LG LFX31995ST Training Manual page 159

Three Way Valve
LFX31995ST Refrigerator
Three Way Valve
The Three Way Valve is used to supply Freon to both refrigerator and
freezer evaporators.
The valve can send Freon to one at a time or both at the same time or to
neither evaporator.
The Main Power Control Board from Con 6 sends 12Vdc @ a varying Hz
to the Stepping Motor to open ports to the proper evaporator based on
Sensor readings at the Refrigerator & Freezer Sensors.
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When the refrigerator is 1 plugged in Freon is sent to both evaporators
until one of the sensors is satisfied and then will send Freon to the
remaining evaporator until that sensor is satisfied.
When both the refrigerator and freezer sensors are satisfied the Three
Way Valve closes ports to both evaporators while the compressor
continues to operate for a few seconds to pump the sealed system
down.
In the Test Mode ports are open to both evaporators in Steps 1 & 2 .
Both ports are closed in Step 3 (Forced Defrost).
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