VRF Set Free Sigma Standard

Sigma VRF has been specially designed for easier installation, commissioning and maintenance. Its flexible modular system achieves higher power combinations from fewer units, requiring less space, fewer pipe connections and delivering an installer friendly experience. Improved energy efficiency is achieved with a new, revolutionary DC inverter scroll compressor, Sigma shaped heat exchanger and new fan design to improve air flow. All units are compatible with Hitachi’s System Free indoor units, including Hydro Free water modules, for the most flexible VRF system on the market. The outdoor units of the Hitachi VRF systems of the Set Free Sigma series are designed for premises for various purposes, for example, shopping centers and office buildings. The intelligent control of Set Free Sigma systems allows for independent and individual temperature control in different zones. The series systems allow you to quickly reach the desired temperature in the room, after which the temperature is smoothly regulated within the specified limits.

Hitachi exclusive GENTLECOOL feature enables every occupant to customise their own air off temperature control for unparalleled comfort and user productivity. Individual air off control can be set differently for every fan coil even on the same system, unlike most market offerings which set the air off control for the whole system. Actionable from both central controls and local wall mounted control means complaints about cold drafts will be a thing of the past. Smooth Drive Control increases performance at low load by operating down to 10% of system capacity with 0.1hz incremental control of the compressor. This ensures temperatures within conditioned spaces stay at the desired set point and units don’t cycle on and off yielding a 39% reduction in power consumption and reducing stress on the compressor for enhanced longevity and reliability.

Features and Benefits:
Market leading SCOP up to 5.06 and SEER up to 8.33
SINGLE BODY 24HP MODEL
Wide product range with single modules available from 8 to 24HP (standard) and 5 to 18HP (high efficiency)
Combine 4 base outdoor units to achieve up to 96HP with a single system
Smooth Drive Control adjusts outdoor unit capacity in 0.1Hz increments, expanding the working range down to 5% of maximum capacity for enhanced seasonal efficiency at part loads
User comfort ensured with variable refrigerant temperature and controllable off coil temperatures to eliminate cold draught
Extended height difference of up to 110m between indoor and outdoor units
Improved static pressure (80Pa) for outdoor unit installation flexibility
‘Smart Building’ ready for future proof installations
Low noise operation, down -14 db(A)
Efficient defrost cycles ensure continuous heating to enhance user comfort
Installation flexibility with indoor units up 150% capacity of outdoor
Market leading low refrigerant charge
Motion sensor for up to 14% energy savings with System Free cassettes, ceiling suspended and ducted indoor units
Cooling to -10 Degrees Celsius
Heating to -15 Degrees Celsius

Advantages of external blocks HITACHI VRF Set Free Sigma:
High seasonal energy efficiency even at partial loads
Outdoor units can be used both as part of two-pipe and as part of three-pipe systems
A wide operating temperature range gives more freedom when designing air conditioning systems
More options for installing outdoor units indoors or behind louvers
Shorter piping length
Lower installation cost
Aesthetic appearance of the building
Maximum equivalent piping length 190 m
The maximum length from the first refnet to the longitudinal indoor unit is 90 m
Height difference between outdoor and indoor units up to 110 m
Height difference between indoor units 30 m
Maximum equivalent piping length 190 m
The maximum length from the first refnet to the longitudinal indoor unit is 90 m
Height difference between outdoor and indoor units up to 110 m
Height difference between indoor units 30 m
High performance and efficiency
Specially designed compressor with DC inverter with speed control accuracy of 0.1Hz
Extended frequency range