Hopefully, this is the right place for this post. If not, I apologize. On my property is an old cooling house that was loaded with various coolers and such (there is quite a bit of parts if anyone is interested). I pulled a Copeland CRL3-0350-PFV (4 HP, 208-230V, 47,500 BTU) compressor from one of the industrial air-conditioners hoping to re-purpose it into a vacuum pump. I believe it has a capacitor start motor. Could I start and use this without a capacitor, using just a centrifugal switch? Or would it be necessary to insert the capacitor in series with the phase winding as usual? Also could I adjust the vacuum from the compressor by adjusting voltage (would it still work)?