a/c pressure switch

Anyone have a source for a binary a/c pressure switch connect via schrader valve.
i want to replace the single high pressure turn on fan to a dual function that shuts power to the clutch on the compressor low pressure and turns on the fan high pressure
LLoyd
 
Lloyd,
You really need a trinary switch, which switches the compressor off if the system pressure is low and the fans on if it goes too high.
The wiring is only very slightly more complex than for the binary, but it will save your compressor if the coolant leaks away.
I have a diagram. If you're interested, PM me.
Tony
 
The problem is I just paid 200.00 to charge the system. There currently is a Schader connection to be able to remove the exiting high pressure switch from a pressurized system. So I'm confused do I need a binary or trinary switch to shut off compressor for low pressure and turn a fan on for high pressure. I was able to find a lot of these switches but they all have pipe thread. Do they make an adapter that has a female schrader and a female pipe thead.
 
red dot makes what i was looking for trinary switch rd-5-4583-op
connects to an r12 schrader port
LLoyd
 
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