Air Handling seq.- user manual
DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
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13| Air quality control
Control of the air quality is performed according to the readings detected by the C02 (carbon dioxide) and VOC
(Volatile Organic Compound) probes connected to the analog inputs “CO2 – CO2” and “VOC - VOC”. Without these
probes, it is still possible to achieve a timed air changeover.
AIR QUALITY CONTROL
AIR Air Quality Min Max Default U.M. Text value
ACH Air Change
P01 AirChange period 0 9999 5 MIN
P02 AirChange duration 0 9999 30 SEC
CO2 CO2-VOC Control
P03 CO2 setpoint 0 100,0 50,0 %
P04 CO2 prop. band 1 10,0 2,0 %
P05 VOC setpoint 0 100,0 50,0 %
P06 VOC prop. band 1 10,0 2,0 %
Tab 39_ [Air quality control - Air quality control]
Whether requested by the VOC or CO2 probes or set to be performed at certain intervals, air changeover has priority
over damper management. This means that the outside air damper can be opened even if the outside temperature
conditions are not favorable to freecooling/freeheating.
If both air quality measurement probes are not present, air changeover is regulated through P01, interval between
air changes, and P02 duration of the external damper opening.
If both probes, VOC and CO2, are present, the damper is controlled by the higher of the two signals detected.
A setpoint for CO2 control is dened in P03 with its relative dierential P04 and a setpoint for the VOC control is
dened in P05 with its relative dierential P06.
Fig 50_ [Air quality control - Air quality control]
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