– 38 –
Compressor and fan speeds will vary with cabinet
temperatures until the set temperature is obtained.
After 6 hours of compressor run time (door openings
not counted), both the fresh food and freezer will
enter a heated defrost cycle.
Cooling Operation
When cooling is required, the main control board
moves the 3-way valve to either A position
(supplying refrigerant to both fresh food and freezer
evaporators) or B position (supplying only the
freezer evaporator), depending upon compartment
temperatures.
The compressor and fan(s) are delayed for 3 minutes
before restarting.
The compressor will start at HIGH speed for 1
minute, then may change speeds depending upon
the temperature of both the fresh food and freezer
compartments.
When only the fresh food temperature is satisfi ed,
the 3-way valve will move to the B position (supplying
only the freezer evaporator) to continue cooling the
freezer. Fresh food cycle defrost will begin.
When the freezer and fresh food temperatures are
satisfi ed, the compressor and fans will turn off. The
3-way valve will move to the D position, shutting
off refrigerant fl ow to both evaporators to improve
effi ciency and to reduce refrigerant sounds.
After the accumulated compressor run time
(including door openings) has been reached, the
unit will begin the defrost pre-chill cycle. (1 second
of door-open time = 100 seconds of compressor run
time.)
Fresh Food Cycle Defrost
Fresh food cycle defrost occurs between heated
fresh food defrost cycles to reduce excessive frost
accumulations on the fresh food evaporator.
During fresh food cycle defrost, the evaporator
fan runs and there is no refrigerant fl ow thru the
evaporator.
Fresh food cycle defrost does not use the fresh food
defrost heater.
Fresh food cycle defrost will occur any time the
temperature in the fresh food compartment has been
satisfi ed. The fresh food fan will run at LOW speed for
10 minutes, then cycle off if fresh food temperatures
are satisfi ed.
The fresh food cycle defrost does not occur when the
compressor cycles off.
Defrost Pre-Chill (Single and Variable Speed
Compressor)
After accumulating 32 hours of compressor run time
(actual compressor run time and door openings), the
operating system will enter freezer pre-chill.
Pre-chill will occur whether the last freezer defrost
was normal or abnormal.
Pre-chill time will vary from 10 to 60 minutes,
depending on door openings and compartment
temperatures during pre-chill.
Any compressor run time prior to the beginning of
pre-chill does not count in the pre-chill time.
There is a 6-second delay after the compressor
cuts off at the end of pre-chill before energizing the
defrost heaters.
The ice box fan will run at HIGH speed whenever ice
box cooling is needed during the pre-chill cycle.
Pre-chill ends when either the maximum time expires,
evaporator pre-chill temperature is met, or freezer
pre-chill temperatures is met.
Fresh Food Only Heated Defrost
Fresh food only heated defrost occurs after 32 hours
of compressor run time.
A freezer pre-chill will run before the fresh food only
heated defrost.
Providing the previous freezer and/or fresh food
heated defrost cycles were normal, the freezer will
defrost with every third fresh food defrost cycle.
Fresh food only heated defrost occurs 32, 64, and
96 hours after defrosting both fresh food and freezer
together.
(Continued next page)
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