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Installation and Operating Instructions
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ATTENTION
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CAUTION
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ATTENTION
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ATTENTION
Special execution
RADAX
®
VAR . . – High pressure in-line fans
2 .1
Qualification of personnel
The electrical connections of the fan may only be performed by qualified electricians.
Installation-, start-up-, maintenance work may only be carried out by explosion-proof authorised specialists..
2 .2
Additional safety installations
All 1-phase explosion-proof motors are equipped with thermal contacts wired in series with the coil which automatically
turn off and restart after cooling.
2 .3
Protection against accidental contact
When installing observe the valid regulations for labour protection and accident prevention! The operator is
responsible for compliance!
– Any contact with rotating parts must be avoided. Make sure that no persones, textiles or other materials which
could be sucked in, as for instance clothing of persons are close to the suction area of the fan.
– Certain fan types are delivered serially with a protection grille on the inlet side. Depending on the installation con-
ditions a contact safety device on the discharge side may be necessary. Corresponding grilles are available as
accessories.
– Fans protected by their installation in ventilation ducts or closed aggregates do not need a protection grille, if the
installation guarantees the same protection. We emphasize that the operator will be held responsible for accidents
occuring as a result of missing protection devices.
2 .4
Air flow direction and direction of rotation
The airflow direction is pushing air across the motor (see air-
flow direction- and direction of rotation arrows). The correct
direction of rotation - as viewed from the front of the impeller
- counterclockwise, besides, wear protective glasses (Fig.1).
AC types are to be connected by interchanging two phases
for counterclockwise rotation in the clockwise rotating field.
Wrong direction of rotation can cause overheating of the
motor!
2 .5
Speed control
Explosion-proof fans of VAR series are not speed controllable and may not be operated by means of frequency
inverter!
Motors in execution increased safety „e" are generally excluded from operation with frequency inverters.
NOTE: AC motors (special version on request) in flameproof enclosure „d" may be operated by means of frequency inverters.
It is necessary to install filters to protect the motor. This needs to be clarified in each case, object-related!
3
EN
Fig .1
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