82/160
AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
Activate the free cooling and/or free heating by setting the parameter
170
.
Set parameters from
171
to
178
.
Regulation of modulating damper based on dehumidification
It can be used in rooms with humidity that is ALWAYS higher than external humidity (overcrowded places, health farms, sauna,
swimming pools, ...) or in winter when external humidity is ALWAYS lower than internal humidity. An external modulating
damper is used with a PI regulation for such a situation.
To use this function set following parameters:
set parameter
139
to activate dehumidification,
-
139
=1 or
139
=3 (in cooling only) with built-in humidity sensor -> models AH-xxxSH1
-
139
=2 or
139
=4 (in cooling only) with a remote 0..10V humidity transmitter, set
023
=6 and position jumper JP1 on position “2-
3“, then input sensor AI3 is set for 0..10V input transmitter, the corresponding range is set to 0..100 %r.H. (
206
=0 and
207
=100)
with unit set to %r,H. (
208
=1)).
select the type of regulated damper
010
=3 (modulating damper),
select the type of regulation applied to damper
011
=3 (dehumidification),
select the minimum opening position (parameter
164
) and the maximum opening position (parameter
165
) of the damper,
select the type of damper control
011
=3 (control based on dehumidication),
define which analogue output is the modulating damper:
030
=9 (AO1) or
031
=9 (AO2) or
032
=9 (AO3),
define PI regulation parameters for dehumidification (
141
: neutral zone humidity,
142
: humidity setpoint,
143
: proportional
band humidity,
144
: integral time humidity)
The modulating damper is regulated between minimum and maximum opening positions as indicated on the following figure:
H
WDS
143
VEL3
0
Ventilatore
modulante
VEL1
142
AOx
141
/2
H
WDS
143
165
0
Val_damper
164
142
AOx
141
/2
(Fig1)
(Fig2)
H
WDS
143
VEL3
0
Modulating
fan
VEL1
142
AOx
141
/2
(Fig1 inglese)
Val_damper: theoretical value of the damper control
WDS: working dehumidification setpoint
164
: minimum modulating damper opening
165
: maximum modulating damper opening
142
: humidity setpoint
141
: humidity neutral zonet
143
: humidity proportional band
The percentage output of the PI controller is applied between the minimum and maximum opening positions of the damper
164
and
165
.
If the dehumidification request corresponds to a value greater than the minimum damper position, the
icon is displayed. If
the request corresponds to the minimum position, the
icon is switched off.
Note: If the frost protection alarm is activated (and
188
=1) or if the appliance is switched off or if ventilation is absent,, the
modulating damper is completely closed.
