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IRL
2.6 Generation of noise
The noise generated by a blower is not constant over the whole
performance curve (see diagrams below).
MD 10
50 Hz
0,5
1
1,5
2
2,5
3
30
60
90
120
150
180
Volumetric flow rate V
MD 10
60 Hz
0,5
1
1,5
2
2,5
3
30
60
90
120
150
180
Volumetric flow rate V
MD 14
50 Hz
2
4
6
8
120
240
360
480
Volumetric flow rate V
MD 14
60 Hz
2
4
6
8
120
240
360
480
Volumetric flow rate V
In certain unfavourable cases a sound-absorbing device may be
required (measurements by the operator are recommended).
Sound-absorbing measures are to be carried out by the opera-
tor so as not to exceed the legally permitted peak values at the
work places near the blower.
3 Installation
3.1 Transport
G Check all parts for damage during transport before install-
ation and starting of operation.
G Do not store the blower unprotected in the open (protect
against moisture).
G Attach hoist securely. Only use hoists and load suspension
devices with sufficient load-carrying capacity.
3.2 Installation, assembly
G Install the blower horizontally and weather-protected.
G Do not subject the blower to any vibrations or shocks.
G Blower with foot base; to be secured tightly at site of
operation on solid, even ground.
G Open intake and discharge ports are to be protected by wire
guards in accordance with DIN EN 294.
G Ensure adequate motor ventilation. Permissible ambient
temperatures for:
Standard motors –20° C to +60° C
with a rated voltage (max. ± 10 % voltage tolerance) and a
rated frequency of 50 Hz or 60 Hz
Special-purpose motors –20° C to +40° C
multi-voltage range (50 Hz and/or 60 Hz)
FU/FUK series
UL approval
6
dB(A)
80
75
70
65
3,5
4
4,5
5
5,5
m
3
210
240
270
300
330
m
3
.
dB(A)
80
75
70
65
3,5
4
4,5
5
5,5
m
3
210
240
270
300
330
m
3
.
dB(A)
80
70
60
10
12
14
16
m
3
/min
600
720
840
960
m
/h
3
.
dB(A)
80
70
60
10
12
14
16
m
3
/min
600
720
840
960
m
3
/h
.
3.3 Electrical connection
☛
Note!
The work described under this section may be
executed by a qualified electrician only. Connections
to be carried out in accordance with wiring diagram
in terminal box and relevant local regulations.
As drive motor for the D blower a three phase a.c. motor is
fitted, the E blower with a single phase a.c. motor with
operating capacitor.
G The drive motor has to be safeguarded by a motor circuit-
/min
/h
breaker.
G The safety earth terminal can be found in the terminal box.
3.3.1 Connection of three phase units
/min
/h
L1
L2
L3
(L3)
(L1)
-configuration
(lower voltage)
Checking direction of rotation
Start operation of blower. The direction of rotation of the impel-
ler must correspond to the directional arrow on the housing. If
the direction of rotation is incorrect, the two connecting wires
L1 and L3 have to be interchanged.
3.3.2 Connection for three-phase ventilators
to single-phase supply with capacitor
L1
N
Clockwise
Connection of single phase units
L1
N
Clockwise
4 Operation
If the rated current of the drive motor is exceeded during opera-
tion, voltage and frequency of the power supply should be
checked and compared with the data on the blower rating plate.
If the blower cannot be operated over the whole range of the
characteristic curve, an overload of the motor may occur in
case of insufficient system resistance (excessive current con-
sumption). The volumetric air flow should be reduced in this
case by means of a throttle valve fitted on the intake or dischar-
ge side.
The blower must not be subjected to vibration or shock loads.
L1
L2
L3
(L3)
(L1)
-configuration
(higher voltage)
L1
N
Anti clockwise
L1
N
Anti clockwise
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