Danfoss Electronics spa
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
55
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 defined in P03 with its relative differential P04 and a setpoint for the VOC control is
defined in P05 with its relative differential P06.
Fig 50_ [Air quality control - Air quality control]
