As the TTC supply air diffuser has all of the sensors built in to the diffuser and does not require any installation on the walls, extremely high flexibility and simple management are obtained when walls are to be built, moved or removed. The fact that the sensors are not wall-mounted also gives a quicker time constant on the temperature sensor, and tampering is avoided. Normally, the installations in the ceiling are prepared for a module dimension of 2400 mm at the façade, but inside the building it is usual to think more in terms of open plan even at a later stage. (CO2 sensors are not required in an open plan office).


The TTC supply air diffuser controls the ventilation with the help of the built-in sensor for occupancy, temperature and flow (also pressure). When the room is empty, the system goes into economy mode, returning to comfort mode when the occupancy detector is triggered (after an adjustable time delay). The flow is then raised to an "occupancy flow" (typically 10-12 l/s); when there is excess heat the air flow increases to achieve the right temperature. For maximum energy saving, strongly under-temperature air is used to reduce the fan electricity consumption as the flow becomes lower.


The design of the diffuser means that the diffuser can reduce very high pressures without noise problems, which means that it is suitable for renovation projects where existing ducts can be exploited without risk of excessively high noise levels.


The diffuser can control heating in sequence with radiator actuators and also functions with thermostats, but it can then be more difficult to exploit economy mode when the office is not occupied; there can also be a risk that heating and cooling will operate simultaneously. However, this scenario can be easily detected with our web server LINDINSPECT.
TTC can also work with over-temperature air with good mixing, but if the supply air temperature cannot be adapted for different parts of the property, this tends to be a rather "insensitive" solution.


Lighting control in a larger space can be done in a number of ways. If high flexibility is required, the CBR relay box is used at each supply air diffuser. If a simpler solution is required, the SBR relay box is used, which communicates and can be placed anywhere on the bus line and connected to any defined lighting zone.

Standby kill switch

Standby use constitutes approx. 50-100 kWh/m2 per year. Controlling this with a timer and cutting the power between 23:30 and 06:00 means that a large share of the savings are lost. With our wireless controller units WTR and WRS, electrical outlets can be controlled with the occupancy sensor in the diffuser and then maximum savings can be made.

Open plan office with supply air via the TTC active supply air diffuser that uses a built-in regulator and sensor to regulate temperature and air quantity in the room by increasing or decreasing the slot size between the blades in the diffuser section. Pressure and flow sensors and encoders on the motor ensure extremely accurate flow regulation and make possible pressure optimization of the aggregate. The flow is set at three different levels: absence, occupancy and maximum flow. The built-in occupancy detector also controls economy and comfort modes after an adjustable time delay.
Extract air

Extract air with DCV-FB damper control with flow balance regulation through the flow that is communicated by digital bus. Adjustable offset can compensate for fast flow.


Via the CBX connection box, the supply air diffuser regulates the A4004 valve actuator on the radiator. Adjustable cold draught protection. The flow temperature and circulation pump on/off for heating can be optimized. Either each radiator is connected to the closest supply air diffuser so that future division of the room will be straightforward, or several radiators are connected in parallel to a CBX box and all diffusers are programmed to belong to the same temperature zone.

Extra heating/cooling steps

Further heating or cooling steps can be connected in the CBX box for extreme operating modes.

Extra sensors

CO2 or air quality sensors can be connected in the CBX box. This input can also be used for other sensors if required. The sensor signal is used to regulate an adjustable P band.


The CBR lighting control box or SBR is used to connect push buttons and 230 VAC to the lighting. The lighting is turned on and off either via a signal from the occupancy sensor placed in the supply air diffuser or from connected push buttons. The time to automatic switch-on (one operating mode) can be set, as can the time to switch-off after the last recorded movement. The number of on and off operations and the number of hours with lighting illuminated are registered for measurement of the number of burning hours for the armature and thereby the optimal time for replacing fluorescent tubes.

The cable used throughout is a PVC-free shielded combined supply and communication cable. It is pre-terminated in the diffuser's diffuser section with ready-made contacts in the other end for rapid installation. For other products, it is connected in the same way throughout.

Cable lengths
The bus cable can be pulled for long distances in respect of communication, but the voltage drop must be taken into account for power supply. See electricity design guide.

The limiting factor for cable length is that each CMA ("communication hub") can only have 100 nodes/products installed on it.

Power supply and transformers
In a normal situation, one transformer is installed per 12-15 diffusers/products but this is a rule of thumb that applies with short distances between products. See electricity design guide.

In some cases, you may wish to place a larger transformer in cable recesses instead of many smaller ones deployed throughout the installation. This can be done, but you must take note of the voltage drop in cables, and you will need separate thick 24 VAC cables on cable ladders...

Different installation principles for easiest/cheapest installation
Instead of pulling the cable on a ladder outside the cellular office, you can pull the cable in line into the room to avoid having to go in and out of the room.

If the CBR box is to be installed for lighting control, it is useful to use some kind of FMP bracket assembly product for pre-assembly and shorter installation times. An SBR box can be placed anywhere on the bus line.

As long as the cooling capacity is set to a maximum of 80 W/m2, there is no problem with draughts in the occupied zone. With a recommended distance of approx. 3000 mm between centers of two diffusers, there is no problem with draughts.