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 cut-out pressure if the differential is 7.5 psig?

Question

Accepted Answer

Option A: 5" Hg. Subtracting the differential pressure (7.5 psi) from the cut-in pressure (5 psig) yields -2.5 psig, which corresponds to approximately 5 inches of mercury (Hg) vacuum on standard compound refrigeration pressure gauges.