• Interfacing VRF systems
  • Interfacing VRF systems

Interfacing VRF systems

HVAC applications and control


Variable Refrigerant Flow (VRF) systems are used in the summer and winter air conditioning of buildings and in the production of domestic hot water.

They are based on the expansion of the refrigerant fluid that passes through the heat exchange terminals (indoor units); in this way the transformations of the fluid (evaporation in cooling and condensation in heating) take place directly in the room through the exchange coils.

Ekinex devices Other system components
A) Time / astronomical digital switch EK-TM1-TP 1) Outdoor units (VRF system)
B) GPS module EK-GPS-1 2) Indoor units (VRF system)
C) Room thermostat EK-E12-TP  
D) Room thermostat EK-EP2-TP  
E) Multisensor EK-ET2-TP  
F) Presence sensor EK-Dx2-TP  
G) CoolMasterNet gateway EK-BQ1-TP  
Control with Ekinex

VRF systems generally have their own bus system for communication between the various devices making up them; thanks to the EK-BQ1-TP gateway (G) it is possible to interface ekinex control devices, such as EK-TM1-TP (A) time / astronomic digital switches, EK-EQ2-TP (C) or EK-E72-TP (D) room thermostats, EK-ET2-TP (E) multisensors or EK-DF2-TP (F) presence sensors, to the communication bus dedicated to air conditioning systems realised with VRF and split heat exchange terminals.

Among the controls* that the gateway (G) provides on the KNX side are for example:

  • on / off
  • mode (Cool, Heat, Auto, Fan)
  • fan speed
  • temperature setpoint
  • feedback of room temperature
  • error code

The device supports systems of the following manufacturers: Mitsubishi Electric, Daikin, Toshiba, Panasonic, Sanyo, Hitachi, Mitsubishi Heavy Industries, LG, Samsung, and Gree.

*) Some control options may be restricted by manufacturers.

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