ROOF EXHAUST FANS

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Italsime Srl Via F. Brunelleschi. 5 / E 50013 Campi Bisenzio
Tel.: +39 0558921259
Fax.: +39 0558952636
E.mail: info@italsime.com

TIMETABLE: 08.30 - 12.30 / 14.30 - 18.30
WEEKLY REST: Saturday and Sunday

Item number

V23VSA

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AXIAL WALL WENTYLATORS

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Flow rate: 10102 - 77340 [m³/h] | Pressure: 0 - 3 [mmH₂O]

The VSA series is particularly suitable for moving large volumes of air with low pressures.

The VSA series has been designed specifically to operate in highly corrosive environments or in environments with abrasive substances.

■ ATEX non-sparking version: shims on non-rotating parts potentially in contact with the fan in non-ferrous material.
■ Anticorrosive execution of paint choirs or special materials.
■ High temperatures with cooling fan up to 300 ° C, special executions on request for temperatures up to 450 ° C.

spare-parts-centrifugal-fan---arrangement-5 — Exploded VSA series

1) Square Washer

2) Puley (big)

3) Belt

4) Puley (small)

5) Electric Motor

6) Motor Support Arm

7) Crossing Hub

8) Standard Arm

9) Bearing + Spacer

10) Blade Hub

11) Blade
12) Box Panel
13) Venturi Nozzle
14) Gravity Shutter

DEFECTS

CAUSES

POSSIBLE REMEDIES

The machine does not start

1) Power supply

2) Electrical connection

3) Defective engine

4) Mechanics

5) Wrong motor size

1) Check that the main power switch of the electrical control panel of the machine is in the ON position.
Check that protection fuses are not blown
Check the correct supply voltage

2) Check the correct execution of all connections in the terminal box of the electric motor.

3) Replace the motor.

4) Check that all the transmission belts are intact
Check the tension of the transmission belts
Check the tightness of the pulleys

5) Replace the engine.

The engine is overheated

6) Overload

7) Wrong motor size

8) Start-up time too long

6) Check that the mechanical parts moved by the motor are not subjected to unexpected resistance

7) Replace the motor

8) The impeller PD2 has been underestimated, change the motor.
Correct the start-up methodology.

Excessive electrical absorption

9) Circuit

10) Defective engine

11) Wrong motor size

12) Impeller

9) Possible accretion of dirt in the impeller seat collar
Possible ingress of foreign bodies into the fan which slow down the impeller movement
Check the correct operation of the dampers

10) Replace the motor.

11) Replace the motor.

12) Check the RPMs
Check the direction of rotation of the impeller

Overheated bearings

13) Damage

14) Transmission

15 ) Mechanics

13) Replace the bearings.

14) The tension of the drive belts is excessive..

15) The bearings are not correctly aligned
The transmission shaft is not straight

Degraded transmission belts

16) Incorrect pretensioning
17) Incorrect assembly
18) Incorrect alignment of the pulleys
19) Worn pulleys
20) Strong vibrations
21) Insufficient voltage
22) Excessive tension
23) Excessive scrolling
24) Life exceeded
25) Dirty / foreign bodies
26) High temperature:> 80 [° C]
27) Leaks from engine, bearings or engine block

16) Replace the belt and adjust its tension
17) Replace the belt and mount it correctly
18) Align the pulleys and replace the belt
19) Replace the pulley + belt unit and retension the transmission
20) Check the belt tension and replace it
21) Replace the belt and retension it
22) Replace the belt and retension it
23) Replace the belt and retension it
24) Replace the belt
25) Clean / remove foreign bodies and replace belts
26) Use belts for high temperatures or remove the cause of overheating
27) Eliminate leaks, clean the pulleys, replace the belt

Twisting the drive belt

29) Poor alignment of the pulleys
30) Worn throats
31) Wrong groove profile
32) Strong vibrations
33) Insufficient voltage
34) Wear of the belt sides

29) Align the pulleys and replace the belt
30) Replace the pulleys
31) Replace the pulleys
32) Check the belt tension
33) Replace the belt and retension it
34) Replace the belt

Broken drive belt

35) undersized transmission
36) Forced assembly

35) Recalculate the transmission
36) Replace the belts and assemble them without forcing them

Lubricant leaks

37) Defective or worn sealing rings
38) Worn shaft seal seat

37) Replace the sealing rings or replace the bearings
38) Replace the sealing rings or replace the shaft

Excessive or abnormal noise

39) Impeller
40) Case / Auger
41) Mechanics

39) Check the minimum distances
Tighten the impeller hub
Check that there are no excessive obstructions at the pressing mouth (severe and intermittent noise) or suction (acute and continuous noise)
Clean the dirt that has settled on the blades
Rerun balancing

40) Check the minimum distances

41) Tighten collars and mouthpieces
Tighten the bearing collars on the shaft.
Replace defective bearings
Tighten the pulleys on the motor / impeller shaft
Check the correct tension of the belts
Check the state of wear of the belts
Check the alignment of the pulleys

Excessive or abnormal vibrations

42) Engine
43) Impeller
44) Worn bearings
45) Worn anti-vibration joints
46) Transmission joint (Misalignment)
47) Transmission joint (Loose screws and / or micro clutches under the screw head)
48) Drive coupling (Loose locking nut)

42) The motor runs in one phase
There is an electrical imbalance in the motor
43) Check / re-balance the impeller
44) Replace the bearings
45) Replace the damaged anti-vibration joints
46) Realign the joint
47) Check the joint parts and if damaged replace it, replace the fixing screws and tighten them completely
48) Correct the alignment of the joint, correct it if necessary and tighten the hub fixing screw

Breakage of fixing screws

49) Mechanics

49) Reduce the vibrations of the impeller and / or the motor.

Low flow

50) Circuit
51) Fan

50) Check that the flow regulation devices have the correct degree of opening.
Check that there are no abnormal or unexpected obstructions of the suction or pressing mouth
Installed protection grids are too tightly woven (if allowed / allowed replace the protection grids)

51) Check that the impeller rotates in the correct direction.
The fan is undersized
Check the angle of incidence of the impeller blades (Angle of attack too low)
Check that the impeller rotates at the correct rotation speed (Increase the RPM)

High flow rate

52) Air circuit
53) Fan

52) Check that the flow regulation devices have the correct degree of opening.
Protection grids not installed
Installed protection grids have too dilated weft (if allowed replace the protection grids)

53) Check that the impeller rotates at the correct rotation speed (Reduce the RPM)
Check the angle of incidence of the impeller blades (Angle of attack too high)

Wrong static pressure

54) Air circuit
55) Fan

54) Check that the pressing or suction mouth does not show any obstructions to the air flow
Clean the protection grids
Clean the flow regulating devices
Check that the flow regulation devices have the correct degree of opening
Check that the flow regulation devices are functioning in all their parts

55) Clean the impeller
Clean the impeller case
Clean the mouthpiece and / or the pressing mouth

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