Chapter 84 covers nuclear reactors, boilers, machinery, mechanical appliances and parts thereof, and is one of the broadest and most technologically advanced chapters in the HS classification. This chapter includes power machinery, pumps, fans, air conditioning equipment, refrigeration equipment, filtering and purifying apparatus, machine tools, office equipment, etc. Its core characteristic is that goods must have mechanical motion or energy conversion functions, rather than being purely electrical products (Chapter 85) or optical instruments (Chapter 90). For air conditioners, the key difference between Chapter 84 and Chapter 85 is that equipment with a mechanical refrigeration cycle as its core is classified under Chapter 84, while purely electric heating appliances or temperature control devices relying only on electrical control may be classified under Chapter 85. Heading 8415 specifically refers to air conditioning machines, i.e., equipment that simultaneously has temperature regulation (cooling or heating) and humidity regulation functions, and usually includes a refrigeration unit, a reversing valve, a fan, and controls. This heading covers window type, split type, cabinet type, central air conditioning, and other air conditioning machines, whether or not they are installed independently. The key determining point is whether they contain a refrigeration unit (such as a compressor, condenser, evaporator) and a reversing valve (such as a four-way valve). If they only have ventilation or filtering functions, they are classified under 8414 or 8421; if they only have electric heating functions, they are classified under 8516. Code 841581 is a six-digit subheading. The first 2 digits '84' represent Chapter 84 (machinery, mechanical appliances and parts), indicating that the goods belong to mechanical equipment rather than electrical equipment. Digits 3-4 '15' represent heading 8415 (air conditioning machines), covering all air conditioning equipment with cooling and humidity regulation functions. Digits 5-6 '81' represent subheading 841581, further limited to 'air conditioning machines with a refrigeration unit and a reversing valve,' i.e., air conditioners with a reversible refrigeration cycle (heat pump function), capable of switching refrigerant flow through a four-way valve or similar to achieve conversion between cooling and heating modes. This subheading is distinguished from 841582 (with refrigeration unit only, without reversing valve) and 841583 (without refrigeration unit, ventilation only). The goods are classified under 841581 mainly because they simultaneously have a refrigeration unit and a reversing valve. The refrigeration unit (such as a compressor, condenser, evaporator) indicates that they have active cooling capability; the reversing valve (such as a four-way reversing valve) indicates that they can switch between cooling and heating modes, i.e., heat pump function. If the reversing valve is absent and they can only cool, they are classified under 841582; if the refrigeration unit is not of the mechanical compression type (such as absorption type), they are classified under other subheadings of 8415; if they only have electric heating functions, they are classified under 8516. Therefore, 841581 is a subheading specifically set for reversible-cycle air conditioners.

Product Name: The standard name of the declared goods, which should include brand, model, and function description, such as 'split heat pump air conditioner.' Brand: Fill in the product brand, such as Gree, Midea, Daikin, etc.; if there is no brand, fill in 'no brand.' Model: Fill in the specific model, such as KFR-35GW, used to distinguish specifications and functions. Cooling Capacity: Fill in the rated cooling capacity in kilowatts (kW), reflecting the air conditioner's capacity. Heating Capacity: Fill in the rated heating capacity in kilowatts (kW), proving the heat pump function. Whether It Contains a Reversing Valve: Clearly declare whether it contains a four-way reversing valve or other cooling/heating switching device; fill in 'yes' or 'no.' Refrigerant Type: Fill in the refrigerant name, such as R32, R410A, R290, etc., involving environmental regulation. Use: Fill in the usage scenario, such as household, commercial, computer room dedicated, etc. Product Name: Split heat pump air conditioner; Brand: Gree; Model: KFR-35GW/NhAa1B; Cooling Capacity: 3.5kW; Heating Capacity: 4.0kW; Whether It Contains a Reversing Valve: Yes; Refrigerant Type: R32; Use: Household. Mistakenly understanding 'reversing valve' as an ordinary valve and failing to declare its function, leading to classification errors. Incorrect unit for cooling capacity or heating capacity, such as mistakenly writing kW as W, causing data deviation. Refrigerant type not specifically declared in accordance with environmental requirements, which may affect customs clearance or involve licenses.

The core basis for classification lies in whether the goods simultaneously have a refrigeration unit and a reversing valve. The refrigeration unit is usually of the mechanical compression type, including a compressor, condenser, evaporator, and throttling device. The reversing valve (such as a four-way reversing valve) is used to switch refrigerant flow to achieve conversion between cooling and heating modes. If the reversing valve is absent, classification is under 841582; if the refrigeration unit is absorption or adsorption type, classification is under other subheadings of 8415; if only electric heating is available, classification is under 8516. In addition, if an air conditioner is combined with ventilation or filtering devices, it is still classified according to its main function. 841582 Other air conditioning machines with a refrigeration unit: 841582 has only cooling function, no reversing valve, and cannot heat; while 841581 has cooling/heating switching function and can heat. 841583 Air conditioning machines without a refrigeration unit: 841583 has only ventilation, humidity regulation, and other functions, without a mechanical refrigeration unit; while 841581 must contain a refrigeration unit. 841510 Window or wall type air conditioning machines: 841510 is a self-contained air conditioner, but if it has a reversing valve, it should still be classified under 841581; if it only cools, it is classified under 841582. 851610 Electric water heaters and immersion heaters: 851610 is electric heating equipment without a mechanical refrigeration unit; while 841581 is a mechanical compression heat pump air conditioner. 847960 Evaporative air coolers: 847960 uses water evaporation for cooling and has no compressor refrigeration; while 841581 uses a mechanical compression refrigeration cycle. Does the goods contain a mechanical refrigeration unit such as a compressor? Does the goods contain a cooling/heating switching device such as a four-way reversing valve? Does the goods have both cooling and heating functions? Is the goods used for air temperature regulation? Is the goods not of the electric heating or evaporative cooling type?

How to determine whether an air conditioner is classified under 841581? The key is whether it simultaneously has a refrigeration unit and a reversing valve. The refrigeration unit is usually a compressor, condenser, evaporator; the reversing valve, such as a four-way reversing valve, is used to switch refrigerant flow to achieve heating. If both are present, it is classified under 841581; if it can only cool, it is classified under 841582. What is the difference in classification between a heat pump air conditioner and an ordinary air conditioner? A heat pump air conditioner has a reversing valve and can switch between cooling and heating modes, so it is classified under 841581; an ordinary single-cooling air conditioner has no reversing valve and is classified under 841582. The two differ in energy efficiency and function, and must be strictly distinguished during classification. How should the refrigerant type be filled in during declaration? The specific chemical model should be filled in, such as R32, R410A, R290, etc., and it cannot be generally written as 'Freon.' Different refrigerants involve environmental regulation and license requirements; for example, R22 requires an import license for ozone-depleting substances. How should a central air conditioning system be classified? If a central air conditioner consists of multiple indoor units and one outdoor unit, and the outdoor unit has a refrigeration unit and a reversing valve, the entire set is classified under 841581. If it only cools, it is classified under 841582. If it is absorption-type refrigeration, it is classified under other subheadings of 8415. Which code is a mobile air conditioner classified under? If a mobile air conditioner has a refrigeration unit and a reversing valve, it is classified under 841581; if it only cools, it is classified under 841582. Attention should be paid to whether it is a unitary design, but the classification principle remains unchanged. Does an air conditioner with electric auxiliary heating affect classification? No. As long as the main functions are mechanical compression cooling and heat pump heating, electric auxiliary heating is only supplementary, and it is still classified under 841581. However, if heating relies only on electric heating and there is no mechanical refrigeration unit, it is classified under 8516. How should imported used air conditioners be declared? Used air conditioners need to declare product name, brand, model, cooling capacity, heating capacity, whether they contain a reversing valve, refrigerant type, etc., and may require a pre-shipment inspection certificate. The classification principle is the same as for new products, but environmental and energy efficiency requirements should be noted. How to query the tariff rate for 841581? It can be queried through the official website of the General Administration of Customs of China or the International Trade Single Window by entering HS code 841581 to view the MFN rate, general rate, VAT rate, and regulatory conditions. Tariff rates may be adjusted, and the latest published version shall prevail.