Page 1 Axial fans Warnings and instructions for use Translation from the original language  1 of 120 MVA 02 rev 5 - December 2017...
Page 2: Declaration Of Conformity
Excerpt from the Declaration of Conformity Ferrari Ventilatori Industriali S.p.A 36071 Arzignano (Vicenza) Via Marchetti, 28 Tel. +39 0444 471100 Fax +39 0444 471105 http://www.ferrariventilatori.it DECLARATION OF CONFORMITY Pursuant to Annex IIA of Machinery Directive 2006/42/EC The Manufacturer: Ferrari Ventilatori Industriali S.p.A.
Page 3: General Information
Main Index INTRODUCTION Purpose of this manual Safety symbols used in this manual Safety symbols used on fans GENERAL INFORMATION Definitions, basic principles, terminology used and correlated documents Construction details of axial fans 2.2.1 Versions and motor positions 2.2.2 Flow indications Fan identification Description of fan Envisaged use and foreseeable uses according to experience, and prohibited uses...
Page 4: Technical Charts
4.3.2 Lifting version 4 axial fans 4.3.3 Lifting version 8 axial fans 4.3.4 Lifting fans packed in crate Storage INSTALLATION General information 5.1.1 Minimum installation distances Assembly of axial fans 5.2.1 Version 4 axial fans 5.2.2 Version 1 axial fans 5.2.3 Version 9-12 axial fans 5.2.4...
Page 5 DISMANTLING AND REASSEMBLING ESSENTIAL COMPONENTS 10.1 Fan impellers with steel hub 10.1.1 Assembling impeller 10.1.2 Dismantling impeller 10.1.3 Adjusting blade angle 10.2 Fan impellers with aluminium hub 10.2.1 Assembling impeller 10.2.2 Dismantling impeller 10.2.3 Adjusting blade angle 10.3 Replacing drive belts 10.3.1 Assembling and dismantling pulleys 10.3.2...
Page 6 Index of Diagrams Fig. 2-1 Axial fan versions Fig. 2-2 Flow indications Fig. 2-3 Identification plate of fan described by this manual Fig. 2-4 Key to reading fan identification plate Fig. 2-5 Example of version 9 with fan components indicated Fig.
Page 7 Fig. 8-3 Checking drive belt tension Fig. 8-4 Axial play Fig. 8-5 Angular misalignment Fig. 8-6 Parallel misalignment Fig. 9-1 ST supports versions A – AL – B - BL Fig. 10-1 Blade angle adjustment for impellers with steel hubs. Fig.
Page 8 Index of Charts Chart 3-1 Installation types supplied and mesh guards used Chart 3-2 Fasteners fixing mesh guards Chart 3-3 Acoustic power emitted Lw(A) (dBA) Chart 3-4 Acoustic power emitted Lw(A) (dBA) Chart 3-5 Acoustic pressure emitted Lp(A) (dBA) Chart 3-6 Acoustic pressure emitted Lp(A) (dBA) Chart 5-1 Sequence of operations for assembly of version 4 fans Chart 5-2 Sequence of operations for assembly of version 1 fans Chart 5-3 Sequence of operations for assembly of version 9-12 fans...
Page 9: Purpose Of This Manual
In this manual the letters “FVI” stand for “Ferrari Ventilatori Industriali S.p.A.” No part of this manual may be copied, reproduced or transmitted in any form whatsoever and by any electronic, mechanical or photographic means without the express authorization of FVI.
Page 10 Safety symbols used on fans The following safety symbols are used on FVI fans: Prohibited to lubricate and/or adjust moving parts. Prohibited to remove guards. Hazard due to presence of moving parts. This symbol is applied near the inspection hatches provided on fans. It is permitted to open inspection hatches only when all moving parts have reached a complete standstill.
Page 11 GENERAL INFORMATION Definitions, basic principles, terminology used and correlated documents  Point 3.1 of the UNI EN ISO 13349 standard defines a fan as “rotary-bladed machine which receives mechanical energy and utilizes it by means of one or more impellers fitted with blades to maintain a continuous flow of air or other gas passing through it and whose work per unit mass does not normally exceed 25 kJ/kg.”...
Page 12 Construction details of axial fans 2.2.1 Versions and motor positions VERSION 1 VERSION 4 VERSION 8 0° 315° 45° 270° 90° 225° 135° 180° VERSION 9 VERSION 12 Standard position with motor at 0° Fig. 2-1 Axial fan versions 2.2.2 Flow indications The diagram refers to version 4, but is valid for all construction versions:...
Page 13 Fan identification The identification plate is the only means of fan identification recognized by the manufacturer. It must not be modified, and must not be removed or damaged. Fig. 2-3 shows the plate fitted to the fan. Fig. 2-3 Identification plate of fan described by this manual Blade fitting Fan size Fan series...
Page 14 Description of fan Taking the fan shown in Fig. 2-5 as an example, an axial fan is generally constituted by the following components:  an impeller that rotates to impart the necessary energy to the fluid (1);  a casing housing the impeller, with a cylindrical shape (2); ...
Page 15 Envisaged use and foreseeable uses according to experience, and prohibited uses The envisaged use for the fan with the identification plate as shown in Fig. 2-3 is as follows: An industrial axial fan is a machine that serves to move a gaseous fluid inside a fluid movement system to which the fan is connected by means of ducts and technical chambers provided for this purpose.
Page 16 Life cycle of fan The reliability of all components is guaranteed by a production process with ISO 9001 certification and by compliance with the programmed maintenance intervals indicated in paragraph 12.3 of this manual. The components normally subject to wear are the following: ...
Page 17 WARNINGS AND MAIN SAFETY INDICATIONS Installation instructions: general information Fans can be installed in four different ways, in conformity with the UNI EN ISO 13349 standard:  Type A: open intake and open exit;  Type B: open intake and exit connected to duct; ...
Page 18 With regard to guards to be fitted to ducts, in compliance with the design project, they must prevent access to parts of the fan and its accessories that could cause injuries. They must also be sufficiently robustly constructed to resist the stresses generated by the machine and environmental conditions. FVI invites users and/or system designers to design, construct and install guards in conformity with the criteria of the UNI EN ISO 12499 standard.
Page 19 Installation type A: Instructions for assembly, installation and connections In case of type A installations, since neither the intake nor exit of the fan are connected to ducts, guards must be fitted on both the intake and the exit. Guard dimensions can be obtained from the dimensional drawing given in catalogues, from scale and non- scale drawing programs downloadable from the reserved area of the website, or from any dimensional drawings provided as documentation together with the products supplied.
Page 20 Installation type supplied Impeller Intake Exit guard according to Series Flow guard (mesh) material (mesh) UNI EN ISO 13349 aluminium aluminium aluminium aluminium (version B) aluminium aluminium aluminium aluminium (version A) steel steel (version A) steel steel (version B) steel Chart 3-1 Installation types supplied and mesh guards used (grey backgrounds show guards that depending on the installation type supplied constitute part of the fan itself)
Page 21 Fig. 3-1 RC mesh guard Fig. 3-2 RG mesh guard Fig. 3-3 RS mesh guard Fig. 3-4 RD mesh guard  21 of 120 MVA 02 rev 5 - December 2017...
Page 22 Fig. 3-5 RE mesh guard Fig. 3-6 RT mesh guard Installation type B: Instructions for assembly, installation and connections In case of type B installations, since the fan intake is free and the exit is connected to a duct, a guard must be fitted on the intake.
Page 23 Installation type C: Instructions for assembly, installation and connections In case of type C installations, since the fan intake is connected to a duct and the exit is free, a guard must be fitted on the exit. Guard dimensions can be obtained from the dimensional drawings given in catalogues, from scale and non- scale drawing programs downloadable from the reserved area of the website, or from any dimensional drawings provided as documentation together with the products supplied.
Page 24 Assembly and fastener diagrams for fixing guards According to fan size, guards are bolted onto the fan as shown in Fig. 3-7, Fig. 3-8, Fig. 3-9, Fig. 3-10, Fig. 3-11 and Fig. 3-12. The fasteners necessary for assembly are shown in Chart 3-2. Fan size RC mesh RG mesh...
Page 25 Fan structure RC mesh Flanged nut Bolt Ferrari washer Fig. 3-7 Assembly diagram for RC mesh Fan structure RG mesh Flanged nut Ferrari washer Bolt Fig. 3-8 Assembly diagram for RG mesh  25 of 120 MVA 02 rev 5 - December 2017...
Page 26 RS mesh Fan structure Bolt Flanged nut Ferrari washer Fig. 3-9 Assembly diagram for RS mesh Flat washer Flanged nut RD mesh Fan structure Bolt Fig. 3-10 Assembly diagram for RD mesh  26 of 120 MVA 02 rev 5 - December 2017...
Page 27 Fan structure RE mesh Flanged nut Ferrari washer Bolt Fig. 3-11 Assembly diagram for RE mesh Fig. 3-12 Assembly diagram for RT mesh  27 of 120 MVA 02 rev 5 - December 2017...
Page 28 Installation type D: Instructions for assembly, installation and connections In case of type D installations, since both the fan intake and exit are connected to ducts, no guards need to be installed on either the intake or exit of the fan. CAUTION: The system designer must assess the need to fit any necessary guards at the intake and exit ends of the system.
Page 29 Risks involved in foreseeable incorrect handling and/or abnormal uses based on experience  When moving, lifting and installing the fan, always follow the instructions provided in this manual.  It is absolutely prohibited to use the fan in conditions other than those indicated by the data on the identification plate.
Page 30 Other risks related to fans pursuant to UNI EN ISO 12499 The specific risks defined below are those deriving from mechanical aspects of the fan. A person may be injured as a result of: a) being dragged between a moving part and a fixed part, for example a impeller and the casing or some other fixed part of the fan;...
Page 31 CAUTION: IT IS ABSOLUTELY PROHIBITED TO:  Carry out any type of maintenance operation without having first checked that the fan impeller is effectively at a standstill.  Proceed with any type of maintenance operation on the fan (including lubrication) without having first disconnected it from the mains powers supply.
Page 32 If ignored, vibrations can:  cause the formation of cracks serious enough to cause structural failure, which may even be sudden  cause difficult operating conditions for bearings, with malfunctions that may even include seizing (with dangerous overheating effects)  cause slackening of tightening and fixing components (nuts and bolts) ...
Page 33 CAUTION: To construct the entire transmission and/or install the motor only, the user and/or installer must always request the transmission specifications document. It is absolutely prohibited to construct transmissions with the use of couplings, drive belts and pulleys of types other than those indicated by the transmission specifications document.
Page 34 CAUTION: Fan operation within a very broad range of operating speeds may lead to increased vibration in correspondence with a specific resonance frequency of the system of which the fan is only a single component. Avoid working at speeds coinciding with structural resonance frequencies, and if this is not possible, modify some variable that can change the resonance frequency of the system, for example by using vibration dampers of a different type.
Page 35 CAUTION: Vibrations and noise emission are directly correlated. Compliance with the instructions given for correct installation so as to reduce vibrations to a minimum is of equivalent importance for noise reduction. Since the noise emitted by a fan can be influenced by external factors that can affect the overall noise level, such as: ...
Page 36 3.8.7 General information on noise emission data Level of acoustic power – LwA This is the average value of acoustic power expressed in dBA (value weighted according to scale A) emitted into the environment by a fan with ducting on both the intake and exit sides. The value refers to channelled air with a density of 1.226 kg/m , at the maximum permitted rotation speed of the impeller and with operation at the optimum point on the curve.
Page 37 MICROPHONE POSITION Measurements external to ducts Fig. 3-13 Positions of measurement microphones Reference standards EN ISO 3744 - Determination of sound power levels of noise sources using sound pressure (engineering method in an essentially free field over a reflecting plane). EN ISO 3746 - Determination of sound power levels of noise sources using sound pressure (survey method using an enveloping measurement surface over a reflecting plane).
Page 38 ACOUSTIC POWER* EMITTED Lw(A) (dBA) (1/2) Axial fans – series with aluminium impeller hub size vers.9 1000 1120 1250 1400 * Uncertainty + 3 dB Chart 3-3 Acoustic power emitted Lw(A) (dBA)  38 of 120 MVA 02 rev 5 - December 2017...
Page 39 ACOUSTIC POWER* EMITTED Lw(A) (dBA) (2/2) Axial fans – series with steel impeller EF/H size ES/H EF/H vers.9- EB/H EFR/P 1000 1120 1250 1400 1600 1800 2000 * Uncertainty + 3 dB Chart 3-4 Acoustic power emitted Lw(A) (dBA) ducted only on exit ducted only on exit and at maximum synchronism speed ducted only on intake and at maximum synchronism speed ...
Page 40 ACOUSTIC PRESSURE* EMITTED Lp(A) (dBA) (1/2) Axial fans – series with aluminium impeller hub size vers.9 1000 1120 1250 1400 * Uncertainty + 3 dB Chart 3-5 Acoustic pressure emitted Lp(A) (dBA)  40 of 120 MVA 02 rev 5 - December 2017...
Page 41 ACOUSTIC PRESSURE* EMITTED Lp(A) (dBA) (2/2) Axial fans – series with steel impeller hub EF/H size ES/H EF/H vers.9- EB/H EFR/P 1000 1120 1250 1400 1600 1800 2000 * Uncertainty + 3 dB Chart 3-6 Acoustic pressure emitted Lp(A) (dBA) ducted only on exit ducted only on exit and at maximum synchronism speed ducted only on intake and at maximum synchronism speed...
Page 42 TRANSPORT, MOVEMENT AND STORAGE Lifting and movement operations with the fan may create hazardous situations for exposed persons. It is therefore advisable to follow the instructions provided by FVI and to use suitable equipment. Lifting and movement It is advisable to carry out all lifting and movement operations on the fan and its components with extreme care, avoiding impacts that may affect its correct operation or damage covered parts.
Page 43 Fan lifting instructions 4.3.1 Lifting version 1-9-12 axial fans Lifting operations must be carried out by qualified personnel, suitably trained in the use of the equipment and equipped with the correct PPE for protection against blows and/or falling objects. Version 1 fans are supplied without motor.
Page 44 Fig. 4-2 Example of lifting version 9 EF axial fans Fig. 4-3 Example of lifting version 9 EB axial fans Fig. 4-4 Example of lifting version 12 axial fans  44 of 120 MVA 02 rev 5 - December 2017...
Page 45 4.3.2 Lifting version 4 axial fans Version 4 fans have the impeller fitted directly on top the motor shaft, and to lift them only the holes provided in the structure must be used (as shown in Fig. 4-5). These holes are located on opposite sides above the centre of gravity, and are indicated by specific symbols.
Page 46 Fig. 4-7 Example of lifting version 4 B EF axial fans CAUTION: The lifting lugs on motors must never be used to lift the fan. 4.3.3 Lifting version 8 axial fans The motor turns the impeller on version 8 fans by means of a flexible or a toothed coupling. To lift these fans only the specific holes provided in the structure must be used (as shown in Fig.
Page 47 4.3.4 Lifting fans packed in crate The weight and centre of gravity of the crate are indicated on the outside of the package. The lifting points for lifting the crate with a forklift truck are identified by two black triangles with the tip pointing downwards.
Page 48 Fig. 4-9 Example of lifting fans packed in crate Storage If the fan is to be stored, it must be protected against weather conditions and damp, dust and the effects of atmospheric and environmental agents. CAUTION: Close intake and exit openings during storage. It is advisable to periodically check the satisfactory state of conservation of the fan, and to manually rotate the impeller about once a month to prevent deformations to bearings.
Page 49: Installation
INSTALLATION General information CAUTION: All assembly operations must be carried out only by qualified personnel, equipped with the correct PPE for protection against blows and/or falling objects. Generally, special or specific equipment is not necessary for the assembly of fan parts. In the case of assembly of parts requiring a specific procedure, FVI will provide the additional information necessary for carrying out the operations correctly.
Page 50 Ducting connected to the fan must be supported separately, and must be coaxial with respect to the intake and exit openings, so as to prevent deformation caused by the tightening of nuts and bolts. CAUTION: All installation operations must be carried out only by qualified personnel, authorized, using suitable equipment and equipped with the correct PPE for protection against blows and/or falling objects.
Page 51 Fig. 5-2 Minimum installation distances with free intake Assembly of axial fans The main steps of the assembly of axial fans in the various versions supplied are illustrated below. 5.2.1 Version 4 axial fans Fig. 5-3 Assembly of version 4 axial fans ...
Page 52 Step Operation Description Positioning of motor [1] The motor must be positioned on its base without fully tightening its fixing fasteners. Fitting of impeller [2] on motor shaft IMPORTANT: If necessary, reduce the diameter of the motor shaft until its nominal size is reached with a tolerance of +0/+5 microns.
Page 53 Step Operation Description Positioning of support [1] The support must be positioned on its base without fully tightening its fixing fasteners. Fitting of impeller [2] on support IMPORTANT: If necessary, reduce the diameter of the motor shaft until its nominal size is reached with a tolerance of +0/+5 microns. Assembly with excessive play can cause vibrations.
Page 54 After completing steps 1-2-3 indicated in paragraph 5.2.2, proceed with the installation of the transmission. Step Operation Description Installation of casing Position the casing on the base [5] (only for version 12) Installation of motor [1] Position the motor on its base [2] complete with stays (version 9) or on the slides [2] of the base (version 12), without fully tightening fasteners.
Page 55: Electrical Connections
Installing and adjusting drive belts and final checks If the fan is fitted with a V-belt drive, the transmission is assembled as follows:  Carefully clean tapered parts and the bush hole before fitting it onto the pulley.  Fit the bush onto the pulley, taking care to align the threaded half-holes on the pulley with the unthreaded half-holes on the bush.
Page 56 Make the connection to the grounding connector before making all other connections. Check that the connection layout (see Fig. ) is suitable for the power supply voltage. Standard electric motors can normally operate indifferently in both rotation directions. To invert the rotation direction, it is sufficient to exchange any two of the power supply cables directly on the terminal board.
Page 57 (grommets). In this case, consult the FVI Technical Office. These precautions are applicable in particular if an external terminal box is fitted (EF series: see fig. 5 – 8). On EFR series fans, the external terminal box is already provided by FVI.
Page 58 If possible in the available space, to guarantee correct entry of the fluid into the intake opening it is advisable on fans connected to ducting to leave a straight section of duct with a length about 2.5 times the fan size (given on the identification plate).
Page 59 CHECKS TO BE MADE BEFORE AND AFTER STARTING Preliminary checks and first starting of the machine CAUTION: Preliminary checks before the first starting must be made only with the fan at a standstill and disconnected from electrical power supplies. Before the fan is started for the first time a number of preliminary checks are necessary: ...
Page 60 Checks to be made with fan fully operating Check that power absorption does not exceed the value indicated on the motor identification plate. If it does, immediately halt the fan and contact the manufacturer. Fan operation must be free from excessive vibrations and abnormal noise. With the fan at a standstill, check that the temperature of the bearings does not exceed the limits of tolerance (with an ambient temperature of 20°C, the temperature of supports must be no higher than 70°C).
Page 61 For guards in pressed and painted sheet metal, checks must be made for the following:  Corrosion or dullness of painted surfaces  Detachment of rivets/welds  Evidence of noises typical of loose guards  Impacts and permanent deformation of components ...
Page 62 6.2.4 Dimensional checks CHECKLIST – DIMENSIONAL CHECKS ON COMPONENTS COMPONENTS TO TYPE OF CRITERIA FOR RESULT CHECK CHECK/INSTRUMENT ACCEPTABILITY Impeller: presence of scratches or grooves on Visual Undamaged surfaces Reduction of thickness no Casing: sheeting Dimension/Caliper greater than 10% in an thickness equivalent area without wear...
Page 63 AXIAL FAN OPERATING MALFUNCTIONS Most frequent malfunctions The following chart lists the main problems that may be encountered: PROBLEM CAUSE SOLUTION Check that motor and/or command inverter to the electrical No electrical connection power supply line and is correctly powered Check internal connections and motor Motor malfunction Fan does not start...
Page 64 PROBLEM CAUSE SOLUTION See previous point “Pulsating Pulsating operation operation” Use the inverter to avoid operation at Structural resonance at specific these speeds or modify frequencies of rotation speeds the overall system Wear on impeller parts Inspect the impeller Deposit of material on impeller Inspect the impeller Vibrations Check for correct coupling between...
Page 65 MAINTENANCE Read this section carefully before carrying out maintenance operations on the fan. This will ensure greater conditions of safety for maintenance personnel and greater reliability of the work done. The safety rules to be respected during maintenance operations on the fan are as follows: ...
Page 66 Bearing lubrication Both type SN and type ST supports assembled by Ferrari already contain the correct quantity of lubricant, as indicated in Chart 8-1. No lubricant filling operations are therefore required during installation.
Page 67 Support type Quantity of grease for first filling (g) SN 507 … SN 508 … SN 509 … SN 510 … SN 511 … SN 512 … SN 513 … SN 516 … SN 517 … SN 518 … SN 520 … SN 522 …...
Page 68 Rotation speed (RPM) Rotation speed (RPM) Grease Bearing type Grease Bearing type 1060 1500 2120 3000 4250 1060 1500 2120 3000 4250 Support type quantity (side opposite quantity (pulley side) (grams) pulley) (grams) Relubrication intervals in hours Relubrication intervals in hours ST 47 A-AL 6204 Z 12500...
Page 69 Checking spherical roller bearings Before fitting the bearing, the internal radial clearance above the roller located in the highest position must be checked with a feeler gauge (see Fig. 8-1 Checking radial clearance on bearings). During fitting, check the reduction of internal clearance beneath the lowest roller several times. Correct fitting is obtained with a reduction of internal clearance and minimum residual clearance corresponding to the indications given in Chart 8-3 Checking radial clearance on bearings Radial clearance...
Page 70 Checking self-aligning ball bearings Correct fitting is obtained with a tightening angle, axial movement and minimum residual clearance corresponding to the indications of Chart 8-4. Self-aligning ball Tightening angle Axial movement s Minimum residual clearance after fitting bearing (degrees)* (mm) (mm) Normal clearance C3 clearance...
Page 71 Adjusting drive belt tension and cleaning belts A simplified method for setting the correct tension of V-belts is as follows: Chart 8-5 can be used to obtain the value P of the load for each belt for the profile type and the diameter of the smaller pulley. The value L can also be obtained from the same chart.
Page 72: Flexible Couplings
Check drive belt tension at least after about the first 8 hours of operation, and then follow the indications given for programmed maintenance (see paragraph 12.3). Completely replace belts when worn to a degree that affects satisfactory operation of the transmission due to an insufficient value of pre-tension or if slipping is more than 4-5%.
Page 73 Type S min R max Max speed Lubricant [kg] Recommended installation operation [rpm] lubricant [mm] [mm] max. [mm] max. [mm] 0.15 0.15 0.15 5000 0.20 0.20 0.20 5000 BT10 0.20 0.20 0.20 5000 BT15 0.20 0.20 0.20 5000 BT22 0.20 0.20 0.20 5000...
Page 74 Filters and pressure gauges If the fan is fitted with filters for the intake fluid, these must be periodically cleaned so as to prevent increases of load loss at the intake, which would reduce fan performance. Checks and any necessary cleaning operations must be carried out at predetermined intervals. It is however advisable to use a differential pressure gauge to monitor the pressure gap caused by the filter.
Page 75 TECHNICAL CHARTS ST supports versions A – AL – B - BL Cooling fan VENTOLINA DI RAFF. PER TEMP. for air temps.  Vers. AL-BL ESEC. AL-BL ARIA 60 300 °C 60÷300°C ØS ØD Greaser INGRASSATORE UNI 7663 type A UNI 7663 TIPO A ESEC.
Page 76 Standard supports and bearings installed on fans with transmission BEARINGS BEARINGS SUPPORT for EF series SIZE for EB series (cannot be greased) 314/l 354/H ST 47 A 19 6204-2RSH 6204-Z (clearance C3) 404/G 454/H 504/G ST 62 A 24 6305-2RS1...
Page 77 DISMANTLING AND REASSEMBLING ESSENTIAL COMPONENTS CAUTION: All dismantling and reassembly operations indicated below must be carried out only by qualified and authorized personnel, equipped with the necessary PPE. CAUTION: All dismantling and reassembly operations described below must be carried out: ...
Page 78 Photo 2 Photo 3 2.- Fit the tapered bush (6) between the impeller hole and the motor shaft (Photo 4): given that the hub hole and the external bush surface are tapered (the smaller diameter is on the motor side), the bush can be fitted only in one direction.
Page 79 Photo 5 CAUTION: Ensure that the bush is pushed home until it rests against the stop on the motor shaft. The hub sleeve has a notch (8) that after assembly must be aligned with the axial slit in the bush (9) (Photo 6).
Page 80 Photo 8 4.- Fix the central bolt onto the motor shaft: fit the impeller fixing screw (12) with relative spring washer into the central unthreaded hole in the disk and fix it onto the motor shaft (Photo 9). Tighten the bolt until the tightening torque indicated in Chart 12.1 is reached.
Page 81 10.1.2 Dismantling impeller 1.- Unscrew the two hub fixing bolts (Photo 10). Photo 10 2.- Removing the impeller: for this operation, use the two fixing bolts of the hub just dismantled (two additional identical bolts can also be used if available).
Page 82 Photo 13 Secure the impeller with suitable lifting equipment (Photo 14). Photo 14  82 of 120 MVA 02 rev 5 - December 2017...
Page 83 4.- Unscrew the impeller fixing bolt and remove the disk (Photos 15 and 16). Photo 15 Photo 16 5.- Extract the bush (Photo 17): to make this operation easier, insert a suitable tool into the bush slit. Photo 17  83 of 120 MVA 02 rev 5 - December 2017...
Page 84 6.- Lift and remove the impeller (Photo 18): when carrying out this operation, take care not to damage or deform the impeller blades. Photo 18 10.1.3 Adjusting blade angle Blade angle adjustments may alter impeller balance. It is therefore advisable to check impeller balance after adjusting blade angles, to prevent any abnormal vibration due to blade angle adjustment.
Page 85 10.2 Fan impellers with aluminium hub CAUTION: The impeller must be moved with care, avoiding impacts that could alter its balance or deform 10.2.1 Assembling impeller CAUTION: The impeller hub may have a circumferential extraction groove (Fig. 10-2) or threaded extraction holes (Fig.
Page 86 1.- If necessary, reduce the diameter of the motor shaft until its nominal size is reached with a tolerance of +0/+5 microns. Keeping the impeller raised with suitable lifting equipment, move it towards the motor and fit the motor shaft (Photo 19) into the hole in the hub bush.
Page 87 3.- Fit a threaded rod with washer, spacer and nut into the hole in the impeller sleeve and screw it onto the motor shaft (Photo 22). Use the correct spanner to tighten the nut until the impeller fits into place, resting against the stop on the motor shaft (Photo 23).
Page 88 5.- Fit the impeller fixing bolt and the relative spring washer into the central unthreaded hole of the disk and fix it to the motor shaft (Photo 25). Fixing screw Spring washer Disk Photo 25 6.- Tighten the bolt until the tightening torque indicated in Chart 12.1 is reached (Photo 26).
Page 89 10.2.2 Dismantling impeller 1.- Support the impeller with suitable lifting equipment. 2.- Hub with circumferential extraction groove: remove the central impeller fixing bolt (Photo 28). Hub with threaded extraction holes: partially unscrew the central fixing bolt. Photo 28 3.- Hub with circumferential extraction groove: position the tip of the threaded rod of the extractor and hook the grips onto the extraction groove of the impeller hub (Photo 29a).
Page 90 4.- On both hub types, turn the extractor handle to detach the impeller (Photo 30 – for reasons of simplicity only the impeller with an extraction groove is shown). Photo 30 5.- Lift and remove the impeller, after removing the fixing bolts in the case of the hub with threaded extraction holes.
Page 91: Replacing Drive Belts
Blade Hub assembly Fixing bolt Fixing nut Fig. 10-4 Locking blades 10.3 Replacing drive belts 10.3.1 Assembling and dismantling pulleys 1.- Check that the motor shaft and the transmission shaft are parallel. 2.- Before fitting the bush (Photo 32) into the pulley, carefully clean tapered parts and the bush hole.
Page 92 3.- Fit the bush into the hole in the pulley, taking care to align the threaded half-holes on the pulley with the unthreaded half-holes on the bush (Photo 32). There may be 2 or 3 of these holes (Fig. 10-5), as can also be seen in Chart 9.1, depending on pulley size.
Page 93 6.- Fit the assembled bush, grubscrews and pulley onto the motor shaft with the spline inserted in the corresponding slot in the bush hole. If necessary, widen the bush hole by inserting a suitable tool into the bush slit (Photos 35 and 36). Photo 35 Photo 36 7.- Always check that there is a minimum of...
Page 94 9.- Use a straight edge of a suitable length to check correct alignment of the pulleys (Photo 38). Use a rubber hammer to move pulleys axially until the parallel misalignment has been corrected (Photo 39). Photo 38 Photo 39 10.- Adjust Variation Variation...
Page 95 12.- Check correct pulley alignment again. CAUTION: Incorrect alignment causes excessive wear and greater friction on drive belts, higher power absorption by the transmission, noise and vibrations that reduce the effective lifespan of the transmission. Generally, the tolerance in pulley alignment in V-belt drive transmissions may not be greater than 0.5 degrees or 5 mm for each 500 mm of distance between centres (Figs.
Page 96 10.3.2 Assembling and dismantling drive belts 1.- After checking correct pulley alignment, fit the belts. Tools should not be used to force the belts into place on the pulleys (Photos 41, 42 and 43). If necessary, reduce the distance between pulley centres by moving the motor closer.
Page 97 For version 9 fans (motor supported on the side of the motor pedestal), use the stays to move the motor base (Photo 44). Stay Photo 44 For version 12 fans, (with motor resting on base), slightly slacken the motor fixing bolts on the motor base and adjust the stays on the sides to move the motor.
Page 98 10.4 Replacing shaft and bearings on one-piece support 10.4.1 Dismantling shaft on one-piece support CAUTION: All the operations described below must be carried out in a perfectly clean environment, also avoiding introducing any source of contamination inside the support. FVI one-piece supports for fans with transmission (Photo 46) can be of two types, according to the type of bearing fitted on the pulley side or the coupling side (LP transmission side):...
Page 99 Pulley side Impeller side Type ST…B… support (LP) (LG) Ball/roller bearings Fig. 10-9 ST…B… one-piece support with radial ball bearings on impeller side and roller bearings on transmission side On Type ST…B… supports, the shaft must be extracted from the impeller side. On Type ST…A… supports, the shaft can be extracted from both sides.
Page 100 2.- Remove the two VA sealing rings located between the shaft and the two support end covers (Photo 47). Photo 47 3.- Remove the fixing bolts and the cover on the impeller side (Photo 48). Photo 48 4.- Extract the shaft. For Type ST…A…...
Page 101 For Type ST…B… supports, extract the shaft only partially, resting it in an intermediate position (Photo 50). Photo 50 5.- With the shaft still partially inside the support, remove the spring locking ring located in the support from the impeller side, using suitable pliers (Photo 51).
Page 102 7.- Remove the bolts and the cover on the pulley side (Photo 53). Photo 53 8.- Extract remaining components (casing, rollers and external ring) of the roller bearing (Photo 54). Photo 54 9.- Remove the spring locking ring located on the transmission side of the support, using suitable pliers (Photo 55).
Page 103 10.4.2 Reassembling shaft on one-piece support All the operations described below must be carried out in a perfectly clean environment, also avoiding introducing any source of contamination inside the support. 10.4.2.1 Type ST… A… supports 1.- Fit the two ball bearings onto the transmission shaft from both sides (Photo 56).
Page 104 4.- Bolt on the covers at both ends of the support (Photo 58). Photo 58 5.- Insert the two VA sealing rings between the shaft and the support end covers (Photo 59). Photo 59 10.4.2.2 Type ST…B… supports 1.- Fit the grease sealing ring up to the stop on the shaft from the transmission side (Photo 55).
Page 105 2.- Fit the spring locking ring (to be fixed inside the support) onto the shaft from the impeller side. The ring will be suspended from the shaft, but is not fixed (Photo 61). Photo 61 3.- Fit the ball bearing onto the shaft from the impeller side, and secure it axially using the spring locking ring (Photo 62).
Page 106 5.- Fix the spring locking ring into the recess in the support from the transmission side (Photo 64) Photo 64 6.- Partially insert the shaft, complete with all components fitted, into the support. The shaft must be fitted from the impeller side, first inserting the end of the shaft with the internal ring of the roller bearing and the grease sealing ring (Photo 65).
Page 107 8.- Fully insert the shaft (Photo 67). Photo 67 9.- From the transmission side, insert the remaining roller bearing components: casing, rollers and external ring (Photo 68). Photo 68 10.- Grease the bearings using the type of grease recommended in paragraph 8.1, filling the bearing completely but the free space of the housing only partially (Photo 69).
Page 108 11.- Bolt on the covers at both ends of the support (Photo 70). Photo 70 12.- Insert the two VA sealing rings between the shaft and the support end covers (Photo 71). Photo 71  108 of 120 MVA 02 rev 5 - December 2017...
Page 109 11 FINAL DISMANTLING AND DISPOSAL OF FANS At the end of the life cycle of the fan, the machine and its accessories must be dismantled as indicated below, so as to allow the various components to be disposed of differently according to the type of material from which they are made.
Page 110 CAUTION: Regardless of the installation type, all components connected to the fan flange must be disconnected and removed before proceeding. Fan series Blade material Hub material Hub sleeve EF, ES, EB, EFR, ESR, EQ, EK, ET Aluminium Aluminium EF, ES, EB, EFR, ESR … /H o …/K Aluminium Steel Cast iron...
Page 111 11.2 Version 1-9 axial fans Fig. 11-2 Exploded view of version 9 fan With reference to Fig. 11-2, the correct dismantling sequence for version 9 fans is as follows:  Guards (1)  Intake (2) (if present)  Transmission components (3) (paragraph 10.3) ...
Page 112 11.3 Version 12 axial fans Fig. 11-3 Exploded view of version 12 fan With reference to Fig. 11-3, the correct dismantling sequence for version 12 fans is as follows:  Guards (1)  Intake (2) (if present)  Transmission components (3) (paragraph 10.3) ...
Page 113: Technical Appendices
12 TECHNICAL APPENDICES 12.1 Tightening torques for nuts and bolts Tightening torques M of the chart 12-1 are valid under the following conditions:  Type UNI 5737 bolts with hexagonal heads, type UNI 5931 and UNI 6107 screws with cylindrical head, in normal conditions of supply.
Page 114 Tightening torques valid for fixing bolts with 12.9 resistance class for aluminium blades on fans with steel hub Bolt Torque (Nm) Torque must be checked with a torque wrench. Do not use galvanized nuts or bolts. Chart 12-2 Tightening torques for blade fixing bolts on fans with steel hub ...
Page 115 12.2 Checklist before starting fans The checks listed below are necessary, but could be insufficient in environments with particular types of risk. CHECKLIST BEFORE STARTING FANS CODE SERIAL NUMBER YEAR Identify installation type in accordance with paragraph 3.1. Check compatibility of fan with type of application. Check that the fan and motor identification plate data are compatible with the data on the transmission information card (if present).
Page 116 12.3 Programmed maintenance intervals The intervals of time suggested constitute a working basis for the customer, who must according to circumstances make any modifications necessary for the specific operating conditions. Programmed maintenance intervals according to intensity of use Intensity of use High Medium For all fans...
Page 117 12.4 Energy efficiency measurement system The energy efficiency of the fan in accordance with Directive 2009/125/EU – Regulation (EU) 327/2011 must be calculated by carrying out a performance trial on the machine in conformity with the ISO 5801 standard. The measurement must be made with an intake chamber following the layout below (type e installation – measurement with multi-nozzle chamber pursuant to point 30 of the UNI EN ISO 5801 standard): ...
Page 118 13 INDEX abrasion; 62 covers; 102; 104; 106; 110 accessories; 13; 17; 28; 35; 111; 118 cycle; 15; 30; 31; 33; 63; 111 acoustics; 7; 10; 34; 37; 38; 39; 40 life cycle; 15; 31; 33; 111 air; 10; 14; 17; 29; 30; 35; 58; 65; 66 diameter;...
Page 119 identification plate; 1; 6; 10; 12; 14; 28; 49; 56; 59; 60; power supply; 30; 32; 56; 66; 67; 117 61; 65; 69; 77; 117 voltage; 56; 65 imbalance; 66 power; 10; 32; 34; 35; 56; 65; 87; 92; 97 impeller;...
Page 120 speed; 3; 6; 10; 15; 29; 31; 32; 33; 35; 38; 40; 46; 57; 61; 65; 66 nominal; 33 spline; 88; 94; 95 standards; 30; 34; 56; 119 steel; 5; 7; 10; 19; 33; 38; 40; 80; 87; 111; 116 stainless steel;...

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