The low-pressure cutout switch settings vary with the refrigerant used and the temperature application. If the low-pressure cutout switch for a particular application is set with a cut-in pressure of 5 psig, what would be the cutout pressure if the differential is 7.5 psig?

Question

Accepted Answer

Option A: 5" Hg. With a cut-in pressure of 5 psig and a differential of 7.5 psig, subtracting the differential from the cut-in (5 minus 7.5) results in a cutout of -2.5 psig, which equates to approximately 5 inches of mercury (5" Hg) vacuum.