Question 110Refrigeration & AC - 1st Asst/Chief
70% to passThe 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?
A5" Hg
B0 psig
C2.5 psig
D12.5 psig
AI Explanation
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.
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