CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E
18
FRESH AIR DAMPER - Free-Cooling
Function
Ensure a minimum fresh air introduction into the room and/or a free-cooling, thus reducing electric consumption.
Description
MINIMUM FRESH AIR
Adjustment by set point
The fresh air rate is adjustable by set point.
3312 ! Minimum opening of the fresh air damper, %, adjustment by zone.
Adjustment by free contacts (optional)
With the customized free contacts, the fresh air rate can be adjusted. (see Customized Input / Output (BE.50))
• With a free contact on [0% F.A.]) The contact closing will close completely the damper.
• With a free contact on [100% F.A.] The contact closing will open completely the damper.
• With a free contact on [10% F.A.], [20% F.A.], [30% F.A.], [40% F.A.] or [50% F.A.] The contact closing will open the
damper to the mentioned rate.
If several contacts are customized with this functionality, the air damper will open according to the sum value of all closed
contacts.
In any case, the minimum fresh air rate will be fixed according to the highest value between the set point and the request
by contacts.
Adjustment by external signal (optional)
The minimum fresh air can be remotely modified by a signal 4-20mA. (See Customized Input / Output (BE.50))
For a signal of 4 mA applied on [F.A Offset] the threshold is set to 0%
For a signal of 20 mA applied on [F.A Offset] the threshold is set to 100%
A linear rule is applied between the two limits.
Air quality sensor, CO² (optional)
If a CO² sensor is connected to the unit, the minimum value of fresh air is calculated according to the CO² rate.
This functionality can be activated, or not, within the 4 day zones.
Two opening mode may be selected:
• Fresh air damper opening between 0% and the minimum fresh air set point [0-Min]
• Fresh air damper opening between the minimum fresh air set point and the maximum fresh air set point. [Min-max]
0
2000 ppm
Set point
3513
Set point
3514
Minimum
Fresf Ai
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