Systemair katalog - page 9

Variable air volume controllers
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9
Diagram
Airflow
(m
3
/h)
Lw dB(A)
50 Pa
100 Pa
150 Pa
200 Pa
15
25
29
32
35
30
26
31
35
38
45
27
33
36
39
60
32
37
39
42
75
32
37
40
42
90
32
38
41
44
120
30
34
39
42
150
33
37
41
45
180
34
40
44
47
210
34
40
42
44
240
35
41
44
47
270
37
43
45
49
300
33
37
42
45
Size
L (mm)
D1 (mm)
D2 (mm)
80
55
76
73
100
60
96
93
125
90
120
117
160
89
456
147
RDA
Self regulating constant air volume
Function
The air flow regulator RDA is an element placed inside the
duct in order to obtain a constant flow within a pressure
range from 50 to 200 Pascal. It is used in ventilation or
air conditioning systems for supply or return air. The air
is forced to pass through predetermined space in which
a flap can change the position according to the specified
air flow. The flap is attached on to a calibrated spring and
therefore no auxiliary power is needed.
Design
RDA is made from plastic material (polystyrene) classified
M1 in grey colour. Maximum temperature is 60°C.
Mounting
RDA is inserted directly into a horizontal or vertical circular
duct. It is fixed and kept airtight by a lip seal. Arrow indi-
cates the airflow. If the unit is placed in supply duct, the
space between the diffuser and the unit must be at least
3x diameter of the duct. If used for return air the space
must be 1x diameter of the duct.
Ordering Code
RDA-80/15
80 - size
15 - air volume
Air flow in m
3
/h
PT, Differential pressure in Pa
Flow regulators are characterized by their noise level in
dB(A).
Tests reports : CETIAT 2315002 for air flow RD Ø80 to RD
Ø125 mm
Dimensions
1
2
3
3
2
1
D1
D2
D2
D1
L
L
*spacer
= special body without spacers
1* air flow = special shims with air flow ref.
1,2,3,4,5,6,7,8 10,11,12,13,14,15,16,17,18,19,...87
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