VRF Top Flow

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


Cooling Only and Heat Pump VRF systems

Choose from Cooling Only for buildings which require cooling all-year round, or Heat Pump systems which can operate in either Heating or Cooling mode – suitable for new builds and refurbs replacing fossil fuel heating with renewables.

Cut your energy consumption and carbon footprint in half[1]

Compared with VRF technology of just 15 years ago it uses half the electricity[1] and equivalent CO2 emissions[2] from electricity production. The all-new heat exchanger and gas injection scroll compressor enable best-in-class efficiency up to Cooling[3] EER 5.50 and Heating[3] COP 5.21. Combine up to 4 outdoor units to create a modular system of up to 120HP[4] capacity with individual modules from 8HP to 28HP. Compressor rotation control manages equal loading on multi-ODU configurations, ensuring equal lifespan. In rare cases of compressor failure, emergency operation mode auto activates enabling compressors from other outdoor units to take up the workload and ensure continued operation.

Save space and lower delivery & installation costs

Enables more rooftop space for on-site renewables or greening by using fewer units, each with up to 28% smaller footprint[5], so they easily fit in an elevator potentially saving craning costs, while more units can fit on a single delivery truck. The use of fewer outdoor units is possible because you can connect indoor unit capacity totaling up to 200% of the outdoor capacity. Install outdoor units out of sight with support for piping lengths of up to 200m and 110m height difference. Multiple steps of External Static Pressure enable installation in well-ventilated plant or machine rooms which have open louvres to the outside, reducing impact on the external façade of buildings.

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

4X faster[6] to configure ODUs and 2X faster[7] 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[8] by holding a smartphone against the outside of the ODU instead of opening the unit cover and connecting to the PCB.

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.

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[5] than the previous generation.

39% more efficient under part load conditions[9]

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.

Gas-injection scroll compressor

Since inventing the world’s first scroll compressor back in 1983, our latest gas injection model enables precise 10 to 140rps (by 0.1Hz step) control driven by a DC inverter motor, and has an extended operating range for increased heating/cooling capacity at a wider ambient temperature range.

Affordable indoor air quality upgrades

Optional Ionizer Kit for Ducted indoor units is 99.9% effective on inhibiting SARS-CoV-2[10] and more than 99% effective on a range of viruses and bacteria[11].

Enhance occupant comfort

With CrowdSense[12] technology, select units can determine how many people are in a space and adjust the cooling or heating capacity accordingly, so the room will never get too hot or cold, whether it’s crowded or almost empty.

In room heating scenarios, it’s common to hear users complain of cold feet because heat naturally rises. FeetWarm[13] 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[13] 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.

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[8]
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[9]
the electricity consumption[1] and CO2 emissions[2] of VRF just 15 years ago


[1] 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.
[2] The CO2 emissions coefficient is 0.441 kg-CO2 /kWh. Based on Electric Power Industry Council for a Low Carbon Society in FY20
[3] Refers to air365 Max Heat Pump models.
[4] Refers to air365 Max Cooling Only models.
[5] Comparing Hitachi Set Free Sigma 28HP system with air365 Max 28HP system. Similar footprint reductions achieved across all capacities.
[6] 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.
[7] 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.
[8] 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.
[9] 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).
[10] Refers to Ionizer Kit test conducted Aug/Sept 2020 at Nara Medical University. Ozone Density : 0.1ppm. Tested Sample: Ozone generator which keeps 0.5~3.0 ppm emission in a space of 6.7L after 3 min generation. Host Cells: VeroE6/TMPRSS2. Washing-out Solution: SCDLP medium. Testing Condition: 19.6~21.8℃, 50.0~59.7%RH (Humidity) . Infectivity Measurement Method: Virus Plaque Assay.
[11] For example, [Escherichia coli] [Staphylococcus aureus], [Influenzas virus] and others. Numerous tests on various products.
[12] Requires optional motion sensor kit available for many Cassette and Suspended Ceiling models.
[13] Available on select Cassette models. Requires optional cassette panel with Motion Sensor & Radiant Temperature Sensor.

Choose your Hitachi Cooling & Heating System

Hitachi VRF systems for multi zone 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.