VRF Systems

Set Free Sigma

Σ stands for the mathematical sum of Johnson Controls and Hitachi VRF technologies. It is also a shape of the new heat exchanger, designed to have better air flow throughout the machine. The product is made to suit the customer’s requirements of higher efficiency, engineered aesthetics, enhanced strength, compact design, compact cooling & heating, etc.

Σ stands for the mathematical sum of Johnson Controls and Hitachi VRF technologies. It is also a shape of the new heat exchanger, designed to have better air flow throughout the machine. The product is made to suit the customer’s requirements of higher efficiency, engineered aesthetics, enhanced strength, compact design, compact cooling & heating, etc.

1. Enhanced Efficiency

  • Efficiency Ratio
EER:Energy Efficiency Ratio

2. Compressor Control

  • Greater capacity control
The highly improved performance as well as greater energy saving is achieved by adopting newly developed high efficiency DC inverter compressor, with outstandingly precise control technology of 0.1Hz increments inverter frequency. Another feature is the dramatically extended working range, enabled by expanding the compressor’s operating frequency band, both upwards and downwards.

3. Σ Shaped Heat Exchanger

  • The heat exchange area has been increased by more than 10% (single module)
  • Greater heat exchange efficiency

4. Air Outlet Design

  • Improvement of air flow volume by 23% (single module)
  • Energy consumption in the driving shaft has decreased by 20% on average

5. Improved External Static Pressure

More number of options for ESP setting (up to 4) and maximum up to 80Pa of outdoor unit, offer better options for the indoor installation of the outdoor unit, which leads to 3 benefits for you.
  • Less piping length
  • Lower installation cost
  • Visual aesthetics

6. Operation Temperature Range

Enhanced performance in consideration of the actual installation environment of the outdoor unit

7. Easy Transportation

  • Smaller cabinet
  • Can be transported in an elevator by pallet jack

8. Piping Connection Workability

  • Suitable for a high-rise building or complex facilities
  • Leads to cost/time saving for designers, with more efficient design

9. Improved Strength

Rigidity of front and back direction are further improved for less vibration.

10. Maintenance Ease

Maintenance Ease

11. Smooth Drive Function

The model calculates the appropriate amount of refrigerant supplied by the outdoor units on the basis of information about the required load from the individual indoor units. The model employs smooth operation control to control the number of revolutions of the inverter compressor. The model supplies the appropriate amount of refrigerant to the indoor units according to the required load. The model increases energy-saving efficiency by operating smoothly while controlling the switching on and off of the compressor at low-load operation.

12. Prevents Failure

Standardize the running time of the individual outdoor units and distribute the load by rotating the order of operation of the compressors of the outdoor units.

13. Backup Function

Full introduction of backup operation function. If one outdoor unit should fail, the model can continue to operate using the remaining outdoor units, thereby preventing total system failure.

documentation

downloads

Manuals, brochures and other product literature. If you need any more information, please get in touch.

where to buy

Search our network of authorised Hitachi distributors and installers.

Created with Sketch.

This website uses cookies. By continuing to browse the site you are agreeing to our cookie policy.