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Siemens
Synco™ living Operating instructions
CE1B2707en
Building Technologies
Central apartment unit QAX910
23.08.2008
Indoor air quality control
Indoor air quality is controlled to the setpoint of the current ventilation operat-
ing mode. The central apartment unit acquires air pollution, compares it to the
setpoint and switches between the ventilation stages as needed. The switch-
ing between the ventilation stages depends on the number of existing ventila-
tion stages.
The current room air pollution (ppm) is displayed on the central apartment
unit.
The stage selection setting must be set to Auto (see page 45).
Air quality control overrides the setting "Stage assignment to operating
modes" (see page 47).
Indoor air quality setpoints
Specify the desired indoor air quality (room air pollution 0..2000 ppm) for
operating modes Comfort and Economy.
The Comfort settings acts on ventilation operating modes Comfort and Pre-
comfort, the Economy setting on ventilation operating modes Economy and
Protection.
The permitted air pollution in Comfort mode cannot be greater than in
Economy mode.
Main menu > Ventilation > IAQ controller > Comfort setpoint:
Factory setting
1000 ppm
Setting
Main menu > Ventilation > IAQ controller > Economy setpoint:
Factory setting
1600 ppm
Setting
Humidity limitation
The central apartment unit measures relative humidity at the connected hu-
midity sensor and starts ventilation as needed.
The humidity limitation function is ended when the room air humidity is a
switching differential below the humidity limit value or when the set ventilation
running time has expired.
The current relative room humidity (% r.h.) is displayed on the central apart-
ment unit.
