● The thermostat displays "---", if the received value is ≥5000 ppm.
● The thermostat displays "ER6", if sensor is broken.
The function shall improve the indoor air quality by increasing the volumetric air
flow.
IAQ control is only available when the thermostat is in Comfort mode. In other
operating modes, this function is disabled.
When P450 is set as 2 (T + IAQ) or 3 (T + r.h. + IAQ), IAQ control is enabled. This
function adjusts indoor air quality via damper when the measured IAQ - CO
2
is
higher than the setpoint (P023). The factory setting is 1000 ppm.
When the damper is open, the fresh air symbol is shown on the display.
Supported use cases with IAQ control:
● Use case a): IAQ - CO
2
control in fan coil systems with integrated fresh air
damper
The fresh air is provided via an external ventilation system, e.g. an air handling
unit (AHU)
YH Heating valve actuator
YC Cooling valve actuator
YHC Heating/cooling valve actuator
M1 1-speed or 3-speed fan, DC 0…10 V fan
B1 Return air temperature sensor or external room temperature
sensor (optional)
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