Question 99Refrigeration & AC - Assistant Engineer
70% to passWhen recovering the remaining R-134a refrigerant from the centrifugal chiller shown in the illustration as a vapor using the recovery unit’s compressor, in addition to opening valves "1a", "1b", and the compressor suction and discharge isolation valves, which of the following would be the correct valve lineup? Illustration GS-RA-28
Avalves "2", "5", "7", "8", and "10" open; valves "3", "4", and "6" closed
Bvalves "3", "4", and "6" open; valves "2", "5", "7", "8", and "10" closed
Cvalves "3", "4", "7", "6" and "10" open; valves "2", "5", and "8" closed
Dvalves "3", "5", and "6" open; valves "2", "4", "7", "8", and "10" closed
AI Explanation
The correct answer is B) valves "3", "4", and "6" open; valves "2", "5", "7", "8", and "10" closed. This is the correct answer because when recovering the remaining R-134a refrigerant from the centrifugal chiller as a vapor, the recovery process requires the compressor suction and discharge isolation valves to be open, along with valves "3", "4", and "6". This allows the refrigerant vapor to be drawn into the recovery unit's compressor for proper containment and disposal. The other answer choices are incorrect because they either have the wrong valves open or closed, which would not allow the proper flow of refrigerant vapor to the recovery unit for safe handling.
Related Questions
Q136:If a refrigeration compressor were short cycling on the low-pressure cutout swit... Q129:If a refrigeration system, equipped with a reciprocating compressor, has a liqui... Q187:In refrigeration systems with multiple evaporators, the metering of refrigerant ... Q218:What is the purpose of the low-pressure cut-out switch as used as a primary cont... Q12:In general, the thermal bulb for a thermal expansion valve used in a reciprocati...
Ready to test your knowledge?
Take a Refrigeration & AC - Assistant Engineer Practice ExamOfficial Resources