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The Daikin VRV-4 systems It is

A modular water-cooled air conditioning and heating system that distributes refrigerant from the outdoor unit to multiple indoor units, making it highly efficient and controllable on a zone-by-zone level. These systems are comprised of unified condensing units that require connecting a 2-pipe (heat pump applications) or 3-pipe (heat recovery applications) refrigerant systems. 

The connected indoor units can provide heating and cooling independently to suit zone requirements throughout a building, making it suitable for both open plan or cellular applications.

Main benefits of this system include:

- Compact design, making for easier transportation and installation and reducing labor cost when compared to traditional waterbased equipment.
- Typically require less base refrigerant charge than that of air-cooled systems, thus can be used in applications with limited allowable refrigerant within the building.
- Condensing units can be linked to existing water piping and utilize the existing heat source to reduce initial costs.
- No external operation sound produced by condensing units to disturb building tenants (since water-cooled VRV systems are installed indoors only).
- Can use lakes, rivers, and ground loops, using the Earth as a natural heat sink/heat source which eliminates the need for extra equipment.
- Water-cooled operation is not affected by outside air temperatures.
- Engineered with heat rejection cancellation technology to minimize heat addition to mechanical rooms.
- Variable water flow control
- Extended water temperature operation range: temperatures can be as low as 23 degrees in cooling and 14 degrees in heating.