A/C Pressure

tonyt37

Active Member

Posts

232

• Mar 31, 2009

• #1

Hi

Is there a pressure switch that does not let the system cut in if it is too low? Does anybody know what the static pressure should be? There is gas in and registers 20 PSI on the guage but the compressor will not cut in. I assume it should be higher. Does anybody know what the pressure should be on the low pressure side of the system with the compressor running?

Thanks Tony

 

D

Dann

Active Member

Posts

545

Location

Middle Earth

• Mar 31, 2009

• #2

80psi low side and 180psi high side.

 

tonyt37

Active Member

Posts

232

• Apr 1, 2009

• #3

Thanks Dann. More gas then! Does the compressor not run when the pressure drops below a certain pressure?

 

D

Dann

Active Member

Posts

545

Location

Middle Earth

• Apr 1, 2009

• #4

tonyt37 said:

Thanks Dann. More gas then! Does the compressor not run when the pressure drops below a certain pressure?

Click to expand...

Correct. This to protect the compressor from damage as the special lubricating oil (PAG) is carried around the system by the gas (refrigerant) and the aircon wouldn't work very well anyway at low pressure.