IVAR.645 - dependent electronic control

The IVAR.645 dependent electronic control is designed for integration into two-pipe fan coil units. It works in conjunction with the IVAR.649 controller to manage heating and cooling operations. This system continuously adjusts fan speed and controls water inlet valves based on sensor data from the heating water inlet and ambient air temperature. Up to 30 fan coils can be controlled by a single IVAR.649 unit, making it suitable for medium-scale HVAC installations.

Typical applications include commercial and residential buildings where precise temperature control is required. The system is ideal for use in two-pipe systems where heating and cooling are alternated rather than operated simultaneously.

How to choose

• Ensure compatibility with the IVAR.649 controller for system integration.
• Confirm the supply voltage is 230 V, 50 Hz as specified for the electronics board.
• Verify the system is intended for two-pipe fan coil units only.
• Check that the control module can interface with the required temperature and flow sensors.

Frequently asked questions

Can the IVAR.645 be used with more than one IVAR.649 controller?
No, each IVAR.649 controller is designed to manage up to 30 fan coils with IVAR.645 controls. Additional controllers are required for larger systems.

Is the IVAR.645 suitable for four-pipe systems?
No, the IVAR.645 is specifically designed for two-pipe systems. For four-pipe systems, a different control unit is required.