2
ZerAx
®
axial flow fan types AZL-AZN-AZW
Please note, that directives and
guidelines may dictate lifting in the
flange holes.
Novenco recommends lift of fans
with straps.
•
In flange holes
Lift in a minimum of three holes –
two in the outlet flange and one in
the inlet. On fans with inlet cones
mounted, remove the bolt in the
topmost position to use the hole as
the third point for lifting. Reinsert
and tighten the bolt once the fan is
in place.
Deformation of the flanges must be
avoided.
Eyebolts on motors are unsuited
for lifting the fans.
3. Storage
Correct storage conditions are important
for the function and durability of the
fans.
Damages due to incorrect
storage void the warranty.
4. Installation
4.1 Preparations
Complete the below checklist to ensure a
safe work environment and fan
functionality.
Checklist prior to installation
• Unpack the fan.
• Check that the rotor rotates freely in
the fan casing with equal blade tip
distances to the casing around the
circumference.
•
Outdoor installations:
Make sure
the installation location is
sheltered. Fans, motors and
frequency converters must be
protected from rain and water that
drips.
• Ground the fan before installation
to avoid static electricity. For
example, by assembly on non-
conducting vibration dampers and
foundations.
• Clear the fan installation location to
ensure free and unimpeded
airflows through the inlet and
outlet. Optimum airflow from all
sides removes risk of stall, gives
best performance and keeps sound
levels down.
• Secure the installation to at least
IP20, i.e. protect people and
surroundings from the fan and the
fan against foreign particles with
wire guards and filters before and
after the fan. Wire guards from e.g.
Novenco must be installed at least
120 mm before and after the fan.
See section “4.5 Connection to
duct” for minimum distances for
undisturbed airflow.
The vibration level of the
installation depends on how the
fans are installed, the
operational conditions and the natural
frequency of the foundation and
supports.
Follow the below guidelines to avoid
resonance.
• Soft suspension:
Fan is fixated
through springs or dampers.
The natural frequency [Hz] of
the system should be at least 20%
below fan speed.
Soft suspensions are available
from Novenco.
• Stiff suspension:
Fan is fastened
to a duct or a stiff wall through
holes in the flanges. The natural
frequency of this system should
be at least 20% above fan speed.
• Elastic structure:
Fan is fastened
to an elastic structure. The
natural system frequency
should be at least 20% higher or
lower than fan speed.
The owner is responsible for
compliance with the above
requirements. Non-compliance affects
the product warranty.
4.2 Installation
Installation of fans
1. Place and orient the fans in
accordance with the airflow direction
arrow on the fan casing.
Position fans with motors fitted
with drain holes with the holes
downwards at the lowest point.
2.
Recommendation:
Install the fans on
support frames.
3.
Optional:
As an alternative to
installation on support frames, fans
may be suspended in the casing
flanges or with special carriers.
4. Check that the fan rotors rotate freely
once the fans are in position.
5.
Fans on support frames and with
vibration dampers:
Remove the
transportation rods from the support
frames. The handles are marked with
a strong colour.
Figure 1.
Lift of fan with a strap
Conditions Specifications
Comments
Outdoor
One month
• Packing must be intact
Indoor or
sheltered
Max. six
months
• For unprotected fans
with no or broken
packing
• Ventilated location
• No condensation
Table 2.
Storage recommendations
Prolonged Max. two years
• Indoor
• Remove packing
• Ventilated location
• No condensation
• Turn rotor 20 times
every six months
• Add additional anti-
corrosive coating on
motor shaft
• Change motor ball
bearings after two
years of storage
Vibrations No
• Location must be
vibration free.
Tempera-
tures
5 to 40 °C
• Constant
temperature,
preferably 20 °C
• Ventilated
• No condensation
Humidity
Below 50%
• Avoid condensation
• Exceedance requires
airtight packing of
complete fan and use
of a moisture
absorbent agent such
as silica gel
Conditions Specifications
Comments
Table 2.
Storage recommendations
