Refrigerant will be generally released before shipment due to different Customs policy and vessel company, such as air conditoners to Russia, South Korean. But how to fill Refrigerant for Air Conditioner for your onsite? This video from Yitong will guide you step by step as a reference.
Before we share the video, please note that the filling process should be done by a professional in refrigeration area, especially he knows some basic thing and have experience in installing household air conditioner.