained closed since the last defrost
cycle.
• The defrost thermostat must have opened in less than 19 minutes during the last defrost cycle.
Fig. 12
11