– 39 –
Fan speed is selected and maintained by the main
control board regulating the length and frequency
of the 13.6 VDC pulse. Temperature can cause
some fan speed variation. Fan speed can vary
+/- 5%, depending on the temperature, with higher
temperatures causing slightly higher speeds.
The evaporator fan has a 4-wire connection:
White Wire (DC Common)
The white wire is the DC common wire used
for testing. During repairs, DC polarity must be
observed. Reversing the DC polarity causes a
shorted motor and/or board.
Red Wire (Supply)
Each motor uses an internal electronic controller to
operate the motor. Supply voltage from the main
control board remains at a constant 13.6 VDC.
Blue Wire (Feedback/RPM)
On previous Arctica models, the blue wire reported
rpm (speed) information to the main control board
for speed control purposes. On this model, the board
does not require or read any feedback information
from the fan motor.
Yellow Wire (Signal)
The yellow wire is the input wire from the main
control board. The main control board provides
6.5 VDC effective voltage for low speed, 8 VDC
effective voltage for medium speed, and 9.5 VDC
effective voltage for high speed. The fan operates
in low speed only when the fresh food thermistor is
satis
fi
ed.
Note:
When testing these motors:
• You cannot test with an ohmmeter.
• DC common is not AC common.
• Verify 2 voltage potentials:
a. Red to white - power for internal controller
b. Yellow to white - power for fan
• Observe circuit polarity.
• Motors can be run for short periods using a
9 volt battery. Connect the white wire to the
negative (-) battery terminal only. Connect the
red and yellow wires to the positive (+) battery
terminal.
Condenser Fan
The fan is mounted in the machine compartment
with the no-clean condenser. The fan and fan
shroud are mounted on one end of the condenser,
and the other end of the condenser is blocked.
When the fan is operating, air is pulled from the
center of the condenser, drawing air in through the
coils. The air is then exhausted over the compressor
and out the right side of the refrigerator.
Inlet air is available through the left front and left
rear of the machine compartment. A rubber divider
strip underneath the refrigerator divides the inlet
and outlet sides of the machine compartment.
Rear
Front
Divider Strip
Housing
Fan
Motor
0.375"
1/2"
Air Flow
0.50" ± 0.05
Bracket
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