Way Valve - GEAppliances CFE28TSH Technical Service Manual

The 3-way valve is located in the machine
compartment between the compressor and the
condenser fan.
The capillary tubes on the refrigerator are color
coded on the tubing.
The fresh food capillary tube is on the left, and color
coded with .
The freezer capillary tube is on the right, and is color
coded with .
Fresh Food
Capillary Tube
The
They are referred to by the letters A, , C, and .
Open to the fresh food and freezer
A
through the fresh food evaporator and then
into the freezer evaporator.)
Open to the freezer evaporator only
Open to both the fresh food and freezer
evaporators via the individual capillary tubes
C
(This position is not currently used on these
models for cooling.)
Closed to both fresh food and freezer
called the home position.)
The inverter controls compressor speed by
frequency variation and by Pulse Width Modulation
(PWM). Changing frequency and PWM will cause an
be received at the compressor. Frequency will vary
from 40Hz at low speed, up to 151Hz at high speed.
The inverter receives commands from the main
control board. The main control board will send a
PWM run signal from the J9 connector pins 7 to
wires must be connected). The inverter will select
the compressor speed (voltage output) based on
this signal. The PWM run signal voltage can also be
checked at the inverter harness. The main control
board will only send a run signal to the inverter
Freezer
when the compressor should be on.
Capillary
Tube
When measuring signal voltage (from the
main control board) at the inverter, a reading of 4-6
VDC will be measured with all wires connected. If the
inverter wiring is disconnected, the board output will
measure between 4-5 VDC.
The inverter will monitor compressor operation and
if the compressor fails to start or excessive current
draw (4 amps maximum) is detected, the inverter
then make twelve consecutive compressor-start
attempts (once every 12 seconds). After twelve
attempts, if the compressor has not started, an
8-minute count will initiate. After the 8-minute
count, the inverter will attempt to start the
compressor again. If the compressor starts, normal
operation will resume. If the compressor fails to
start, this process will be repeated. Removing power
to the unit will reset the inverter count. When power
is restored, the inverter will attempt to start the
compressor within 8 minutes.
The inverter has built-in circuit protection to
guard against damage from a failed or shorted
compressor. However, if a failed compressor is
diagnosed, order a new compressor and inverter.
to start after inverter replacement, replace the
compressor.
– 79 –
compressor fails
(Continued next page)