Helios Explosion-proof Series, Installation And Operating Instructions Manual

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– Axial high-performance fans
Installation and Operating Instructions
– 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 may not be used outdoors and may not come in contact with water during operation!
The fan must only be used for its intended purpose and within specification limits!
– The transportation of solids or solid particles in the medium as well as fluids is not permitted.
– 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.
– The fan must not be connected to a smoke gas duct.
– Rust particles may not occur in the air flow.
– The temperature class on the type plate must correspond to the ignition temperature of the gas may occur or the
fan must meet a higher temperature class.
– The fan may be operated only 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 24163; they are valid for the rated speed and
standard execution at free inflow and discharge. Diverging execution 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. This causes a reduced output of about 10 %.
1.10 Sound level
The sound level* also refers to the above mentioned configuration. 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 factors.
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 catagory may be used. Further information see rele-
vant 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 relevant
wiring diagram!
– 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.
– Speed control and abnormally frequent on/off switching is not permitted.
– Every motor must have a motor protection device of category II (2) G, see Directive 2014/34/EU ( Equipment
Safety Act), which is to be adjusted to the rated current of the motor and which trips within the given time tE on the motor
type plate privided the motor is blocked. The function is to be tested on the basis of the tripping characteristic line
enclosed with the protection switch.
Also observe the regulations especially enclosed with the device.
– 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. Depending on the installation conditions a protection against
accidental contact may be required on the discharge side.
– 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 circumference is to be secured by regular control!
– 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
aluminium or steel surfaces. According to DIN EN 14986 no paint containing aluminum may be used (risk of a
thermite reaction).
– 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 (TRBS 2153) must be implemented.
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* (Performanvce & sound data from the
currently valid Helios publications and the
Internet )