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 ?