C6-17-08
UAB AMALVA we reserve the right to make changes without prior notice
33
• VAV – variable air volume control mode. The unit will supply and exhaust the air volume depending on the
ventilation needs in different rooms, i.e., the constant pressure in the system will be maintained by the vari
-
able air volumes. After selecting the VAV flow control, the user will have to set the pressure maintained by
the ventilation system for each of the four modes.
This function requires additional VAV sensors, which must be ordered sepa
-
rately. The connection of the sensor is shown in Fig. 1.3b.
If you select the VAV flow regime, the automatic air quality support will be
disabled. The AUTO button will activate the weekly operation schedule.
• DCV – Directly 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 500 m
3
/h, setpoint in the
panel – 250 m
3
/h, and the B6 input value – 7 V, the unit will supply constant air volume of 175 m
3
/h, i. e.,
70 % of the set value. The same applies to the exhaust air only by B7 input.
With special modes (KITCHEN, FIREPLACE, OVERRIDE and HOLIDAYS)
the unit will always operate only in the CAV mode, regardless of the selected
flow control.
After selecting the “Balance” mode, the temperature setting will disappear.
Flow control.
Supply and exhaust air flow control modes:
• CAV – constant air flow control mode. The unit supplies and exhausts a constant air volume set by the user,
regardless of the pollution condition of the air filters and the ventilation system changes.
When activating the air handling unit for the first time, the air flow state
-
ments may differ from the real flow until the end of the air flow calibration
process. The adaptation process may take up to one hour before all the
parameters become stable.
Airflow maintenance mode
CAV
Correction of delivered airflow
0 m
3
/h
Correction of exhaust airflow
0 m
3
/h
Airflow maintenance
When CAV (or DCV) airflow maintenance mode is selected, there is the
possibility to correct the delivered and exhaust airflows by +/-30% for actual air
quantity developed by device after automatic calibration wouldn’t coincide with
those set in the control panel.
Correction of airflow may be entered only if operation mode
of ventilation device is steady. It is recommended to enter
the correction when the ventilation intensity level is not less
than 50%
