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6.5
VAV variable airflow mode
6.5.1 Description
In variable speed operation, the controller pilots the speed of the roof fan linearly. The controller will vary
the speed of the roof fan between 200 rpm (min. speed), and its maximum speed in proportion to the signal
sent by the external sensor. If the display is present on the roof fan, it will show you the airflow in m
3
/h.
The speed adjustment can be done in different ways:
• By the potentiometer integrated in the controller,
• By an external potentiometer with ON/OFF like CVF,
• By an external 0-10V output,
• By a SMTD switch (Min. speed/Speed 1/Speed 2/High speed with speeds 1 and 2 adjustable),
•
Airflow driven by Modbus BMS.
Example of VAV slaving according to external temperature measurement:
VAV slaved according to measurement of the outside
temperature
VAV curve
M
Ventilateur Extraction
TED F400 ECOWATT®
T°
Sensor signal
Airflow
(m
3
/h)
Q mini
Q maxi
360
1080
0
20%
60%
6.5.2 Control wiring
For Analog/Digital controls use cable with the following characteristics:
• Sheath Ø: 6mm to 12mm
• Strand cross-section: 0.7mm² to 1mm².
• Recommended minimum stripping: 10mm
• Maximum recommended length: 30m
For Modbus control use cable with the following characteristics:
• Sheath Ø: 6mm to 12mm
• Strand cross-section: 0.7mm² to 1mm².
• Recommended minimum stripping: 10mm
For more information on Modbus communication see § "6.2 Modbus connection - Connection to a BMS",
page 45.