9
Constant/variable flow dampers
DAU, DA2EU, DAVU
Assembly
In order to fulfil the requirements for air-tightness class D, the devices must be installed as per ‘Assembly
Instruction Lindab Safe’.
The devices must be installed with the air flow in the direction of the arrow.
The devices allow 50 mm duct insulation without the scale or any motor being hidden.
Pressure range
50–1000 Pa over the unit.
Interference sensitivity
In order to achieve stated precision for the set flow, a straight duct of at least 3×d before and 1.5×d after
the devices is required. A assembly close to a source of interference (bend, saddle, etc.) reduces control
accuracy and the flow can deviate from the set value.
Changes in direction
The units are independent of their direction of installation; you can deviate from the projected direction
and install them in any direction you like without affecting accuracy.
Systematic error
Control accuracy
The devices are calibrated within their entire operating range at the factory. This means the devices keep
the flow constant to within approx. ±5 to ±10 % of the set flow. Larger deviations occur at lower flows,
especially with small sizes.
Maintenance
The devices normally don't require any maintenance, but should be protected from contaminated air
wherever possible.
CE marking
Our dampers with electrical actuator are regarded as a component in the duct system and does not need
to be CE marked separately.
Their electrical actuators on the other hand are part of the electrical system and are CE marked. Declara-
tion of compliance with the essential requirements can be found at www.belimo.ch .
Balancing
DAU
The flow is adjusted by loosening the central nut and using the knob to turn the scale arrow so that it
points to the desired flow on the scale. The nut is then locked.
Scale arrow
Center nut
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