Quote:
Originally Posted by rsgt
Thanks Randy. So if I have a poa valve sitting on the bench I could cap off the discharge hook up my gauge and blow 60 lb on the inlet. Will this let me know if it is free inside?
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Don't cap off the end of the POA valve when testing, If you did that the pressure would rise since the POA valve is a pressure regulator, it regulates the pressure inside the evaporator. It keeps the pressure in the evaporator at whatever it is adjusted to.
You adjust the POA using temperature pressure table for the refrigerant used. You want the pressure to be such that the evaporator temperature is just about 32 degrees.
For R12 temperature of 32 degrees the pressure is 30.1
For R134a temperature of 32 degrees the pressure is 27.8
If the evaporator pressure is less than the above figures the evaporator will freeze up, if the pressure is more (such as in your case) the evaporator will not be cold enough to provide cooling.
The POA valve is isolated from atmospheric pressure so you compensate for altitude on your gauge which is affected by altitude.