industrie technik evolution AHU-XXXSX1 series, User Manual

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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – info@industrietechnik.it – www.industrietechnik.it
16. Dehumidification
Dehumidification can be carried out in 3 modes:
- using the same battery that is normally used for cooling,
- using an on/off dehumidifier,
- using a modulating dehumidifier,
- using an external damper redulated on dehumidification
- using modulating fans regulated on dehumidification
Humidity can be controlled using the humidity sensor inside the controller (AHU-xxxxH1 models only) or using a remote
humidity transmitter with output 0..10 V connected to input AI3 (
023
=6).
• Use of the cooling battery for dehumidification:
In case the cooling battery is used, it received two theoretical signals:
- from the cooling controller
- from dehumidification.
The greater of these two signals is applied to the cooling battery.
The dehumidification signal is calculated based on the curve indicated below:
H
142
143
100
0
% dehum
CO
2
167
168
165
0
Val_damper
164
141
/ 2
H
100
0
142
% hum
141
/ 2
143
H
142
143
100
0
% dehum
141
/ 2
H
100
0
142
% hum
141
/ 2
143
WDS
WDS
WUS
WUS
H: value of the humidity detected by the internal or remote humidity sensor
WDS: dehumidification mode setpoint
% dehum.: theoretical value percentage of dehumidification
142
: humidity setpoint
141
: humidity neutral zone
143
: humidity proportional band
Settings for dehumidification with cooling battery:
- select the type of dehumidification with cooling battery
007
=0,
- define the type of cooling battery
003
=1 and
- a modulating output for the cooling battery
030
=4 (AO1) or
031
=4 (AO2) or
032
=4 (AO3)
- or a modulating output for a mixed-use battery
030
=5 (AO1) or
031
=45 (AO2) or
032
=5 (AO3),
- turn on dehumidification
- with an internal humidity sensor
139
=1 or
139
=3 only in cooling (AHU-xxxxH1 models only)
- or with a remote humidity sensor
139
=2 or
139
=4 only in cooling,
023
=6 (0..10 V humidity input) and put the JP1
jumper in the “3-2” position,
- humidity neutral zone
141
,
- humidity setpoint
142
,
- humidity proportional band
143
,
- humidity integral time
144
.
Control is carried out on the dehumidification operating setpoint WDS =
142
+ (
141
/2) and is proportional if
144
=0 or propor-
tional integral if
144
≠0.
If the dehumidification request has priority, the icon is displayed.
If the cooling request has priority, the icon is switched off.
In both cases, the icon is displayed.
Note: If the frost protection (with
188
=1), condensation alarm or steady ventilation are activated, dehumidification is shut down.