3
Slim centrifugal fan box – SlimVent SV..
Installation and Operating Instructions
2.10 Air flow direction and direction of rotation
The fans have a fixed direction of rotation, i.e. they are not reversible. The direction is indicated by arrows (direction of
rotation in red, air flow direction in blue). Incorrect direction of rotation leads to lower air volumes, increased noise levels
and a higher electrical current which can destroy the motor.
2.11 Speed control
The performance of all models can be adjusted (reduced) by voltage reduction through a transformer controller. The sui-
table controller can be found on the equivalent catalogue page(s). When speed controlled the maximum air flow tempe-
rature stated for speed controlled fans must not be exceeded.
The use of other brands, especially other electronic devices, can lead to malfunctioning and even destruction
of controller and/or fan. Controllers which have not been cleared by Helios are not liable for warranty and gua-
rantee claims.
2.12 Condensation – Water Development
In case of periodial use, moist and warm media and through temperature variations (intermittent service) condensate is
built up in the motor and is draining off must be ensured. Further measures like drain traps/drainage are highly recom-
mended. Under no circumstances must the motor be covered by moisture.
2.13 Motor protection
All fans have thermal contacts fitted which protect the motor against thermal overload. If the thermal contact trips this
is a sign that a possible fault has occurred. This must be investigated and any fault corrected.
If the motor switches off repeated via thermal contact, urgent investigations to find the cause should be carried
out by suitably qualified.
2.14 Putting into operation
The following checks are to be carried out:
- Check for operation according to the intended purpose of the fan.
- Compare power supply voltage with data on the rating plate.
- Check if fan is securely mounted.
- Check all parts especially screws, nuts and safety guards for tight fit.
- Check freewheeling of moving parts.
- Compare current consumption with data on the rating plate.
- Check earth connection.
- Check sealing of connection cable and clamping of the cable wires.
- Start operation only if protection against accidental contact is guaranteed.
2.15 Sound levels
The sound levels published in the catalogue can differ considerably after installation as sound pressure levels depend
on the absorption capacity on the room, the place of installation and other factors.
Sound reduction is possible by using attenuators and by speed controllers.
2.16 Maintenance
All servicing only in disconnected state !
Excessive deposits of dirt, dust, grease and other materials on impeller, motor and protection grille especially between
casing and impeller are to be avoided and have to be prevented by periodical cleaning. Also make sure that the con-
densation pores are unclogged. The motors have maintenance free, long-lasting greased ball bearings. After 2 years of
storage or standstill the motors are to be replaced.
If the fan is used for important functions, servicing is necessary at least every 6 months. In case of standstill for a longer
period it must be serviced before starting the operation.
ATTENTION
ATTENTION
WARNING
UK
