Haier GE ABE21D, Technical Service Manual, Page: 31 / 41

– 31 –
Dwell
After defrost has completed, the defrost heater
ZLOO EH Rႇ IRU PLQXWHV EHIRUH WKH FRPSUHVVRU
starts. This time allows residual moisture from
GHIURVW WR GURS Rႇ WKH HYDSRUDWRU DQG H[LW WKURXJK
the defrost drain.
Post Dwell
3RVWGZHOO LV WKH ¿QDO F\FOH RI GHIURVW $IWHU GZHOO
is completed, the compressor and condenser
fan will start but the evaporator fan will remain
Rႇ 7KH HYDSRUDWRU IDQ ZLOO VWDUW RQFH WKH SRVW
dwell minimum evaporator temperature of -10°F
is met or the max time of 10 minutes is achieved
ZKLFKHYHU RFFXUV ¿UVW 2QFH WKH HYDSRUDWRU IDQ
starts, the refrigerator returns to normal operation
and restarts the adaptive defrost time.
Defrost Operation
After accumulating the required amount of time
between defrost cycles, the unit will keep running
until the freezer temperature reaches -15°F or 45
minutes of run time has occurred. Once pre-
chill max time has passed, or pre-chill minimum
temperature is achieved, defrost will begin.
2QFH GHIURVW LV LQLWLDWHG DOO IDQV DUH Rႇ WKH
FRPSUHVVRU LV Rႇ DQG WKH KHDWHU LV RQ XQWLO WKH
evaporator thermistor temperature reaches 55°F
or until the heater on-time reaches 40 minutes
ZKLFKHYHU KDSSHQV ¿UVW
Adaptive Defrost
Pre-Chill
Defrost Heater Operation
Adaptive Defrost is a defrost system that adjusts
to a refrigerator’s surrounding environment and
household usage. Unlike conventional defrost
systems that use electromechanical timers with a
¿[HG GHIURVW F\FOH WLPH $GDSWLYH 'HIURVW XWLOL]HV
electronic controls to determine when the defrost
cycle is necessary. In order to accomplish the
optimum defrost cycle time, the main control
board monitors the following refrigerator
operations:
‡ Length of time the refrigerator doors were
open since the last defrost cycle
‡ Length of time the compressor has run since
the last defrost cycle
‡ Amount of time the defrost heaters were on in
the last defrost cycle
If the doors are not opened, the compressor will
run up to 96 hours between defrosts.
Defrost is divided into four separate cycles.
Those operations are:
‡ Pre-Chill
‡ Defrost Heater Operation
‡ Dwell
‡ Post Dwell
Abnormal Defrost
Abnormal defrost is a defrost cycle that has
lasted for 20 or more minutes. Should an
abnormal defrost occur, the next defrost will begin
after 10 hours of compressor run time.