Air Conditioning System Pressure Switch

the switch used depends on the system. For the most part they are all common. It is screwed into a port on the receiver dryer of the A/C system. So depending on the dryer will determine the proper switch. I think 200 or 220 pounds is the correct shut off level.

The pressures for 134a is 30 on the low side and 380 on the high side. The switches are preset so you don't have to worry about it.

If you go to the Vintage air website they have all the info you would ever want to know about AC.

http://www.vintageair.com

I also run 134a with a Sandeen compressor..I put in a 250 psi switch on the high side, It cut the comp out before it got cold I removed the switch and the only thing that cuts my compressor off is the freeze switch in the evap. Make sure you have a moderen high efficincy dual pass cross flow condenser. I have a twin fan setup and I ride in comfort! If you use a high side switch ..make it 400 psi, and let it tell you if the pressure gets that high so you can do something before it blows.

LPB - Nice fan setup. What are they?

Mitsubishi, Just happen to find them and bought the condenser to fit. ackits.com

quote:

Originally posted by BD:
I have a 71 Pantera with an AC system that has been converted to R134a. I have heard of guys installing a pressure switch on the high pressure side to shut of the compressor when the system pressure gets too high or when the pressure is low to protect the system and the compressor. Has anybody out there done this? If so what pressure switch did you use and where did you put it? Thanks.

BD,

This worked real well for me http://www.panteraplace.com/page117.htm

Mike