EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 1 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
General
The fan is available in two different versions as shown in
Figures 2 and 3.
Arrangement 1: Open suction. The impeller is mounted
directly on the end of the motor shaft.
Arrangement 7: Open suction. The impeller is mounted
on the intermediate shaft, connected to the motor shaft
by means of a flexible coupling.
The fans can be supplied in two different versions, which
differ in terms of the blade pitch control system.
EULC, d = 1: Pneumatic, single-acting actuator incorpo-
rated into the impeller. An increase in the pressure signal
to the actuator increases the blade angle and thus increases
the delivery air flow. The blade angle is controlled by an
externally mounted positioner.
EULC, d = 2: Mechanically controlled fan which can be
equipped with an external, double-acting electro-mecha-
nical actuator. The control mechanism of the impeller is
actuated by a linkage.
Commissioning the fan
1. Lubricate the motor and shaft bearings before starting
the fan. Lubricate the shaft bearings through the grease
nipples on the fan stand. The quality and grade of gre-
ase are specified on a plate at each lubrication point.
On Arrangement 1 fans, the grease nipples, if any, for
the motor are connected to external grease nipples.
2. Avoid starting the fan against a closed damper or at a
high blade pitch setting.
3. On parallel operation of several fans under control of a
common main controller, check that the loading is
equally distributed, e.g. by comparing the motor cur-
rents. Carry out adjustment by means of the zeroing
screw and the stroke factor screw of the positioner.
Maintenance
CAUTION: To avoid injuries to personnel and damage
to the machinery, remove the fan fuses and open its safety
isolating switch before doing any work on the fan.
General
For maintenance on the motor, follow the motor suppli-
er's instructions. If the shaft coupling of an Arrangement
7 fan must be aligned for any reason, make sure that the
radial or axial run-out does not exceed 0.5 mm. For other
particulars, follow Fläkt Woods instructions 142-1A for
shaft couplings (available from your nearest Fläkt Woods
representative).
If any of the joints listed below has been broken, retighten
to the tightening torque specified in Table 1 or 2.
1. Bolts retaining the motor on the stand.
2. Bolts retaining the intermediate shaft bearing housing
on the stand.
3. Bolts for the taper bush in the shaft coupling.
Fig. 2. Arrangement 1
Fig. 3. Arrangement 7
Fig. 1.
Guide vane cone
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 2 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Table 1
Bolt size Tightening torque, Nm
M10 46 ± 2
M12 90 ± 4
M16 195 ± 10
M20 350 ± 15
M24 520 ± 20
The specified tightening torques apply to unlubricated bolts of strength class 8.8
and tightening by means of a torque wrench. The bolts may be pre-tightened by
means of a nut runner to about 3/4 of the specified torque.
Table 2
The tightening torques for Taper-Lock bushes. Each bush
is marked with its number.
Bush No. Tightening Bush No. Tightening
torque, Nm torque, Nm
1008 5,5 2525 48
1108 5,5 3020 90
1210 19,5 3030 90
1310 19,5 3535 113
1610 19,5 4040 169
2012 32 4545 191
2517 48 5050 245
Every three months
1. Check the control function by adjusting the fan manu-
ally a few times between the minimum and maximum
blade settings.
2. Arrangement 7: Lubricate the shaft bearings through
the grease nipples on the fan stand. This frequency of
lubrication is applicable at a maximum temperature of
70°C measured at the outer race of the bearing. For
frequency of lubrication under different conditions,
see Fläkt Woods instructions 141.0, Rolling contact
bearings (can be requisitioned from your nearest ABB
representative). Grease quantity per bearing: 25 g.
3. Check that the fan vibration level is normal and that
no abnormal sounds are heard from the bearings.
If the vibration level, measured on the bearing housing, is
higher than 7 mm/s, determine the cause and take the
necessary remedial action.
Suitable grades of grease
Shell Alvania Grease G3
Alvania EP Grease 2
Statoil Uniway EP 2 N
BP Energrease LS 2
Mobil Mobilgrease HPM
Castrol Spheerol SW 2 EP
Texaco Multifak EP 2
SKF LGEP 2
LGMT 3
Every other year
(from the date when the fan was delivered by Fläkt
Woods AB)
Arrangement 7
Inspect the rubber ring in the shaft coupling for signs of
cracking. Fit a new rubber ring, if necessary.
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 3 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Fig. 4. EULC, d = 1
1. Blade
2. Screw
3. Screw
4. Washer
5. Shield
6. Screw
7. O-ring
8. Grease nipple
9. Blade mounting
10. Seal
11. Peg
12. Spring
13. Blade spindle
14. Thrust bearing
15. Nut
16. Screw
17. Washer
18. Link
19. Bolt
20. Nut
21. Safety ring
22. Seal
23. O-ring
24. Nut
25. Washer
26. Hub
27. Control disc
28. Bush (Teflon)
29. End disc
30. Washer
31. Bolt
32. Diaphragm
33. Screw
34. End cover
35. Driver
36. Nut
37. Driver guide
38. Washer
39. Spring
40. Washer
41. Rotary coupling Fig. 5. Fan impellerl EULC code suffix d = 1
Feedback cable
Compressed air
hose
Checking and lubricating of EULC fan
impeller, d = 1
(Every other year from the date when the fan was delive-
red by Fläkt Woods)
1. Release the strap around the flexible connection on the
delivery side of the fan and remove the flexible con-
nection from the fan.
2. Remove the bolts retaining the inspection section of the
guide vane section, and remove the inspection section.
3. Disconnect the hose and the feedback cable from the
centre of the impeller (see Fig. 4).
4. Measure the position of the lock nuts (item 36 in Fig.
5) from the end of each driver (35). Remove the nuts
(36), driver guide (37), washers (38) and springs (39).
5. Release the bolted joint (24, 25, 33) and remove the
end cover (34), together with the rotary coupling (41)
and diaphragm (32). NOTE. On certain fan sizes, two
of the bolts (33) are longer than the others. These bolts
determine the minimum setting of the blade angle and
must therefore be fitted in the correct places.
6. Lubricate the blade bearings through the grease nipple
(8). Fill until the grease seeps out at the seal (22). Use
the same type of grease as for the shaft bearings.
7. Examine the bearings of the links (18). If wear or play
is detected, replace the links.
8. Remove the rotary coupling (41) and fit a new coup-
ling.
9. Also fit a new diaphragm (32) together with the end
cover (34) and tighten the bolted joint (24, 25, 33).
NOTE. This bolted joint must be tightened uniform-
ly all round, in order to avoid run-out of the rotary
coupling (41).
10. Fit the springs (39), washers (38), nuts (36) and dri-
ver guide (37).
11. Make sure that the positions of the lock nuts (36) are
the same as before dismantling.
12. Check the radial run-out of the rotary coupling (41).
The maximum permissible total run-out is 0.6 mm.
13. Fit the feedback cable and connect the hose to the
centre of the impeller as shown in Fig 4.
14. Check that the control disc does not tilt and become
jammed in the outer end position.
15. Fit the inspection section of the guide vane section.
Fit the flexible connection into place and clamp it in
position.
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 4 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
1. Blade
2. Screw
3. Screw
4. Washer
5. Shield
6. Screw
7. O-ring
7a. Nut
8. Grease nipple
8a. Counterweight
9. Blade mounting
9a. Washer
10. Seal
11. Peg
12. Spring
13. Blade spindle
14. Thrust bearing
15. Nut
15a. Bolt
16. Screw
17. Washer
18. Link
19. Bolt
20. Nut
21. Safety ring
22. Seal
23. O-ring
24. Nut
25. Washer
26. Hub
27. Control disc
28. Bush (Teflon)
29. End disc
30. Washer
31. Bolt
32. Bolt
33. Bolt
34. End cover
35. Bolt
36. Washer
37. Bush
38. Cover
39. O-ring
40. Control bearing
41. Driver
42. Nut
43. Washer
44. Nut
45. Link mounting
46. Link bearing
47. Nut
Fig. 7. Fan impeller EULC code suffix d = 2
Fig. 6. EULC code suffix d = 2
Turnbuckle
Crank
Control rod
Link
48. Link
49. V-ring
50. Grease nipple
51. Washer
52. Bolt
53. Driver Guide **)
**) Not fitted to certain variants
Checking and lubricating of EULC fan impeller, d = 2
(Every other year from the date when the fan was delivered
by Fläkt Woods)
1. Release the strap around the flexible connection on the
delivery side of the fan and remove the flexible connec-
tion from the fan.
2. Remove the bolts retaining the inspection section of the
guide vane section, and remove the inspection section.
3. Remove the links (48) shown in Fig. 6 and 7.
4. Measure the positions of the lock nuts (item 42 in Fig. 7)
from the end of each driver (35). Remove the nuts (42),
and the driver guide (53).
5. Release the bolted joint (24, 25, 33) and remove the end
cover (34), together with the control bearing (40).
NOTE. On certain fan sizes, two of the bolts (33) are
longer than the others. These bolts determine the mini-
mum setting of the blade angle and must therefore be fit-
ted in the correct places.
6. Lubricate the blade bearings through the grease nipple
(8). Fill until the grease seeps out at the seal (22). Use the
same type of grease as for the shaft bearings.
7. Replace the bearing unit for the control mechanism by
releasing the bolted joint (32, 43, 44) and pressing out
the whole unit. NOTE the V-ring on the outside of the
end cover.
A complete set of spare parts consisting of items 32–40,
43–45, 49 and 50 can be ordered from Fläkt Woods. (See
FPMC-99-20 and FPMC-99-15-1/2 in the spare parts
catalogue.
8. Examine the bearings of the links (18). If wear or play is
detected, replace the links.
9. Fit the end cover (34) with the control bearing (40), and
tighten the bolted joint (24, 25, 33).
10. Fit the lock nuts (42) and the driver guide (53).
11. Check that the positions of the lock nuts (42) are the
same as before dismantling.
12. Check the radial run-out of the link mounting (45).
The maximum permissible total run-out is 0.6 mm.
13. Fit the links (48).
N.B. If the actuator is fitted, run it between the limits of
its travel to check the mechanical maximum and mini-
mum limits of the fan blade angle. Do this with the con-
trol rod disconnected. Use the turnbuckle and the crank
shown in Fig. 6 to carry out any adjustments.
N.B. Adjust the actuator so that the limit switches trip
before the blades have reached their mechanical stops.
14. Fit the inspection section of the guide vane section. Fit
the flexible connection into place and clamp it in posi-
tion.
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 5 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Fan impeller with manually adjustable blades
(Adjustment cannot be carried out while the
fan is running.)
1. Blade
2. Screw
3. Screw
4. Washer
5. Shield
6. Seal
7. Blade spindle
8. Blade mounting
9. Hub
10. End disc
11. Washer
12. Bolt
Fig. 8
To reset the blade angle, proceed as follows:
1. Remove the flexible connection and the inspection sec-
tion of the guide vane section.
2. Back off the screws (item 2 in Fig. 8).
3. Set the blades to the required angle as shown in Fig. 9.
4. Tighten the screws (item 2 in Fig. 8).
5. Fit the inspection section of the guide vane section.
6. Fit the flexible connection.
Under normal circumstances, the fan impeller needs no
special maintenance.
Fig. 9. Measuring the blade angle
α
Direction of rotation
Blade cross-section
at root
Hub
Direction of
air flow
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 6 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Overhauling the EULC fan impeller, code suffix d = 1
(Fig. 4 and 5)
After a longer period of operation, the fan impeller may
need a thorough overhaul, which should be carried out
by Fläkt Woods.
To remove the EULC fan impeller, d = 1
1. Release the strap around the flexible connection on the
delivery side of the fan and remove the flexible connec-
tion from the fan.
2. Remove the bolts retaining the inspection section of
the guide vane section, and remove the inspection sec-
tion.
3. If better accessibility is required, disconnect the hoses
from connections A and C of the positioner, and the
hose and feedback cable from the centre of the impel-
ler (see Fig. 4).
4. Remove the bolts securing the guide vane unit to the
fan casing and remove the guide vane unit.
5. Remove the lock nuts (item 36 in Fig. 5), the driver
guide (37), washers (38) and springs (39).
6. Release the bolted joint (24, 25, 33), and remove the
end cover (34) and the diaphragm (32).
7. Remove the bolt (31), washer (30) and end disc (29).
8. Fit the extractor tool to the hub as shown in Fig. 10
for an impeller with a hub diameter of 500 or 630
mm, and as shown in Fig. 11 for an impeller with a
hub diameter of 800 mm. Remove the impeller.
Fig. 11
Fig. 10
340
160
M 16
To fit the EULC fan impeller, code suffix d = 1
1. Remove the lock nuts (item 36 in Fig. 5), driver
guide (37), washers (38) and springs (39).
2. Release the bolted joint (24, 25, 33) and remove the
end cover (34) and diaphragm (32).
3. Apply a thin coat of molybdenum disulphide (MoS2)
or lubricating grease to the shaft end and to the bore
of the fan hub.
4. Fit the impeller onto the shaft. Fit a press tool into
the tapped hole in the shaft end and press the impel-
ler onto the shaft.
5. Fit the end disc (29), washer (30) and bolt (31).
6. Fit the end cover (34) with the rotary coupling (41)
and diaphragm (32), and tighten the bolted joint (24,
25, 33).
NOTE. This bolted joint must be tightened uni-
formly all round, in order to avoid run-out of the
rotary coupling (41).
7. Fit the springs (39), washers (38), nuts (36) and dri-
ver guide (37).
8. Check that the positions of the lock nuts (35) allow
the blade angle to be set to a maximum (see Fig. 9).
Check that the lock nuts have been threaded on by
equal amounts, so that the control disc will not tilt
and become jammed in to maximum blade angle.
9. Check the radial run-out of the rotary coupling (41).
The maximum permissible total run-out is 0.6 mm.
10. Fit the large part of the guide vane unit. Carefully
centre the centre section in relation to the impeller
hub and tighten the bolted joint at the fan casing.
11. Fit the feedback cable and connect the hose to the
centre of the impeller as shown in Fig. 4, and connect
the hoses to the connections of the positioner as
shown in Fig. 12.
12. Check that the control disc does not tilt and become
jammed in the outer end position.
13. Fit the inspection section of the guide vane section.
Fit the flexible connection into place and clamp it in
position.
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 7 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Overhauling the EULC fan impeller, code suffix d = 2
(Fig. 6 and 7)
To remove the fan impeller
1. Release the strap around the flexible connection on the
delivery side of the fan and remove the flexible connec-
tion from the fan.
2. Remove the bolts retaining the inspection section of
the guide vane section, and remove the inspection sec-
tion.
3. Remove the links (48) as shown in Fig. 7.
4. Remove the bolts from both ends of the control rod.
5. Release the bolted joint retaining the guide vane unit
on the fan casing and remove the guide vane unit
together with the control rod.
6. Remove the lock nuts (42) and the driver guide (53).
7. Release the bolted joint (24, 25, 33) and remove the
end cover (34), together with the control bearing.
8. Remove the bolt (31), washer (30) and end disc (29).
9. Fit the extractor tool to the hub as shown in Fig. 12
for an impeller with a hub diameter of 500 or 630
mm, and as shown in Fig. 13 for an impeller with a
hub diameter of 800 mm. Remove the impeller.
Fig. 13
Fig. 12
340
160
M 16
To fit the EULC fan impeller, code suffix d = 2
1. Remove the lock nuts and the driver guide (53).
2. Release the bolted joint (24, 25, 33) and remove the
end cover (34), together with the control bearing
(40).
3. Apply a thin coat of molybdenum disulphide (MoS2)
or lubricating grease to the shaft end and to the bore
of the fan hub.
4. Fit the impeller onto the shaft. Fit a press tool into
the tapped hole in the shaft end and press the impel-
ler onto the shaft.
5. Fit the end disc (29), washer (30) and bolt (31).
6. Fit the end cover (34) together with the control bear-
ing (40) and tighten the bolted joint (24, 25, 33).
7. Fit the lock nuts (42) and the driver guide (53).
Check that the positions of the lock nuts allow the
blades to be set to the maximum angle (see Fig. 6).
8. Check the radial run-out of the link mounting (45).
The maximum permissible total run-out is 0.6 mm.
9. Fit the large part of the guide vane unit together with
the control rod. Centre the centre section carefully in
relation to the impeller hub and tighten the bolted
joint to the fan casing.
10. Fit the bolts to both ends of the control rod as shown
in Fig. 6.
11. Fit the links (48).
N.B. If the actuator is fitted, run it between the
limits of its travel to check that these are within the
mechanical maximum and minimum limits of the
blade angle. Do this with the control rod disconnec-
ted. Use the turnbuckle and the crank shown in Fig.
6 to carry out any adjustments.
N.B. Adjust the actuator so that the limit switches
trip before the blades have reached their mechani-
cal stops.
12. Fit the inspection section of the guide vane section.
Fit the flexible connection into place and clamp it in
position.
Recommended tools
Our tool kit, which is available to special order, is recom-
mended for service work on the fan.
The tool kit includes a suitable selection of tools (a total
of 24), vernier calliper, feeler gauges, grease gun, 2 pres-
sure gauges, 3 m of plastic hose, nipples and Teflon tape.
Ordering number: FPAC-99-25.
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 8 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Connecting the positioner
(applies only to the EULC with pneumatic control)
Use a 6 mm o.d./4 mm i.d. plastic hose to connect the
positioner as shown in Fig. 14. For particulars of the con-
trol pressure, see the adjacent table. NOTE that only air
of instrument quality may be connected to the positioner.
Air of instrument quality contains particles no larger
than 10 mm and has a dew point of -20°C or below. The
position is preset at the factory so that the blade angle
will be a minimum at a signal pressure of 21 kPa (3 psi)
and a maximum at 105 kPa (15 psi).
Fig. 14
A. 21–105 kPa (3–15 psi) signal
pressure from the controller
B. Output to the impeller
C. Actuating pressure. For pressure necessary,
see the table below (350 kPa max.)
D. Zeroing screw
E. Screw for stroke factor
G. Flapper
H. Feedback arm
J. Feedback cable
Actuating pressure
Size– n = 980 r/min n = 1470 r/min
hub Nbr. of blades d = Nbr. of blades d =
b–c 8 8 9
EULC – actuating pressure necessary, kPa
0–5
5–5
1–5 120 200 –
6–5
2–5
7–5
3–5
8–5 150 350 –
4–5
9–5
1–6
6–6
2–6
7–6 150 350 –
3–6
8–6
4–6
9–6
3–8
8–8 – – 250
4–8
9–8
Adjusting the positioner
1. Set the signal pressure at tapping A to 21 kPa (3 psi).
2. Adjust zeroing screw D so that when the blades are at
minimum angle, they will start to open at 21 kPa (3
psi) when the signal pressure is increasing.
3. Set the signal pressure at tapping A to 105 kPa (15
psi).
4. Adjust stroke factor screw E so that when the blades
are at maximum angle, they will start to close at 105
kPa (15 spi) when the signal pressure is falling.
Note the following when adjusting the positioner:
a) Follow the instructions in points 2 and 4 above when
the fan is running.
b) The distance between the stroke factor segment and
the stop pad must be 2 mm, measured with the blades
set to the minimum angle.
Caution: The segment must not come into contact
with the stop pad. The positioner may otherwise be
damaged.
c) The travel of the positioner feedback arm should be
symmetrical about the vertical line between the maxi-
mum and minimum angle settings.
d) The feedback cable must run correctly across the guide
pulleys.
Amplification and damping
The positioner includes adjusting screws for the amplifi-
cation and damping. The response of the positioner to a
certain change in signal pressure can be adjusted by
means of the amplification screw. The damping screw is
used to adjust the output pressure of the positioner and
thus the response speed of the actuator. The amplifica-
tion and damping are preset at the factory and need not
normally be adjusted. If adjustment is carried out, the
zero point and stroke factor must also be re-adjusted.
Functional check
Check the operation of the positioner as follows:
1. Disconnect the hose from connection B.
2. Remove the positioner cover.
3. Make sure that there is actuating pressure at connec-
tion C.
4. Move the flapper between the nozzles in a downward
direction, and air should then flow from connection B.
5. Move the flapper in the opposite direction, and the air
flow should then cease.
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 9 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Inverse action of the positioner
The positioner used for EULC fans, d = 1, is direct-
acting, i.e. the blade angle increases with increasing pres-
sure to the positioner. If inverse action is required, the
positioner can be modified (see Fig. 15).
1. Remove the positioner, together with its bracket and
air connections, and disconnect the cable.
2. Remove the torsion spring at the rear of the positioner
and replace it by spring FSAC-99-10-2.
3. Secure the positioner through the two holes located
250 mm below the original mounting holes, and turn
the positioner through 180°, so that the feedback arm
points upwards.
4. Connect the cable and air connection and turn the
reconnection plate F to position U.
5. Adjust as described on the preceding page, but make
sure that the blades close on an increase in signal pres-
sure and open on a decrease in signal pressure.
Fig. 15. Positioner fitted for inverse action
A. Signal pressure from controller, 21–105 kPa (3–15 psi).
D. Zeroing screw
E. Screw for stroke factor
F. Reconnection plate
Recommended spare parts for the EULC, d = 1
1 rotary coupling (item 41 in Fig. 5) per fan
1 set of links (18) (quantity same as number of blades)
1 diaphragm (32) per fan
1 rubber ring for shaft coupling (applies to Arrangement
7)
1 positioner for every four fans
Recommended spare parts for the EULC, d = 2
1 control assembly (items 32 + 35–40 and 43–45, 49 and
50 in Fig. 7 per fan.
1 set of links (18) (quantity same as number of blades)
1 rubber ring for shaft coupling (applies to Arrangement
7)
If the system includes a larger number of EULC fans, it
may be advisable to increase the number of spare parts by
keeping in stock items such as complete impellers,
motors, actuators, shaft bearings and shaft couplings.
Touching-up paint
The fan is painted at the factory with quick-drying,
alkyd-based primer and top coat, International
Primertäck 42 866 HB. The colour is NCS 3060-R80B.
The same paint type should be used for all touching-up.
EULC Axial-flow fan
Fläkt Woods 3183 GB 03.01 10 Specifications are subject to alteration without notice
EU Air Handling Unit MAINTENANCE
Fitness test
Measured values
Motor current..........................................................A
Blade Pitch ...............................................................°
Control signal, d = 1/d = 2 .........................kPa/V/mA
Actuating pressure, d = 1......................................kPA
Vibration in the bearings
Specified values
Total pressure .........................................................Pa
Air flow ..............................................................m3/s
Max. blade pitch.......................................................°
Fan speed.............................................................rpm
Horizontal Vertical Axial, Foot, vertical arr
mm/sek RMS mm/sek RMS mm/sek RMS R T A
1
2
3
4
Condition of the bearings
Temp °C Noise Other
1
2
3
4
Other checkpoints
Control: Lubrication: Anti-vibration mountings:
d = 1 feedbakc cable: OK/Adjust Motor bearings Condition: OK/Replace
d = 2 control rod: OK/Adjust Shaft bearings Fasteners: OK/Remarks
Other accessories:
Other ..................................
...........................................
...........................................
Carried out on:
Sign.:
(Skiss)
/
