According to my knowledge, fluorination needs to be operated on the low pressure side of the refrigerant, and the high pressure pipe is the compressor exhaust pipe that supplies the refrigerant. Under normal circumstances, we do not add refrigerant directly from the high-pressure pipe into the air conditioning system. When fluorinating, we need to connect to the low pressure side (usually the suction line) for operation. Therefore, it is recommended that you find professional air conditioning maintenance personnel to operate when adding fluoride to ensure safety and correctness.
Do not add refrigerant R410a from a high pressure pipe to a variable frequency air conditioner. When adding refrigerant to a general variable frequency air conditioner, it should be operated from a low pressure pipe, that is, it is charged through a low pressure valve. When adding refrigerant, follow the standard refrigerant charging procedure and contact professional air conditioner maintenance personnel.