Performance Data; 1.10 Sound Levels; Safety Information For Explosion-Proof Fans - Helios RDD 200-Ex Série Notice De Montage Et D'utilisation

Installation and Operating Instructions
EN
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ATTENTION
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ATTENTION
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* (Performance & sound data from the
currently valid Helios publications and the
internet)
CHAPTER 2
SAFETY INFORMATION
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WARNING
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ATTENTION
RD..  and VD..  – Roof fans
– The roof fans RD/VD.. EX are designed as components of a stationary ventilation system. They may only be ope-
rated when installed as intended and the safety by protective installations and the construction according to DIN EN
14986 required explosion protection measures are guaranteed.
– According to DIN EN 14986 fans are not to be regarded as absolutely gas tight. The same explosion-proof zone is
valid for inside and outside!
– The fan must only be used for its intended purpose!
– The transportation of solids or solid particles in the medium as well as fluids is not permitted.
– Air flow media which attack the materials of the fan are not permitted.
– The fan is not suitable for handling dusty media. Deposits of dust in the fan casing and/or impellers are not
permitted. If there is a risk of dust deposits, an air purifier must be provided.
– The fan must not be connected to a smoke gas duct.
– The air flow must not contain any solid or liquid substances, which could settle on the motor or impeller and
thus create an ignitable surface! If necessary, a suitable filter must be used (e.g. synthetic fibre min. G4)
and any chips must be vacuumed.
– The suction-side intake of rust particles (iron oxide) must be prevented. In this respect, the fan must be
checked for any rust film that could settle on the motor or impeller and thus create an ignitable surface by
regular inspection. A six-monthly inspection is required to remove any adhesions.
– The temperature class on the type plate must correspond to the ignition temperature of the gas that may be present
or the fan must meet a higher temperature class.
– The fan may only be operated within the specified performance curve range so that a sufficient cooling is
ensured. The use beyond the range of the performance curve is not permitted!
1.9

Performance data

The motor type plate informs about the electrical data, these must be coordinated with the local supply network. The
fan performances* were determined on a test stand according to DIN EN ISO 5801:2010-12; they are valid for the
rated speed and standard execution using a bell mouth without safety guard with unhindered inflow and outflow.
Diverging executions and adverse installation and operation conditions can lead to a reduction of performance. For
explosion-proof fans minimum air gaps between casing and impeller are required.

1.10 Sound levels

The sound level* also refers to the configuration in chapter 3.1. Casing vibrations, unfavourable operating conditions
etc. can lead to an increase of the given data published in the catalogue. Data relating to certain distances (1, 2, 4 m)
are valid for freefield conditions. 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 fac tors.
2.0

Safety information for explosion-proof fans

Use, connection and operation for explosion-proof fans underlie special regulations; in case of doubt further inquiry is
necessary. Helios explosion-proof fans are in accordance with the specification ATEX, Directive 2014/34/EU (
Equipment Safety Act). For the evaluation of the explosive area an allocation into zones is necessary by the operator.
Only fans with adequate, for the respective zone certified product category may be used. Further information see
relevant standards and wordings of law.
– Before any maintenance or installation work or before opening the terminal compartment, the device is to
be fully isolated from the power supply and secured against unintended restart! The electrical connection
must be carried out only by a qualified electrician in accordance with the following wiring diagrams!
– Compliance with the EMC Directive refers only to this fan when it is directly connected to the public grid. If the fan
is integrated into a system or supplemented with other components and operated, the manufacturer or operator is
responsible for compliance with the EMC Directive.
– Abnormally frequent on/off switching is not permitted.
– Every motor must have an approved PTC-resistor trip device of category II (2)G, see EU Directive 2014/34/
EU ( Equipment Safety Act), with a reset lock so that there is no automatic resetting after a loss of con-
trol voltage and voltage restoration. Please observe the special regulations accompanying these units.
– Intake or entering of foreign objects in the fan has to be avoided by using protection devices (EN 60529) to IP 20
resp. with a mesh width of not more than 12 mm. It would also cause electrical discharge and / or sparks.
– The compliance of the head gap (the gap between blade tip and casing) represents for explosion protection
an extremely important feature. This can e.g. be affected by external influences on the casing. Therefore,
the casing may not be deformed during the assembly. Maintaining the required gap, at any point of the cir-
cumference is to be secured by regular control!
– To conform the operational safety, a vibration control is to be carried out in regular intervals! Alternatively, it is advis
able to install a vibration monitoring in Ex-version on site. This must take the system out of service when exceeding
the limits. The permissible vibration limits according to ISO 14694 are shown in chapter 3.3.
– The planners and operators must ensure easy access for inspection and cleaning work!
– The operator is responsible for compliance with all installation-related safety.
– A uniform inflow and a free discharge must be ensured.
– Upstream and downstream components or those that are directly in the air stream must not have unprotected alu-
minium or steel surfaces. According to DIN EN 14986 no paint containing iron oxide may be used due to the risk
of thermite reaction (EN 1127-1).
– If hazards are identified by lightning, the systems must be protected by suitable lightning protection measures.
– Equipment must stand in a sufficient safe distance to transmitters or be protected by suitable shielding.
– The regulations to avoid danger of ignition due to electrostatic discharges (TRGS 727) must be implemented.
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