Question 108Refrigeration/AC - 1st Asst/Chief70% 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 low-side pressure drops below a preset level, usually to protect the compressor from operating under a vacuum. This helps maintain the appropriate suction pressure and prevents the compressor from drawing in too little refrigerant, which could lead to mechanical failure. The other options, while related to refrigeration system operation, do not accurately describe the primary purpose of the low pressure cut-out switch.
Related Questions
#106 A liquid line solenoid valve controls refrigerant flow to the evaporator by what means? #107 A box solenoid valve used in a multi-box refrigeration system is operated by electromagnetic action by what control device? #109 Which of the listed operations will cause an automatically controlled refrigeration compressor to restart if the system features a pump-down cycle? #110 The 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? #111 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