With the high level of heat recovery of up to 95%, extract air in the counterflow heat exchanger undergoes intense cooling. This may, under certain conditions, cause moisture in the extract air to condense in the exchanger. If this occurs, the condensation will then be collected in a condensation tray, where a swimmer automatically records how much water there is. The unit is fitted with an automatic condensation management process, which means that in rooms with normal humidity, such as offices, meeting rooms and classrooms, it is not typically necessary to connect a condensation drain.
When ventilating rooms with high humidity, the condensation can be directed away from the unit to a drain to prevent outages, for example by fitting the unit with a fully automatic condensation pump.
Automatic condensation management process
If the condensation water reaches a certain level it activates the swimmer and the controlling automatically starts the condensation management process. The process shuts down the supply fan and raise the extraction fan to 100 % airflow trying to eliminate the condensation water. The process runs 20 minutes and will retry 4 times. If the condensation management process is effective and eliminate the condensation water, it will clear the condensation alarm. If it does not have an effect, the air handling unit will stop. The condensation alarm will still appear, and the water has to be removed manually before the air handling unit can start again.
Built-in float sensor detects
unwanted build-up of condensate.
Airmaster’s decentralised ventilation units are also designed to function optimally in cold regions such as in northern Scandinavia and Greenland, where a large number of units are already in operation.
The ventilation units have built-in intelligent control processes which automatically regulate components and can adjust the operation of the unit, if necessary, to frost-proof the unit, or to maintain the desired supply temperature during periods of low outdoor temperatures.
To achieve the highest level of heat recovery, Airmaster air handling units are fitted with highly-efficient counterflow heat exchangers. A comfort current is therefore used only to equalise the minimal heat loss from ventilation. A heating element is therefore only used to offset the minimal heat loss during ventilation, ensuring that full operation can be maintained, even in cold geographical regions. Balanced ventilation is maintained as long as the inlet temperature remains within acceptable limits as standard.
If the inlet temperature cannot be maintained at low fresh temperatures, Airlinq will reduce inlet air and increase extract air to compensate for the low temperature.
The function is also active if comfort heating surface capacity is utilised 100%. This function means that in certain climates the comfort heating surface is not required.
Most air handling units can have a water heating surface fitted as an alternative to an electric comfort heating surface. A water heating surface also ensures the required inlet temperature. The large surface area of the heating surface ensures efficient transfer of heat energy to the inlet air.
The Airlinq control system starts and stops the heating surface using a motor-driven valve. The heating surface is supplied built-in to the air handling unit, or as part of the duct system. Connection to the local heating system is therefore quick and simple.
The water heating surface is fitted with a separate, self-controlling heat retention valve, which ensures a minimum temperature even when the air handling unit is switched off. All nominal values for the water heating surface are preprogrammed into the Airlinq control system. The heating surface is therefore protected against frost and is directly functional.
Water heating surface
Most air handling units can control the airflow using flow control. Flow control means that the airflow is stated in m3/h and ensures balanced operation, at varying pressure difference on the supply and extract air. To convert airflow to m3/h, a measuring nozzle is fitted inside the air handling unit between the fan and the main box, which measures the differential pressure.
The differential pressure is measured for the supply air and extract air respectively, and then converted to an airflow in m3/h.