Novenco
®
jet fan types AUO/ARO - ARP/AUZ - AUT/ART - AZT
5
Switch off power supply for fans
1.
Locate the central fan power supply.
2.
Turn off the power for the fans.
3.
Disconnect the power supply.
4.
Lock the power switches .
Alternatively, lock access to the
power switches.
Service of the fans can now begin.
6.2 Checklist and intervals
Safe and proper function of the fans
require maintenance at regular intervals.
Faulty maintenance of fans covered by
warranty voids the warranty.
Maintenance of the fans must include the
following.
Maintenance checklist
•
Inspection of each complete unit
•
Repair and service of units
•
Test of functionality
It is recommended to implement
procedures in accordance with the above
requirements.
6.3 Cleaning
Clean fans and silencers when needed by
means of pressurised air or vacuum
cleaning.
Do not use high-pressure water
for cleaning the fans or
silencers.
6.4 Vibrations
In the production, the fans are balanced
to run without vibrations.
Vibrations that occur when the fans are
in operation are normally an indication
of accumulation 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.
6.5 Motors
The fan motors are key components, that
require regular service to ensure safety,
performance and warranty.
Service the fan motors in
accordance to the motor
manufacturer’s maintenance
instructions.
The motor bearings are greased-for-life
and must be replaced according to the
motor manufacturer’s instructions.
6.6 Motor removal
Before beginning work on motors,
follow the procedure in section
References to specific items below are to
figure 12 on page 10, unless noted
otherwise.
Dismounting motors
1.
Disconnect the supply cable from the
switch (figure 11, item 06).
2. AUO/ARO-ARP/AUZ-AUT/ART:
Support the fan, remove the nuts
from the four expansion bolts item 01
and take down the fan.
AZT:
Support the fan and remove the
fasteners item 01 and take down the
fan.
3. AUO/ARO:
Remove set screws item
02 and dismount silencers items 03.
Mark the silencers with tape so they
are not mixed up.
ARP/AUZ:
Remove set screws item
02 and dismount the silencers and
suspension brackets. Mark positions
of brackets and silencers with tape so
they are not mixed up.
AUT/ART:
Loosen and remove the
wire guards in both ends (figure 11,
item 11).
AZT:
Loosen the two pairs of nuts
and bolts, which hold the hose clamp
together. Remove clamp and outlet
cone. Also, remove the wire guard on
the inlet.
4.
Disconnect the cable from terminal
box to motor.
5. AUO-AUT/ART-AUZ-AZT:
Remove hub cap item 06 by
removing screws item 04, and centre
disc item 05. For AUZ and AZT, also
remove the centre bolt item 13.
ARO-ARP:
Remove the rivets in the
guide vane arrangement item 11 to
remove the arrangement.
6.
Dismount rotor item 07 by means of
a puller fastened in two threaded
holes of hub boss (M8 × 16 with
distance 50 mm).
7. AUO/ARO-ARP-AUT/ART:
Remove the four set screws item 08.
AUZ and AZT:
Remove the nuts and
bolts, items 14 and 15.
8.
Mark the motor position and
direction of rotation for later
remounting.
9.
Dismount motor, item 10.
AUO/ARO-ARP-AUT/ART:
Remove the motor mounting flange
item 09.
AZT:
Remove the four stiffeners
items 16 that hold the motor.
Service the motor according to the
manufacturer’s instructions. These are
included with the fan.
6.7 Mounting of motor
Assemble the fan after motor service.
Grease all bolts and screws
before mounting.
References to specific items below are to
figure 12, unless noted otherwise.
Mounting motor
1.
Mount motor, item 10.
AUO/ARO-ARP-AUT/ART:
Remount the motor with the set
screws, item 08.
AUZ and AZT:
Remount the motor
with bolts and washers, items 14 and
15. For AZT also mount the
stiffeners, items 16.
2. AUO/ARO-ARP-AUT/ART:
Check
that the mounting flange item 09 is
correctly located and that the motor
shaft is centred in the fan casing,
before tightening the set screws item
Figure 9.
Removal of plastic stick for
locking in Off position
Figure 10.
Removal of plastic stick for
locking in On position
Fan types
Intervals
CO-fans
Once a year
Smoke fans
Every six months
Smoke fans, unused
Every three months
Table 6.
Maintenance intervals
