What should your pressure read for ac condenser?
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what kind of freon ?
rule of thumb for head pressure = head pressure converted to temperature should be about 30 degrees above ambient temperature.
My pressure usually reads 110/70 unless my children are around, then it shoots up to 140/90.
If you are asking what the pressures of the AC unit are, it really depends on too many variables that you have not defined. The type of unit, manufacturer, the refrigerant in the system, the dry still ambient air temperature at the condenser, the wet bulb temperature of the living space, and if you are reading hi or low pressure.
Superheat and Subcooling will be indicated on the service panel of the unit being diagnosed.
Greg has it somewhat right. I'll try to break it down a little more. IF were talkin R-22, Make sure you know the outside temp and hook up the guages. (Both low and High side). The head pressure, (red guage) should be around 30 above the r-22 reading on that guage. 30 is a guideline for a clean condenser and a well working unit. The low side, blue guage, should read 65 and up to 80 depending on how hot it is inside the house. Other things will change those numbers and those are simple guidelines to go by.
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