Fläkt Woods 3227 GB 2008.04 1 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Fan EULK, c = 2, 4
Installation alternatives
Connection of outlet duct
Connection of the duct to the outlet from the fan unit
must take place in accordance with one of the examples
in Fig. 2.
Important!
The unit must not be allowed to support the weight of
the duct.
Fig. 2a Fig. 2b Fig. 2c
The duct may be connected in accordance with the fol-
lowing alternatives:
A.Via a transition piece fixed to the casing with self-tap-
ping screws. The duct connection is then made with a
PG joint or a flanged union. Fig. 2a.
B.Via a flexible sleeve coupling fixed to the casing with
self-tapping screws. The duct connection is then made
with a PG joint or a flanged union. Fig. 2b.
C.Via a direct edge-mounted duct provided with sheet
metal angles at the corners. Fig. 2c.
Transition piece Flexible sleeve Counterflange Duct
EULZ-62 coupling EULZ-63
EULZ-61
Electrical connection
The fan motor must always be controlled by a frequency
converter, which permits the possibility of regulation and
soft starting.
N.B. The fan must not be started directly.
From the rating plate, determine the MAXIMUM fre-
quency to which the fan motor may be regulated. Under
no circumstances must the fan motor be supplied at a
higher frequency.
xxx xxxx xxxxxx xxx
xxxx xxxxxxxx xx
xxx xxxx xxxxx
MAX frequency
Electrical connection must be performed by a quali-
fied electrician.
The cable between the terminal box of the motor and the
frequency changer must be screened. A safety cut-out
switch must be installed between the electricity mains
supply and the frequency changer.
The safety cut-out switch is fitted close to the fan inspec-
tion door.
Before working on the fan, the fan must be switched
off with the safety cut-out switch.
Fig. 1
Protective net EULZ-64
Counterflange EULZ-63
Flexible sleeve coupling
EULZ-61
Transition piece
EULZ-62
Connection accessories
for outlet:
Internal contact protection,
outlet EULZ-36
Door lock EULZ-14
Internal contact
protection, inlet
EULZ-37
Fig. 3
Protective net for door
EULZ-38
Fan EULK, c = 2, 4
Fläkt Woods 3227 GB 2008.04 2 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Electrical connection, continued.
Drill a hole for the cable conduit entry into the unit casing
at a suitable point in the fixed panel. Fig. 4 and Fig. 5.
The cable must not be routed through the inspection
door. The screwed fitting for the cable can be executed as
shown in Fig. 6.
Fig. 4
Fig. 5 Fig. 6
EULK can be supplied with an external, factory-installed
frequency converter connected to the terminal box of the
motor with a screened cable; accessory STRZ-54. A safety
isolator with cabling to the frequency converter is also
available as an accessory; STRZ-65.
NOTE. STRZ-65 can only be ordered as a complete
assembly with STRZ-54.
EULK can also be supplied with a factory-installed
screened cable for an external screened terminal box; acces-
sory STRZ-66.
= Fixed panel
Testing before commissioning
– Check for compliance with the EU Machinery
Directive in respect of contact protection. Wherever
the fan unit is accessible from a duct or other function-
al component, the fan unit must be fitted with contact
protection EULZ-36 and/or EULZ-37. Alternatively,
functional components before and after the fan, having
an inspection door, may be fitted with door lock
EUAZ-14. Door protective net EULZ-38 or door lock
can be used as contact protection for the fan unit inspec-
tion door EUAZ-14. See Fig. 1.
– Check that a qualified electrician has issued an
approval certificate prior to commissioning.
– Check that the impeller wheel rotates freely and that no
foreign objects are present which may be sucked in and
cause damage to the fan.
– If the fan is fitted with spring isolators, the transport
brackets must be removed before starting.
Important!
If the fans are not operated for more than 3 months
before or after installation, the fans must be rotated
by hand at regular intervals. If not, the ball bearing
may suffer the following damage; see the illustration.
Belastnings
s
Load-induced
damage
Fan EULK, c = 2, 4
Fläkt Woods 3227 GB 2008.04 3 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
EULK is available with equipment for air flow measure-
ment, “d” = 1 or 3 in the EULK code. The air flow, q, can
be calculated from the following formula using a measure-
ment pressure of ∆p(Pa), and a constant k:
Temperature correction
The flow scale on the display instrument and the above
flow formula are applicable to air at a temperature of
+20°C. At other air temperatures, the flow must be cor-
rected using the formula:
where q = the actual flow through the fan, q20 = the flow
value reading and t = the prevailing temperature in °C.
q = q20 (273 + t)
293 , m3/s
√
Airflow measurement
+–
∆p
Fig. 7
q = (m3/s)
√∆p
1
kx
The measurement pressure, ∆p, which is the difference
between the pressure in the empty part of the fan inlet
and the pressure inside the inlet cone, can be read with a
manometer (pressure range up to 6000 Pa) connected to
2 externally located nipples. The value of the constant k
is shown in the table below.
A flow indicator with a built-in pressure transducer,
STRZ-08, is available as an accessory. STRZ-08, which is
connected via hoses to the external nipples, converts the
measurement pressure into a flow (m3/s) which is indi-
cated on a display and gives an output signal of 0-10 V in
a linear relationship with the flow.
(See instruction for STRZ-08).
Size EULK- k
31-3, 32-2, 33-2, 40-2 11,14
40-3, 41-2, 42-1 8,78
41-3, 42-2, 44-2, 51-1 7,00
50-3, 51-2, 52-1 5,56
51-3, 53-2, 52-2 4,44
53-3, 52-3 3,54
Size EULK- k
20-2 41,09
20-3 34,96
21-2 27,59
21-3, 22-2, 30-2 20,62
30-3, 31-1 17,42
31-2, 32-1 14,87
Fläkt Woods 3227 GB 2008.04 4 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Fan EUL(B,F)
Installation of the frequency converter
Warning: Incorrect installation of the frequency
converter can damage the bearings in the motor.
It is Fläkt Woods' policy to only except claims when
the motor and frequency converter have been
supplied and installed by us.
Damage to the motor will not be accepted when the
motor has been connected to the frequency converter
by an installation engineer not provided by Fläkt Woods.
The frequency converter and the motor must be installed
by a qualified electrician with good knowledge of speed
regulated, drive system installations (frequency converters)
and EMC-safety.
The following recommendations should be seen as a
supplement to the manufacturer's installation instructions.
In those cases where there are differences, the
manufacturer's instructions shall take precedence over the
following; this is due to the warranty undertaking from the
manufacturer.
General
The installation between the motor and the frequency con-
verter should be carried out using screened, unbroken 4-
wire cable intended for EMC-installations for motor opera-
tions, the screen shall have at least 80% optical density, for
example, Nexan’s NCY or Ölflex Classic. The screen shall
have 360º contact with the casing both in the motor and in
the frequency converter to give the maximum contact sur-
face. Safety switches or connection boxes fitted between the
frequency converter and motor are not recommended.
Motor
The cable gland in the motor's outlet box should consist of
an EMC approved cable gland, for example, Miltronic
SKINTOP MS-SC. The screen conductor may only be
connected via EMC unions, not to earth bolts.
Frequency converter
Connection of the screening conductor shall be made via
an EMC approved union in the frequency converter's cas-
ing or by using a clamp intended for this purpose. The
screen conductor must not be connected to an earth bolt.
Connection of the screen conductor
In those cases the screen conductor must be connected to
an earth bolt in the motor or frequency converter, this
should be done so that the impedance is as low as possible,
in these cases, this conductor is limited in length to 5 times
its width. For example, when the screen conductor is 1 cm
wide it must not be longer than 5 cm.
Diverse
Besides this, the following should be observed:
•type of mains supply.
•local regulations and provisions.
•the manufacturer's installation instructions for the fre-
quency converter.
Outputs over 22 kW
In the event of outputs over 22 kW, a symmetrical
screened cable with concentric or in some other way
symmetrically designed protective earth conductor
should be used, please refer to the installation instruc-
tions for the frequency converter for recommendations
concerning these installations.
The screen
should have
360º contact
with the casing
The screen should
have 360º contact
with the casing
Insulating tape
Screen
Casing
Screen Insulating tape
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1
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2
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3
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4
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