the pressures will vary a bit-depending on outside temp and humidity. Generally on the low side 25-35 psi. On the high side; double the outside temperature and add aprox 15lbs--so if its 80 degrees-- about 175-180. High side pressure can vary a lot between 135-250 psi. The amount of charge in the system and the load also will cause it to vary.--Good Luck--T&T
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