EN/07.2013/58/45
4.3. Humidification
The parameters involved are:
• S05 HUMIDITY SET POINT (DS): pre-set = 40%
• S08 BAND HU (BHU): pre-set = 50%
• M77 HUMIDIFICATION ENABLE: pre-set= NO
• M78 HUMIDIFICATION MODE: pre-set = 0 (Digital Humidifier)
• M79 HUMIDIFICATION START: pre-set = 20%
• M80 HUMIDIFICATION STOP: pre-set = 2%
The humidification is enabled if M77 = NO.
All parameters will be accessible if internal humidity probe is connected (see I/O Setup par. 3.4.6) and humidification is
enabled (M77= NO).
To humidify it’s possible to use a humidifier (digital exit) or use the external humidity with the freecooling damper. The
selection of device is done by the parameter M78, where:
– HUM. MODE = 0 : the digital humidifier is selected
– HUM. MODE = 1 : the analog humidifier is selected
– HUM. MODE = 2 : the free cooling damper is selected
Humidifying with humidifier
The humidifier start to humidify when humidity is: The humidifier stop to humidify when humidity is:
With DIG-OUT
H-ON = DS – 20% * BHU
H-ON = S05 - M78 * S08
H-OFF = DS – 2% * BHU
H-OFF = S05 - M80 * S08
Humidifying with freecooling
The parameters involved are:
• M81: pre-set = 2KJ/Kg
• M82: pre-set = 2°C
Comparing the external and internal humidity, the damper can be opened or not in order to let the humidity comes in.
This function is conditioned to a control on the internal temperature, internal and external humidity, comparing it on the
Psychometric diagram.
In the following table are shown the conditions to enable and disable humidification with freecooling.
Enable humidification with freecooling
(if all of this conditions are satisfied)
Disable humidification with freecooling
(if one on this conditions is satisfied)
– Damper not be under the conditions to be opened (par 5.4)
– External Enthalpy – Internal Enthalpy > M81
– (S01-M82) < TI < (S01+M82)
– The conditions to enable freecooling are satisfied.
– External Enthalpy – Internal Enthalpy < M81
– TI < [S01–(M82+1)] or TI > [S01+(M82+1)]
When the humidification with freecooling is enabled, the damper aperture will be proportional to the measured humidity.
At the following humid value the aperture damper is min: At the following humid value the aperture damper is max:
DAMP. MIN = DS – 2% * BHU
DAMP. MIN = S05 - M80 * S08
DAMP. MAX = DS – 20% * BHU
DAMP. MAX = S05 - M79 * S08
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