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6.4.3.2 Air humidification
The controller manages signals that are used to control an external humidifier, which is either ON/OFF or
modulating type.
When the ON/OFF digital output is used for management, the OK signal to the humidifier is output when the
ambient relative humidity (URa) is smaller than the setpoint value (SpUR) minus the neutral zone (ZNUR), if
any, and the corresponding differential (DUR). The humidifier is disabled as soon as the ambient relative
humidity reaches the setpoint value minus the neutral zone, if any.
When the analogue output is used for management, the humidifier receives the ok signal when the relative
humidity value measured in the room is lower than the setpoint (SpUR) minus the value of the neutral area
(ZNUR), if any. The humidifier command signal increases proportionally within the differential (DUR). The
humidifier is disabled as soon as the ambient relative humidity reaches the setpoint value minus the neutral
zone, if any.
6.4.4 Ambient air quality control
If the unit is supplied with an external air damper, the controller is designed to control the air change in the
room, keeping the external air damper at a min. fixed opening.
If the unit features an air quality probe, the controller can manage the min. air change as well as a greater air
change based on the value of the air quality measured.
This is a key function in rooms where people's traffic changes during the day (e.g. shopping malls, movie
theatres).