Geovent LEF 400, LEF 355, LEF 450, LEF 500, LEF 560 Instruction Manual

INSTRUCTION MANUAL

Version 2.3 04.02.16

FAN

LEF/MEF 250 - 630

www.geovent.dk

2

Table of content

1.0 General safety precautions...................3

1.1 Danger .................................3

1.2 Field of application . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Technical data ............................3

1.4 Construction .............................3

2.0 Installation ...............................4

2.1 Connection of fan to the mains ...............4

2.2 Connection of fan to the mains (freq. inv.) .......5

2.3 Optional equipment ........................5

2.4 Trial run – exact adjustment .................6

3.0 User instruction – application ................6

4.0 Maintenance..............................6

4.1 Trouble shooting ..........................6

4.2 Dimensions...............................7

4.3 Graphs pressure drop.......................7

5.0 Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.0 Declaration of conformity ...................10

1.0 General safety precautions

1.3 Technical data

G L E F-180-3

Fan Designation

No. of phases on motor

Size of impeller in mm.

Flange motor B5

Backward curved impeller

RPMs: M=2800 L=1400 rpm

EEX-e protected version

Fan

Name plate

Motor

Name plate

IMPORTANT - Please study all the instructions before
mounting and commissioning.

This instruction manual is valid for MEF/LEFfans.
LEF/MEF is standard motor where an external

frequency inverter can be connected. More specic

data regarding frequency inverters can be found in the

specic manual for the inverter.

Please keep these instructions in a safe place and
instruct all users in the function and operation of the
product.
Do not dismantle any factory-mounted parts, as it
impedes the commissioning of the equipment.
All electrical installations must be carried out by an

authorised electrician

1.1 Danger

Explosive media – The fan is not suitable for the extrac-

tion of aluminium dust, our, textile dust nor for sawdust

or other media, which are connected with danger of

explosion, without specic approval from Geovent A/S.

Removing the protection net on the fan whilst in opera­tion involves a risk of mutilation.

Temperature extracted air Max 80°C
Temperature surroundings Max 40°C

If the temperature of the extracted air exceeds 80°C,
special bearings must be used. Please contact your
dealer.
The sound level depends on various factors under
various circumstances. For instance, where in the room

the Fan has been installed, the size of the room, the

temperature in the room, the sound of the room and

also the connection (hose><pipe) of the Fan inuences

the sound level of the fan.
As a main rule, a sound box will reduce the actual
sound level to only half the level without a sound box.

The actual ampere consumption and the kW of the
motor are shown on the metal sign on the fan.

1.4 Construction

Always switch o󰀨 the current when mounting something

on the Fan or when servicing it.

1.2 Field of application

The GEOVENT fan LEF is typically used for general

ventilation as well as for smaller process extraction
jobs, where a high pressure is not required. The fan

MEF is applied for process extraction within the indus­try for the extraction of welding smoke, exhaust gasses,
grinding dust and vapours.

The fan is neither suitable for the extraction of alumin-

ium dust, our, textile dust nor for sawdust or other

media, which are connected with danger of explosion,

without prior, written approval from Geovent A/S.

3

Fan housing: 100% galvanized steel for optimal corrosi­on resistance. Brackets are standard on all fans as well

as inlet nozzle with safety net.

Impeller: Backward curved B-impeller in painted Domex
sheet metal.

Motor: B5 ange motor, directly driven IEC/DIN B5
EFF2 quality motor in painted die cast aluminium in
protection class IP-55. Other motor types available on
request.

Console:

5.5kW motors and above or heavy custom motors
come with a supporting console to carry the weight.

Fan, mounted on the roof with
roof bracket, supporting angles
with vibration dampers and

outlet ange

Fan, mounted on the
side by means of a wall
bracket, supporting
angles with vibration
dampers and outlet

ange

Fan, mounted on the
bottom by means of a wall
bracket, supporting angles
eith vibration dampers and

outlet ange

Console

Motors of less than 5,5 Kw do not have a console to
support the weight of the motor.

2.0 Installation

The Fan is supplied assembled and ready for
connection to piping and to the mains.

Before mounting the fan, please make sure that the
optimum installation area is selected.
Is there space enough for carrying out satisfactory
installation/service of the fan? What about optimum
connection possibilities for piping and automatics?
If at all possible, please avoid bends just before the
intake and after the outlet, since since this may reduce
the e󰀨ectivity of the fan.
For outdoor mounting, any noise nuisances for neig­hbours should be taken into account and also ensure
that the motor is kept out of heavy showers.
Drill holes in motor housing and remove drain plugs
from the motor.

Procedure:

1. The fan is solidly xed to the roof/oor or to a
ceiling bracket or wall bracket (see gure 1). The
fan is xed by attaching the vibration dampers with
4 o󰀨 M8 bolts. The Fan is to be mounted in one

of the shown ways. Do not install the Fan with the
intake in vertical direction.

2. The piping is connected to the fan. On the inlet
side, the pipe may be fastened by means of self
cutting screws. Remember to seal the connection

with ller!

3 On the outlet side, the pressure connecting piece

(optional equipment) is attached to the fan by me­ans of the supplied clamps. Remember to seal the

connection with ller!

4. The pressure connecting piece is then attached to
the piping on the outlet side by means of self-cut-

ting screws. Remember to seal the connection!

2.1 Connection of fan to the mains

- standard motor

1. The fan should only be connected to the mains by

a certied electrician and a motor protection switch

should always be used.

2. Our 3-phase motors may be congured to both
3x230V and 3x400V. From the factory, the motor
has not been congured and the enclosed metal

cover plates are to be mounted in such a way in

the terminal box that they t the voltage.

4

2.3 Installation of optional equipment

Mounting of sound box
From the factory, the fan will be installed in the sound
box (optional equipment). The box must be mounted

on horizontal surfaces and may only be mounted with

vertical outlet.

Mounting of frequency converter
Our standard 3-phase motors are particularly suitable
for frequency converter operation.

Suggested application – frequency inverter

Always double check the metal sign on the motor
and on the inner side of the cover for current

congurations (diagram).

From 4,0 kW motors and up:

∆ 400… 460V 50/60Hz
Y 690 50Hz

Our 3 phased motors at 4,0 kW and larger are

congurable for both 3x400, 440V and 3x690V.
By default the motor is not congured and the jumper

bars must be installed in the terminal box according to
voltage.
Double check the metal sign on the motor and the

inside of the lid for current conguration.

2.2 Connection of fan to the mains

- Motors with integrated
frequency inverter.

Installation of frequency inverter

Our standard 3-phased LEF/MEF fans are highly
suitable for operation with frequency inverter allowing
for pressure control and speed control.

Draft of installation with frequency inverter:

Channel – spiro duc

Suction tube

Terminal box

3x400V + PE

Multi

box

1x230VAC

Frequency inverter

3x400V

3-conductort
0-10DC

Switch

Draft of installation with
pressure guard and motor guard:

3.Connection diagram 1-phase motor
(Not suitable for regulation) up to 2,2 kW

Draft of installation with potentionmeter:

5

2.4 Trial run – exact adjustment

4.1 Trouble-shooting

After the installation has been completed, please check
whether there are any vibrations in the fan.

We recommend checking whether the fan supplies the
correct volume of air, for which the equipment has been
dimensioned. I.e. control the volume of air and make
sure that it does not exceed the ampere capacity of the
motor.

3.0 User instruction – application

When extracting large quantities of air, containing dust,
the fan wheel may get out of balance due to dirt on the
wheel. In order to avoid this, we recommend using a

lter.

In many cases, the fan is started by pushing the green
button on the motor protection switch (if automatics are
not used).

The fan will not work as intended if:

• unauthorised parts have been mounted on the fan

(e.g. unauthorised wheel).

• the wheel runs in the wrong direction. It will still

work, but the capacity will be reduced to a third of
the normal capacity.

• no motor protection switch is used.

4.0 Maintenance

Periodic maintenance

In principle, the motor is maintenance-free because
of the factory-mounted, completely closed special ball
bearings, which do not require any maintenance.
Replacement of worn bearings should only be handled
by an electrician.
The wheel and the fan housing should be cleaned
every year or according to requirement. The wheel and
the housing may be cleaned by means of a soft brush
and detergent. Remember to disconnect the power
before the washing and to wipe the parts afterwards
with a dry cloth. This operation results in a longer life of
the fan.

Access to the inside of the fan housing and the impel-

ler, can be gained by screwing o󰀨 the umbracko screws

on the back of the fan.

Remember to always cut the power.

Remember to always use a
motor protection switch!

Always use adjustment damper!

In case of problems with the fan, the following items
may be reviewed in order to check whether:

The volume of air or the pressure is too low:

• Wrong direction of operation of the wheel.

May be due to wrong electrical installation.
Please double-check the direction of rotation.
Change two phases, if necessary.

• Leaky channel system.

• Poor inlet/outlet possibilities near the Fan may

reduce the yield (e.g. 90° bend before the inlet).

• Damaged wheel.

• The rotation speed has been set lower.

• If the temperature deviates substantially from the

lab measurements, where the temperature was
20°C with an atmospheric pressure of 101.4 kPa.

• The dampers have not been correctly adjusted.

• The central lid on the sound box is turned the

wrong way and thus blocks the air.

• The suction net has been blocked by cotton waste,

a cloth or the like.

Vibrations and noise

• The base is not even/stable.

• Foreign objects are stuck in the fan.

• Damaged wheel or motor.

• The wheel is loose.

• The wheel may have become unstable, for instance

as a result of dirt on the impellers.

• The wheel is rotating in the wrong direction.

• The fan supplies more air than for which the

equipment has been dimensioned.
Use adjustment damper.

• Loose bolts or screws.

The motor is overtaxed

• The cabling of the motor is not correct.

• The shaft has been bent.

• The fan has over-capacity in relation to the

resistance in the system.
Use adjustment damper.

• The speed of the motor is too high.

• Defective motor – please contact your dealer!

Soundbox - optional

6

J

E

A

L

G

C

F

H
B

K

ø

D

M

I

1

4

6 x M6

M8

5 x M8

ød

ø9

4

8

N

4.2 Table of dimensions

Table LEF/MEF 250 - 630 (LEX/MEX)

Type 250 315 355 400 450 500 560 630

A 410 510 570 648 715 758 907 989

B 500 700 700 800 800 800 800 800

C 500 600 680 756 850 871 1070 1175

øD 250 315 400 400 500 500 630 630

ød *** *** *** *** *** *** *** ***

E 215 260 284 308 340 345 425 446

F 230 290 329 370 408 421 523 563

G 210 240 272 304 340 362 440 467

H 460 660 660 760 760 760 760 760

I ** ** ** ** ** ** ** **

J 170 210 234 260 290 295 375 400

K 320 400 450 500 560 510 709 800

M 637 720 797 965 1045 1065 1340 1340

N 185 225 250 275 305 263 380 425

VÆGT 38* 43* 48* 56* 71* 81* 125* 135*

* The weight depends on which size motor
** Depending on the motor size
*** Depending on which size pressuretub

4.3 Pressure drop

Fan designation

[Pa] Fan LEF / MEF-355

2400

2100

1800

1500

1350

1200

1050

900

750

600

450

300

150

(2p - 57Hz)

n=2860

(2p - 50Hz)

n=2507

(2p - 44Hz)

n=2240

(2p - 39Hz)

n=1460

(4p - 50Hz)
(2p - 25Hz)

►

500

1000 1500 2000 2500 3000 3500 4000 4500 5000 5500

RPM. & resulting frequency
Example: A pressure controlled fan with frequency inverter, is
connected to 4 extraction arms. If all arms are in use, is the

extracted air ow 4.200 m3/h at 1.200 Pa. If the air ew is reduced
to tow extraction arms at the same time, the air ow will regulate

to 2.000 m3/h & the power consumption will be reduced by 50%

[Pa] Fan LEF / MEF-250

1625

1500

1375

1250

1125

1000

875

750

625

500

375

250

125

n=3995

(2p - 70Hz)

n=3480

(2p - 61Hz)

n=2860

(2p - 50Hz)

n=2560

(2p - 45Hz)

n=1460

(4p - 50Hz)
(2p - 25Hz)

200

75%

n=3540

(2p - 62Hz)

n=3277

69d

B(

A)

7

0,25kW

82%

8

9dB

(

►

A

)

8

78%

8

dB

(

A

)

8

5d

B

(

A

)

82

d

B

(

A

)

9

dB

(

A

)

0,75kW

►

1,1kW

1,5kW

68%

2,2kW

51%

46%

3,0kW

E󰀩ciency

Sound level in

outlet without
duct

Pressure drop at

►

a specic air ow

►

consumption

Airflow [m³/h]

69%

83%

79

dB(A)

(

A)

0,18kW

76%

0,25kW

64%

0,37kW

48%

0,55kW

76dB

73B(A)

70

B(A)

57

dB

(A)

0,09kW

400 600 800 1000 1200 1400 1600 1800 2000 2200

Air Flow [m³/h]

Powe

7

[Pa] Fan LEF / MEF-315

64dB

74%

84%

81

dB

(A)

79dB

(A)

77dB

(A)

73

dB

(A)

72

dB

(A

)

(A)

0,37kW

0,25kW

0,12kW

1690

1560

1430

1300

1170

1040

910

780

650

520

390

260

130

n=3200

(2p - 56Hz)

n=2860

(2p - 50Hz)

n=2560

(2p - 45Hz)

n=2280

(2p - 40Hz)

n=2010

(2p - 35Hz)

n=1460

(4p - 50Hz)
(2p - 25Hz)

300

600 900 1200 1500 1800 2100 2400 2700 3000 3300

Air flow [m³/h]

80%

71%

0,55kW

59%

0,75kW

48%

1,1kW

[Pa]

2800

2600

2400

2200

2000

1800

1600

1400

1200

1000

800

600

400

200

Fan LEF / MEF-400

n=3538rpm
(2p - 61Hz)

n=2915rpm
(2p - 50Hz)

n=2675rpm
(2p - 46Hz)

n=2150rpm

(2p - 37Hz)

70dB(A)

n=1375rpm

(4p - 50Hz)

750

1500 2250 3000 3750 4500 5250 6000 6750 7500 8250

75%

79

dB

(

A

0,37kW

84dB

)

82%

86dB(A)

(

A

)

1,1kW

85%

90dB

2,2kW

(A)

80%

Air flow [m³/h]

75%

68%

50%

5,5kW

4,0kW

[Pa] Fan LEF / MEF-355

(A)

75%

79

dB(A)

0,25kW

82dB

82%

89

dB

(A)

88

dB

(

A

)

85

dB

(A)

(

A)

1,1kW

0,75kW

2400

2100

1800

1500

1350

1200

1050

900

750

600

450

300

150

n=3540

(2p - 62Hz)

n=3277

(2p - 57Hz)

n=2860

(2p - 50Hz)

n=2507

(2p - 44Hz)

n=2240

(2p - 39Hz)

n=1460

(4p - 50Hz)
(2p - 25Hz)

500

69dB

1000 1500 2000 2500 3000 3500 4000 4500 5000 5500

Air flow [m³/h]

78%

1,5kW

68%

51%

2,2kW

46%

3,0kW

[Pa] Fan LEF / MEF-450

3250

3000

2750

2500

2250

2000

1750

1500

1250

1000

750

500

250

n=3306

(2p - 57Hz)

n=2900

(2p - 50Hz)

n=2552

(2p - 44Hz)

n=2120

(2p - 36Hz)

n=1395

(4p - 50Hz)

1000

2000 3000 4000 5000 6000 7000 8000 9000 10000 11000

73dB(A)

74%

83dB(A)

81%

0,75kW

86%

92

dB

(A)

89dB(A)

87

dB

(A)

2,2kW

Air flow [m³/h]

81%

74%

62%

49%

7,5kW

5,5kW

4,0kW

8

[Pa] Fan MEF-500

83%

90

92dB(A)

dB(A)

87%

94

dB

(A)

3900

3600

3300

3000

2700

2400

2100

1800

1500

(2p - 57Hz)

(2p - 50Hz)

n=2690

(2p - 46Hz)

n=2430

(2p - 42Hz)

n=2120

(2p - 36Hz)

n=3300

n=2900

77%

87dB(A)

1200

900

n=1585

(2p - 27Hz)

80

dB(A)

600

300

1200

2400 3600 4800 6000 7200 8400 9600 10800 12000 13200

1,1kW

2,2kW

Air flow [m³/h]

97dB(A)

4,0kW

82%

5,5kW

76%

7,5kW

68%

51%

11kW

[Pa]

4000

3750

3500

3250

3000

2750

2500

2250

2000

1750

1500

1250

1000

750

500

250

Fan LEF / MEF-630

79%

n=2600rpm

(2p - 46 Hz)

n=2300rpm
(2p - 41 Hz)

n=2030rpm

(4p - 70 Hz)

n=1830rpm

(4p - 63 Hz)

n=1584rpm

(4p - 55 Hz)

n=1440rpm
(4p - 50 Hz)

2000

4000 6000 8000 1000012000 14000 16000 18000 20000 22000

8

9

8

6

d

B(

8

A)

4

d

B(

A)

d

9

2

B(

A)

d

B(

A)

4,0kW

9

4

d

5,5kW

86%

9

7

d

B

(

A

)

B

(

A)

7,5kW

Airflow [m³/h]

82%

11kW

74%

15kW

62%

52%

22 kW

24000 26000

[Pa] Ventilator LEF/MEF-560

n=2930

(2p - 50Hz)

4000

Fan LEF / MEF-560

65%55%

98dB(

A

)

79%

3000

2000

1000

n=2445

(2p - 42Hz)

n=2146

(2p - 37Hz)

n=1440

(4p - 50Hz)

9

4d

B

(

A

)

9

1

d

B

(

A

)

7

9

d

B

(

A

)

65%

18,5kW

11kW

7,5kW

2,2kW

2000

4000 6000 8000 10000 12000 14000 16000 180002000 0 22000

Volumenstrøm [m³/h]

Air ow (m3/h)

55%

9

5.0 Liability

Warranty

Geovent A/S grants a warranty for products, which are

defective, when it can be proved that the defects are
due to poor manufacture or materials

on the part of Geovent A/S. The warranty comprises

remedial action (reparation or exchange) until one year
after date of shipment. No claims can be made against

Geovent A/S in relation to loss of earnings or

consequential loss as a result of defects on products

from Geovent A/S.

Wear parts like fan impellers are not included in the
warranty.

User liability

In order for Geovent A/S to be capable of granting the
declared warranty, the user/tter must follow this

manual in all respects.

Under no circumstances may the products be changed
in any way, without prior written agreement with

Geovent A/S.

6.0 Declaration of conformity

has been manufactured in compliance with the
directions of the Directive Council 2006/42/EEC,
regarding machine safety, changes of directive
95/16/EEC and following standards:

UNE-EN ISO 12100: 2012

Date: 04/02 - 2016

Position: Managing Director
Name: Thomas Molsen

10

HOVEDGADEN 86 • DK-8831 LØGSTRUP

Tlf.: ([phone] • e-mail: [e-mail]