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Fläkt Woods 3195 GB 03.01 1 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
EULC Axial-flow fan
Connection accessories on the outlet
side, items 1–4
1. EULZ-54 air distributor
2. EULZ-52 connection piece
3. EULZ-51 flexible connection
4. EULZ-53 counterflange
Connection to ducting of other unit section
Connection to some other unit section is carried out by
bolting as described in the general instructions.
Connection to the ducting can be carried out in accor-
dance with one of the alternatives below.
The EULZ-51 flexible connection, and EULZ-52 con-
nection piece are delivered fitted to the unit.
The EULZ-53 counterflange is delivered separately
and should be fitted as shown in Figs. 5–6.
The unit can be connected directly to ducting as
shown in Figs. 7–8.
Make sure that the dead weight of the ducts does not
apply a load on the casing.
PG-joint
Fig. 3 Fig. 4
Fig. 7 Fig. 8
Fig. 5 Fig. 6
Collared duct
Flange connection
Flexible
connection
Connection
piece
Flexible
connection
Connection
pieceGasket
Gasket
Gasket
Gasket
Collared duct
Connecting the EULZ-54 air distributor
The EULZ-54 air distributor is normally delivered facto-
ry-fitted to the unit. If it is delivered in unmounted con-
dition, the EULZ-54 should be fitted as shown in Fig.2.
The self-tapping screws, M8 screws and nuts shall be
made of the same material as the casing.
4 self-tapping screws
4 M8 x 20 mm long screws
4 M6M8 nuts
Counter-
flange Counter-
flange
Fig. 1
Fig. 2
EULC Axial-flow fan
Fläkt Woods 3195 GB 03.01 2 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Electrical connections
(to be carried out by an authorized electrical contractor)
Use a rubber-insulated cable for the connection to the
motor, and make sure that the cable is not taut, since it
may otherwise transmit vibrations from the fan casing.
The cable must not be run through the inspection doors.
Use a hole cutter, for instance, to drill a hole for the
cable gland at a suitable point in the casing. A suitable
arrangement of the cable gland is shown in Fig. 9.
Fig. 9
Safety isolating switch
The fan must be equipped with a safety isolating switch
(EULZ-17 for instance). Always isolate the motor before
doing any work on the fan. In addition to opening the
safety isolating switch at the fan, the main isolating swit-
ch must also be opened and locked in the open position.
Guards
The fan conforms to the relevant Swedish industrial
safety regulations concerning guards.
Follow these or similar safety regulations when instal-
ling the fan. An open delivery outlet, for instance, must
be fitted with a protective screen.
For particulars of the installation for the actuators, the
control equipment and the maintenance of the fan, actu-
ators and control equipment, see the separate instructions
included in the supply.
General
The fan is available in two different versions as shown in
Figures 10 and 11.
Arrangement 1: The impeller is mounted directly on the
end of the motor shaft.
Arrangement 7: The impeller is mounted on the interme-
diate shaft, connected to the motor by
means of a flexible coupling.
The impeller is dynamically balanced. Before delivery the
control function and vibration levels, etc. are checked.
The fans can be supplied in two different versions, which
differ in terms of the blade pitch control system.
EULC, code suffix d = 2: Mechanically controlled fan
which can be equipped with an external, double-acting,
electro-mechanical actuator. The control mechanism of
the impeller is actuated by a linkage.
EULC, code suffix d = 1: Pneumatic, single-acting actua-
tor incorporated 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.
Power supply to the motor
Connect the power supply cable directly to the terminal
box of the motor. In the case of an Arrangement 1 fan,
run the cables through an opening in the bottom part of
the guard, on the right-hand or left-hand side.
Fig. 11. Arrangement 7
Fig. 10. Arrangement 1
EULC Axial-flow fan
Fläkt Woods 3195 GB 03.01 3 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
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. 12. 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).
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.
Fig. 12
A. 21–105 kPa (3–15 psi) signal pres-
sure from the controller
B. Output to the impeller
C. Control pressure. For pressure
necessary, see the table above (350
kPa max.)
D. Zeroing screw
E. Screw for stroke factor
G. Flapper
H. Feedback arm
J. Feedback cable
Control pressure
Size–n = 980 r/min n = 1470 r/min
hub Nbr. of blades d = Nbr. of blades d =
b–c8 89
EULC – control 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
EULC Axial-flow fan
Fläkt Woods 3195 GB 03.01 4 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Functional check
Check the operation of the positioner as follows:
1. Disconnect the hose from tapping B shown in Fig 12.
2. Remove the positioner cover.
3. Check that control pressure is supplied to the posi-
tioner at tapping C.
4. Move the flapper between the nozzles in a downward
direction, and air should then flow from tapping B.
5. Move the flapper in the opposite direction, and the air
flow should then cease.
Inverted operation of the positioner
The positioner for the EULC, code suffix d = 1 is instal-
led so that it is direct-acting, i.e. an increase in signal
pressure to the positioner results in an increase in the
blade angle. However, if inverted action is required, the
positioner can be modified (see Fig, 13).
1. Remove the positioner with its bracket and air connec-
tions, and remove the cable.
2. Remove the torsion spring from the rear of the positio-
ner and replace it with spring FSAC-99-10-2.
3. Secure the positioner to the two holes located 250 mm
below the original mounting holes, and turn the posi-
tioner through 180°C so that the feedback arm points
upwards.
4. Fit the cable and air connection, and turn change-over
plate F to positon U.
5. Adjust as described on page 3, but ensure that the bla-
des close on an increase in signal pressure and open on
a fall in signal pressure.
Fig. 13. Positioner installed for inverted operation
A. 21–105 kPa (3–15 psi) signal pressure from the controller
D. Zeroing screw
E. Screw for stroke factor
F. Change-over plate
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 grease 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.
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