What keeps a compressor from "slugging" right after turn on

[Mark]

What keeps a compressor from "slugging" right after turn on

I know from reading that it is bad for a compressor to try to compress liquid refrigerant. I also know that when the compressor cycles off, the refrigerant will migrate away from the warm parts of the system and into the colder parts. So during the off part of the cycle the refrigerant will migrate out of the compressor and out of the condenser and tend to condense and collect as liquid in the evaporator. So what happens when the system cycles back on. Why doesn't the liquid that has collected in the evaporator get sucked into the compressor and damage it when the system cycles back on.

The question seems to apply to both automotive and hermetic compressors.

thanks Mark

[Stormin Mormon]

Crankcase heater, for central AC. For window units, mostly dumb luck.

[new jersey]

Mark you practically answering you own question On off cycle liquid collects into evaporator and on start up of next cycle there is nothing stopping or delaying for that liquid getting into crankcase of compressor so you wind up with busted valves among other things, solving problem of slugging is by adding suction accumulator on suction line, other two items can also help by adding crankcase heater and solenoid on liquid line, for small AC units I would say number one would be of adding suction accumulator if space permit second solenoid and third crankcase heater if you AC is to be used with cold temp. outside then it would be imperative to add crankcase heater and suction accumulator! Tony

So what happens when the system cycles back on. why doesn't the liquid that has collected in the evaporator get sucked

[Zyp]

Close but no cigar. Only a cigarette. LOL