Question 110Refrigeration & AC - 1st Asst/Chief

The correct answer is A) 5" Hg. The low-pressure cutout switch is designed to protect the compressor from damage due to low suction pressure. The cutout pressure is typically set higher than the cut-in pressure by a specific differential. In this case, the cut-in pressure is 5 psig, and the differential is 7.5 psig. Therefore, the cutout pressure would be 5 psig + 7.5 psig = 12.5 psig. The conversion from psig to inches of mercury (Hg) is: 12.5 psig = 5" Hg. The other options are incorrect because B) 0 psig is too low, C) 2.5 psig is too low, and D) 12.5 psig is the correct value in psig, not the answer in inches of mercury.