– FSXNP/ FSXNS SET FREE Σ Heat Recovery VRF
FSXNS - Space saving | FSXNP - High efficiency
When the air around you is in balance, you can enjoy life indoors that much more.

– Multi Branch Boxes - Heat Recovery
Allowing the freedom to design layouts as desired
- Multi-Port CH-Box (up to 16 ports)
- Liquid-piping built-in design
- No drain-piping needed
- Top-in-class compact body
- Top-in-class lightweight unit
- Height difference between
CH-Box to IDU extended up to 40m
- Multi-Port CH-Box (up to 16 ports)
- Liquid-piping built-in design
- No drain-piping needed
- Top-in-class compact body
- Top-in-class lightweight unit
- Height difference between
CH-Box to IDU extended up to 40m

– Central Mini Controller - for Small scale buildings
5.0-inch wide colour LCD (full dot) touch panel
- Group 32
- Block 4 patterns (2/4/8/16)
- Indoor Unit 160
- Outdoor Unit 64
- Group 32
- Block 4 patterns (2/4/8/16)
- Indoor Unit 160
- Outdoor Unit 64

– Central EZ Controller - for Medium scale buildings
8.5" wide Colour LCD (full dot) touch panel display controls
- Groups 64
- Indoor Unit 160
- Outdoor Unit 64
- Groups 64
- Indoor Unit 160
- Outdoor Unit 64

– Central EX Controller - for Large Scale buildings
Aa highly intuitive and functional 12.1" wide colour touch screen that provides you with total control and energy management for up to 2,560 indoor units.
Acquire data using SD memory and USB flash devices - upload your own floor layout images. Easily arrange indoor units by dragging them on the touch panel - web browser interface. Three long-term category settings: annual, summer & winter.
Acquire data using SD memory and USB flash devices - upload your own floor layout images. Easily arrange indoor units by dragging them on the touch panel - web browser interface. Three long-term category settings: annual, summer & winter.

– Wide Range of Indoor Units
For indoor areas, where we are free to shape our environment, our extensive line-up of indoor units gives you the flexibility to design perfect air in any space, with concealed and compact units allowing for uninterrupted aesthetics.
Sigma VRF has a wide range and capacity of indoor units including:
- 4-way ceiling cassettes
- Low profile ducted
- Mid ESP ducted
- High ESP ducted
- Wallmounted systems
- Under ceiling
- Full fresh air
- O/A heat exchangers
Sigma VRF has a wide range and capacity of indoor units including:
- 4-way ceiling cassettes
- Low profile ducted
- Mid ESP ducted
- High ESP ducted
- Wallmounted systems
- Under ceiling
- Full fresh air
- O/A heat exchangers

– Local Control
Advanced local control capabilities
- Half degree temperature setting
- Fan speed control
- Louvre control
- Mode control
- 24/7 time clock
- Room temperature display
- Power visualisation
- Half degree temperature setting
- Fan speed control
- Louvre control
- Mode control
- 24/7 time clock
- Room temperature display
- Power visualisation

– Shape your environment
Well designed cooling and heating should allow the best use of indoor and outdoor spaces.
The new SET FREE Σ outdoor units feature an ultra-compact footprint, so they can be placed discreetly out of sight or configured to optimise space usage.
The new SET FREE Σ outdoor units feature an ultra-compact footprint, so they can be placed discreetly out of sight or configured to optimise space usage.

– Shape your environment
Well designed cooling and heating should allow the best use of indoor and outdoor spaces.
The new SET FREE Σ outdoor units feature an ultra-compact footprint, so they can be placed discreetly out of sight or configured to optimise space usage.
The new SET FREE Σ outdoor units feature an ultra-compact footprint, so they can be placed discreetly out of sight or configured to optimise space usage.
– Living Harmony

– VRF System Management made easy with airCloud Pro
Enjoy the freedom of remote access to manage your VRF system(s) from a single interface, accessible via a smartphone app or web-based portal on a computer.
Hitachi airCloud Pro enables building owners and facilitators to monitor and control their commercial heating and cooling air conditioning system(s) through the Cloud via an IoT gateway device. This multiplatform application offers a centralised control overview of any building’s HVAC system.
Find out more about airCloud Pro here.
Hitachi airCloud Pro enables building owners and facilitators to monitor and control their commercial heating and cooling air conditioning system(s) through the Cloud via an IoT gateway device. This multiplatform application offers a centralised control overview of any building’s HVAC system.
Find out more about airCloud Pro here.
– Space saving series
Space saving series
Single Module 8 ~ 24 | Two Modules 26 ~ 48 | Three Modules 50 ~ 54 |
---|

Nominal Capacity | Cooling | kW |
Nominal Capacity | Heating | kW |
Maximum Connectable indoor Unit Quantity |
Capacity Connection Ratio Between Indoor and Outdoor Units | % |
Maximum Total Piping Length | m |
Maximum Piping Length Between Indoor and Outdoor Units | m |
Maximum Piping Length from first branch to furtherest indoor unit | m |
Maximum Height Difference Between Indoor and Outdoor Units | Outdoor above | m |
Outdoor below | m |
Maximum Level Difference between Indoor Units | m |
Outdoor temperature Operating Range - Cooling | °CDB |
Outdoor temperature Operating Range - Simultaneous Operation | °CDB |
Outdoor temperature Operating Range - Heating | CWB |
22.4 ~ 67.0 |
25.0 ~ 77.5 |
8 ~ 40 |
50 ~ 130% |
1000 |
165 |
90 |
110 |
40 |
15 |
[-10] ~ 48 |
[-10] ~ 24 |
[-20] ~ 15 |
73.0 ~ 136.0 |
82.5 ~ 150.0 |
43 ~ 64 |
50 ~ 130% |
1000 |
165 |
90 |
110 |
40 |
15 |
[-10] ~ 48 |
[-10] ~ 24 |
[-20] ~ 15 |
140.0 ~ 150.0 |
155.0 ~ 165.0 |
64 |
50 ~ 130% |
1000 |
165 |
90 |
110 |
40 |
15 |
[-10] ~ 48 |
[-10] ~ 24 |
[-20] ~ 15 |
– Documentation
Manuals, brochures and other product literature. If you need any more information, please get in touch.
– Space saving series
Space saving series
Single Module 8 ~ 24 | Two Modules 26 ~ 48 | Three Modules 50 ~ 54 |
---|

Nominal Capacity | Cooling | kW |
Nominal Capacity | Heating | kW |
Maximum Connectable indoor Unit Quantity |
Capacity Connection Ratio Between Indoor and Outdoor Units | % |
Maximum Total Piping Length | m |
Maximum Piping Length Between Indoor and Outdoor Units | m |
Maximum Piping Length from first branch to furtherest indoor unit | m |
Maximum Height Difference Between Indoor and Outdoor Units | Outdoor above | m |
Outdoor below | m |
Maximum Level Difference between Indoor Units | m |
Outdoor temperature Operating Range - Cooling | °CDB |
Outdoor temperature Operating Range - Simultaneous Operation | °CDB |
Outdoor temperature Operating Range - Heating | CWB |
22.4 ~ 67.0 |
25.0 ~ 77.5 |
8 ~ 40 |
50 ~ 130% |
1000 |
165 |
90 |
110 |
40 |
15 |
[-10] ~ 48 |
[-10] ~ 24 |
[-20] ~ 15 |
73.0 ~ 136.0 |
82.5 ~ 150.0 |
43 ~ 64 |
50 ~ 130% |
1000 |
165 |
90 |
110 |
40 |
15 |
[-10] ~ 48 |
[-10] ~ 24 |
[-20] ~ 15 |
140.0 ~ 150.0 |
155.0 ~ 165.0 |
64 |
50 ~ 130% |
1000 |
165 |
90 |
110 |
40 |
15 |
[-10] ~ 48 |
[-10] ~ 24 |
[-20] ~ 15 |