4
5.6 Start-up procedure
• Start the fan.
• Check for abnormal noise.
• After 30 minutes of operation check
that the fans operate normally.
6. Maintenance
The jet fans must be kept in good and op-
erational condition.
Observe the following to ensure func-
tionality and working life.
6.1 Maintenance
6.1.1 CO-fans
Fans for CO-ventilation require a yearly
inspection and test of functionality. It is
recommended to implement procedures
in accordance with this requirement.
6.1.2 Smoke fans
Fans approved for high temperature and
smoke ventilation as well as for ventila-
tion on a daily basis, must be inspected
every six months.
Unused fans intended for smoke ventila-
tion must be inspected four times a year.
It is important that the motor mainte-
nance instructions are followed.
6.2 Precautions before mainte-
nance
Disconnect the fans from the electrical
system before inspection and ensure the
fans cannot be started inadvertently. See
section “5.4 Before service” for what pre-
cautions to make.
Fan units with external safety switches
must be disconnected at the switches
and secured – f.x. with locks. This can be
done in the fuse box or another centrally
placed switch.
Please note that fans controlled by auto-
mation may start suddenly, unless they
are disconnected.
6.3 Cleaning
Clean fans and silencers when needed by
means of pressurised air or vacuum
cleaning.
6.4 Vibrations
From the factory, the fans are balanced to
run without vibrations.
Vibrations occurring during operation
are normally an indication of accumula-
tion of dust and dirt or foreign bodies on
the rotor system. If ordinary cleaning
does not solve the problem, the fans
must stay off-line and expert assistance
should be called in. Prolonged operation
can damage motor bearings and rotors.
Important:
The fan is designed for
continuous operation. The
following kinds of
operation may cause
fatigue break in the
impeller and endanger
people.
- Operation with repeated
starting and stopping.
- Uneven flow velocity
through fan.
If in doubt, Novenco
should be contacted to
assess fan suitability.
Important:
Do not use high-pressure
water for cleaning the fans
or silencers.
Figure 9.
Dismounting and remounting of motor
09
10
08
07
04 05
11
12
10
09
08
07
06
05
04
10
07
06 13
04
05
15
11
14
10
16
07
06
13
04
05
15
11
14
02
03
03
03
03
02
02
01
01
01
01
Type ARO
and ARP
Type AUZ
Type AZT
Type AUO,
AUO
ARO
ARP
AUZ
AUT
ART
AZT
AZT
AUO
ARO
ARP
AUZ
Motor dismounting
AUT and ART
Unit dismounting
1.
Expansion bolts
AZT:
Fasteners
2.
Set screws
AZT:
Bolts and nuts
3. Silencers
4. Screws
5. Centre disc
6. Hub cap
7. Rotor
8. Set screws
9. Motor mounting flange
10. Motor
11. Guide vanes
12. Rivets
13. Centre bolt
14. Bolts
15. Washers
16. Stiffeners
