SystemAir VAV EC Originalbetriebsanleitung Seite 42

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5.10.2 functionality constant air volume (CAV)
Shall the air volume (factory setting) be kept constant, the differential pressure in front of the inlet cone and in the
inlet cone has to be kept constant.
figure 5: measuring points
5.10.2 functionality constant pressure - variable air controll (VAV)
Shall the pressure be kept constant in the duct system, the differential pressure between atmosphere and duct
system has to be kept constant. For this operation mode, the position of the measuring tubes have to be changed
with the „constant- pressure kit" (article no.: 75625). The manual to change from CAV to VAV is included in the cons-
tant pressure kit.
5.10.2 Volumenstrombestimmung für Einstromdüsen mit Druckentnahme
The air volume can be calculated from the differential pressure. (differential pressure between measuring point in the
inlet cone and in front of the inlet cone). See the following equation.
Shall the air volume (factory setting) be constant, the differential pressure has to be kept constant.
ring measure circuit -
Ringmessleitung-
measuring point in the inlet cone
Messpunkt in der Einströmdüse
Messpunkt vor der Einströmdüse measuring point
infront of the inlet cone
V ̇ = k √ ∆��
Volumenstromberechnung:
(V̇ in [m³/h] und ∆�� in [Pa])
.
V ̇ = k √ ∆��
Volumenstromberechnung:
(V̇ in [m³/h] und ∆�� in [Pa])
∆�� = V ̇ ² :k²
Düsendruck:
(V̇ in [m³/h] und ∆�� in [Pa])
∆�� = V ̇ ² :k²
Düsendruck:
(V̇ in [m³/h] und ∆�� in [Pa])
/
K berücksichtigt die spezifischen Düseneigenschaften
K berücksichtigt die spezifischen Düseneigenschaften