background image

6

NovAx™

  axial flow fan types ACN-ACW ATEX and ACW EX

amount and interval.

6.7 Dismount of motor

Switch off the power and 
disconnect the motor cable in 
the terminal box, before 

beginning work on the rotor and motor.

The below procedure is with reference to 
figure 10 on page 10.

Dismount of motor

1. Dismount any ducts on the inlet and 

outlet sides.

2. Remove the centre screw (item 1) and 

disc (item 2) that hold the hub cover         
and rotor.

3. Remove the hub cover (item 3).
4. Dismount the rotor (item 4) by means 

of a puller fastened in the two 
threaded holes of the hub boss (item 
5).

5. Disconnect the motor cable from the 

motor.

6. Support the motor. See table 7 on 

page 9 for max. motor weights.

7. Detach the motor from the motor shell 

(item 8) by removal of the bolts (item 
6) and washers (item 7).

8. Remove the motor (item 11) and 

motor flange (item 10).

Do not expose fans and motor 
parts to shocks that can result in 
imbalance and deformations. 

Motor bearings and fan components 
are vulnerable parts.

6.8 Mount of motor

Replace lock washers and nuts 
during assembly.

The below procedure is with reference to 
figure 10 on page 10.

Mount of motor

1. Mount the motor (item 11) and make 

sure the motor shaft is centred in the 
fan casing.

2. Insert the bolts and washers (items 6 

and 7). Tighten the bolts.

3. Mount the rotor (item 4) on the motor 

with a tool fastened in the threaded 
hole of the motor shaft. The rotor hub 
must rest against the motor shaft 
collar.

4. Use a feeler gauge to check that the 

clearance between the rotor blade tips 
and fan casing is the same throughout 
the circumference and meets the 
below requirements.

• Minimum 2 mm
• 10% of the motor shaft diameter
• Maximum 13 mm

Refer to the motor manufacturer’s 
documentation for the shaft diameter.

5. Adjust the motor position with 

reference to step 4.

6. Mount the hub cover (item 3), centre 

disc (item 2) and centre screw (item 1).

7. Connect the motor cable (item 13) to 

the motor (item 11) and the external 
power cable in the terminal box (item 
12).

8. Reconnect any ducts.

Follow the procedure in section “5. Start 
of operation” to start the fan.

6.9 Blade angle adjustment

The rotor blade angles are set in the 
factory to deliver the required 
performance.
If the fan performance needs to be 
changed, it is possible to change the 
angles. This requires knowledge of the 
motor load and of the max. permissible 
blade angle with relation to the motor 
rating. If the blade angles are changed, 
the rotor has to be re-balanced.
Consult Novenco, before changing the 
blade angles. A blade angle tool for angle 
adjustment along with instructions for 
use is available from Novenco.

7. Troubleshooting

Check for the below faults in case of 
breakdowns or lack in performance. Call 
for service, if problems persist.

Lack in performance

• Inlets  blocked
• Outlets blocked
• Dampers blocked
• Supply air reduced
• Motors defective
• Motors disconnected
• Wrong fan rotation direction

Noises and vibrations

• Motor bearings defective
• Rotors out of balance
• Rotors damaged or worn
• Bolts or components loose
• Wrong pitch angles of rotor blades 

Fans that operate in the stall area are 
more likely to suffer breakdowns.

8. Inspection and test

It is recommended to test and inspect the 
fans at regular intervals with regard to 
operability and operation conditions.
Inspect the fans twice a year to ensure 
satisfactory function and long life.

Extent of inspection

• Measure power consumption
• Verify torques of fixation bolts
• Cleaning

- inside with pressurised air
- outside with a lint-free cloth with 

a mild soapy water solution

• Visual inspection

- Rotors
- Fan casings
- Electric connections

Enter all values and observations in a 
log.

9. Sound

The sound emissions depend on the 
installation and operation conditions, 
hence no general data can be given.

Refer to the fan specifications from the 
AirBox calculation program for specific 
emissions and to the product catalogue 
for more general data.

10. Safety

The installation must be in accordance to 
Novenco’s, the current and the local 
safety regulations. At a minimum these 
include EN 13850.

Use only a manual 
grease gun for 
lubrication.

Excess grease causes bearings 
to overheat and results in 
failure.

Sizes

Torque [Nm]

Motor bolts (6)

Centre screw (1)

M6

9.4

6

M8

23

12

M10

45

20

M12

78

20

M16

190

25

M20

370

25

Table 4.

Motor fixation torques

Summary of Contents for NOVENCO NOVAX ACN ATEX Series

Page 1: ...Pure competence in air ENGLISH 927264 0 NOVAX FAN TYPES ACN ACW ATEX AND ACW EX INSTALLATION AND MAINTENANCE...

Page 2: ...n result in imbalance and deformations Motor bearings and fan components are vulnerable parts 2 1 Markings The ACN ACW ATEX and ACW EX have nameplates on the fans and motors Fan nameplate information...

Page 3: ...functionality Checklist prior to installation Unpack the fan Checkthattherotorrotatesfreelyin the fan casing with equal blade tip distances to the casing around the circumference For outdoor installa...

Page 4: ...tical support frame for an ACN ACW ATEX or ACW EX fan consists of a plate onto which the fan is mounted in the flange Dampers are optional To prevent spread of vibrations to the surroundings it is rec...

Page 5: ...fan for directional change of rotation It is recommended to install a time delay for this purpose Check that the rotational direction of the rotor complies with the arrow on the outside of the fan cas...

Page 6: ...mits usually require cleaning or balancing of the rotors Alternatively the causes must be investigated and removed Refer to ISO 14694 For variable speed fans the vibration level limits are likely to b...

Page 7: ...tion to start the fan 6 9 Blade angle adjustment The rotor blade angles are set in the factory to deliver the required performance If the fan performance needs to be changed it is possible to change t...

Page 8: ...nded warranty can be agreed upon 15 Spare parts Contact Novenco for information about and ordering of spare parts 16 Classifications Flange standards Eurovent 1 2 for ACN ATEX DIN 24154 R4 for ACW ATE...

Page 9: ...ans Applied standards and regulations ANSI AMCA 300 14 DS EN 1037 A1 2008 DS EN ISO 1461 2009 DS EN ISO 5801 2017 DS EN ISO 9001 2015 EN ISO 12100 2011 DS EN ISO 12499 2009 DS EN ISO 12944 2 2017 ISO...

Page 10: ...02 627 666 907 Table 5 Max weights of ACN ATEX excl motors and accessories kg Fan sizes D mm Motor sizes 71 80 90 100 112 132 160 180 200 225 250 280 Hub diameters 160 230 280 330 and 380 250 30 5 315...

Page 11: ...isc 9 Casing 3 Hub cover 10 Motor flange 4 Rotor 11 Motor 5 Hub boss 12 Terminal box 6 Bolts 13 Motor cable 7 Washer Figure 10 Fan disassembly and assembly Figure 11 Terminal box delta connected for m...

Page 12: ...nal box star connected for motors over 16 A U1 U1 L1 L2 L3 PE PTC PTC W2 V1 U2 W1 V2 PE L N 1 2 L N 1 2 U1 W2 V1 U2 W1 V2 PE V1 W1 W2 U2 V2 Circuit breaker Not Novenco delivery Terminal box delta Fan...

Page 13: ...Pure competence in air ttt EKs E K h E KD...

Reviews: