Question 87Refrigeration/AC - QMED70% to pass
What is the purpose of the low-pressure cut-out switch as used as a primary controller for a refrigeration system or unit?
AI Explanation
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.
Related Questions
#85 Which of the following statements is true concerning the attached illustration? Illustration GS-RA-12 #86 Which of the listed operations will cause an automatically controlled refrigeration compressor to restart if the system features a pump down cycle? #88 In a refrigeration system featuring low-side pump down prior to the automatic shutdown of the compressor, the temperature of the refrigerated space is controlled by the action of a thermostat wired to what device? #89 How does a refrigeration solenoid valve differ from a modulating valve? #90 A container unit's microprocessor-controlled temperature controller is set at -28.9°C, appropriate for a frozen cargo of ice cream. In this mode of operation, according to the illustrated temperature controller functional diagrams, what should be the operational status of the unit if the actual box temperature is -18.0°C? Illustration GS-RA-035