Normal Operating Characteristics That Are Different From Previous Models; Abnormal Operating Characteristics (Incorrect Operation); Adaptive Defrost; Cooling Operation (Adaptive Defrost) - GE GSS20 Series Technical Service Manual

Normal Operating Characteristics That Are
Different from Previous Models
•
Icemaker auger rotates clockwise.
• Evaporator fan running, without compressor or
condenser fan.
•
Post Dwell (Adaptive Defrost), compressor,
and condenser fan on with evaporator fan off
after defrost cycle.
• Liner Protection Mode, fan comes on when the
doors are open for 3 minutes.
•
Evaporator fan and compressor can run
continuously for 2 hours (Adaptive Defrost).
• Different sound levels can be heard when the
fan changes speed.
• Response time for drastic temperature change
is 2 to 10 minutes. The main control board will
only respond to 8 degrees (Fahrenheit) of
temperature change per minute as determined
by resistance of sensor.
Abnormal Operating Characteristics
(Incorrect Operation)
•
Evaporator fan on, compressor off, and
damper shut (except liner protection mode).
• 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.

Adaptive Defrost

Adaptive Defrost can be described as a defrost
system that adapts to a refrigerator's surrounding
environment and household usage.
Unlike conventional defrost systems that use
electromechanical timers with a fixed defrost cycle
time, Adaptive Defrost utilizes an intelligent,
electronic control to determine when the defrost
cycle is necessary. In order to accomplish the
correct 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.
Adaptive Defrost is divided into 5 separate cycles.
Those operations are:
•
Cooling Operation
• Pre-Chill Operation
•
Defrost Heater Operation
•
Dwell Period
• Post Dwell
(See Pub. #31-9062 for more information on
Adaptive Defrost.)

Cooling Operation (Adaptive Defrost)

During the cooling operation, the main control
board monitors door opening (fresh food and
freezer doors) and compressor run times. The
board counts the time the doors are open. It
reduces the length between defrosts by 255
seconds (multiplication factor) for each second
that each door is open. If both doors are open, it
reduces it by twice the amount. The multiplication
factor reduces compressor run time. If the doors
are not opened, the compressor will run up to 60
hours between defrosts. If the doors are opened
frequently and/or for long periods of time, the
compressor run time between defrosts will be
reduced to as little as 8 hours.

Pre-Chill Operation (Adaptive Defrost)

PRE-CHILL MODE
F
F˚ / C˚
R
E
25˚ / -4˚
E
Z
20˚ / -7˚
E
R
15˚ / -9˚
A
10˚ / -12˚
I
R
5˚ / -15˚
T
E
0˚ / -18˚
M
08:00 09:00
P
-5˚ / -21˚
E
R
-10˚ / -23˚
A
T
U
-15˚ / -26˚
R
E
-20˚ / -29˚
S
When the main control board determines that
defrost is necessary, it will force the refrigerator
– 8 –
14:00 16:00
10:00 11:00 12:00 13:00 15:00
Pre-Chill Defrost
17:00 18:00