GE PSH23SGNAFBS Series, Technical Service Manual

Page: 19 / 45

– 17 –
Adaptive Defrost (Dwell Period)
After defrost heater operation has been terminated
by the main control board, a 5-minute dwell period
occurs. During this period, the compressor,
condenser fan, and evaporator fan remain off. The
remaining frost melting from the evaporator will
continue to drip and drain so that, prior to the
cooling operation, the evaporator will be totally
clear of any moisture. After the 5-minute dwell
period, the unit goes into post dwell.
Adaptive Defrost (Post Dwell)
The post dwell period is designed to cool the
evaporator before circulating air within the
refrigerator. This prevents any residual heat on the
evaporator from being distributed in the freezer.
During this period, the compressor and the
condenser fan are on, but all interior fans are off
and the damper is closed. Post dwell will last 20
minutes or until the evaporator temperature
reaches 0 °F on this model.
Normal Operating Characteristics That Are
Different from Previous Models
• Compressor changes speed.
•
Condenser fan changes speed.
• Fresh food fan changes speed.
• Compressor and fans can run continuously for
more than 8 hours.
Abnormal Operating Characteristics
(Incorrect Operation)
• Rapid fan speed changes. Fan takes at least
1 minute to change speeds.
• Compressor running without the condenser
fan. The compressor and condenser fan
should always run at the same time.
Liner Protection Mode
The liner protection mode will activate if either of
the doors has been open for 3 minutes. This
mode will start the evaporator fan on high speed.
This mode is controlled by 2 timers. Timer #1
monitors door-open time. A 3-minute door-open
count begins when the door is opened. If
3 minutes elapse before the door is closed, the
liner protection mode will become active. Once
the door is closed, timer #1 resets and liner
protection mode goes into standby. In standby,
normal fan and damper operations resume and
timer #2 begins a 3-minute door-closed count.
If 3 minutes elapse without a door opening, liner
protection mode will completely deactivate. If a
door is opened within the timer #2 door-closed
count, the remaining time in the door-closed count
will be deducted from the timer #1 door-open
count.