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6.12
VAV : Potentiometer-type analogue input airflow control
In VAV mode, the airflow varies linearly, according to the voltage transmitted by the potentiometer, be
-
tween a min. airflow and a max. airflow to be set in the RMEC controller. Each voltage point transmitted by
the potentiometer corresponds to an airflow maintained constant irrespective of network pressure drops.
The potentiometer voltage range can be set.
Example with an REB ECOWATT
®
potentiometer
In the example, below, the user requires:
•
an extraction airflow of 360m
3
/h when the potentiometer sends a setting equal to or lower than 2V,
•
an extraction airflow of 1,080m
3
/h when the potentiometer sends a setting equal to or greater than
5.5V,
•
a linear extraction airflow between 360m3/h and 1,080m3/h between 2V and 5.5V
0
Maxi
measur
emen
t
selec
te
d
Mini
measur
emen
t
selec
te
d
Mini desired
airflow
Maxi desired
airflow
Voltage delivered
by the potentiometer (V)
Airflow (m
3
/h)
Overall voltage range
Selected
voltage
range
2
5.5
10
360
1080
1200
Variation rang
e
When your potentiometer is wired as defined in §"5.9 Electrical connection of a potentiometer (optional
accessory)", page 23, you must configure the RMEC controller following the instructions, below.
The required settings are as follows:
Selection of the type of sensor, in this case “potentiometer”
Selection of the desired potentiometer voltage range (min. voltage and max. voltage used in the appli-
cation case),
Selection of min. airflow and max. airflow
Settings possible at installer level only (§ "6.3 Access levels", page 25).
6.12.1
Select the type of sensor used
SYSTEM
CONFIGURATION
6 x
5 - SENSOR CONFIG
ANALOGUE INPUTS
6 x
P510 ANALOG. 1
SENSOR TYPE
ANALOG. INPUT 1
CO2
ANALOG. INPUT 1
POTENTIOMETER
Select POTENTIOMETER
