3
RD.. and VD.. – Roof Fans
Installation and Operating Instructions
–
Fans which are protected by their installation method (e.g. installation in ventilation ducts or closed assemblies) do
not require protection guards if the plant provides the necessary level of safety. Please note that the operator is
responsible for complying with the current standard (DIN EN 13857) and can be held liable for accidents as a con-
sequence of missing protection systems.
1.6
Personnel qualification
–
All electrical work as well as the start-up must only be carried out by qualified electricians.
–
Installation, servicing and maintenance may be carried out by specialists (e.g.: industrial mechanics, mechatronics
engineers, metal workers or persons with comparable training) with the exception of electrical work.
1.7
Air-flow direction and direction of rotation
WARNING
Parts ejected from the fan may damage your eyes!
Wear protective glass when checking the direction of rotation!
WARNING
The rotating impeller can sever or trap your fingers/arms!
Operation only with mounted safety fittings!
Do not insert objects into the rotating impeller! Risk of damage!
The roof fans have a fixed direction of rotation and air-flow direction (they are not reversible), which is indicated by the
arrows on the device. The incorrect direction of rotation can lead to the overheating and destruction of the fan!
The direction of rotation may only be checked when the fan is switched off and coasting!
1.8
Speed control*
– 1-phase types
All roof fans of type..W can be voltage-controlled by means of transformer or phase control. When dimensioning the
control unit, the maximum current for speed control according to the type plate must be observed.
– 3-phase types
All fans of type..D can be speed-controlled in one of the following ways.
a) Transformer/phase control: All fans (except for VDD/RDD 560/4) can be voltage-controlled by means of transformer
or phase control.
b) Frequency converter: All fans can be speed-controlled with a frequency converter with sine filter. The use of a fre-
quency converter without sine filter is only possible with approval from Helios.
The use of third party products, especially other electronic devices, can lead to functional problems, the
destruction of the controller and/or fan. If control units are used, which have not been approved by Helios, all
warranty and liability claims shall lapse.
1.9
Motor protection device*
– 1-phase motors
a) All 1-phase motors in fans Ø 180 to Ø 250 have thermal contacts, which are wired in series with the coil and switch
off automatically and restart after cooling.
b)
All
1-phase
motors
in
fans
over
Ø
315
have
thermal
contacts
wired
on
terminals
and
they can be monitored and secured against being switched on again by using a motor protection device
MW
.
– 3-phase motors
a) All 3-phase motors in fans Ø 315 to Ø 630 have thermal contacts wired on terminals. The specifically developed mo-
tor protection device
MD
is recommended for connection.
b) All 3-phase motors in fans Ø 710 have thermal contacts wired on terminals. The specifically developed motor pro-
tection device
MSA
is recommended for connection.
1.10 Functional safety – Emergency operation
When using the roof fan in an important supply function, the plant is to be designed so that emergency operation is
automatically guaranteed in case of fan failure. Suitable solutions are, for example,: parallel operation of two less po-
werful units with a separate electric circuit, standby fan, alarm systems and emergency ventilation systems.
2.0
Warranty claims – Exclusion of liability
All versions of this documentation must be observed, otherwise the warranty shall cease to apply. The same applies
to liability claims against Helios. The use of accessory parts, which are not recommended or offered by Helios, is not
permitted. Any possible damages are not covered by the warranty. Changes and modifications to the unit are not per-
mitted and lead to a loss of conformity, and any warranty and liability shall be excluded in this case.
2.1
Certificates - Guidelines
If the product is installed correctly and used to its intended purpose, it conforms to all applicable provisions and EU
guidelines at its date of manufacture.
UK
WARNING
WARNING
ATTENTION
l
CHAPTER 2
GENERAL INFORMATION
ATTENTION
ATTENTION
* The associated control units can be found
in the currently applicable Helios sales docu-
ments.
* The associated motor protection devices
can be found in the currently applicable
Helios sales documents.
