Liquid Line Solenoid - Pump Down

WyrTwister · Jul 28, 2013

Liquid Line Solenoid - Pump Down

Through out the years , I have come into contact with commercial split systems with a Liquid Line Solenoid .

The controls activated the solenoid , when the thermostat ( or Building Automation System ) was satisfied .

The compressor started to pump down and , best I remember , the compressor shut down on low suction pressure ?

That is the reason this method is used , rather than simply have the ASA turn off the compressor contactor ?

Thanks ,
Wyr
God bless

ryan1088 · Jul 28, 2013

To make sure the compressor starts unloaded.

WyrTwister · Jul 28, 2013

So , when the BAS initiates a start , the solenoid is opened and refrigerant inside the compressor starts to flow ?

It flows through the evaporator coil until the refrigerant returns to the suction side of the compressor ( hopefully as a superheated gas) ?

The low pressure device / switch activates when the pressure rises to its set point ?

At this step , the compressor starts ? And it starts in an unloaded state / condition ?

Thanks ,
Wyr
God bless

Liquid Line Solenoid - Pump Down

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