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Installation and Operating Instructions
EN
CHAPTER 3
ASSEMBLY
m
ATTENTION
RADAX
®
VAR . . – High pressure in-line fans
3 .0
Structural design
The VAR .. Ex axial high-performance fan is a direct drive fan where the motor is positioned in the airflow. The air flow
direction is pushing air across the motor. The axial flow pattern allows a low-loss, linear airflow and ensures a high
efficiency of the fan. The cylindrical casing with flanges on both ends and integrated guide vanes and motor support
are made from galvanised sheet steel.
The mixed-flow curved impeller is manufactured from hot-dip galvanised steel or electrically conductive material.
Dynamic balancing in accordance with ISO 1940 pt.1, class 6.3. Acoording to standard, ATEX certified motors, in
accordance with Directive 2014/34/EU (equipment safety law), with minimum protection to IP 55 can be used.
Assembly example: High pressure in-line fan VAR.. Ex with accessory components
Mounting feet MK
Bell mouth ASD
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).
VAR Ex
Anti vibration mounts SDD
for compression
4
Anti vibration mounts SDZ
for suspension
Guard SG
Counter flange FR
Explosion-proof flanged
Back draught
flexible connector STS
shutter RVS
Extention duct VR (optional)
– Required with motor protrution –
see point 3.4
Mounting feet MK
Fig .2
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