UAB KOMFOVENT we reserve the right to make changes without prior notice
C5.1-20-05
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2.5.4.1. Air handling unit settings
Temperature control
The air handling unit provides for several temperature control modes:
• Supply. The unit supplies air according to the temperature preset by the user.
• Extract. Unit automatically supplies air of such temperature to maintain preset
exhaust air temperature.
• Room. Operation is similar to the mode “exhaust” but temperature is main-
tained by the sensor mounted in the room (B8).
• Balance. Supply air temperature maintenance value will be determined auto-
matically from the existing exhaust air temperature, i. e., what temperature air will
be removed from the premises, the same temperature air will be supplied back.
When “Balance” is selected, the temperature setpoint disappears.
Air volume control
Supply and exhaust air volumes control modes have been provided in the unit:
• CAV
– constant air volume control mode. The unit will supply and extract a constant air flow which is preset
by the user, irrespective of any changes occurring in the ventilation system;
• VAV
– variable air volume control mode. The unit will supply and extract an air flow with regard to the
ventilation needs in different rooms. In case of frequently changing ventilation demands this air volumes
maintenance mode signally reduces unit exploitation costs.
It is possible to use a simplified VAV control function, “single-flow VAV control”. It means that the perfor
-
mance of this function requires only a single air flow pressure sensor, which is installed in a variable air duct
system (e. g. in supply air). This variable system is called the master ventilation system, according to which
control is performed, while the other air flow (in this case, discharged air) operates as the slave ventilation
system and always follows the master one. If the supply air requirement in the ventilation system which is
assigned as the master system decreases, the intensity of discharged air in the slave system is reduced
correspondingly by the same percentage.
If the variable air volume control function is mode is selected, the initial
calibration of the control mode must be performed; otherwise, the unit
will not operate if the VAV mode is selected.
Variable air volume control mode calibration:
1. Before start of calibration the air distribution and exhaust devices in ventilation system should be adjusted,
all valves for variable air flow in a way enabling air supply to all ventilated premises should be opened.
2. After switch on of the unit the VAV mode should be selected and calibration procedure should be confirmed.
After the end of the calibration, depending on the configuration of pressure sensors, VAV mode status will
change to Supply, Extract, Double.
3. After calibration the air handling unit further will operate in the previous mode.
• DCV
– direct controlled volume. The air handling unit will operate similarly as in the CAV mode, but air
volumes will be maintained directly in accordance with the values of the B6 and B7 analog input signals
of controller. After giving the signal 0... 10 V to the appropriate input, it will be converted according to the
current determined air volume. For example, if the maximum air flow of the unit is 1000 m
3
/h, setpoint in the
panel – 800 m
3
/h, and the B6 input value – 7 V, the unit will supply constant air volume of 560 m
3
/h, i. e.,
70 % of the set value. The same applies to the exhaust air only by B7 input.
Reset settings
Air handling unit
Temperature control
Flow control
Time/Date
Connectivity
