Control - for IVAR fan coils - wall control thermostat - 12V; black IVAR.649

Product detailed description

The IVAR.649 wall thermostat is commonly used in commercial and residential buildings with fan coil systems. It is installed in rooms where precise temperature control is required, such as offices, retail spaces, and multi-family dwellings. The device is part of a two-pipe system and is used in conjunction with IVAR.645 electronic control units. Installers typically integrate it into HVAC systems to manage airflow and temperature efficiently, ensuring occupant comfort and system performance.

Its design allows for standalone mounting on a wall, with a dedicated data cable linking it to the control electronics. The thermostat provides real-time feedback on room temperature and system status, making it a key component in modern fan coil installations.

Technical parameters

Supply voltage	12V
Code	EEA649II
Brand	IVAR

The 12V power supply is essential for compatibility with the IVAR.645 control unit. This voltage level is typical for low-voltage HVAC systems and ensures safe and stable operation. The temperature range of 16 to 28°C in 0.5°C increments allows for fine-tuned control, suitable for spaces with varying thermal demands. The ability to control up to 30 fan coils from a single thermostat simplifies system management and reduces the need for multiple control points.Installation and connection The IVAR.649 is mounted on a wall using standard fixing methods. It requires a dedicated 12V power supply from the IVAR.645 control unit, which is connected via a shielded RS485 data cable. The cable must be routed carefully to avoid interference and ensure reliable communication. During installation, the technician should verify that the power supply is stable and that the data cable is correctly connected to the control unit. Common mistakes include incorrect cable routing, poor grounding, and failure to check the continuity of the data link before commissioning. The thermostat must be installed in a location free from direct sunlight and heat sources to ensure accurate temperature readings.Compatibility and accessories The IVAR.649 is specifically designed for use with IVAR fan coils equipped with the IVAR.645 control electronics. It is not compatible with other control systems or third-party fan coil units. For installations requiring remote monitoring or control, the EFA649II and EFB649II variants with built-in WiFi modules are available. These models integrate with the InnovaAPP for remote access and diagnostics. No additional accessories are required for basic operation, but installers should ensure that the control unit and power supply are correctly sized for the number of fan coils being controlled.Technical background for designers The IVAR.649 operates as a digital thermostat, using electronic sensors to monitor room temperature and send signals to the IVAR.645 control unit. The control unit then adjusts the fan speed and heating/cooling coil operation to maintain the desired temperature. The use of a 12V power supply minimizes electrical load and ensures compatibility with low-voltage HVAC systems. The RS485 communication protocol allows for reliable data transmission over long distances, making it suitable for large installations. The thermostat's housing is made of durable materials to withstand typical indoor conditions. Its integration into the system depends on the correct configuration of the control unit and the fan coil units, ensuring that all components operate in harmony.Service and operation The IVAR.649 requires minimal maintenance. Technicians should periodically check the power supply and data cable connections for signs of wear or damage. The display should be inspected for any error codes or unusual readings that may indicate a fault in the system. If the thermostat fails to respond to user inputs or displays incorrect temperature readings, the data cable and power supply should be checked first. No scheduled service intervals are specified in the technical documentation, but routine inspections are recommended to ensure continued performance.Frequently asked questions

Can the IVAR.649 be used with more than one control unit?
No, each IVAR.649 is connected to a single IVAR.645 control unit. Multiple thermostats can be used in a system, but each must be linked to its own control unit.

Is it possible to adjust the temperature in increments smaller than 0.5°C?
No, the thermostat allows temperature settings in 0.5°C increments as specified in the technical parameters.

Can the IVAR.649 be used with fan coils that do not have IVAR.645 electronics?
No, the thermostat is specifically designed for use with IVAR fan coils equipped with the IVAR.645 control unit. It is not compatible with other control systems.

How is the current room temperature displayed?
The actual room temperature is shown on the display after the desired temperature has been set. This allows the user to monitor the system's performance in real time.