Question 87Refrigeration & AC - QMED

The correct answer is C) start and stop the compressor as needed. The low-pressure cut-out switch is a safety device used in refrigeration systems to prevent damage to the compressor. It is designed to automatically shut off the compressor when the suction pressure drops below a pre-set, safe level. This prevents the compressor from operating under a vacuum, which could lead to mechanical damage. The low-pressure cut-out switch is considered a primary controller as it directly controls the operation of the compressor based on the system's low-side pressure. The other options are incorrect as they do not accurately describe the primary function of this safety device.