Air Handling Unit Functions; Air Flow Control; Temperature Control - Komfovent Domekt Series User Manual

EN

2. AIR HANDLING UNIT FUNCTIONS

To create a comfortable home environment, you can adjust ventilation intensity and air temperature as well as to create a
weekly ventilation schedule. Various additional functions facilitate control of all ventilation processes and reduce electricity
consumption.

2.1. Air flow control

Fan speed of air handling units is adjusted by the selected air flow control method:
• CAV – constant air volume control. Fan speed is adjusted by measuring air flow and comparing it against the set value.
Fan rotates exactly at a speed required to reach the set air volume, regardless of pressure changes. For example, when
air filters get contaminated, the fan speed will be automatically increased to reach the same volume of air as during
operation with clean filters. In operating modes, the user sets a desired air volume for each fan separately. Air volume is
set and measured in m
• VAV – variable air volume control mode. This mode allows maintaining constant air pressure in ducts while the fan speed
is adjusting according to pressure changes in the ventilation system. Air pressure in ducts is measured with optional VAV
pressure sensors installed in supply and exhaust air ducts and connected to B6 and B7 terminals of the main controller
(see "Installation Manual"). User sets a desired air pressure value for supply and extracted air individually in operating
modes. Air pressure is set and measured in Pa.
• DCV – direct air volume control mode. This mode is quite similar to the CAV mode, but additionally allows adjustment
of fan speed by connecting a 0..10 V control signal to terminals B6 and B7 of the main board (see "Installation Manual").
As the control signal voltage changes, fan speed is adjusted accordingly, i.e. 10V corresponds to the set air volume value,
whereas, 2V corresponds to 20% of the fan power.
Selection of air flow control is described in chapter "Control and Settings".

2.2. Temperature control

Temperature in the air handling unit is maintained by measuring the actual temperature and comparing it to the user-
defined temperature. Then, depending on whether the supply air requires heating or cooling, heat exchanger or additional
heaters/coolers are activated. Available temperature control methods:
• Supply air temperature control – the unit supplies air of user-defined temperature.
• Extract air temperature control – the unit automatically selects the supply air temperature to ensure that the extract
air temperature is reached and maintained as quickly as possible. Room air temperature is measured by an integrated
extract air temperature sensor.
• Room temperature control – the unit automatically selects the temperature of supply air to ensure that the room
temperature is reached and maintained as measured by the sensor integrated in a remote controller. Control panel must
be installed in a room where temperature maintenance is required.
• Balance – Supplied air temperature will be maintained to be the same as extracted air temperature, therefore, selecting a
desired temperature is not possible. Extract air temperature is measured by an integrated extract air temperature sensor.
Selection of temperature control is described in chapter "Control and Settings".
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UAB KOMFOVENT we reserve the right to make changes without prior notice
C6M_GUIDE2-19-04