FläktGroup Centrimaster GX Installation guide

Brand: FläktGroup

Model: Centrimaster GX

Type: Installation guide

FläktGroup Centrimaster GX is a high-quality fan 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 will prevent sparking in the event that the impeller comes in contact with the inlet cone. The standard operating temperature of the fan is -30...+80°C. Under normal operating conditions, the sound power level will exceed 70 dB (A). For detailed particulars, see the fan catalog.

Centrimaster, GX

Installation and Maintenance

Instructions

31.1.2001

Version 31.1.2001 © Fläkt Woods Oy

Centrimaster, GX

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

Installation

General ................................................................................................ 2

1. Receiving and inspecting the product .......... 2

1.1 Inspection ..................................................................................... 2

1.2 Data on the rating plate ................................................................. 2

1.3 Handling and lifting the fan .......................................................... 2

1.4 Weight of the products.................................................................. 3

1.5 Storing the fan .............................................................................. 3

2. Function and design of the fan ..................... 3

2.1 Design........................................................................................... 3

2.2 Operating conditions .................................................................... 3

2.3 Balancing ...................................................................................... 3

2.4 Bearings ........................................................................................ 4

2.4.1 Type of bearings according to the fan type and size .................. 4

2.4.2 Max. permissible belt force on the fan shaft.............................. 4

2.4.3 Useful life of bearings ................................................................ 4

2.5 Free access to the fan ................................................................... 4

3. Installation and commissioning .................... 5

3.1 Installation of the fan .................................................................... 5

3.2 Fitting the accessories .................................................................. 5

3.3 How not to install the fan .............................................................. 5

3.4 Inspection after the fan has been installed.................................... 5

3.5 Measures to be taken prior to commissioning ............................. 5

3.6 Commissioning ............................................................................ 6

4. Service .......................................................... 6

4.1 Warranty........................................................................................ 6

4.2 Maintenance plan.......................................................................... 6

4.2.1 Before maintenance ................................................................... 6

4.2.2 Checking the bearings ............................................................... 6

4.2.3 Impeller ...................................................................................... 6

4.2.4 Casing........................................................................................ 6

4.2.5 Inspecting the bearings ............................................................. 6

4.2.6 Permanently lubricated bearings ............................................... 7

4.2.7 Plummer blocks with ball bearings ........................................... 7

4.2.8 Plummer blocks with roller bearings ......................................... 7

4.2.9 Recommended lubricants .......................................................... 7

5. Maintenance ................................................. 8

5.1 Bearing types and design ............................................................. 8

5.2 Replacing the bearings ................................................................. 8

5.2.1 Dismantling the ball bearing with eccentric locking

collar (Y bearing) ................................................................................ 8

5.2.2 Mounting the ball bearing with eccentric locking

collar (Y bearing) ................................................................................ 9

5.2.3 Dismantling the permanently lubricated ball bearing with

conical adapter sleeve (S-bearing) ................................................... 10

5.2.4 Mounting the permanently lubricated ball bearing with

conical adapter sleeve (S-bearing) ................................................... 11

5.2.5 Dismantling the plummer block with roller bearing ................ 12

5.2.6 Mounting the plummer block with roller bearing .................... 13

5.2.7 Dismantling the plummer block with ball bearing ................... 15

5.2.8 Mounting the plummer block with ball bearing....................... 16

5.3 Impeller ....................................................................................... 17

5.3.1 Removing the impeller (sizes 014...071) ................................. 17

5.3.2 Mounting the impeller (sizes 014...071) ................................. 18

5.3.3 Removing the impeller (sizes 080...100) ................................. 19

5.3.4 Mounting the impeller (sizes 080...100) ................................. 21

5.3.5 Mounting an impeller with backward-curved blades

(type LB and HB) and the inlet cone ................................................. 22

5.3.6 Final examination .................................................................... 23

6. Trouble-shooting ......................................... 24

7. Scrapping the fan........................................ 24

Specifications are subject to alteration

Centrimaster, GX

Table 1.1 Weight of fans including the packaging (approx. 10%)

Impeller

type 014

Fan size

016

5.3

018

6.7

020

9.2

022

11.4

12.5

025

13.4

028

18.5

031

035

040

045

050

056

113

063

107

128

143

071

142

153

154

100

429

453

090

318

353

400

080

260

267

284

Installation

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.

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: -40...+70°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.

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.

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 LB and HB fans)

6. Bearings and bearing brackets

7. Flange

8. Frame

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

-30...+80°C. Under normal operating conditions, the

sound power level will exceed 70 dB (A). For detailed

particulars, see the fan catalogue.

2.3 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).

Version 31.1.2001 © Fläkt Woods Oy

Centrimaster, GX

2.4 Bearings

2.4.1 Type of bearings according to the fan

type and size

Illustration 2.2 Permanently lubricated ball bearing

with eccentric locking collar (Y bearing)

Illustration 2.3 Permanently lubricated ball bearing

with conical adapter sleeve (KH)

Illustration 2.4 Plummer block with ball bearing

llustration 2.5 Plummer block with roller bearing (PL)

2.4.2 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, Fr,

is assumed to be exerted on the shaft end.

2.4.3 Useful life of bearings

The nominal useful service life of the bearings L10 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 014...071 the impeller can be

removed from the fan outlet and in fan sizes 080...100

from the fan inlet (for cleaning or balancing, for instance).

Illustration 2.6 Radial force Fr

Table 2.1 Types of bearings

Impeller

type 014

Fan size

016

018

020

022

025

028

031

035

040

045

050

056

063

071

100

090

080

Table 2.2 Max. permissible radial force, Fr , applied to the fan shaft, standard bearings

Impeller

type 014

450

Fan size

016

450

018

450

020

450

022

450

025

450

028

620

560

031

670

620

035

900

1100

040

1050

900

1200

045

1200

1500

050

1500

1350

1650

056

1900

1600

5000

063

2200

1900

6000

071

2300

1950

6000

100

4300

8000

090

3550

8000

080

2880

8000

Table 2.3. Types of bearing, accessories GTLZ-06/07/08/09/16/17

Impeller

type 014

Fan size

016 018 020 022

025

028

031

035

040

045

050

056

063

071

100090080

Installation

Specifications are subject to alteration

Centrimaster, GX

Table 2.5 Useful life of bearings, L10

Impeller

type 014

20000

Fan size

016

20000

018

20000

020

20000

022

20000

025

20000

028

20000

031

20000

035

20000

40000

040

20000

40000

045

20000

40000

050

20000

40000

056

20000

40000

063

20000

40000

071

20000

40000

100

20000

40000

090

20000

40000

080

20000

40000

Table 2.4. Max. permissible radial force, Fr , applied to the fan shaft, bearings type GTLZ-06/07/08/09/16/17

Impeller

type 014

Fan size

016 018 020 022

700

650

025

750

650

028

1100

1000

031

1150

1000

035

1650

1400

1100

040

1700

1400

1200

045

2200

1800

1500

050

2300

2000

1650

056

5000

063

6000

071

6000

100090080

3.3 How not to install the fan

The fan must not be mounted with the shaft vertical.

Illustration 3.1 Fan with the shaft vertical

The fan must not be mounted with the casing slanted.

3. 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.

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

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.

Installation

Version 31.1.2001 © Fläkt Woods Oy

Centrimaster, GX

4.2.1 Before maintenance

– Switch off the power supply to the fan at the

safety-isolating switch.

4.2.2 Checking the bearings

– Noise or vibrations

– Grease

– Bearing temperature

4.2.3 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.

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.

4.2.4 Casing

– See Section 4.2.3 Impeller above.

– Check that the impeller does not come in contact

with the inlet cones (type LB and HB fans).

4.2.5 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

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

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.

Illustration 3.3 The correct direction of rotation for an

impeller with forward-curved blades (type LF).

Illustration 3.4 The correct direction of rotation for an

impeller with backward-curved blades (type LB and HB).

Specifications are subject to alteration

Centrimaster, GXMaintenance

the grease between your fingers. Check also the gaskets

(V-rings, for example) and change them as the need

arises.

4.2.6 Permanently lubricated bearings

The permanently lubricated bearings have been factory-

lubricated 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.

4.2.7 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 high-

quality 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.

4.2.8 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:

0.005 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 5.2.6 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

4.2.9 Recommended lubricants

Only high quality bearing greases should be used such

as the following:

Standard operating conditions for the bearing

(-30...+110°C)

– SKF Alfalub LGMT 2

– Mobilux 2

– Shell Alvania R2

– Esso Beacon 2

N.B.

Use protective gloves. Regular exposure to paraffin oils,

dissolvents, etc. can cause allergic reactions.

Fan

LF/LB

Impeller type

(g)

Fan size

022

025

028

031

LF/LB/HB

035

040

045

050

LF/LB

056

063

071

Fan 056

063

071

Impeller type

(g)

Fan size

LF/LB

080 090 100

Version 31.1.2001 © Fläkt Woods Oy

Centrimaster, GX

5. Maintenance

5.1 Bearing types and design

Permanently lubricated ball bearing with eccentric

locking collar (Y-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 (YB-bearings)

1. Bearing housing

2. Grease nipple

3. Eccentric locking collar

4. Stop screw

YS = 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

5.2.1 Dismantling the ball bearing with eccentric locking

collar (Y bearing)

Step 1

Back off the stop screw using an Allen key.

Maintenance

Specifications are subject to alteration

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.

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. You 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).

5.2.2 Mounting the ball bearing with eccentric locking

collar (Y bearing)

Step 1

Wipe the inner surface of the bearing to remove the

protective film. Put the bearing into the bearing damper.

Step 2

Mount the bearing bracket on the bearing and bearing

damper.

Maintenance

Version 31.1.2001 © Fläkt Woods Oy

Centrimaster, GX

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 6

Rotate the fan impeller and conduct a final inspection.

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

LF/LB

Impeller type

M (Nm)

Fan size

022

025

028

031

LF/LB

035

040

045

050

LF/LB

056

063

071

5.2.3 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.

Maintenance

Specifications are subject to alteration

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.

5.2.4 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.

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.

Maintenance

Centrimaster, GX

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.

5.2.5 Dismantling the plummer block with roller bearing

Step 1

Clean the external surfaces of the bearing before

starting the maintenance work.

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)

Fan size

035 040 045 050

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.

Maintenance

Specifications are subject to alteration

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.

5.2.6 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.

Maintenance

Centrimaster, GX

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 056

063

071

60M (Nm)

Fan size

080

090

100

Maintenance

Specifications are subject to alteration

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 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

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

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

Bearing hous.

Volume (g)

056

SNL-509

063

SNL-510

071

SNL-510

Fan size

Fan 080

SNL-513

180

090

SNL-515

230

100

SNL-516

280

Fan 056

063

071

50M (Nm)

Fan size

080

090

100

Fan 056

063

071

90M (Nm)

Fan size

080

150

090

150

100

200

5.2.7 Dismantling the plummer block with ball bearing

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.

Maintenance

Centrimaster, GX

Glue

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

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.

You can also remove the bearing by tapping the inner

ring of the bearing with a hammer.

Step 5

Replace the plummer block.

5.2.8 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.

Maintenance

Specifications are subject to alteration

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 5

Rotate the fan impeller and conduct a final inspection.

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)

Fan size

080 090 100

27 27 27

5.3 Impeller

5.3.1 Removing the impeller (sizes 014...071)

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.

Maintenance

Centrimaster, GX

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 (GXLB and GXHB).

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.

5.3.2 Mounting the impeller (sizes 014...071)

Step 1

Place the impeller inside the fan casing.

Maintenance

Specifications are subject to alteration

Centrimaster, GX

Step 2

Place the key onto the shaft. The keyway of the

type LB and HB fans is eccentric in the shaft. Place the

shorter end of the shaft towards the hub side.

Step 3

Mount the inlet cones (type LB and HB 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 022

Impeller type

M (Nm)

Fan size

035

040

045

050

056

063

071

025

028

031

080

090

100

5.3.3 Removing the impeller (sizes 080...100)

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.

Maintenance

Centrimaster, GX

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.

Maintenance

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FläktGroup Centrimaster GX Installation guide

FläktGroup Centrimaster GX Installation guide

FläktGroup Centrimaster GX Installation guide

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