GE Profile PSF26PGWBB Technical Service Manual page 33

The condenser fan is mounted with screws to a fan
shroud and mounting bracket that is attached to
the condenser. To access the condenser fan motor,
disconnect power from the refrigerator and remove
the machine compartment cover.
Depending on the model, use one of these two
methods to remove the condenser fan motor from
the refrigerator.
Method #1:
1. Disconnect the condenser fan plug, then remove
the ¼-in. hex-head screw from the upper corner
(closest to you).
2. Pull the shroud assembly slightly to disengage
from the mounting tab.
3. Tilt the shroud assembly towards the
compressor and gently pull the assembly out .
Method #2:
1. Pull the condenser fan blade off the motor shaft.
2. Remove the two ¼-in. hex-head screws that
hold the mounting bracket together.
3. Remove the front mounting bracket and note
the position of the grommet.
4. Disconnect the condenser fan plug, remove the
wire harness from the fan shroud clips, then
remove the fan motor.
On inverter compressor models, condenser fan
speed coincides with compressor speed (low,
medium, high) to minimize pressure variations in the
sealed system except when the freezer temperature
is 20°F above the set point. If this condition exists
(such as during initial startup), the condenser fan
operates at super high speed while the compressor
operates at medium speed.
Note: Single-speed compressor models use a single-
speed condenser fan.
The speed of the fan is controlled by the voltage
output from the main control board (J2 pin 8 to J2
pin 3). Voltage output from the control board to the
fan is 13.6 VDC; however, to regulate the speed of
the fan, the main control board uses pulse width
modulation.
When operating, voltage is sent in pulses (much like
a duty cycle) as opposed to an uninterrupted fl ow.
This pulsing of 13.6 VDC produces effective voltage
being received at the motor, which is equivalent to a
reduction in voltage.
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.
Fan Blade
Condenser fan speed is controlled by pulse width
Motor
modulation, the same method used to control fan
speeds for the evaporators.
13.6 VDC
12.0 VDC
0 VDC
13.6 VDC
10.5 VDC
0 VDC
13.6 VDC
7.5 VDC
0 VDC
13.6 VDC
5.5 VDC
0 VDC
– 33 –
Super High Speed (12.0 VDC measured)
High Speed (10.5 VDC measured)
Medium Speed (7.5 VDC measured)
Low Speed (5.5 VDC measured)