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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
Regulation of modulating damper based on free cooling/heating
The modulating damper can be used as an external damper or as bypass damper for heat exchanger
.
Select the type of modulating damper
010
=3 (modulating damper) or
010
=4 (modulating bypass damper for heat exchanger)
Select the minimum opening position (parameter
164
) and the maximum opening position (parameter
165
) of the damper.
Select the regulation type of damper
011
=1 (control based on the cooling/heating request with free cooling/heating conditions).
Define which analogue output is the modulating damper:
030
=9 (AO1) or
031
=9 (AO2) or
032
=9 (AO3).
Activate the free cooling and/or free heating by setting the parameter
170
.
The damper will be controlled based on the charts indicated in the paragraph
“21. Regulation with free cooling, free heating”
page 53
when the free cooling/heating conditions and cooling/heating requests are present.
Regulation of modulating damper based on CO
2
In rooms where a lot of people are present, it is necessary to regulate the air quality to ensure fresh air when the CO
2
concen-
tration exceeds a given threshold.
An external modulating damper is used with a PI-type control for this purpose.
In order to carry out this operation, set
023
=5 (AI3 input for 0..10 V CO
2
input) and position the JP1 jumper in the “3-2” position.
The input sensor AI3 is automatically configured as input 0..10 V for CO
2
, and the corresponding scale is set at
0..2000 ppm (
206
=0 and
207
=2000) with the unit of measurement ppm (
208
=0).
Select the type of modulating damper
010
=3 (modulating damper).
Select the minimum opening position (parameter
164
) and the maximum opening position (parameter
165
) of the damper.
Select the type of damper regulation
011
=0 (regulation based on CO
2
).
Define which analogue output is the modulating damper:
030
=9 (AO1) or
031
=9 (AO2) or
032
=9 (AO3).
Define the parameters of the PI controller for the reduction of the CO
2
concentration (
167
: setpoint,
168
: proportional band,
169
: integral time).
The modulating damper is regulated between minimum and maximum opening positions as indicated on the following figure:
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
Val_damper: theoretical value of the damper control
164
: minimum modulating damper opening
165
: maximum modulating damper opening
167
: air exchange setpoint
168
: air exchange 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 air change 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.
Regulation of modulating damper based on free cooling/heating and CO
2
The regulation corresponds to paragraph
“Regulation of modulating damper based on CO
2
” page 81
for CO
2
part and to
paragraph
“Regulation of modulating damper based on free cooling/heating” page 81
for free cooling/heating part.
The modulating damper is regulated considering the maximum theoretical value from the paragraphs indicated.
In order to carry out this operation, set
023
=5 (AI3 input for 0..10 V CO
2
input) and position the JP1 jumper in the “3-2” position.
The input sensor AI3 is automatically configured as input 0..10 V for CO
2
, and the corresponding scale is set at
0..2000 ppm (
206
=0 and
207
=2000) with the unit of measurement ppm (
208
=0).
Select the type of modulating damper
010
=3 (modulating damper).
Select the minimum opening position (parameter
164
) and the maximum opening position (parameter
165
) of the damper.
Select the type of damper regulation
011
=2 (regulation based on free cooling/heating and CO
2
).
Define which analogue output is the modulating damper:
030
=9 (AO1) or
031
=9 (AO2) or
032
=9 (AO3).
Define the parameters of the PI controller for the reduction of the CO
2
concentration (
167
: setpoint,
168
: proportional band,
169
: integral time).
