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Cabinet Airflow
There are a total of four fans and three dampers for
controlling airflow inside of the cabinet.
Each FoodSaver™ module has it’s own circulation fan and
damper. The operation of this fan is controlled by the
FoodSaver itself based upon the consumer’s temperature
selection. When there is a call for cooling, the electric
damper is opened and the fan energized. This will pull
cool air from the freezer section to maintain proper
temperature. When the thermistor registers the proper
temperature, the damper will close and the fan will
cycle off. If the consumer’s temperature selection for
the FoodSaver is above the current temperature, a low
wattage heating element will energize to maintain the
desired temperature.
There is a circulating fan incorporated in the top of the
fresh food compartment. This fan operates whenever the
fresh food door is closed. This circulating fan prevents
temperature stratification throughout the fresh food
compartment. This is a DC variable speed fan. The speed
is determined by the Main Control board.
Air is drawn to the fan through a snorkel in the rear of the
cabinet and an air inlet near the top of the cabinet. The air
is discharged through the top of the cabinet and allowed
to cascade down over the contents. This constant airflow
provides temperature control in all areas of the cabinet
within one degree of the setpoint.
When there is a call for cooling in the fresh food section,
the fresh food damper will open and allow cooler air to
be drawn from the freezer compartment. The compressor may not energize at this point if sufficient
cooling can be accomplished with the existing air in the freezer compartment. When the thermistor has
been satisfied, the damper will close. The fresh food stirrer fan will continue to be energized whenever
the fresh food door is closed.
The circulation fan in the freezer compartment is also a DC variable speed fan controlled by the Main
Control board. This fan will energize whenever the freezer door is closed and there is a call for cooling
from the Main Control board.
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NOTE
The circulation fans and dampers can be operated independently of each other with the service
mode. This operation does not rely on the doors being closed or the current cooling demands
on the system. Service Test 07 will check the operation of the fresh food fan and Service Test
19 will report the speed of the fan in revolutions per second (RPS). The evaporator fan can be
checked with Service Test 08 and the speed reported through Service Test 20.
The fresh food damper can be cycled to an open state using Service Test 09 and closed using
Service Test 10.
Since these are DC supplied variable speed motors, they cannot be tested using a jumper or
cheater cord. Applying 120VAC to the inputs of these components will damage them. Verify
proper power to the component and if the motor is not operating, replace the motor.
The fan blades must be properly installed and oriented for optimum airflow. Seat the blade for
placement in the fan shroud openings.
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