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Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU,
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU, TASU, TATU, TATBU
Assembly
In order to fulfil the requirements for air-tightness class D, the dampers must be installed as per ‘Assembly
Instruction Lindab Safe’.
For certain manual dampers, there is the option of adding a motor later on.
The dampers allow 50 mm duct insulation without the knob being hidden. For 100 mm duct insulation, there
is an insulation cup, IK, for DRU, DSU, DTU, TASU and TATU.
PSDRU, TDRU and TDSU
The dampers are installed by inserting the two guide pins on the T-piece or saddle into the L-shaped slots on
the dampers. The dampers are then locked by turning them slightly clockwise.
Balancing
On DRU, PSDRU and TDRU the damper blade is stepless adjustable through 0–90° (0°=fully open, 90°=com-
pletely closed) using the knob in the cup. Locking is performed using screws for Pozidrive (PZD2) and the
damper angle can be read off a stamped grade on the edge of the cup. Other types of damper normally only
work in the fully open or completely closed positions.
On motorized shut-off dampers and dampers adapted for a motor, the shaft end for the motor is equipped
with a notch showing the position of the damper blade.
Manual dampers Ø <355 can be supplemented with a sturdy handle to facilitate adjustment. Larger dimen-
sions are equipped with a handle as standard.
Maintenance
Dampers and motors normally don't require any maintenance.
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. Declaration
of compliance with the essential requirements can be found at www.belimo.ch .
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