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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
Bypass for cross-flow heat exchanger (based on
free cooling/heating only)
It is regulated based on free cooling and/or heating without considering
cooling and/or heating request
011
=1 (regulation on free cooling/heating)
012
=1 (cross-flow heat exchanger)
Select output for bypass of cross-flow heat exchanger (based on free
cooling/heating only)
025
=20 (DO1) or
026
=20 (DO2) or
027
=20 (DO3)
or
028
=20 (DO4) or
029
=20 (DO5)
(*) external damper not regulated can be used together with other type of damper defined by parameter
010
(
010
=1 or 2 or
3 or 4).
Regulation of on/off damper based on free cooling/heating
External on/off damper can be used as external regulated damper
010
=1, or as bypass damper for heat exchanger
010
=2, or
as bypass damper for cross-flow heat exchanger (based on free cooling/heating only)
010
=5.
Set type of regulation on damper
011
=1 (regulation based on free cooling/heating with cooling/heating request).
Define which output is the external regulated damper:
025
=11 (DO1) or
026
=11 (DO2) or
027
=11 (DO3) or
028
=11 (DO4) or
029
=11 (DO5). or the bypass for heat exchanger
025
=13 (DO1) or
026
=13 (DO2) or
027
=13 (DO3) or
028
=13 (DO4) or
029
=13
(DO5) or the bypass for cross-flow heat exchanger (based on free cooling/heating only)
025
=20 (DO1) or
026
=20 (DO2) or
027
=20 (DO3) or
028
=20 (DO4) or
029
=20 (DO5).
Activate free cooling and/or free heating setting parameter
170
.
The damper is regulated based on graphs depicted on paragraph
“21. Regulation with free cooling, free heating” page 53
when conditions of free cooling/heating are present and there is a cooling or heating request (this request is not considered if
a bypass damper for cross-flow heat exchanger, based only on free cooling/heating, is used).
Regulation of on/off damper based on air quality
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. A on/off damper can be used.
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 air quality, and the corresponding scale is set at
0..2000 ppm (
206
=0 and
207
=2000) with the unit of measurement ppm (
208
=0)
Select type of damper
010
=1 (external damper regulated).
Select type of regulation on damper
011
=0 (regulation on CO
2
).
Defines which output is the external damper regulated:
025
=11 (DO1) or
026
=11 (DO2) or
027
=11 (DO3) or
028
=11 (DO4)
Set.
Define the parameters for reduction of the CO
2
concentration (
167
: setpoint,
168
: proportional band).
The damper is regulated as following graph:
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
CO
2
167
168
165
0
Val_damper
164
Val_damper: theoretical value of the damper control
167
: air exchange setpoint
168
: air exchange proportional band
If the concentration value of CO
2
> (air exchange setpoint
167
) corresponding digital output is activated, icon
.is switched
on.
If the concentration value of CO
2
<= (air exchange setpoint
167
- proportional band
168
), corresponding digital output is deac-
tivated and 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 on/
off damper is deactivated.
