Datasheet

ENGLISH
6. MAINTENANCE AND CLEANING
Maintenanceoperationsoffansarerelativelysimple,buttheystillrequireroutineoperationsaimedtomaintaintheirefficiencyof
alltheircomponentsandtoavoiddamageswhichwouldnegativelyaffecttheirgoodworkingorderandpeople’ssafety.Theinter
val of maintenance operations depends on the fan effective operating conditions. In ideal and continuous operating conditions, it
isadvisabletosubjectthefantoamaintenanceoperationafterthefirst100hoursofoperation,thenevery3000hoursfordirectly
coupled fans.
If the technical datasheet contains a table summarising the planned maintenance operations which states the frequency they
should be carried out at, strictly follow these instructions. Before starting any maintenance operations, stop and drain the fan and
put the machine in a safe condition (see chapter 7). When removing any dust from inside the machine, make sure not to disperse
it in the surrounding environment.
Impeller: it is recommended to constantly check that the impeller is clean. If layers of material, dust, greasy substances etc. should
build up on the impeller, they would cause it to get unbalanced and would lead to damages to drive parts and/or to the electric
motor.Duringthecleaningoperations,allpartsoftheimpellermustbecleaned;anyresiduesinconfinedareascouldleadtomore
unbalanceofamoreevenlayerofdirt,thereforethecleaningoperationmustbethorough.Morespecifically,forimpellerswith
curved blades, conveying statically charged materials or containing adhesives or resins can cause a build-up on the back of the
blades. Therefore a thorough cleaning is recommended to make sure any residual dirt is evenly spread, thus avoiding any unba-
lance.Ifthecleaningoperationisrequiredtoooften,isitadvisabletoreplacetheimpellerwithanimpellerwithaspeciallyprofiled
blade. For more information, contact the manufacturer. When abrasive powders or highly corrosive air are taken in by the fan, the
vibrations may be caused by the wear and tear of the impeller. In this case, replace it with a genuine part. The manufacturer shall
not be responsible for damages occurring to drive parts and/or to the motor caused by dirt on the impeller.
Scroll: clean the internal parts by removing any foreign body; check the condition of the welding and their resistance to oxida-
tion.
Motor: the motor must always be kept in clean conditions so that it does not have any traces of dust, dirt or other impurities.
Periodically check that it works without vibration or abnormal noises, that the ventilation circuit inlet (if present) is not obstructed,
leading to potential overheating of the windings.
Bearings:themajorityofmotorsweusearefittedwithlifelubricatedwatertightbearings,whichdonotrequirelubrication.Theirlife
varies according to the actual operating conditions (number of start-ups etc.) and the operating ambient conditions (temperature,
presence of dust etc.). Our fans are sized in order to give at least 20,000 hours of operation (according to the model) for conti-
nuous operation, in ideal environment and conditions. However, we recommend the bearings to be replaced every 4 years with
bearings with the same features as the original bearing. For models requiring a periodic lubrication, read the technical manual,
which contains the lubricating instructions and intervals. If in doubt, contact the manufacturer. Nuts and bolts: check that they
are not oxidised; oxidation will jeopardise their functionality; replace them with identical nuts and bolts and systematically tighten
them.
Check the condition of the seals after removing all bolted parts (inspection door, disk etc). When the seals no longer ensure the
correct tightness, they must be replaced.
During the cleaning stages, the user must select suitable products to the type of system and to the safety datasheet of the con-
veyed product.
Before starting the fan, make sure no metal foreign bodies are left inside the fan body.
Repeat the required operations before and after start-up (chapter 5).
CHECKING MINIMUM SAFETY DISTANCES
At each maintenance operation, it must be checked that all the spaces between the impeller and the mouthpiece, between the
back of the impeller and the adjacent wall, between the shaft passage and the seal have not decreased or changed in any way.
• Thescrewscouldhavecomelooseandafanrealignmentmayberequired
• Thefanmayhavegotdeformedandsomecomponentsorthewholefanmayneedreplacing.
WARNING: If the technical datasheet contains a table with the minimum values between spaces, these values must be
carefully checked.
ROUTINE MAINTENANCE
In a typical fan, the planned maintenance operations are the bearing lubrication operations (if they are not watertight) and the belt
tensioning operations. Before starting the maintenance operations, make sure the machine is safe to operate.
Carry out maintenance operations only with the machine switched off. As for maintenance operations, the user must ensure that
the tools and equipment used are of a suitable class for the environment. If the machine maintenance requires some hot proces-
ses, thoroughly clean it before starting the work.
UNSCHEDULED MAINTENANCE
Fanspecialapplicationssometimesrequirespecificunscheduledmaintenanceoperations,suchasreplacingtheimpellerorthe
motor.
Unscheduledmaintenanceoperationsmustbecarriedoutonlybyqualifiedstaff,whomustfollowspecificinstructionsprovidedby
the manufacturer, according to the type of fan and operation.
After carrying out any type of unscheduled maintenance operation, the start-up procedures described in chapter 5 must be repe-
ated.
7. STOP AND DRAINAGE
WARNING:
Whenhightemperaturefluidsareconveyed,thefanmustberefrigeratedoritscontentmustbemixedwithcoldairbefore•
startinganyoperation:theoperatorcouldgetburntwhentouchingpartsofthefanorwhencomingintocontactwithanyfluid
left inside
If chemicals are conveyed, which could collect at the bottom, draining plugs must be placed under the fan and the fan must •
Pag. 19