compressor is one of the essential component of an Air-Conditioning Loop, its basic functioning is to increase the pressure and temperature of the refrigerant which is then passed through the condenser where heat exchange takes place thus reducing the temperature, keeping the pressure intact.
then comes the expansion valve which reduces both the temperature and pressure, thus we achieve a refrigerant at lower temperature and pressure, which is used to cool down the room, the exit from the evaporator is then connected back to compressor inlet via accumulator
The purpose is what it was without a HVAC system ... to make heat !
what is purpose of a compressor
Compressor outlet to metering device inlet.
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Do a compressor oil acid test.
evacuation removes and non condensables from your hvac system such as air or moisture
With an ohm-meter. Check for continuity in the RUN and START windings, and also from the terminals to compressor case for shorting. There should be continuity in the windings and no continuity from windings to compressor case.
Air compressor for what purpose?
There could be several reasons that could be the cause of your problem. But more than likely the compressor is not working or you have lost all of your coolant. If it's a window AC then get a new one, if it's a Central HVAC then find a good HVAC Tech to check your compressor and Coolant Levels.
to have a good life
to prevent liquid refrigerant from staying in the compressor after shut down
It compresses the air in a engine or compressor.