What typically happens to suction pressure after a reciprocating compressor is shut down on a low-pressure cut-out?

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Prepare for the New York City Refrigeration License Exam I. Utilize flashcards, multiple-choice questions, and detailed explanations to boost your readiness. Ace your licensing exam!

Multiple Choice

What typically happens to suction pressure after a reciprocating compressor is shut down on a low-pressure cut-out?

Explanation:
When the compressor is shut down on a low-suction-pressure control, the suction side is no longer being drawn down by the compressor. The evaporator continues to absorb heat, turning more refrigerant into vapor and raising the vapor pressure on the low side. With no pump pulling vapor out, the suction pressure climbs quickly toward the evaporator’s saturated vapor pressure. In short, heat input keeps vaporizing refrigerant, and the off compressor cannot remove it, so suction pressure rises rapidly.

When the compressor is shut down on a low-suction-pressure control, the suction side is no longer being drawn down by the compressor. The evaporator continues to absorb heat, turning more refrigerant into vapor and raising the vapor pressure on the low side. With no pump pulling vapor out, the suction pressure climbs quickly toward the evaporator’s saturated vapor pressure. In short, heat input keeps vaporizing refrigerant, and the off compressor cannot remove it, so suction pressure rises rapidly.

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