(2) Place the cylinder on the scale. Use a special thread to connect one end to the cylinder and the other end to the multi-purpose port of the compressor suction valve. Do not tighten the nut of the multi-purpose port for the time being, first open the cylinder valve a little, and then close it immediately, drain the air in the pipe, and then tighten the nut.

(3) Freon is filled in the form of wet vapor, so it is necessary to properly open the cylinder valve to prevent liquid shock from the compressor. At the same time, unscrew the multi-purpose orifice of the compressor suction valve to start filling with refrigerant. If the system is in a vacuum condition, the refrigerant in the cylinder will be automatically injected into the system, and when the pressure in the system is equal to the pressure in the cylinder, the refrigerant will stop entering. At this time, if the amount of refrigerant in the system has not been added, you can first close the cylinder valve, the outlet valve of the accumulator, the manual expansion valve and the suction valve of the compressor, start the cooling water pump of the condenser, and then start the compressor. In order to prevent the liquid from hitting the cylinder, the suction valve should be opened slowly, and the refrigerant in the commercial refrigeration system should be pumped into the accumulator. The low pressure part of the system is evacuated again, and then the cylinder valve is opened to allow the refrigerant to be automatically filled again system. This is repeated until the amount of refrigerant required by the system is added. After the system is evacuated again, you can open the outlet valve of the accumulator and the small expansion valve to let the system operate normally, then open the cylinder valve, and gradually close the suction valve (that is, open the multi-purpose port) to cool the cylinder. The agent relies on the difference between the pressure in the bottle and the suction pressure to flow into the system (note that no liquid strike can occur).

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