4
ZerAx
®
axial flow fan types AZL-AZN-AZW
and disassembly as well as maintenance.
Flexible connections can be placed as
close as ½D before the fan inlet.
AZN-AZW fans are for circular duct
connections with flanges on both inlet
and outlet sides. The AZL has an outlet
flange only.
Flanges are as standard for type AZL-
AZN according to Eurovent 1/2.
Flanges on the AZW are as standard type
DIN 24154 row 4.
Systems with high vibration levels or
more exacting performance
requirements must be provided with
expansion joints between fan and duct.
4.6 Electric connection
The installation and connection
to the supply network must be
done by authorised personnel
and be in accordance with current
legislation.
Connection of the supply voltage
depends on the motor type and if a
frequency converter is to control the
motor.
Connection of motor types
• Alternating current (AC) motors
- Connect the supply voltage
directly in the terminal box or
- connect the supply voltage to the
frequency converter and the
converter to the terminal box
• Permanent magnet (PM) motors
- Connect the supply voltage to the
frequency converter and the
converter to the terminal box
The PM motors require
connection through frequency
converters. Direct connection of
the supply voltage in the terminal
boxes on PM motors ruins the motors
and voids the warranty.
The terminal box is on the outside of the
fan casing. Connection diagrams are
inside the box lid.
The cable run must be in accordance
with current regulations, e.g. the EU
standard for electromagnetic
compatibility (EMC).
Frequency converters must be installed
in accordance to the manufacturer’s
installation documentation. Refer also to
the Novenco document “Configuration
of frequency converters for Novenco
fans”.
Shield and connect the fans electrically to
ground to eliminate interference and
protect the motor bearings and
windings.
Refer to the motor documentation for
methods to avoid impairment of the
supply voltage quality, among them
distances between supply and signal
cables. Methods may involve
installation of rectifiers, filters etc.
Connection references
• Connection diagram in terminal
box lid on fan
• Motor name plate
• Order specification
• Appendix “D. Wiring – motors up
to 16 A” on page 14
• Appendix “E. Wiring – motors over
16 A” on page 14
Only fans with steel inner hubs
may be run in reverse and this
for short periods at speeds up to
the max. allowable of normal direction.
The airflow is reduced to approx. 50%
of normal for the same system
resistance. The pressure is reduced to
25%.
Reversible operation increases the risk
of stall and shortens fan life.
Figure 8.
Optimum installation space
Figure 9.
Reduced installation space
Figure 10.
Installation in duct
Figure 11.
Duct installation with inlet cone
and wire guards
3 x D
>
3 x D
>
½D
r
>
D
>
D
>
D = Fan diameter
Built into duct
Free inlet
D
>
D
>
½D
r >
½D
>
D
>
Built into duct
Free inlet
D = Fan diameter
Fan size,
ØD, [mm]
RPM
1
2
Maximum
Optimal
Reduced
Hub
di
am
et
er
s
160
250
4919
—
—
280
4747
—
—
315
4570
—
—
355
4408
—
—
400
4269
—
—
450
4145
—
—
500
4086
—
—
Hu
b d
iam
et
er
s
35
0
500
3660
3660
3483
560
3460
3460
3286
630
3238
3238
3059
710
3000
3000
2804
800
2751
2751
2523
900
2498
2498
2217
1000
2270
2270
1918
1120
2029
1900
1568
1250
1809
1500
1201
H
ub
dia
m
et
er
s
560
1000
2034
2034
1904
1120
1893
1893
1727
1250
1751
1751
1552
1400
1599
1599
1371
1600
1419
1419
1166
1800
1262
1262
1002
2000
1130
1130
878
Table 3.
Max. allowable speed at 20 °C
1. Fan speeds depend on the installation
space.
2. Fans with Ø160 hubs can run at maxi-
mum RPMs irrespective of the installation
conditions.
