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ENGLISH
8 . 3
Variable flow operation (VAV)
Air quality sensor measures CO2 - Operation in VAV (Variable airflow)
For operation with variable airflow, it is necessary to install an air quality sensor (CO2 in general) either in
the return air duct or in the atmosphere of the subject room.
C o d e
D e s i g n a t i o n
D e s c r i p t i o n
132376
SC O 2 A A - 0 1 0 - 4 0 0 - 1 1 0 0
Ambiant sensor with display 400-1000 ppm, output signal 0-10 V
132262
SHU R - 0 1 0
SHUR 0-10 hygrometry sensor 0-100% HR wall mount
132375
SC O 2 A - 0 1 0 - 4 0 0 - 1 1 0 0
Ambiant sensor with display 400-1000 ppm, output signal 0-10V
132377
SC O 2 3 G M IX 4 0 0 - 1 1 0 0
Duct sensor of 400-1100 ppm, output signal 0-10 V or 4-20 mA
VAV
Recommended mode in a single zone configuration for variable flow applications
a c c o r d i n g t o a 0 - 1 0 V s i g n a l
The flow setpoint value is a function of a 0-10 V signal from an external sensor (CO2, tem
-
perature, hygrometry…) or a manual percentage.
Functional configuration of the ETD
Access to the simplified configuration menu (via password 1111) enables:
•
The selection of the operating range of the signal 0-10 V (see example below)
•
The range of flow variation of the blower fan
VAV
VAV
Vmax
Vmin
M
3
/h à Vmin
M
3
/h à Vmax
2.00 V
7.00 V
1000 m
3
/h
2000 m
3
/h
Parameter
Running mode
Smin, Smax =
using range from the connected sensor
M
3
/h at Vmin, M
3
/h à Vmax =
supply air flow range
(m
3
/h)
800
Signal (V)
CO
2
(ppm)
VAV
2000
8
7
6
5
4
2
0
0
400
1000 1400
2000
10
1400
1600
1200
1000
1800
Example of use:
Connection of a SCO2 sensor with a measurement range of 0-2000 ppm
(0-10 V)
To use the range 400-1400 ppm, you must select Vmin=2 V and Vmax=7 V.
If the example is used with flows that evolve from 1,000 to
2,000 m
3
/h, the facing curve is obtained.
No t e : The use of the HS Override entry allows the CO2 sensor to vary from the m
3
/h setpoint value at Vmax (here
2,000 m
3
/h regardless of the value measured by the sensor).
The selection of this mode in the installer menu automatically configures the user menu screen. The user
can thus change the operation mode of the unit without touching the settings.
Se t t i n g f o r u s e o n t h e ET D
Menu VAV
Off
Manual 10%
Auto
10%
1371 m3/h
Utilisation
VAV
Stop or Manual X % = Manual setting of a flow rate corresponding to: Min
Flow + X% [Max Flow - Min Flow]
Auto = use according to the clock or the status of the control terminal (on/
off + sensor)
Note: The control by the terminals 31-G0 / 33-G0 is a priority.
