Novenco Novax acn-acw-arn Instruction Manual

Pure competence in air.

916330-0

NOVENCO® NOVAX™

AXIAL FANS ACN-ACW-ARN

INSTALLATION AND

MAINTENANCE

ENGLISH

916330-0

MU 16075 0621

Novenco®NovAx™ axial fans ACN-ACW-ARN

Installation and maintenance

1. Application

1.1 Reading guide

2. Handling

2.1 Marking

2.2 Weight

2.3 Design conditions

2.4 Transport and lifting

3. Storage

4. Installation

4.1 Preparations

4.2 Installation

4.3 Support frames

4.4 Wire guard installation

4.5 Connection to duct

4.6 Electric connection

5. Start of operation

5.1 Before start-up

5.2 Motors with Y/starting

5.3 Starting procedure

6. Maintenance

6.1 Before maintenance

6.2 Fan casings

6.3 Rotors

6.4 Motors

6.5 Dismounting of motor (fig. 9)

6.6 Mounting of motor (fig. 9)

6.7 Blade pitch adjustment

7. Troubleshooting

8. Inspection and test

9. Sound

10. Safety

11. Spare parts

12. Disposal

13. Patents and trademarks

14. Quality management

15. Warranty

16. Product lifetime

17. Declaration of conformity

1. Application

The axial flow fan types ACN, ACW and

ARN are sturdy standard fans for appli-

cations within land-based industries and

marine sectors.

1.1 Reading guide

Please read this complete guide, before

beginning installation or maintenance.

2. Handling

2.1 Marking

The ACN-ACW-ARN fans have name-

plates on the fans and motors.

Fan nameplate information

•Manufacturer information

•Product type, e.g. ACN 1000/380

•Serial no.

•Fan speed

•Year of manufacture

•Weight

Motor nameplate information

•Manufacturer information

•Power consumption, IE class etc.

•Voltages

•RPMs

•Weight

•Terminal connections

•Lubrication and service info.

•Etc.

Icons Description

Risk of damage to equipment

Risk of injury or death

Table 1. Icons in guide



Table 2. Max. weights of ACN-ARN fans with motors, excl. accessories [kg] 1

1. ARN fans are available with hub sizes Ø403 and Ø578.

Table 3. Max. weights of ACW fans with 6 mm fan casings and motors, excl. accessories [kg]

Fan size

[mm]

Motor size [mm]

-71 -80 -90 -100 -112 -132 -160 -180 -200 -225 -250 -280

Hub diameters [mm]

Ø160, Ø230, 280, Ø330 and Ø380

Ø250 17.3

Ø315 20 23.5

Ø400 33.5 37 43 50.5

Ø500 48.5 52 58 65.5 69 90

Ø560 61.5 65 71 78.5 82 103 142

Ø630 66.5 70 76 83.5 87 108 147 205

Ø710 79.5 83 89 96.5 100 121 160 218

Ø800 88.5 92 98 105.5 109 130 169 227

Ø900 104.5 108 114 121.5 125 146 185 243

Ø1000 150 157.5 161 182 221 279

Hub diameters [mm]

Ø403 and Ø578

Ø900 165 240 298

Ø1000 205 244 337 382

Ø1120 154 215 262 354 410 489

Ø1250 175 240 278 375 432 510 574

Ø1400 251 356 414 470 549 623 1179

Ø1600 496 621 660 1216

Fan size

[mm]

Motor size [mm]

-71 -80 -90 -100 -112 -132 -160 -180 -200 -225 -250 -280

Hub diameters [mm]

Ø160, Ø230, 280, Ø330 and Ø380

Ø250 29.5

Ø316 38.5 42

Ø400 54.5 58 64 71.5

Ø500 67.5 71 77 84.5 88 109

Ø560 96.5 100 106 113.5 117 138 177

Ø630 105.5 109 115 122.5 126 147 186 244

Ø710 127.5 131 137 144.5 148 169 208 266

Ø800 144.5 148 154 161.5 165 186 225 283

Ø900 172.5 176 182 189.5 193 214 253 311

Ø1000 206 213.5 217 238 277 335

Hub diameters [mm]

Ø403 and Ø578

Ø900 230 304 362

Ø1000 291 330 388 430

Ø1120 287 347 387 445 487 566

Ø1250 333 397 437 495 537 616 655

Ø1400 398 512 570 612 690 730 1274

Ø1600 684 763 802 1347

2.2 Weight

The total weights shown in tables 2, 3

and 4 are determined on the basis of fan

type and size, and the maximum motor

size employed.

2.3 Design conditions

The ACN-ACW-ARN fans are designed

for operation at standard temperatures

from -20 to +50 °C. With reduced fan

speed and increased blade clearance the

temperature range canbe extendedfrom

-40 to +120 °C. Contact Novenco for de-

tails.

2.4 Transport and lifting

Any transport or lifting of the

fans must be in accordance to

current directives, regulations

and guidelines for safety. Pay attention

to limitations and directions for use of

lifting gear.

The fans are delivered on pallets or bear-

ers to allow for forklift transport.

Transport and lifting must be done with

care, as the fans are vulnerable to vibra-

tions and shocks. These can result in im-

balance and deformations.

Refer to the weights in the shipping pa-

pers, on the motor and fan casing name-

plates and in tables 2, 3 and 4.

Check the fans and accessories

for damages upon receipt. Also,

check that the rotors rotate

freely in the fan casings. Inform the

carrier and Novenco immediately of

damages.

Further transport depends on the fan

size and the fitted accessories.

Transport

•Fans mounted on support frames

Transport and store these on the

transportation pallets. Leave in the

transportation rods for fans with

vibration dampers.

•Fans without support frames

Transport fans resting on the inlet

flanges or cones. The rotors must

point downwards.

•Large fans or fans with large

motors

Transport and store these on the

transportation pallets. Store very

large fans on suitable bearers.

Lifting

•With straps

Lift with a strap around the fan

casing at the centre of gravity.

Please note, that directives,

regulations 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 onmotors 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.



Conditions Specifications Comments

Outdoor One month • Packaging must be

intact

Indoor or

sheltered Max. six months

• For unprotected

fans with no or

broken packaging

• Ventilated

location

• No condensation

Prolonged Max. two years

• Indoor

• Remove

packaging

• 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

Temperatures -25 to 65 °C

• Constant

temperature,

preferably 20 °C

• Ventilated

• No condensation

Humidity Below 70%

• Avoid

condensation

• Exceedance

requires airtight

packaging of

complete fan and

use of a moisture

absorbent agent

such as silica gel

Table 2. Storage recommendations



Table 4. Max. weights of ACW fans with 10 mm thickness of plate in tubes and motors [kg]

Table 5. Max. motor weight estimates [kg]

Fan size

[mm]

Motor size [mm]

-71 -80 -90 -100 -112 -132 -160 -180 -200 -225 -250 -280

Hub diameters [mm]

Ø160, Ø230, Ø280, Ø330 and Ø380

Ø250

Ø316 50.5 54

Ø400 74.5 78 84 91.5

Ø500 102.5 106 112 119.5 123 144

Ø560 129.5 133 139 146.5 150 171 210

Ø630 143.5 147 153 160.5 164 185 224 282

Ø710 178.5 182 188 195.5 199 220 259 317

Ø800 201.5 205 211 218.5 222 243 282 340

Ø900 245.5 249 255 262.5 266 287 326 384

Ø1000 294 301.5 305 326 365 423

Hub diameters [mm]

Ø403 and Ø578

Ø900 304 378 436

Ø1000 341 417 475 518

Ø1120 392 453 492 550 592 671

Ø1250 464 528 568 626 668 747 786

Ø1400 553 667 725 767 846 885 1429

Ø1600 861 940 980 1524

Motor types -71 -80 -90 -100 -112 -132 -160 -180 -200 -225 -250 -280

Motor

weights 6.5 10 16 23.5 27 48 87 145 190 270 305 850

4. Installation

4.1 Preparations

Complete the below checklist to ensure a

safe work environment and fan function-

ality.

Checklist prior to installation

•Unpack the fan with care.

•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

and conforms to the applicable IP

class. 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-

conductive 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 against solid objects

up to 12 mm.

Also, install wire guards on fans

where there is direct access to the

rotor. Wire guards from Novenco

can be installed as close as 120 mm

before and after the rotor.

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 hard surface. 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

Generally, it is of the utmost importance

for the performance and sound levels of

axial fans that the airflows are unimped-

ed and free from eddies.

Installation of fans

1. Place and orient the fans in

accordance with the airflow

direction arrows on the fan casings.

2. Adjust the fan positions to have the

motor drain holes point downwards

at the lowest point.

The environment and

conditions of operation may

cause condensation in the fan

motors. It is therefore important, that

the motor drain holes point

downwards, are at the lowest point and

are open. On fan motors mounted at

angles, the drain holes are typically in

the motor back-covers. Contact

Novenco if the drain holes are missing.

3. Unplug the lowest positioned drain

holes on the motors.

4. Recommendation: Install the fans on

support frames. See section “4.3

Support frames”.

The support frames are optional and

available from Novenco.

5. Optional: As an alternative to

installation on support frames, fans

may be suspended in the casing

flanges or in special carriers. The

carriers must not obstruct the free

inlet and outlet of air.

6. Check thatthe fan rotors rotate freely

once the fans are in position and

finally secured.

7. Fans on support frames and with

vibration dampers: Remove the

transportation rods from the support

frames. The handles are marked with

a strong colour.

4.3 Support frames

Support frames for the ACN-ACW-ARN

consist of two mounting plates. See fig. 1,

item 01.

Mount the two stiffeners (item 02) be-

tween the mounting plates by means of

joining elements (item 03). Stiffeners are

only available for fan size 630 mm and

up.

To prevent spread of vibrations from the

fan to the surroundings, anti-vibration

mountings are optionally available from

Novenco and may be inserted between

fan and support, between fan and flexi-

ble connections or a combination of the

two. Anti-vibrational measures can also

be fitted in the ducts before and after the

fan.

Secure anti-vibration mountings (fig. 2,

item 06) in the support frame by means

of bolts (item 05).

Mount base plates (item 07) for attach-

ment to the foundation at the bottom of

the anti-vibrational rubber elements.

The natural frequency of the

support must lie at least 20%

from the fan speed.

The anti-vibration mountings serve to

ensure that the natural frequency of the

system does not exceed 10 Hz and that

the damping is at least 80% at 1500 RPM.



Figure 1. Support frame for ACN



If needed, contact Novenco for help with

calculation of anti-vibration mountings.

4.4 Wire guard installation

Fans must always be installed so that

parts that rotate cannot be touched. The

fans can be optionally fitted with wire

guards on the inlet and outlet sides. If

ducts are connected, these can alterna-

tively be provided with wire guards.

Novenco offers wire guards for in-pipe

installation on outlets. Drill holes in the

pipe and fixate with bolts and nuts.

4.5 Connection to duct

In order to achieve the capacities stated

on the performance curves the fans must

be provided with ducts as shown in fig.

5 and fig. 6.

The duct or inlet cone on the fan inlet

side must be designed to ensure smooth

and undisturbed flow of the air. Avoid

sharp bends immediately in front of the

inlet opening and place flexible connec-

tions at least 0.5 x the fan diameter, D, in

front of the leading edge of the rotor.

ACN-ACW-ARN fans are prepared for

circular duct connection on both inlet

and outlet sides.

Flanges supplied as standard for type

ACN comply with Eurovent 1/2.

Flanges supplied as standard for type

ACW comply with DIN 24154 row 4.

Systems with higher vibration level or

more exacting performance require-

ments must be provided with expansion

joints between fan and duct. Ducts must

not be supported by the fan.

It is important to allow for free areas to

facilitate mounting and dismounting as

well as ordinary maintenance.

4.6 Electric connection

The installation and connection

to the supply network must be

done by authorised personnel

and according to current local

legislation, e.g. the EU standard for

electromagnetic compatibility (EMC).

Connection of the supply voltage de-

pends on the motor type and if a frequen-

cy 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

The terminal box is on the outside of the

fan casing. Connection diagrams are in-

side the box lid.

The cable run must be in accordance

with current regulations, e.g. the EU

standard for electromagnetic compati-

bility (EMC).

Frequency converters must be installed

in accordance to the manufacturer’s

installation documentation. Refer also to

the Novenco document “Configuration

Figure 2. ACN with support frame and anti-

vibration mountings

Figure 3. ACN with mounting plate,

flexible connection and anti-

vibration mountings

Figure 4. In-pipe installation of wire guard

Ø400 - Ø560:

Ø630 - Ø1000:

Ø1120 - Ø1600:

6 x Ø7 mm

8 x Ø7 mm

8 x Ø9 mm

20Eyebolt

Nut

Figure 5. Installation in duct system

Figure 6. Inlet cone for connection to duct

Figure 7. Optimal installation

Figure 8. Minimum installation

3 x D>3 x D>

½Dr>

D = Fan diameter

Built into duct

Free inlet

D>D>

½Dr>

½D>D>

Built into duct

Free inlet

D = Fan diameter

1234 67 8 9 1011

13125

Figure 9. Exploded view of axial flow fan types ACN-ACW-ARN

1. Centre bolt

2. Centre disc

3. Hub cover

4. Rotor

5. Hub boss

6. Motor bolts

7. S-washer

8. Hub dish

9. Fan casing

10. Motor flange

11. Motor

12. Terminal box

13. Motor cable

of frequency converters for Novenco

fans”.

Shield and connect the fans electrically to

ground to eliminate interference and to

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

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.

The rotor must be completely

stationary, before restart of the 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 out-

side of the fan casing. Flick the fan power

briefly On, then Off. If the direction is

wrong, disconnect the main power sup-

ply and check the connections.

5. Start of operation

5.1 Before start-up

Check the fans and installation location

in accordance to the below checklist and

correct and improve as necessary.

Checklist

•Safe operation

The blade clearance must be

minimum 0.1x motor shaft

diameter (min. 2 mm, max. 13 mm)

all around the rotor circumference.

The axial distance between the

rotor hub and stator must be min.

3.5 mm.

Wire guards should be mounted on

the inlet and outlet sides.

•Transportation rods

Fans on support frames and with

vibration dampers have

transportation rods in the support

frames, which must be removed

before start of operation. The

handles are marked with a strong

colour.

•Clean ducts

The fans andduct connections must

be clean and free from tools and

objects that can affect the airflow.

•Electrical connections

The electrical connections must be

correct and in accordance to the

prescribed requirements. Switch

the fan power briefly On, then Off,

to check the rotational direction of

the rotor.

5.2 Motors with Y/ starting

Set the relay for start of the fans to the

start-up time from the technical specifi-

cations from the AirBox program. Alter-

natively, calculate the value with the be-

low formula.

Calculation of start-up time

The motor torque can vary within the be-

low limits and affect the start-up time.

5.3 Starting procedure

Start the fan.

The maximum allowable fan speed de-

pends among other things on the ambi-

ent temperature and the space in front

and behind of the fan. Refer to the Air-

Box calculation program and technical

fan specifications.

Check that no abnormal noises occur.

See that the vibration level is normal. The

vibration level at the fan operating speed

must not exceed 7 mm/s rms, measured

radially at 2 points, 90ºoffset and at the

free shaft end of the motor. Otherwise,

the fan must be balanced. Operation at a

higher vibration level exceeding 11 mm/

s rms* is not allowed in case of fixed fan

position.

Operation at a higher vibration level ex-

ceeding 18 mm/s rms* is not allowed in

case of position on feet or anti-vibration

mountings.

After 30 minutes of operation check that

the fan operates normally.

* ISO 2954, Requirements for instru-

ments for measuring vibration severity.

The fans are designed for

continuous operation. The

below kinds of operation may

cause fatigue breaks in the rotors and

endanger people.

•Operation in stall area, i.e. with

counter pressure that pulsates -

called pump mode

•Operation with uninterrupted

and repeated starts and stops

•Uneven flow velocity through

the fans

Ask Novenco if in doubt.

6. Maintenance

6.1 Before maintenance

Switch off the power and

disconnect the motor cable in

the terminal box, before

beginning work on the rotor and motor.

6.2 Fan casings

The fan casing requires no maintenance

other than ordinary cleaning.

If the fan casing is painted, the painted

surface should be checked regularly and

repaired where necessary.

6.3 Rotors

At the factory, the rotor blades are set to

the pitch that corresponds to the desired

operating point with regard to pressure,

airflow and fan speed. To ensure vibra-

tion-free operation the rotor has been

carefully balanced in this position.



ts=

ts: Start-up time [s]

P : Rated output of motor [kW]

Pv: Required power of fan [kW]

n : Fan speed [RPM]

:Ratio between the start and

the nominal motor torque

:Ratio between maximum and

nominal motor torque

Iv:Polar moment of inertia for fan

[kgm2]

Im:Polar moment of inertia for

motor [kgm2]

Ms: -15% to +25% of catalogue val-

Mk: -10% to 0% of catalogue value

0.24 n2ImIv

+ 

104PMs

------- Mk

-------- Pv

------

–+

 

 



-----------------------------------------------------------------

-------

--------

Vibrations that occur during operation

are normally due to accumulations of

dust or dirt on the hub and blades. If the

vibrations remain after cleaning, expert

assistance should be called in immedi-

ately,ascontinuedvibrationsshortenthe

life of the motor bearings.

6.4 Motors

Refer to the motor manufacturer’s docu-

mentation and the nameplates for how

to service the motors.

Motor maintenance

•Inspect the motor for wear signs

and damaged parts.

•Clean the motor casing, motor

cooling fan and motor shell.

•Drain the motor of condensed

water.

•Check supply cables and electrical

connections for impairments.

•Check terminal box seals and cable

glands.

•Lubricate bearings

Refer to the motor manual for

service information such as

lubrication intervals, grease

amounts, when to replace bearings

etc.

-AC motors up to size 132 have

lifetime-lubricated bearings.

Motor sizes 160 to 280 require

lubrication according to the

manufacturer’s instructions.

Fans with motor sizes 225 to 280

have nipples on the outer fan

casings. For fans with motor sizes

160 to 200, nipples on the outer

fan casings are optional.

Refer to the motor nameplates for

recommended grease type,

amount and interval.

6.5 Dismounting of motor (fig. 9)

Prior to commencing the work, switch

off the current and disconnect the motor

cable. Next, dismount any ducts on the

fan inlet and outlet sides. Remove the ro-

tor centre bolt (item 01), centre disc (item

02) and hub cover (item 03).

Dismount the rotor by means of a puller

fastened in the 2 threaded holes of the

hub boss (item 05).

Detach the motor by loosening the bolts

in the motor shell (item 06). Remove the

motor (item 11) and motor flange (item

10).

In dismounting and disassembling the

fan be careful not to expose the individ-

ual parts to shocks et., as these are likely

to damage the motor bearings or other

fan components.

6.6 Mounting of motor (fig. 9)

After service, remount the motor; see

that the motor flange (item 10) is correct-

ly located and that the motor shaft is con-

centrically placed in the fan casing be-

fore tightening the bolts (item 06).

Mount the rotor (item 04) on the motor

shaft by means of a tool fastened in the

threaded hole of the motor shaft. Fix the

rotor hub to rest against the motor shaft

collar.

Use a feeler gauge to check that the blade

tip clearance between the rotor blade tips

and fan casing is the same throughout

the circumference. If it deviates, adjust

the motor position in the suspension ar-

rangement.

Use a manual grease gun

for lubrication.

Excess grease causes

bearings to overheat and results

in failure.



Motor

size Poles

Lubrication Grease

amount

[g]

50 Hz 60 Hz

160

2 22000 20000

25000 250006

180

2 17000 14000

25000 250006

200

2 15000 12000

25000 250006

225

250

280

2 5000 4000

4 14000 12000

6 20000 17000

8 24000 20000

2 4000 4000

4 13000 10000

6 18000 16000

8 20000 20000

Table 3. Grease amounts and intervals for

WEG W22 TEFC motors – ball

bearings

Motor

size Poles

Lubrication Grease

amount

[g]

50 Hz 60 Hz

160

2 16000 12000

25000 250006

180

2 11000 8000

25000 250006

200

2 9000 6000

25000

21000

625000

225

250

280

4 11000 9000

276 16000 13000

8 20000 19000

4 9000 7000

346 14000 12000

8 19000 17000

Table 4. Grease amounts and intervals for

WEG W22 TEFC motors – roller

bearings

Size Torques [Nm]

Motor bolts (06) Centre bolt (01)

M6 9 6

M8 23 12

M10 45 20

M12 78 20

M16 190 25

M20 370 25

Table 5. Tightening torques

Fan size,

ØD [mm]

Minimum

[mm]

Fan size,

ØD [mm]

Minimum

[mm]

250 0.4 800 0.8

315 0.5 900 0.9

400 0.6 1000 1.0

500 0.5 1120 1.1

Table 6. Blade tip clearances at standard

temperatures

Mount the centre bolt (item 01), centre

disc (item 02) and hub cover (item 03).

Replace lock washers and nuts during

fan assembly. Finally, connect the motor

cable (item 13) in the terminal box (item

12) and any ducts.

To start the fan follow the procedure de-

scribed in section “5. Start of operation”.

6.7 Blade pitch adjustment

The blade pitch has been adjusted in the

factory with a special tool (fixture) to de-

liver the performance required by the

customer.

If the fan performance is required to be

changed itis possible to change the blade

pitch. It requires knowledge of the motor

load and the max. permissible blade

pitch on the graph as related to the motor

rating (in case of blade pitch increase).

Contact Novenco before any such ad-

justment of the blade pitch. Novencocan

supply special tools for blade pitch ad-

justment and instructions for rotor bal-

ancing. The brochure “Blade Angle

Tool” is available on request.

7. Troubleshooting

It is recommended to go through the be-

low checklist in case of breakdowns or

lack in performance. Call for service, if

problems persist.

Lack in performance

•Damper closed

•Duct choked

•Supply fan, if any, stopped

•Motor defective

•Motor disconnected

•Wrong direction of rotation of rotor

Noise and vibrations

•Bearings in electric motor defective

•Rotor out of balance

•Rotor worn or damaged

•Bolts or components loose

•Rotor blades have different pitch

angles

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

- Electrical connections

Enter all values and observations in a

log.

9. Sound

The sound generation of the fans de-

pends on installation and operating con-

ditions, hence no general data of the

sound generation can be given.

Refer the product catalogue, AirBox

computer program and the technical fan

specifications.

10. Safety

The NovAx axial flow fans must be in-

stalled according to Novenco’s, the cur-

rent and the local safety regulations. At

a minimum these include EN 13850.

It is recommended to review and revise

safety procedures regularly.

Safety check

•Test if safety procedures and the

installation work correctly.

•Check if safety regulations have

been changed and if the installation

needs revising.

•Consider taking additional

measures to improve the safety of

the installation. For example, by

mounting wire guards on inlet and

outlet.

11. Spare parts

Contact Novenco for information about

and ordering of spare parts.

12. Disposal

Dispose of fans suitable for scrapping in

environmentally safe ways and in

accordance to current regulations.

The fans and especially the electric

motors contain a wide range of

materials, which can all be recycled.

Make sure worn-out motors and fan

parts are disassembled and recycled for

the benefit of the environment.

560 0.6 1250 1.3

630 0.6 1400 1.4

710 0.7 1600 1.6

Fan size,

ØD [mm]

Minimum

[mm]

Fan size,

ØD [mm]

Minimum

[mm]

Table 6. Blade tip clearances at standard

temperatures (Continued)

Novenco Building & Industry A/S

Industrivej 22 Tel. +45 70 77 88 99

4700 Naestved www.novenco-building.com

Denmark

13. Patents and trademarks

Novenco®, , and are

registered trademarks of Novenco

Marine & Offshore A/S.

ZerAx®is a registered trademark of

Novenco Building & Industry A/S.

AirBox™ and NovAx™ are trademarks

of Novenco Building & Industry A/S.

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