Centrimaster, GX

Centrimaster, GX
Installation and Maintenance
Instructions
31.1.2001
Centrimaster, GX
2
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 31.1.2001 © Fläkt Woods Oy
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
Installation
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 LB and HB 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
Specifications are subject to alteration
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.
Illustration 2.1 Structural parts of the fan
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.
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).
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 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.
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.
2.3 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).
Table 1.1 Weight of fans including the packaging (approx. 10%)
Impeller
type
LF
LB
HB
014
5
016
5.3
018
6.7
020
9.2
022
11.4
12.5
025
13.4
15
028
18.5
18
031
23
25
Fan size
035
040
30
38
33
43
33
44
045
48
53
55
050
57
64
66
056
87
97
113
063
107
128
143
071
142
153
154
080
260
267
284
090
318
353
400
100
429
453
3
Centrimaster, GX
Installation
2.4 Bearings
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.
2.4.1 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)
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).
Fr
Illustration 2.6 Radial force Fr
Illustration 2.4 Plummer block with ball bearing
llustration 2.5 Plummer block with roller bearing (PL)
Table 2.1 Types of bearings
Impeller
type
LF
LB
HB
014
D
016
D
018
D
020
S
022
Y
Y
025
Y
Y
028
Y
Y
031
Y
Y
Fan size
035
040
Y
Y
Y
Y
S
S
045
Y
Y
S
050
Y
Y
S
056
Y
Y
H
063
Y
Y
H
071
Y
Y
H
080
YB
YB
H
090
YB
YB
H
100
100
YB
H
Impeller
type
LF
LB
HB
014
450
016
450
018
450
020
450
022
450
450
025
450
450
028
620
560
031
670
620
Fan size
035
040
900
1050
900
900
1100 1200
045
1200
1200
1500
050
1500
1350
1650
056
1900
1600
5000
063
2200
1900
6000
071
2300
1950
6000
080
2880
2880
8000
090
3550
3550
8000
4300
8000
050
YS
YS
YS
056
H
H
063
H
H
071
H
H
080
090
100
Table 2.3. Types of bearing, accessories GTLZ-06/07/08/09/16/17
Impeller
type
LF
LB
HB
4
014
016
018
020
022
YS
YS
025
YS
YS
028
YS
YS
031
YS
YS
Fan size
035
040
YS
YS
YS
YS
YS
YS
045
YS
YS
YS
Version 31.1.2001 © Fläkt Woods Oy
Table 2.2 Max. permissible radial force, Fr , applied to the fan shaft, standard bearings
Installation
Centrimaster, GX
Table 2.4. Max. permissible radial force, Fr , applied to the fan shaft, bearings type GTLZ-06/07/08/09/16/17
Impeller
type
LF
LB
HB
014
016
018
020
022
700
650
025
750
650
028
1100
1000
031
1150
1000
Fan size
035
040
1650 1700
1400 1400
1100 1200
045
2200
1800
1500
050
2300
2000
1650
056
5000
5000
063
6000
6000
071
6000
6000
080
090
100
Table 2.5 Useful life of bearings, L10
Impeller
type
LF
LB
HB
Fan size
090
100
080
071
063
056
050
045
040
035
031
028
025
016
018
020
022
014
20000
20000
20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000
20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000 20000
40000 40000 40000 40000 40000 40000 40000 40000 40000 40000
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.
Specifications are subject to alteration
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
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.
Illustration 3.1 Fan with the shaft vertical
The fan must not be mounted with the casing slanted.
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
Centrimaster, GX
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.
Maintenance
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.
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.
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
Illustration 3.4 The correct direction of rotation for an
impeller with backward-curved blades (type LB and HB). 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
4. Service
well. A squeaking noise may also be caused by
insufficient lubrication. Too small bearing cross-gap can
4.1 Warranty
cause a metallic noise. Dents on the outer race of the
The warranty is valid for one (1) year from the delivery
bearing can cause vibration, which in turn causes a
date unless otherwise agreed prior to placing the order.
smooth and clear sound. Intermittent sound implies a
The warranty is only applicable to manufacturing defects. defective rolling surface.
A precondition of the warranty is that regular
maintenance be carried out. Defects under warranty
High bearing temperatures are usually a sign that the
must immediately be notified to the manufacturer or the
bearings are running abnormally. Too high temperature
importer. The warranty does not cover belt damages
is harmful to the grease and bearing itself. Long-term
caused by belt(s) being tensioned too tight. The warranty
operation at temperatures above 120°C can shorten the
does not cover service work or indirect damages.
useful life of the bearing. High bearing temperature may
be due to insufficient or excessive lubrication, impurities
4.2 Maintenance plan
in the grease, overloading, bearing damage or too small
To guarantee smooth operation, the fan must be
a bearing cross-gap. Even a slight temperature change
serviced regularly. The need for servicing is conditional
can be a sign of impaired operation if the operating
on the operating conditions. If the air contains dust or
conditions have not changed. Refilling with lubricant will
particles, the service intervals will have to be shorter. As
normally cause a rise in bearing temperature lasting one
a general rule, the fan must be inspected at least twice a
or two days.
year. For the most important maintenance measures,
Check the grease. A change of colour or darkening is
see the following sections.
usually a sign that there are impurities in the grease.
Larger grains of impurities can be detected by rubbing
The most important maintenance measures
6
Version 31.1.2001 © Fläkt Woods Oy
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).
Maintenance
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 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.
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 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.
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
Specifications are subject to alteration
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.
Centrimaster, GX
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
Fan
Impeller type
(g)
056
HB
10
063
HB
11
Fan size
080
090
071
HB LF/LB HB LF/LB HB
6
18
8
20
13
100
LB
14
HB
23
Table 4.2 Amount of grease for relubrication,
bearings type GTLZ-06/07/08/09/16/17
Fan size
022 025 028 031 035 040 045 050 056 063 071
LF/LB
LF/LB
LF/LB/HB
Impeller type
8
8
10 10 13 13 15 15 10 11 11
(g)
Fan
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.
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
7
Centrimaster, GX
Maintenance
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
5.2.1 Dismantling the ball bearing with eccentric locking
collar (Y bearing)
Step 1
Back off the stop screw using an Allen key.
8
Version 31.1.2001 © Fläkt Woods Oy
5.2 Replacing the bearings
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. 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)
Specifications are subject to alteration
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.
9
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 size
022 025 028 031 035 040 045 050 056 063 071
LF/LB
LF/LB
Impeller type
LF/LB
4
4
4
7
7
17 17 17 17 17
M (Nm)
4
Fan
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.
10
Version 31.1.2001 © Fläkt Woods Oy
Step 6
Rotate the fan impeller and conduct a final inspection.
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.
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.
Specifications are subject to alteration
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.
11
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)
035
HB
30
Fan size
040
045
HB
HB
30
35
050
HB
35
5.2.5 Dismantling the plummer block with roller bearing
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.
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Version 31.1.2001 © Fläkt Woods Oy
Step 1
Clean the external surfaces of the bearing before
starting the maintenance work.
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
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.
13
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 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)
14
056
60
063
60
Fan size
071
080
60
60
090
60
100
60
Version 31.1.2001 © Fläkt Woods Oy
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.
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 size
080
090
100
056
063
071
Bearing hous. SNL-509 SNL-510 SNL-510 SNL-513 SNL-515 SNL-516
180
230
280
Volume (g)
65
75
75
Fan
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)
056
50
063
50
Fan size
080
071
80
50
090
80
100
80
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)
056
90
063
90
Fan size
071
080
90
150
090
150
100
200
Specifications are subject to alteration
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.
15
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.
You can also remove the bearing by tapping the inner
ring of the bearing with a hammer.
Step 5
Replace the plummer block.
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.
16
Glue
Version 31.1.2001 © Fläkt Woods Oy
5.2.8 Mounting the plummer block with ball bearing
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)
080
27
Fan size
090
27
100
27
Step 5
Rotate the fan impeller and conduct a final inspection.
Specifications are subject to alteration
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.
17
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 (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.
Step 1
Place the impeller inside the fan casing.
18
Version 31.1.2001 © Fläkt Woods Oy
5.3.2 Mounting the impeller (sizes 014...071)
Maintenance
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
035
022 025 028 031
Impeller type LB LB LB LB LB HB
4
M (Nm)
4
4
7
7
4
040
LB HB
7
7
045
LB HB
7
7
050
LB HB
7
7
Fan size
056
LB HB
7 10
063
LB HB
10 10
071
LB HB
10 10
LF
27
080
LB HB
27 27
LF
27
090
LB HB
27 27
100
LB HB
27 27
Specifications are subject to alteration
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.
19
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 6
Measure and mark the position of the impeller on the
shaft. Back off the nut(s) of the hub and withdraw
the shaft.
20
Version 31.1.2001 © Fläkt Woods Oy
Step 5
Remove the impeller and the shaft from the fan casing.
Maintenance
Centrimaster, GX
5.3.4 Mounting the impeller (sizes 080...100)
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)
Specifications are subject to alteration
Step 4
Mount the inlet cone.
21
Centrimaster, GX
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.
Maintenance
=
=
5.3.5 Mounting an impeller with backward-curved
blades (type LB and HB) and the inlet cone
Version 31.1.2001 © Fläkt Woods Oy
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.
22
Maintenance
Centrimaster, GX
5.3.6 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)
Specifications are subject to alteration
Illustration 5.2 The correct direction of rotation for
an impeller with backward-curved blades (type LB
and HB)
23
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
24
Scroll plate
Side plate
Cut-off plate
Inlet cone
Inlet cone, spark-proof version
Bearing bracket
Bearing damper
Bearing
Impeller, LB 022...028
Impeller, LB and HB 031...100
Impeller LF
Hub, LB and HB
Hub, LF
Shaft
Feet/Frame
Discharge flange
Flexible connection
Standard
Standard
DIN
DIN 17162
DIN 17162
DIN 17162
DIN 17162
Designation
St 02Z
St 05Z
St 02Z
St 05Z
EN
EN 10147
EN 10147
EN 10147
EN 10147
Designation
DX51D+Z
DX53D+Z
DX51D+Z
DX53D+Z
DIN 17162
St 02Z
EN 10147
DX51D+Z
DIN 1623
St 12
EN 10130
DC01
DIN 17162
DIN 17162
St 02Z
St 02Z
DX51D+Z
DX51D+Z
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 141914-04
SS 142142-00
RAGAL 51F
RAGAL 51F
PVC-fabric
Version 31.1.2001 © Fläkt Woods Oy
Accessories
Impeller type
Bearings
Fan casing
Component
Specifications are subject to alteration
Maintenance
Centrimaster, GX
25
GX/GB 04/2003
Fläkt Woods Oy Kalevantie 39 FIN-20520 Turku Finland
t + 358 20 442 3000 f + 358 20 442 3016
w www.flaktwoods.com