Date: 23-10-2026
When exploring Hitachi home air conditioning, users may come across model codes beginning with RAK or RAC. These two codes are used to identify the corresponding components of a wall-mounted split air conditioning system. So, what is RAK/RAC, what do these codes mean, and how can you distinguish them accurately when selecting equipment? Let's explore the details with U.P Tech in the article below.
What is RAK/RAC?
RAK/RAC are codes used by Hitachi in the model numbers of wall-mounted split air conditioning systems (Split Air Conditioner). RAK identifies the indoor unit installed inside the room, while RAC identifies the outdoor unit installed outside the building. A typical wall-mounted split air conditioning system consists of two main units connected through refrigerant piping and electrical wiring according to the design requirements of each model.
RAK (Indoor Unit): The code used to identify Hitachi wall-mounted indoor units, which exchange heat with indoor air, distribute airflow, and help maintain the set temperature.
RAC (Outdoor Unit): The code used to identify Hitachi outdoor units, which contain essential components of the refrigeration cycle, such as the compressor and outdoor heat exchanger, enabling the system to transfer heat.
Meaning of RAK and RAC codes in Hitachi air conditioners
The RAK/RAC codes are used in the model numbers of Hitachi wall-mounted air conditioners, helping identify individual units and supporting the lookup of technical equipment information. Specifically, these codes serve three main purposes:
Equipment identification: RAK is the prefix used to identify indoor units installed inside rooms, while RAC identifies outdoor units installed outside. This allows users to distinguish between the two components through their model numbers.
Product information lookup: The RAK/RAC codes help identify the correct equipment type when searching through Hitachi catalogues, technical documents, or product listings. Combined with the remaining characters in the model number, users can look up the specifications and features of each specific model.
Compatibility verification: RAK and RAC model numbers provide a basis for checking indoor and outdoor unit configurations against Hitachi's technical documentation, ensuring that the selected units form a compatible combination approved by the manufacturer.
Differences between RAK and RAC in Hitachi air conditioning systems
| Criteria | RAK – Indoor Unit | RAC – Outdoor Unit |
| Code | RAK | RAC |
| Other name | Indoor Unit | Outdoor Unit |
| Installation location | Inside the room | Outside the building |
| Main function | Exchanges heat with indoor air | Compresses refrigerant and exchanges heat with the outdoor environment |
| Key components | Heat exchanger, fan, air louvers, sensors | Compressor, heat exchanger, cooling fan |
| Installation requirements | Suitable room size, airflow distribution position, and condensate drainage | Adequate ventilation, technical clearances, and convenient maintenance access |
| Connection | Connects to a compatible outdoor unit | Connects to a compatible indoor unit |
It is important to note that not every RAK indoor unit can be paired with every RAC outdoor unit. Compatibility depends on the product series, cooling capacity, refrigerant type, control system, and other relevant technical specifications. For detailed information about RAK/RAC codes and assistance in selecting a suitable Hitachi air conditioning, please contact U.P Tech – The exclusive authorized distributor of genuine Hitachi air conditioners in Vietnam for professional consultation and support.
List of Hitachi RAK/RAC product lines
Hitachi RAK/RAC product lines are distinguished by their corresponding RAK indoor unit and RAC outdoor unit model numbers. Depending on the wall-mounted air conditioner series, the equipment may vary in cooling capacity, operating technology, and integrated features. Below is a list of Hitachi air conditioning product lines distributed by U.P Tech, helping customers identify and explore suitable equipment configurations.
- Hitachi airHome 100: A cooling-only Non-Inverter air conditioner designed to meet basic cooling needs, featuring functions such as rapid cooling, dehumidification, and internal drying support for the indoor unit.
- Hitachi airHome 300: An Inverter air conditioner equipped with FrostWash self-cleaning technology, helping maintain heat exchange efficiency and providing convenience during operation.
- Hitachi airHome 400: An Inverter air conditioner integrating cleaning support features and operating controls, suitable for cooling needs in residential spaces.
- Hitachi airHome 500: A premium Inverter air conditioner combining adjustable cooling capacity with comfort features and smart control capabilities.
- Hitachi airHome 600: A premium heating and cooling Inverter air conditioner that meets both cooling and heating needs while supporting control through the airCloud Go application.
- Hitachi Inverter XJ CKV series: Equipped with Inverter technology and FrostWash self-cleaning functionality, helping maintain the indoor unit's operating performance.
- Hitachi heating and cooling Inverter XJ series: Combines cooling and heating functions, suitable for areas requiring seasonal temperature adjustments.
- Hitachi premium Inverter VJ series: An air conditioning series focusing on cooling performance, temperature control, and comfort features.
- Hitachi Non-Inverter EJ series: Uses a fixed-speed compressor to meet basic cooling needs in residential spaces.
- Hitachi Inverter XJ CMV series: Combines Inverter technology, FrostWash functionality, and air filtration solutions.
- Hitachi Inverter PJ CMV series: Equipped with Inverter technology and cleaning and air filtration support features, meeting everyday usage needs.
| >>> See more: List of RAC product lines currently distributed by U.P Tech. |
Conclusion
Based on the information above, RAK/RAC are codes used to identify indoor and outdoor units in Hitachi wall-mounted split air conditioning systems. Understanding the meaning of each code helps users distinguish between components, accurately look up model numbers, and verify equipment compatibility when selecting an air conditioning system.
In addition, Hitachi offers a wide range of wall-mounted air conditioners with different cooling capacities, technologies, and features to meet various usage requirements. For more information about Hitachi RAK/RAC product lines or assistance in selecting suitable equipment, please contact U.P Tech – The exclusive authorized distributor of genuine Hitachi air conditioners in Vietnam for detailed consultation and support.
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U.P. TECHNOLOGY AND TRADING CO., LTD.
Hotline: 1800 6202
Email: vu@uptech.com.vn
Website: https://uptech.com.vn
Head Office: D6, Thuan Viet Commercial Area, 319 Ly Thuong Kiet Street, Phu Tho Ward, Ho Chi Minh City, Vietnam.
Ho Chi Minh City Transaction Office: 370 Cach Mang Thang 8 Street, Nhieu Loc Ward, Ho Chi Minh City, Vietnam.
Hanoi Transaction Office: 14th Floor, ADI Building, Lot HH03, To Huu Street, Ha Dong Ward, Hanoi, Vietnam.
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Explore premier Hitachi commercial air conditioner HVAC solutions for business, commercial buildings and industries.
Light Commercial Split Systems
Hitachi's light commercial split systems are 1:1 split AC systems designed for commercial applications, such as restaurants, banks, and small offices.
Hitachi Multi – Split Systems - Uptech
Hitachi commercial split AC systems are a cost-effective alternative to VRF systems, with lower installation complexity.
AC Apps & Controllers for home
Enjoy greater convenience thanks to our remote controllers for AC. Thanks to their intuitive interface everyone can create a perfect atmosphere.
Hitachi Home Air Conditioning
Hitachi Cooling & Heating residential air conditioners uniquely combine over 70 years of Japanese engineering heritage with the latest smart technology to support reliable, energy-efficient, and intuitive residential air conditioning solutions.
Hitachi Air Conditioning for Single Room - Room Air Conditioner
Hitachi Cooling and Heating offers a wide range of AC for individual rooms, with a solution for every room AC need.
Air365 max innovations
Discover our new VRF system: air365 Max (Heat Force). An innovative, energy-efficient and highly operational solution.
Revolutionary form factor inair conditioner airpure concept wins 2024 red dot design concept award
Revolutionary form factor in air conditioner: ‘airPure’ concept wins 2024 Red Dot Design Concept AwardConsidering the future of HVAC solutions in homes, the Consumer Design Team for Johnson Controls-Hitachi Air Conditioning products has been distinguished for their visionary design, transforming air conditioning into a purposeful interior design element.
