Question 13Refrigeration & AC - 1st Asst/Chief
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 discharge service valve must be front seated
Bthe refrigerant charging cylinder should be turned upside down
Cthe refrigerant should be charged into the system as a vapor
Dthe suction service valve must be back seated
AI Explanation
The correct answer is C) 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 as a vapor rather than a liquid. Charging liquid refrigerant into the low side can damage the compressor. The vapor will properly mix with the existing refrigerant in the system. Charging as a vapor ensures the refrigerant is distributed evenly and absorbed properly, without causing any harm to the compressor. The other options are incorrect because they are not the proper procedure for safely topping off a refrigeration system.
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