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2.7.7. Constant pressure option
In constant pressure option, the unit is going to maintain a constant pressure in the network (at beginning of network - unit outlet air supply side
and at end of network - unit inlet extraction side). To achieve this, the unit must measure the differential static pressure between the network airflow
and the ambient air in each flow. These two pressure sensors are located in the electrical box. On each sensor, one of the two pressure taps is free
(measurement of the static atmospheric pressure) and the other is connected to a transparent capillary tube, on stand-by in the side rail air supply side.
These two capillary tubes are equipped with pressure taps and identified by a "pression insufflation/supply pressure" label to measure the air supply
pressure and "pression extraction/extract pressure" to measure the extraction pressure.
Please the pressure tap of the hose marked "supply pressure" on the air supply duct.
Pression Insufflation /
Supply Pressure
Please the pressure tap of the hose marked "extract pressure" on the extraction duct.
Pression Extraction /
Extract Pressure
Air supply pressure tap position
Extraction pressure tap position
Caution:
to obtain more accurate measurements, the pressure must be measured where there is the least risk of turbulence, i.e. on a straight
section of the duct. The minimum distance to be respected from any disturbance is at least twice the diagonal of a rectangular section and at least
twice the diameter of a circular section.
