Engine : Expired / Refrigeration AC - 38/252
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| When 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? |
| A) the refrigerant charging cylinder should be turned upside down |
| B) the refrigerant should be charged into the system as a vapor |
| C) the suction service valve must be back seated |
| D) the discharge service valve must be front seated |
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