Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration technician is checking a low-pressure switch (LPS) on a medium-temperature system. The cut-in setting is 200 kPa (29 psig), and the differential is 100 kPa (14.5 psi). At what pressure will the compressor stop if the system experiences a refrigerant leak?
The cut-out pressure of a low-pressure switch is calculated by subtracting the differential from the cut-in pressure. Therefore, 200 kPa (cut-in) - 100 kPa (dif
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Question: A refrigeration technician is checking a low-pressure switch (LPS) on a medium-temperature system. The cut-in setting is 200 kPa (29 psig), and the differential is 100 kPa (14.5 psi). At what pressure will the compressor stop if the system experiences a refrigerant leak?
Answer options: ✅ 100 kPa (14.5 psig).
- 200 kPa (29 psig).
- 300 kPa (43.5 psig).
- 50 kPa (7.25 psig).
Correct answer: 100 kPa (14.5 psig).
Explanation: The cut-out pressure of a low-pressure switch is calculated by subtracting the differential from the cut-in pressure. Therefore, 200 kPa (cut-in) - 100 kPa (differential) = 100 kPa (cut-out) where the compressor will stop.
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