Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU, DTBVU, 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 insu-
lation 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 dam-
pers. 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°=completely
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 comple-
tely 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 dimensions 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 compli-
ance with the essential requirements can be found at www.belimo.ch .
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