Demand controlled ventilation can be obtained by means of various sensors. Controlling ventilation according to need provides both a high level of indoor air quality and reduces energy consumption.
In rooms where humans are the primary source of pollution, comfort ventilation is often controlled according to the CO2 concentration in the room as it is a good indicator of pollution caused by people and thus the need for a supply of fresh outdoor air.
A CO2 sensor measures the CO2 level in the room, and sends the reading to the control system. The control system then adjusts the rate of air replacement in the room according to the CO2 level, The unit’s energy consumption is reduced to the minimum.
The unit can be set to run with a reduce standard airflow (min.) for basic ventilation.
If the CO2 level in the room exceeds the programmed lower limit (A), the CO2 sensor will cut in and increase airflow.
If CO2 levels continue to rise, the airflow will be increased linearly up to the maximum volume (max.) at the upper CO2 limit (B) and above.
If the air handling unit is fully controlled by a CO2 sensor, it will start with standard airflow once the CO2 level
exceeds the programmed limit, plus + 10% (A + 10 %).
If the CO2 level continues to increase in the room, the airflow is increased linearly, up to the maximum
airflow at the CO2 level’s upper limit (B) and above.
If the CO2 level falls below the programmed lower limit (A), the air handling unit stops again.
If the air handling unit is started by a timer and the CO2 limit continues to exceed the lower limit (A), the air
handling unit will continue even after the programmed stop, until the CO2 level has fallen below the lower limit,
to ensure a good indoor climate.
The air handling unit is set to start/stop via a signal from a motion sensor. The motion sensor registers motion within its detection field and sends a signal to the unit to start. The unit will start in normal operation with the programmed airflow and inlet temperature.
When the signal ceases, the unit will stop after the preprogrammed afterrun time. A motion sensor is often used to switch the unit from basic ventilation to normal operation when anyone enters the detection field.
A motion sensor ensures the lowest energy consumption possible, as ventilation only starts when there is motion in the room.
Variable afterrun time can be programmed in the Airlinq control system.
We deliver units all over Europe.
Consequently, we know that our units have to function effectively under very different outside temperatures.
Airmaster air handling units can be fitted with an extra humidity sensor or extended programming.
Integrated humidity and temperature sensors on supply and extract make exact calculation of absolute air humidity possible.
The adaptive humidity control automatically prevents the air drying out in the winter and reduces humidity in the summer. This effective, energy-saving form of operation creates a healthy environment and a healthy energy bill.
A hygrostat registers relative air humidity, and sends either a start or stop signal to the air handling unit. Start/stop signal can be adjusted. Humidity in the air affects the length of hygroscopic man-made fibres. Depending on the humidity level, the fibres
will activate a contact that triggers the signal. When the relative air humidity goes over or under the level set, the hygrostat sends a start/stop signal to the air handling unit. Hygrostats are often used to switch a unit from basic ventilation to full operation when the
relative humidity set is exceeded.
The hygrostat ensures that humidity is automatically kept down. Can be installed in the room or on the unit.