Centrimaster, GX Installation and Maintenance Instructions

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1 Centrimaster, GX Installation and Maintenance Instructions

2 Centrimaster, GX Installation General Receiving and inspecting the product Inspection Data on the rating plate Handling and lifting the fan Weight of the products Storing the fan Function and design of the fan Design Operating conditions Balancing Bearings Type of bearings according to the fan type and size Max. permissible belt force on the fan shaft Useful life of bearings Free access to the fan Installation and commissioning Installation of the fan Fitting the accessories How not to install the fan Inspection after the fan has been installed Measures to be taken prior to commissioning Commissioning Service Warranty Maintenance plan Before maintenance Checking the bearings Impeller Casing Inspecting the bearings Permanently lubricated bearings Plummer blocks with ball bearings Plummer blocks with roller bearings Recommended lubricants Maintenance Bearing types and design Replacing the bearings Dismantling the ball bearing with eccentric locking collar ( bearing) Mounting the ball bearing with eccentric locking collar ( bearing) Dismantling the permanently lubricated ball bearing with conical adapter sleeve (S-bearing) Mounting the permanently lubricated ball bearing with conical adapter sleeve (S-bearing) Dismantling the plummer block with roller bearing Mounting the plummer block with roller bearing Dismantling the plummer block with ball bearing Mounting the plummer block with ball bearing Impeller Removing the impeller (sizes ) Mounting the impeller (sizes ) Removing the impeller (sizes ) Mounting the impeller (sizes ) Mounting an impeller with backward-curved blades (type and ) and the inlet cone Final examination Trouble-shooting Scrapping the fan General These instructions are intended for use by professional service staff. Professional staff who is familiar with the safety regulations must carry out the installation, commissioning and operation of the fans. Tools and protective equipment necessary for preventing accidents from occurring while installing and operating the fan must be used in accordance with the local safety norms. 1. Receiving and inspecting the product 1.1 Inspection Check the fan immediately after you receive it and make sure that it has not been damaged during transport. If you discover any damage, get in touch with the Transportation Company without delay. Briefly rotate the fan shaft to make sure that it rotates easily. Check the information on the fan rating plate. 1.2 Data on the rating plate Ref: Fläkt Woods order number Marking: Position number (specified by the customer) Type: Fan type Mfd: The year when the fan was manufactured Max speed: Maximum permissible fan speed Max. temp: Maximum permissible operating temperature of the fan Weight: Weight of the fan Serie: Serial number Fläkt Woods Oy 1.3 Handling and lifting the fan The smaller fans are supplied in a carton, whereas the larger fans are supplied in a wooden crate or on a pallet, which can be handled by a forklift truck. Illustration 1.1 Types of fan packaging Version Fläkt Woods Oy 2

3 Installation Centrimaster, GX Always place the fans on a level surface. Never stack fans that have been removed from their carton on top of one another. If the fan is equipped with lifting lugs, they must be used when lifting the fan. 2. Function and design of the fan The fan is used to generate a desired air volume at a given pressure rise that corresponds to the pressure losses in the duct system, to which the fan is connected. This is achieved by means of rotating the fan impeller. 2.1 Design 1. Casing 2. Cut-off plate 3. Impeller (hub in the middle) 4. Shaft 5. Inlet cone (only in type and fans) 6. Bearings and bearing brackets 7. Flange 8. Frame Illustration 1.2 The fan should be lifted by means of its lifting lugs. If it lacks lifting lugs, the fan may be lifted by means of a rope secured to the shaft ends. Do not jerk the fan as you lift it 1.4 Weight of the products Approximate weights of the standard fans are tabulated in Table 1.1. The exact weight of the relevant fan is specified on its rating plate. 1.5 Storing the fan The fans are protected in such a manner that they will be able to withstand storage for 1 month, provided that they are not exposed to direct rain or snowfall. Permissible storage temperature: C The bearings must not be exposed to vibrations from the surroundings. We recommend rotating the fan impeller once a week to redistribute the lubricant evenly along the bearing races. This will prevent spot corrosion on the rolling surfaces of the bearing. Illustration 2.1 Structural parts of the fan 2.2 Operating conditions CENTRIMASTER fans are designed for use in comfort ventilation applications. If the air contains explosive gases, check from case to case whether the fan can be used in the relevant application. The spark-proof version (inlet cone made of brass or lined with brass) will prevent sparking in the event that the impeller comes in contact with the inlet cone (e.g. in the case of bearing damage). The standard operating temperature of the fan is C. Under normal operating conditions, the sound power level will exceed 70 db (A). For detailed particulars, see the fan catalogue. Specifications are subject to alteration The storage time can be extended to 6 months, provided that the fans are stored in premises, which are adequately ventilated and heated so that no condensation will occur on the fans. Table 1.1 Weight of fans including the packaging (approx. 10%) Impeller type 014 LF Balancing The fan impellers are statically and dynamically balanced to an accuracy of G 2.5 (sizes 035 through 100) or G 6.3 (sizes 014 through 031)

4 Centrimaster, GX Installation 2.4 Bearings Type of bearings according to the fan type and size Illustration 2.2 Permanently lubricated ball bearing with eccentric locking collar ( bearing) Illustration 2.3 Permanently lubricated ball bearing with conical adapter sleeve (KH) Max. permissible belt force on the fan shaft The type and size of the bearings determines the max. permissible belt force. This figure is vital in the selection of a belt drive. The values tabulated in Table 2.2 and 2.4 presuppose only the radial force. The radial force, F r, is assumed to be exerted on the shaft end Useful life of bearings The nominal useful service life of the bearings L 10 is specified to ISO 281, Part 1. The normal useful service life of the bearings of the various CENTRIMASTER fans is tabulated in Table 2.5. The useful service life of the bearings is conditional on the bearing load, fan speed and operating temperature. 2.5 Free access to the fan A free access space must be provided on both sides of the fan or the fan must be withdrawable from the air handling unit or the plant room to enable the bearings to be changed. In fan sizes the impeller can be removed from the fan outlet and in fan sizes from the fan inlet (for cleaning or balancing, for instance). F r Illustration 2.4 Plummer block with ball bearing Illustration 2.6 Radial force F r llustration 2.5 Plummer block with roller bearing (PL) Table 2.1 Types of bearings Impeller type 014 LF D 016 D 018 D 020 S S 040 S 045 S 050 S 056 H 063 H 071 H 080 B B H 090 B B H 100 B H Table 2.2 Max. permissible radial force, F r, applied to the fan shaft, standard bearings Impeller type 014 LF Table 2.3. Types of bearing, accessories GTLZ-06/07/08/09/16/17 Impeller type 014 LF S S 025 S S 028 S S 031 S S 035 S S S 040 S S S S S S S S S H H H H H H Version Fläkt Woods Oy 4

5 Installation Centrimaster, GX Table 2.4. Max. permissible radial force, F r, applied to the fan shaft, bearings type GTLZ-06/07/08/09/16/17 Impeller type 014 LF Table 2.5 Useful life of bearings, L 10 Impeller type 014 LF Installation and commissioning 3.1 Installation of the fan The fan is secured to a base by bolts in mounting holes. The base must be level and stable. The base must be designed in such a way that vibrations caused by resonance can be avoided. During the installation, guarantee that no bending force or mechanical stress will affect the fan. The fan or the base is mounted on anti-vibration mountings. 3.2 Fitting the accessories The fan should normally be connected to the ducting by means of a flexible duct. The tightness of the flexible duct must be adequate and there must be no bends that could throttle the air flow. Check that the flexible duct is in alignment with the fan outlet and the ducting. Before connecting the flexible duct to a counter flange, fit a gasket (2 x 10 mm, for instance) to one flange. Assemble the flanged joint by means of bolts, nuts and washers and beginning at the corners of the flange. Then tighten the remaining bolts. 3.3 How not to install the fan The fan must not be mounted with the shaft vertical. Illustration 3.2 Mechanical stress exerted by improper mounting can distort the fan casing. Correct alignment is vital for preventing bearing damage and vibrations. 3.4 Inspection after the fan has been installed Rotate the shaft and check that the impeller can move freely and that it does not come in contact with the inlet cone. Also check that there is no unusual noise from the bearings. Make sure that there are no foreign objects in the fan or in the ducting. Check that the Specifications are subject to alteration Illustration 3.1 Fan with the shaft vertical The fan must not be mounted with the casing slanted. 3.5 Measures to be taken prior to commissioning If the fan has an impeller with forward-curved blades (GXLF), make sure that it has been connected to ducting that conforms to the design pressure drop so that the motor will not be overloaded. Checking the bearings a) Permanently lubricated bearings: The bearings might have dripped grease while the fan was transported and in storage. Clean the external surface of the bearing. b) Plummer block bearings: Check the bearing temperature and the noise. Check the level of lubricant, if required. 5

6 Centrimaster, GX Maintenance 3.6 Commissioning Briefly switch on the power supply to the motor to check whether the fan impeller rotates in the correct direction. Check that no abnormal mechanical sound and no surging occurs. Check that the level of the vibrations transmitted to the bearings is normal Before maintenance Switch off the power supply to the fan at the safety-isolating switch Checking the bearings Noise or vibrations Grease Bearing temperature Impeller The impeller can be cleaned using a vacuum cleaner, compressed air or by brushing. If the impeller is coated with greasy dirt, it can be washed with a detergent or a solvent. Illustration 3.3 The correct direction of rotation for an impeller with forward-curved blades (type LF). Regularly clean the impeller to keep it in correct balance. Unbalance will give rise to unnecessary vibrations and expose the bearings to additional strain. The impeller can be cleaned whenever necessary but it should be inspected at least once a year. A fouled impeller also reduces fan performance and therefore causes the fan to consume more power Casing See Section Impeller above. Check that the impeller does not come in contact with the inlet cones (type and fans). Illustration 3.4 The correct direction of rotation for an impeller with backward-curved blades (type and ). 4. Service 4.1 Warranty The warranty is valid for one (1) year from the delivery date unless otherwise agreed prior to placing the order. The warranty is only applicable to manufacturing defects. A precondition of the warranty is that regular maintenance be carried out. Defects under warranty must immediately be notified to the manufacturer or the importer. The warranty does not cover belt damages caused by belt(s) being tensioned too tight. The warranty does not cover service work or indirect damages. 4.2 Maintenance plan To guarantee smooth operation, the fan must be serviced regularly. The need for servicing is conditional on the operating conditions. If the air contains dust or particles, the service intervals will have to be shorter. As a general rule, the fan must be inspected at least twice a year. For the most important maintenance measures, see the following sections. The most important maintenance measures Inspecting the bearings In most cases, any flaws in the bearings can be detected by listening. When the bearings are normal, they generate a smooth and uniform sound. Loud and squeaking noise or other abnormal sounds imply that the bearings are worn out. If an electronic stethoscope is used, the abnormal sounds can be detected - and whether there is any defective part as well. A squeaking noise may also be caused by insufficient lubrication. Too small bearing cross-gap can cause a metallic noise. Dents on the outer race of the bearing can cause vibration, which in turn causes a smooth and clear sound. Intermittent sound implies a defective rolling surface. High bearing temperatures are usually a sign that the bearings are running abnormally. Too high temperature is harmful to the grease and bearing itself. Long-term operation at temperatures above 120 C can shorten the useful life of the bearing. High bearing temperature may be due to insufficient or excessive lubrication, impurities in the grease, overloading, bearing damage or too small a bearing cross-gap. Even a slight temperature change can be a sign of impaired operation if the operating conditions have not changed. Refilling with lubricant will normally cause a rise in bearing temperature lasting one or two days. Check the grease. A change of colour or darkening is usually a sign that there are impurities in the grease. Larger grains of impurities can be detected by rubbing Version Fläkt Woods Oy 6

7 Maintenance Centrimaster, GX Specifications are subject to alteration the grease between your fingers. Check also the gaskets (V-rings, for example) and change them as the need arises Permanently lubricated bearings The permanently lubricated bearings have been factorylubricated to last throughout their entire useful life (20,000-40,000 hours of operation). High-quality gaskets in the bearing prevent lubricant from seeping out and dripping. The maintenance of this type of bearing consists of cleaning its external surfaces and inspection to detect any possible abnormal operation or defective gaskets. If the latter is detected, the bearings will have to be replaced. Use proper tools to prevent blows that cause dents on the bearing race. Even the slightest blows can cause the bearing to emit a scratchy noise. This will lead to premature ageing Plummer blocks with ball bearings The bearings have been factory-lubricated. As a general rule the bearings should be relubricated every 6 months. The amount of grease for relubrication is given in the table 4.1. or 4.2. These bearings are equipped with highquality sealings and the change of the grease is not possible without damaging the sealings. If the bearing is damaged, the whole plummer block including the bearing should be changed Plummer blocks with roller bearings Relubrication Plummer block bearings in a fan running 8 hours/day should be relubricated once a year. Plummer block bearings should be relubricated twice a year if the fan is operated around the clock. New grease is usually injected while the fan is operating. If the bearing is relubricated during a maintenance downtime, for instance, the impeller must be rotated in order to distribute the grease uniformly in the bearing. The amount of grease required for relubrication is as follows: x bearing outer diameter x bearing width Please note that an excessive amount of grease can cause a temperature peak in the bearing, which in turn can damage the lubrication properties of the grease and lead to bearing damage. Filling with grease should be stopped when excessive grease starts to seep out of the bearing. Replacing the grease After the bearing has been relubricated a number of times or if the grease has become caked, darkened or faded (compare with its original colour), the grease should be replaced as follows. 1. Clean the outside of the bearing housing. Open the bearing cover. 2. Remove all the old grease. Wash the bearing with white spirit or paraffin oil. Petrol may also be used but bear in mind its inflammability! Check the bearing after cleaning. If even a slightest flaw is discovered, the bearing will have to be replaced. The bearing should be oiled. Bearings rust easily if they are not installed. 3. Spread new grease on the rolling surface by hand or by using a plastic smoothing tool. Fill the empty space in the bottom half of the bearing housing halfway with new grease. Do not overfill. An excessive amount of grease can give rise to increased bearing temperatures. 4. Fit the upper half of the bearing housing. See also Section Mounting the plummer block bearing. 5. Check out the bearing using a screwdriver as a simple stethoscope (placing the tip against the bearing housing and the handle against your ear). The bearing is running properly if you hear a weak humming sound. A whistling sound indicates inadequate lubrication. Table 4.1 Amount of grease for relubrication Table 4.2 Amount of grease for relubrication, bearings type GTLZ-06/07/08/09/16/17 Fan Fan Impeller type (g) Impeller type (g) LF/ LF// Recommended lubricants Only high quality bearing greases should be used such as the following: Standard operating conditions for the bearing ( C) SKF Alfalub LGMT 2 Mobilux 2 Shell Alvania R2 Esso Beacon 2 10 LF/ N.B. Use protective gloves. Regular exposure to paraffin oils, dissolvents, etc. can cause allergic reactions. 18 LF/ LF/

8 Centrimaster, GX Maintenance 5. Maintenance 5.1 Bearing types and design Permanently lubricated ball bearing with eccentric locking collar (-bearing) 1. Bearing 2. Eccentric locking collar 3. Stop screw 4. Bearing damper, rubber Permanently lubricated ball bearing with conical adapter sleeve (S-bearing) 1. Bearing 2. Adapter sleeve 3. Lock washer 4. Nut 5. Bearing damper, rubber Plummer block with ball bearing (B-bearings) 1. Bearing housing 2. Grease nipple 3. Eccentric locking collar 4. Stop screw S = Plummer block with ball bearing (with conical adapter sleeve) Plummer block with roller bearing (H-bearing) 1. Bearing housing (SNL...): Upper half and bottom half 2. Self-aligning roller bearing 3. Adapter sleeve 4. Lock washer 5. Nut 6. Gasket set 7. Guide ring (only in one bearing housing) 8. Grease nipple 5.2 Replacing the bearings Dismantling the ball bearing with eccentric locking collar ( bearing) Step 1 Back off the stop screw using an Allen key. Version Fläkt Woods Oy 8

9 Maintenance Centrimaster, GX Step 2 Unscrew the eccentric locking collar (usually in the direction that is opposite to the direction of rotation of the fan). Measure and mark the position of the bearing on the shaft, x = mm. Support the shaft using a band or a rope to suspend it. Place the band between the bearing bracket and the impeller and attach it with a screw or bolt to one of the fixing holes on the fan casing. Remove the bearing bracket. X Step 3 Dismantle the bearing bracket. The bearing is glued to the shaft. Use an extractor tool to remove the bearing from the shaft. Attach the claws of the extractor tool to the inner ring of the bearing. ou can also remove the bearing by tapping the inner ring of the bearing with a hammer. Step 4 Replace the bearing and the bearing damper (see the Spare Parts List) Mounting the ball bearing with eccentric locking collar ( bearing) Step 1 Wipe the inner surface of the bearing to remove the protective film. Put the bearing into the bearing damper. Specifications are subject to alteration Step 2 Mount the bearing bracket on the bearing and bearing damper. 9

10 Centrimaster, GX Maintenance Step 3 Clean the shaft carefully. Apply glue (Loctite 603) to the shaft. Mount the bearing bracket with bearing at the marked position on the shaft. Fit the bearing bracket to the fan casing. Step 4 Mount the eccentric locking collar to the inner ring of the bearing and turn it firmly by hand in the direction of rotation of the fan until the collar is locked in position. Step 5 Tighten the stop screw using an Allen key. If you can measure the torque, do not exceed the relevant value specified in Table 5.2. Excessive torque can cause the inner ring of the bearing to crack. Table 5.2. Max. permissible torque, M, for the stop screw Fan Impeller type M (Nm) LF/ LF/ LF/ Step 6 Rotate the fan impeller and conduct a final inspection Dismantling the permanently lubricated ball bearing with conical adapter sleeve (S-bearing) Step 1 Release the lock washer tab. Open the nut with a hook wrench. Version Fläkt Woods Oy 10

11 Maintenance Centrimaster, GX Step 2 Remove the lock washer and the nut. Measure and mark the position of the bearing on the shaft, x = mm. Support the shaft using a band or a rope to suspend it. Place the band between the bearing bracket and the impeller and attach it with a screw or bolt to one of the fixing holes on the fan casing. Push the adapter sleeve from the bearing. Step 3 Remove the bearing brackets from the casing. Remove the bearing set. Slide the adapter sleeve off the shaft. If necessary, use a screwdriver to loosen the adapter sleeve so it will slide more smoothly. Dismantle the bearing brackets and the bearing from the bearing damper Mounting the permanently lubricated ball bearing with conical adapter sleeve (S-bearing) Step 1 Wipe the inner surface of the bearing to remove the protective film. Apply a thin coating of mineral oil on the inner surface of the adapter sleeve. Put the bearing into the bearing damper. Step 2 Mount the bearing bracket on the bearing and bearing damper so the larger end (having larger diameter) of the inner ring of the bearing faces the cone of the adapter sleeve. Specifications are subject to alteration Step 3 Lubricate the threads of the adapter sleeve and the nut with molybdenum disulphide compound or similar lubricant. Slide the adapter sleeve onto the shaft. If necessary, use a screwdriver to loosen the adapter sleeve so it will slide more smoothly. 11

12 Centrimaster, GX Maintenance Step 4 Slide the bearing bracket with the assembled bearing on the shaft and push the adapter sleeve into the bearing. If necessary, use the nut to draw the adapter sleeve into the bearing. Secure the bearing bracket to the fan casing. Step 5 Centre the bearings at the marked position on the shaft. Mount the lock washer and turn the nut first by hand. The slanted side of the nut must be against the bearing. Step 6 Turn the nut with a hook wrench at the appropriate torque M (Nm) specified in Table 5.3. Lock the nut by turning one of the lock washer tabs into the slot of the nut. If you have to adjust the nut so that the tab matches the slot, tighten the nut (do not back it off). Table 5.3 Max. permissible torque, M, for the adapter sleeve Fan Impeller type M (Nm) Dismantling the plummer block with roller bearing Step 1 Clean the external surfaces of the bearing before starting the maintenance work. Step 2 Unscrew the bolts and lift the upper half of the bearing housing off the lower half. Measure and mark the position of the bearing on the shaft, x = mm, so that you can mount the bearing at the same place. Version Fläkt Woods Oy 12

13 Maintenance Centrimaster, GX Step 3 Release the lock washer tab. Step 4 Unscrew the nut with a hook wrench. Step 5 Lift the shaft from the bearing housing. Step 6 Remove the nut, lock washer and the bearing from the shaft. Specifications are subject to alteration Mounting the plummer block with roller bearing Step 1 Mount the bearing housing (SNL...) so that the grease nipple is facing the fan impeller. The direction of the motion of the grease in the bearing housing must be opposite to the direction of impeller rotation. Clean the inside of the bearing housing. 13

14 Centrimaster, GX Maintenance Step 2 To mount the gasket set (TSN 5...G), proceed as follows: Cut a 90-degree slit into one of the four gasket halves. Mount the gasket half with the slit into the bottom half of the bearing housing on the side opposite that of the grease nipple. This will guarantee that excessive grease can seep out of the bearing housing. Step 3 Mount the bottom half of the bearing housing loosely on the bearing bracket so that it can be positioned. Mount the gasket halves in the slots of the bearing housing and fill the slots of the gasket halves with grease (SKF type LGMT2 grease). Step 4 Wipe the inner surface of the bearing (222...CCK/C3W33) and the adapter sleeve (H3.../VZ425) to remove the protective film. Apply a thin coating of mineral oil on the inner surface of the adapter sleeve. Lubricate the threads of the adapter sleeve and the nut with molybdenum disulphide compound or similar lubricant. Slide the adapter sleeve onto the shaft. If necessary, use a screwdriver to loosen the adapter sleeve so it will slide more smoothly. Mount the bearing on the adapter sleeve. Push the larger side of the inner ring of the bearing towards the cone of the adapter sleeve. When the bearing takes hold of the adapter sleeve, push the bearing with the adapter sleeve to their position on the shaft. Step 5 After having oiled the side of the nut that is facing the bearing, place the lock washer and the nut at their position; the slanted side of the nut must face the bearing. Fill the bearing with grease (SKF type LGMT2 grease). The bearing must be completely filled with grease. Place the shaft with the bearing into the bearing housing. Slide the guide rings (FRB..., 2 pieces) into the bottom half of the bearing housing of the guide bearing. The guide bearing is on the drive side of the fan. If the drive side is not known, the guide bearing is on the right-hand side of the fan. Step 6 Tighten the nut with a hook wrench. See Table 5.4 for the appropriate torque, M. Table 5.4 Torque, M Fan M (Nm) Version Fläkt Woods Oy 14

15 Maintenance Centrimaster, GX Step 7 Lock the nut by turning one of the lock washer tabs into the slot of the nut. If you have to adjust the nut so that the tab matches the slot, tighten the nut (do not back it off). Step 8 Fill the bearing housing up to 30% of its volume with grease (SKF type LGMT2 grease). Table 5.5 Volume of grease for bearing housings Fan Bearing hous. Volume (g) 056 SNL SNL SNL SNL SNL SNL Mount the upper half of the bearing housing and secure it by means of bolts. The appropriate torque is specified in Table 5.6. Table 5.6 Torque, M, for the bolts of the bearing housing Fan M (Nm) Step 9 When both bearings have been mounted, tighten the bolts that fasten the bearing housing to the bearing brackets. Table 5.7 Torque, M, for the bolts that fasten the bearing housing to the bearing brackets Fan M (Nm) Dismantling the plummer block with ball bearing Specifications are subject to alteration Step 1 Before starting support the shaft carefully by using a band or a rope. Place the band/rope between the bearing bracket and the impeller. Please note that the impeller weighs 100 to 250 kg depending on th efan size. For detailed wieght, please refer to the spare parts list. 15

16 Centrimaster, GX Maintenance Step 2 Back off the stop screw using an Allen key Step 3 Unscrew the eccentric locking collar by turning it in the direction that is opposite to the direction of rotation of the fan. Measure and mark th eposition of the bearing on the shaft x = mm X Step 4 Loosen the bolts of the plummer block and suspend the shaft with the rope/band. Tighten the rope/band so that the impeller does not touch the inlet cone. The bearing is glued to the shaft. Use an extractor tool to remove the bearing from the shaft. Attach the claws of the extractor tool to the inner ring of the bearing. ou can also remove the bearing by tapping the inner ring of the bearing with a hammer. Step 5 Replace the plummer block Mounting the plummer block with ball bearing Step 1 Wipe the inner surface of the bearing to remove the protective film. Apply glue (Loctite 603) to the shaft. The glue fastens the joint and prevents corrosion. Mount the bearing at the marked position on the shaft. Glue Version Fläkt Woods Oy 16

17 Maintenance Centrimaster, GX Step 2 Fasten the bolts of the plummer block. Step 3 Mount the eccentric locking collar to the inner ring of the bearing and turn it firmly by hand in the direction of rotation of the fan until the collar is locked in the position. Step 4 Tighten the stop screw using an Allen key. If you can measure the torque, do not exceed the relevant value specified in the Table 5.2. Excessive torque can cause the inner ring of the bearing to crack. Table 5.8 Max. permissible torque, M, for the stop screw Fan M (Nm) Step 5 Rotate the fan impeller and conduct a final inspection. 5.3 Impeller Specifications are subject to alteration Removing the impeller (sizes ) Step 1 Measure and mark the position of the bearings on the shaft (x = mm), so that you can mount the impeller in the same place. Support the shaft using a band or a rope to suspend it. Place the band between the bearing bracket and the impeller and attach it with a screw or bolt to one of the fixing holes on the fan casing. 17

18 Centrimaster, GX Maintenance Step 2 Remove the bearing brackets from the casing. Loosen the bearings according to the instructions in Section 5.2 and slide the bearing brackets with the bearings off the shaft. Remove the inlet cones if the impeller has backward-curved blades (GX and GX). Step 3 Carefully place the impeller on the bottom of the fan casing. Also remove the cut-off plate from the fan outlet. Step 4 Measure and mark the position of the impeller on the shaft. Back off the nut(s) of the hub and withdraw the shaft. Step 5 Withdraw the shaft from the fan inlet. Remove the impeller from the fan outlet Mounting the impeller (sizes ) Step 1 Place the impeller inside the fan casing. Version Fläkt Woods Oy 18

19 Maintenance Centrimaster, GX Step 2 Place the key onto the shaft. The keyway of the type and fans is eccentric in the shaft. Place the shorter end of the shaft towards the hub side. Step 3 Mount the inlet cones (type and fans) so that they extend into the impeller. Push the bearing bracket with the assembled bearing onto the shaft. Secure the bearing brackets to the fan casing. Mount the bearings on the shaft (see Section 5.2). Step 4 Centre the impeller in the middle of the casing. Tighten the nut(s) of the hub using an Allen key. See Table 5.8 for the appropriate torque. Mount the cut-off plate. Table 5.8 Torque, M, for the nut of the hub. Fan Impeller type M (Nm) LF LF Removing the impeller (sizes ) Specifications are subject to alteration Step 1 Measure and mark the position of the bearings on the shaft (x = mm), so that you can mount the impeller in the same place. Support the shaft at the both sides of the fan by using a rope or band. Place the rope/band between the bearing bracket and the impeller and attach it to the supporting frame or use an separate support beam etc. 19

20 Centrimaster, GX Maintenance Step 2 Dismantle and remove the plummer block from the drive side. From the opposite side you can just loosen the bolts of the plummer block. Step 3 Remove the bearing bracket and the screws of the inlet cone. Step 4 Lower the impeller to the bottom of the fan casing. Step 5 Remove the impeller and the shaft from the fan casing. Step 6 Measure and mark the position of the impeller on the shaft. Back off the nut(s) of the hub and withdraw the shaft. Version Fläkt Woods Oy 20

21 Maintenance Centrimaster, GX Mounting the impeller (sizes ) Step 1 Place the key onto the shaft. Push the shaft into the impeller, to the marked position. Step 2 Lift the impeller and place the inlet cones. Step 3 Lift the impeller to right height. Mount the bearing brackets. Mount the bearings (see Mounting the plummer block) Step 4 Mount the inlet cone. Specifications are subject to alteration 21

22 Centrimaster, GX Maintenance Step 5 Center the impeller in the middle of the fan casing. Tighten the nut(s) of the hub using an Allen key. Check by rotating the impeller that the inlet cone is concentric. = = Mounting an impeller with backward-curved blades (type and ) and the inlet cone Centre the impeller and the inlet cone. The dimension S and the dimension T must be constant throughout. Check by rotating the impeller to determine that the inlet cone is concentric. Version Fläkt Woods Oy 22

23 Maintenance Centrimaster, GX Final examination Check that: The impeller is mounted for the correct direction of rotation. All nuts and screws have been tightened. No foreign objects remain inside the fan casing. See also Section 3: Installation and Commissioning. Illustration 5.1 The correct direction of rotation for an impeller with forward-curved blades (type LF) Illustration 5.2 The correct direction of rotation for an impeller with backward-curved blades (type and ) Specifications are subject to alteration 23

24 Centrimaster, GX Maintenance 6. Trouble-shooting Pressure rise and air flow are too low: Check the direction of rotation and the speed of the fan impeller. Check that the air flow is not disturbed by any fold in the flexible duct. Check if there is any distorting bend immediately downstream of the fan outlet. Such a bend can give rise to excessive connection losses. Check the duct system and if necessary, fit guide vanes. The fan vibrates: Check the anti-vibration mountings. Check that the impeller is clean. Check the bearings. Check the alignment of the belt drive pulleys. Check that the bearings, hub and pulleys are properly secured. Abnormal noise from the bearings: See Section 4.2.5: Checking the bearings. Repeated bearing damage: Excessive bearing loads (i.e. belts have been tensioned too much). Poor or inadequate lubrication. Impurities have entered the bearing. 7. Scrapping the fan The materials are tabulated in Table 7.1. The bearings should be disposed of in accordance with SKF instructions. Table 7.1 Materials Bearings Fan casing Impeller type Accessories Component Scroll plate Side plate Cut-off plate Inlet cone Inlet cone, spark-proof version Bearing bracket Bearing damper Bearing Impeller, Impeller, and Impeller LF Hub, and Hub, LF Shaft Feet/Frame Discharge flange Flexible connection DIN DIN DIN DIN DIN DIN DIN 1623 DIN DIN Standard Designation St 02Z St 05Z St 02Z St 05Z St 02Z St 12 St 02Z St 02Z EN EN EN EN EN EN EN DX51D+Z DX51D+Z Standard Designation DX51D+Z DX53D+Z DX51D+Z DX53D+Z DX51D+Z DC01 DX51D+Z DX51D+Z FW-code RAGAL 51F RAGAL 53F RAGAL 51F RAGAL 53F MS63-02 RAGAL 51F EPDM Special steel RACOLD 01F RAEX HSF 420 AISi 12 SS SS RAGAL 51F RAGAL 51F PVC-fabric Version Fläkt Woods Oy 24

25 Maintenance Centrimaster, GX Specifications are subject to alteration 25

26 GX/GB 04/2003 Fläkt Woods Oy Kalevantie 39 FIN Turku Finland t f w

EUL(B,F) FAN. Fläkt Woods 3178 GB Specifications are subject to alteration without notice

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