11
Evaporator Fan (cont.)
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 satisfied.
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 (13.7 VDC)
b. Yellow to white - power for fan (5.5 to 12 VDC)
• 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.
mabe CONFIDENTIAL AND PROPRIETARY INFORMATION-NOT FOR PUBLIC DISCLOSURE. January 2008
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