Structural Design; Assembly - Installation - Helios HRF 250 Ex Série Notice De Montage Et D'utilisation

Installation and Operating Instructions
EN
CHAPTER 3
ASSEMBLY
m
ATTENTION
HRF..  – Axial high-performance fans
3.0

Structural design

The HRF .. Ex axial high-performance fan is a direct drive fan where the motor is positined in the airflow. The air flow
direction is pushing air over the motor. The cylindrical casing with flanges on both ends and motor support is made
of galvanised sheet steel. An additional explosion-proof terminal box is fitted externally on the casing.
The types have a high-performance impeller with profiled blades made of polymer. Dynamic balancing in accordance
with ISO 1940 pt.1, class 6.3.
According to standard, ATEX certified motors, in accordance with Directive 2014/34/EU (equipment safety law) are
used.
Installation examble: High-performance fan HRF.. Ex with accessory parts
Mounting feet MK
Bell mouth ASD-SGD
Guard SGD
3.1 Assembly – Installation
All safety regulations must be observed during assembly and installation!
The fan is delivered in standard execution as a complete unit, i.e. ready for installation. The execution is for a horizontal
installation. If there is a risk of condensate formation a vertical installation position (discharge downwards) is excluded!
Before delivery, every fan is tested at the factory. After unpacking and before installation the following
points should be checked:
– damages from transport,
– unhindered running of impeller,
– uniform distance from blade tip to casing (air gap; minimum air gap see page 5, table 3.2))
When installing heed to obviate body sound transmission through the use of anti vibration mounts. For this, e.g. by
using flexible connectors (explosion-proof flanged flexible connector, accessory)) when installing in ducts.
– When installing in ducts make sure that there is a sufficiently long, straight piece of duct (2 x duct diameter) in front
and behind the fan as otherwise considerable performance reduction and noise increase will result.
– The casing must not be deformed or distorted during installation (checking of minimum air gap, see 3.2).
HRF.. Ex
4
Anti vibration mounts SDZ
for suspension
Guard SG
Counterflange FR
Explosion-proof flanged
Back draught
flexible connector STS Ex
shutter RVS
Extension duct VR (optional)
– required for motor protrusion –
see point 3.4
Mounting feet MK
Anti vibration mounts SDD
for compression
Fig.2