Equipment in a examination room to control ventilation, cooling, heating and lighting via the active supply air diffuser TTC.

An examination room equipped with Lindinvent's active supply air diffuser TTC. TTC offers a solution where the climate can be adapted using the variable supply air flow and logic to control connected valve actuators.


TTC controls the ventilation using built-in sensors for presence, temperature and flow (also pressure). The amount of air in the room is controlled by actively increasing or decreasing the height between the lamellas in the diffuser air outlet section. Pressure and flow sensors together with an encoder on the damper motor ensure accurate flow control. The flow is set based on 3 different flow levels: minimum flow, presence flow and maximum flow. Without attendance, the room goes into economy mode, i.e. to a minimum flow. When presence is detected, the flow is increased to the presence flow (typically 30 l / s). In case of excess heat or high CO2 content (requires that a CO2 sensor is installed), the air flow is increased up to the maximum flow to reach set points. The built-in presence detector is used for activation after an adjustable time delay. In order to minimize the energy consumption, strongly sub-tempered air is used which reduces the need for electricity for fans.

Extract air

The smart damper DCV-BL is used for extract air balancing. Air flows are communicated and shared with other active units via the communication loop. A compensation/offset for fixed air flows can be set.

Additional heat or cooling

A set of adjustable P-bands is used by TTC to regulate the room's climate in a way that avoids parallel heating and cooling. TTC activates the actuators for heat (SV) when the supply air cannot keep the climate in accordance with set points. No additional cooling system is installed. A draft protection function can be implemented.


Signals from sensors are used to regulate the room climate according to set points and adjustable P-bands.


The TTC supply air device can flexibly control the lighting of the spring room via the presence sensor or via signals from other control units. If a more advanced lighting solution is desired, with scenes etc., lighting control SBD can be used for a DALI solution.


The cable in use for linking units to a communication loop (CAN bus) is a PVC-free shielded 4-conductor combined supply and communication cable. Relay boxes and sensors etc are normally connected via connection box CBX using the same cable specification. The 4-conductors are used for power supply and signals when applicable.

Cable lengths

The CAN bus cable can be pulled long distances with respect to communication, but, for power supply to be at acceptable levels, voltage drop must be considered. See the electrical design guide.

Power supply and transformers

In a normal situation, one 230/24VAC transformer is installed per 12 to 15 diffusers/nodes on the CAN-bus section. This is a rule of thumb that applies at short distances between products. See the electricity design guide for details.

Pre-assembled smart dampers

Circular designs of the smart damper DCV-BL (as well as other circular smart dampers) are supplied with the regulator and the damper motor pre-mounted on the circular damper with measuring flange. The unit only requires connection of the controller to the combined feed and communication loop.

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