Question 85Refrigeration & AC - Assistant Engineer
70% to passWhen a refrigeration system is being topped off with a small amount of refrigerant through the low side with the compressor running, what should be done?
Athe refrigerant should be charged into the system as a vapor
Bthe refrigerant charging cylinder should be turned upside down
Cthe discharge service valve must be front seated
Dthe suction service valve must be back seated
AI Explanation
The correct answer is A) the refrigerant should be charged into the system as a vapor. When topping off a refrigeration system with a small amount of refrigerant, it is important to charge the refrigerant in a vapor state. This ensures that the refrigerant mixes properly with the existing refrigerant in the system and circulates effectively. Charging the refrigerant as a liquid could lead to liquid slugging, which can damage the compressor. The other options are incorrect because: B) turning the charging cylinder upside down would introduce liquid refrigerant, C) the discharge valve does not need to be front seated, and D) the suction valve does not need to be back seated when simply topping off the system.
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