VRF Top Flow

Large capacity VRF systems for projects that require high standards of energy efficiency, and easy installation, commissioning and maintenance.


Heat Recovery systems with individual modules up to 24HP

Allows simultaneous cooling and heating in different zones by transferring waste heat from a zone being cooled to a zone that requires heating. Ideal for buildings where spaces have different levels of sun exposure especially during seasonal changes, and those with unequal occupancy in different zones – for example meeting rooms, public areas, rooms of different sizes, classrooms, halls, etc. Combine up to 3 modules of 8 to 24HP[1] to create systems up to 64HP.

Best-in-class efficiency up to Cooling AEER 4.63

Compared with VRF technology of just 15 years ago it uses half the electricity[2] and equivalent CO2 emissions[3] from electricity production. The all-new heat exchanger and gas injection scroll compressor enable best-in-class efficiency up to Cooling AEER 4.63 and Heating ACOP 4.43[4]. Hitachi's direct capacity control technology SmoothDrive 2.0 utilizes precise temperature monitoring and control of the scroll compressor frequency to reduce compressor on/off cycles under part-load conditions. SmoothDrive 2.0 is up to 39% more energy efficient under the part-load conditions that regulatory energy efficiency ratings do not account for[5].

Sigma-shaped (Σ) heat exchanger – 100 years in the making​

With more than 100 years expertise in heat exchanger design, our latest high-performance sigma-shaped (Σ) version has around 6000 pieces of aluminum fins, each with a complex surface structure, around 350 copper tubes with textured inner structure, and a new 3-way path structure through the entire HEX. These designs all work together to increase the heat-transfer area and therefore efficiency of the unit, even in a unit which is up to 28% smaller footprint[6] than the previous generation.

airCloud Tap - 4x faster to configure systems, 6x faster to access data

4X faster[7] to configure ODUs and 2X faster[8] to configure IDUs using the airCloud Tap mobile app and NFC technology embedded in outdoor units and wired remote controllers. All settings are available with convenient descriptions inside the phone app. Installers and building operators can 'copy and paste' settings for one ODU (or IDU via individual controller) to multiple units using their phone, making it ideal for large buildings with many rooms. airCloud Tap app also enables a technician to access to operational data 6X faster[9] by holding a smartphone against the outside of the ODU instead of opening the unit cover and connecting to the PCB.

Enhance occupant comfort

In room cooling scenarios, our proprietary technology GentleCool can assure your perfect indoor comfort without any cold draft, since you can select not only room temperature but also the exact air temperature used to reach the room temperature, thereby reducing cold drafts.

In room heating scenarios, it’s common to hear users complain of cold feet because heat naturally rises. FeetWarm[10] helps to solve this problem by optimizing airflow in heating mode to ensure that the leg zone is consistently heated. In cooling scenarios, FloorSense Cool[10] can prevent the floor area from overcooling by controlling airflow and cooling capacity so that the air at floor level does not get as cool as air above knee height.

Easy to operate & automate with airCloud Pro

Remote monitoring and energy optimization using airCloud Pro web-based software or smartphone app. Group indoor units into custom zones to control with a single touch, visualize and compare energy consumption of different rooms or zones at different times of the day, helping to identify opportunities for energy savings. Automate operation based on business hours with advanced timers, automatically notify a HVAC professional in the event of a system failure, and much more besides.

Highlight Benefits

access to operational data by holding a smartphone against the outside of the ODU instead of opening the unit cover and connecting to the PCB[9]
aluminum fins, each with a complex surface structure, inside the sigma-shaped (Σ) heat exchanger
more energy efficient under the part-load conditions that regulatory energy efficiency ratings do not account for with SmoothDrive 2.0 technology[5]
the electricity consumption[2] and CO2 emissions[3] of VRF just 15 years ago


[1] Refers to air365 Max models.
[2] Comparison of a system equivalent to 10HP class (28.0kW), between [RAS-FSN Hitachi inverter VRF of 15years ago] VS [air365 Max RAS-HNCC**]. 15 year old model = 8,349kWh/year. air365 Max 4,419kWh/year = 47% saving. Based on simulation of seasonal power consumption & CO2 emissions JIS B 8616: 2015 (Tokyo office). Cooling: Apr-19 to Nov-11. Heating Dec-3 to Mar-15.m. Application: office. AC usage: 6days/week, 8am-8pm.​
[3] The CO2 emissions coefficient is 0.441 kg-CO2 /kWh. Based on Electric Power Industry Council for a Low Carbon Society in FY20​.
[4] Refers to air365 Max Pro models.
[5] Testing Condition (at Cooling Operation, Load Factor: Approx. 33%) Without SmoothDrive; average power consumption 2.46kW / With SmoothDrive; average power consumption 1.49kW. VRF ODU:(RAS-AP280DG3 = RAS-10FSNS) & VRF IDU: 4-way cassette indoor units (RCI-AP140K5 = RCI-5.0FSRP) & Indoor Unit Inlet Temperature: 27°C (Dry Bulb) / 19°C (Wet Bulb) Ambient Temperature at Air Volume “High”: 23°C (Dry Bulb) / Piping Length between Indoor Unit and Outdoor Unit: 15m / Testing Location: Environment Testing Facility at Kansai Denryoku (power supply company).
[6] Comparing Hitachi Set Free Sigma 28HP system with air365 Max 28HP system. Similar footprint reductions achieved across all capacities.
[7] Conventional way to open and close the cover and manipulate dip/power switch takes 40min 40sec. By using airCloud Tap without opening the cabinets: takes 9min 40 sec. [Simulation scenario] total 4 ODUs initial setting. total 5 items setup; ODU number, Refrigerant cycle number, Higher ESP setting, Power Supply setting, and Compressor manual-off setting.​
[8] Conventional way takes 103min 16sec. By using airCloud Tap: takes 47min 40 sec. [Simulation scenario] Total 20 controller setting. Total 7 items of setup: Room name, Time, Language, Temperature unit, Backlight of the screen, Operation schedule from Monday to Friday 08:30~18:30 28°C , Upper and lower limit of setting temperature for both cooling and heating​.
[9] Test simulation scenario: Check the alarm cause. [Previously] open up the cabinet panel, open the electricity box cabinet panel, check the PCB error code, close the 2 cabinet panels. Requires minimum 3mins. [with airCloud Tap] open the airCloud Tap application, TAP the outdoor unit to access all settings and download operational data. Requires approx. 30secs.​
[10] Available on 4-way cassette model only. Requires optional Twin-sense panel.

Choose your Hitachi Cooling & Heating System

Hitachi VRF systems for multi zone commercial climate control

Our range of cooling and heating solutions provides households and businesses with the leading climate control technology to create and maintain the perfect indoor environment. Our advanced VRF solutions for multi zone cooling and business applications offer the versatility that each project requires, as well as unbeatable efficiency and reliability. Our collection of elegant and efficient options are designed to adapt to you and the spaces that they inhabit.

To see more of our ranges, click here, and if you are interested in receiving more information from a professional installer, find your nearest one using our Partner Locator.