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If you have the R4 compressor... the super hockey puck...
then keep in mind that it does not have an oil reservoir like the sandens or Yorks...
so ALL your lubrication is by the oil which is mixed into and carried around the system by the Refrigerant...
If your system is low or out of refrigerant you should really really limit its running in that state...
Your safer bet is to add your refrigerant until it will turn on by the switch... by having the can in warm water... and since you have vacuumed your system it should fill nicely...
You have not said if you flushed your system...
or why you are needing to put refrigerant into it....
thus we or you.... may not know how much oil is in the loop....
very important thing to know..
you might share info with us as to the situation..... we might save you a lot of trouble and money.....
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