Date: 04-09-2026
In commercial projects such as offices, restaurants, retail stores, or manufacturing plants, choosing a Hitachi PAC system is a top solution preferred by many investors and contractors. However, to ensure maximum operating efficiency, energy savings, and extended lifespan, accurate capacity calculation and proper placement of the outdoor unit are crucial. Join U.P Tech in exploring the detailed technical criteria and secrets to optimally installing a Hitachi air conditioning system in the following article.
The concept and importance of installing a Hitachi PAC system correctly
Hitachi PAC (Packaged Air Conditioner) systems are high-capacity commercial split air conditioners. These products are optimally designed for medium to large spaces requiring powerful cooling, high durability, and reasonable operating costs.
For contractors and project owners, designing and installing according to technical standards brings many practical benefits:
- Optimizing cooling performance: This helps distribute cool air evenly, meeting the heat load requirements of each area.
- Save on energy costs: Inverter compressors automatically adjust the frequency according to the actual load, significantly reducing energy loss.
- Extend the lifespan of your equipment: Reducing the strain on the compressor minimizes disruptions during business operations.
- Convenient for maintenance work: The scientifically designed arrangement of the outdoor and indoor units makes it easier for technicians to perform regular inspections and cleaning.
→ See more: Hitachi Commercial Air Conditioners: Advantages & Applications
The secret to calculating and selecting the appropriate Hitachi PAC system capacity for each project
Choosing the wrong capacity is a major cause of overloading or wasted initial investment costs. Depending on the area, space volume, and specific heat load characteristics, Hitachi PAC systems offer a wide range of capacities from 18,000 BTU/h to 55,000 BTU/h (equivalent to 1.8 HP to 6.5 HP).
Basic power calculation formula
The required cooling capacity is usually calculated based on the room volume or usable area:
- Formulas based on area: P = S x (600 ÷ 800) BTU/h (where S is the area in m2).
- Formulas based on volume: P = V x (200 ÷ 250) BTU/h/m3 (applicable for ceilings higher than 3m).
Calculate capacity according to building type
- Office and meeting room space (25m² - 40m²): Choose a capacity of 18,000 - 25,000 BTU (2.0 - 3.0 HP) to create a quiet working environment with stable temperature.
- Chain of cafes, restaurants & showrooms (45m² - 60m²): Due to the constant flow of customers and high heat generation, the appropriate power capacity should be selected. 30,000 - 36,000 BTU (3.5 - 4.0 HP) is required to ensure rapid cooling.
- Open space, Supermarket & Event Center (65m² - 90m²): High capacity of 42,000 - 54,000 BTU (5.0 - 6.0 HP) is required for continuous air circulation and large-area cooling.
Optimize interior design with a variety of air conditioning units
- RCI (Recessed Cassette Indoor Unit): 360-degree airflow provides safe and aesthetically pleasing coverage for luxurious offices or showrooms.
- Concealed ceiling ducted indoor units (RPIL/RPIM): With a slim profile of just 190mm and a flexible static pressure (ESP) of up to 150Pa, it allows for flexible duct connections to multiple points in narrow ceiling designs or complex finished ceilings.
- Ceiling-mounted indoor unit (RPFC): A cost-effective construction solution for projects that don't require false ceilings but still ensure strong and far-reaching airflow.
→ See more: Why should small and medium-sized offices with open spaces choose Hitachi commercial air conditioners?
Optimizing the location and installation techniques of Hitachi PAC system outdoor units
The outdoor unit plays a core role in the air conditioning system. Choosing the installation location for the outdoor unit of a Hitachi PAC system requires ensuring good heat dissipation, mechanical safety, and convenient connection.
Take advantage of flexible pipeline spacing
Hitachi commercial air conditioners boast a superior duct design:
- Maximum pipe length: Allows connection distance of up to 50m between the outdoor and indoor units.
- Maximum height difference: Reaching up to 30m, it allows for easy placement of the outdoor unit on the rooftop or technical floor without compromising performance.
Ensure adequate heat dissipation and ventilation
Although Hitachi outdoor units are capable of sustained cooling at ambient temperatures up to 48°C, technicians still need to adhere to placement guidelines:
- Place the outdoor unit in a well-ventilated area, avoiding direct sunlight or areas with stagnant air.
- Ensure a minimum distance of 1000mm from the outdoor unit's blower fan to any obstructions in front, and a minimum of 300mm behind and to either side.
- When installing multiple outdoor units, it is necessary to maintain distance between them to avoid the re-entry of hot air escaping from adjacent units.
Increased durability and environmental resistance
Hitachi outdoor units are equipped with many advanced protection technologies suitable for harsh climates:
- Hydrophilic Blue Fin heatsink: A special blue anti-corrosion coating prevents water accumulation, reduces dust buildup, and protects against corrosion from sea salt or humid air.
- Fireproof and insect-proof control box: The PCB board is protected in a sealed metal enclosure that can withstand temperatures up to 85°C, and a 0.5mm thick protective casing prevents cockroaches and rodents from entering.
- Refrigerant leak detection sensor: The system automatically shuts off when the R32 gas level drops below 30%, protecting the compressor from damage due to overheating.
U.P Tech – A leading and reputable distributor and installer of Hitachi PAC systems
Choosing Hitachi PAC systems for commercial projects requires contractors and design consultants to collaborate with a professional distributor. U.P Tech is proud to be a trusted partner specializing in providing genuine Hitachi air conditioning solutions with a commitment to absolute quality.
By partnering with U.P Tech, B2B customers and contractors will receive:
- In-depth technical consultation: Our team of HVAC engineers has in-depth product knowledge, assists in calculating heat load, and develops optimal installation plans.
- 100% genuine product: Fully certified with CO and CQ certificates, using environmentally friendly R32 refrigerant.
- Comprehensive solutions & competitive costs: We offer optimal pricing for your project, fast delivery times, and reliable after-sales service.
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Contact U.P Tech via the hotline today to receive a consultation and the best quote for your project!
U.P. TECHNOLOGY AND TRADING CO., LTD.
Hotline: 1800 6202
Email: vu@uptech.com.vn
Website: https://uptech.com.vn
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