Upper and lower compartments calling for
cooling. Upper Thermistor controls compres-
sor. Lower Thermistor controls air babble.
Evap fan, compressor and
condenser fan energized
Air baffle open
By using an electronically controlled air
baffle, it is possible to adjust the set-point
in the lower drawer of a 700BR-2 a maxi-
mum of three degrees colder than the
upper drawer.
Power to the compressor and condenser
fan in a 700BR-2 is controlled by the ther-
mistor located inside the upper reed
switch. When the upper drawer compart-
ment temperature reaches high offset, the
control board energizes the evaporator
fan, compressor and condenser fan. (See
Figure 3-77) When the low offset temper-
ature is achieved in the upper drawer, the
control board de-energizes the evaporator
fan, compressor and condenser fan.
If the lower drawer compartment tempera-
ture (sensed by the thermistor in the lower
reed switch) is at high offset when the
refrigeration system is running, the air baf-
fle will be energized to open. (See Figure
3-77) When the temperature in the lower
drawer reaches low offset, the air baffle is
closed.
Though the compartment air temperatures
will fluctuate, the LCD displays the aver-
age compartment temperatures (See
Figure 3-78).
NOTE: If the temperature in the lower
compartment rises five degrees above its
high offset and the upper compartment is
not calling for cooling, the air baffle will
open and the evaporator fan will be ener-
gized, but the compressor and condenser
fan will remain off
. The air baffle will
remain open until both compartments are
equal in temperature.
NOTE: If the compartment temperature
should ever exceed either the high offset
or low offset (example: when a door is left
open), the temperature displayed on the
LCD will change by one degree per
minute.
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