Fans - GE Profile PSB42LSRBV Technical Service Manual

Fans

All 3 fans (condenser, freezer, and fresh food) are
variable-speed DC fans. The speed of each fan
is controlled by an algorithm in the power control
board (PCB) and determined by many factors,
such as room ambient, thermal load, temperature
settings, number of door openings, etc. The fans
are extremely QUIET, and determining fan speed
is very diffi cult. As a general rule, if the voltage
measured at the fan is within limits and airfl ow
is felt through the vents, assume the fans are
working correctly.
Note: The fans will run on a 9-volt battery for
testing purposes. Use the two higher voltage pins
as described in the following procedures.
Freezer Evaporator Fan
The freezer fan assembly is mounted directly to
the freezer evaporator. The fan assembly (motor,
blower and housing) is available as a separate
part or complete and preassembled on a new
freezer evaporator.
Operation of the freezer fan is also affected by
room temperature. If the ambient thermistor
senses a temperature of 82°F (28°C) or higher,
the freezer fan will delay 5 minutes (after the
compressor has started) before starting and
circulating the freezer air. Below 82°F (28°C), the
fan will start immediately with the compressor.
The freezer evaporator fan motor supply voltage
can be checked at CN06 on the terminal block.
When the power control board (PCB) is
energizing the fan, check for approximately 8 to11
VDC at CN06, between pin #2 and pin #3, and
approximately 2.25 VDC, between pin #1 and pin
#3 .
CN06
LIGHT BLUE
BLACK
1
ORANGE
GRAY
YELLOW
2
GRAY
3
Fresh Food Evaporator Fan
The fresh food fan assembly is mounted directly
to the fresh food evaporator. The fan assembly
(motor, blower, and housing) is available as a
separate part or complete and preassembled on
a new fresh food evaporator.
WHITE
BLDC F-FAN
RED
BLACK
– 41 –
The fresh food evaporator fan motor supply
voltage can be checked at CN05 on the terminal
block. When the power control board (PCB)
is energizing the fan, check for approximately
7 to 8 VDC between pin #2 and pin #6, and
approximately 2 VDC between pin #2 and pin #5
at CN05.
CN05
GRAY
2
BROWN
5 LIGHT BLUE
3
ORANGE
ORANGE
4
6
GRAY
5
Condenser Fan Assembly
Ambient temperature affects the operation of the
condenser fan. If the room temperature is less
than 45°F (7°C), the condenser fan will not run
when the compressor is on. If the temperature
is between 45°F (7°C) and 50°F (10°C), the fan
will start 5 minutes after the compressor has
started. Above 50°F (10°C) (or if the ambient
thermistor is open or shorted), the condenser fan
is synchronized with the compressor.
Condenser Fan Assembly
The condenser fan assembly is held in place
by 2 Phillips-head screws at the front and 2
tabs at the rear. The 2 tabs are inserted into
the rear condenser mounting plate. The 2 front
screws attach the shroud assembly to the front
condenser plate. (See photo below.)
Shown with Condenser Fan Assembly Removed
Tab Location
Tab Location
WHITE
2
BLDC R-FAN
RED
4
BLACK
1
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