Question 85Refrigeration & AC - Assistant Engineer

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.