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A6V11545892_en--_c
Min
Minimum damper position (P455)
W
IAQ setpoint (P023)
IAQ
The damper position depends on CO
than the setpoint (P023), damper is open.
In dead zone (no H/C demand), damper does not open, and fan does not run until
CO
concentration reaches IAQ setpoint + ½ of the P-band.
2
DC damper can be connected directly to the terminal U1 of thermostat or controlled
via S-Mode object 102: DC damper demand.
IAQ control with On/Off damper: P453 = 2 or 3
If On/Off damper control is selected, the following parameters can be used:
•
P453: Indoor air quality damper (2 = On/Off (normally open), 3 = On/Off
(normally closed))
•
P456: IAQ fan P-band Xp
•
P357, P353: Fan min. output
•
P359 & P360, P355: Fan max. output
The following graphics show the IAQ control by running the fan, in applications with
On/Off damper.
DC fan
W
IAQ setpoint (P023)
IAQ
Fan_min
Min. DC 0...10 V fan speed (P357)
If CO
(IAQ) concentration is higher than the setpoint (P023), damper is fully open.
2
The hysteresis of the damper is fix to 100 ppm. The 3-speed fan switch off point is
100 ppm below the switch on point.
In dead zone (no H/C demand), damper does not open, and fan does not run until
CO
concentration reaches IAQ setpoint.
2
On/Off damper can be connected directly to the terminal Q3 or Y4 of thermostat
(see IAQ - CO2 connection diagrams [➙ 159]) or controlled via S-Mode object 103:
On/Off damper demand.
Additional functions
IAQ damper Xp
IAQ damper P-band Xp (P454)
Fan_min
Min. DC 0...10 V fan speed (P357)
value. If CO
(IAQ) concentration is higher
2
2
1-speed/3-speed fan
IAQ fan Xp
IAQ damper P-band Xp (P456)
Fan_max
Max. DC 0...10 V fan speed (P359 for
heating & P360 for cooling)
Functions
4
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