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Supply fan Airflow measurement option
The airflow measurement option when selected is
associated with an air differential pressure sensor which
measures the pressure difference before the inlet nozzle
Sound power levels
and inside the inlet nozzle.
Unit air flow can be calculated on the basis of the
Discharge
differential pressure (difference in pressure of the static
pressures) in keeping with the following equation:
Measurement conditions:
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
Qv in [m 3 /h] and ∆p in [Pa]
long) fixed to its discharge opening.
Fan
Unit
speed
N - number of fans
1
k - takes into account the specific nozzle characteristics.
FWD 08
2
3
1
FWD 10
2
Connection on the unit side is acomplished via a pre-
3
mounted T tube connector. This tube connector is suited
1
FWD 12
for pneumatic hoses with an internal diameter of 4 mm.
2
3
1
FWD 14
2
3
1
FWD 20
2
3
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
Fan
Unit
speed
1
FWD 08
2
3
1
FWD 10
2
k factors:
3
1
Fan diameter
400
FWD 12
2
3
k-factor
188
1
FWD 14
2
3
1
According to the option chosen, airflow or fan RPM can
FWD 20
2
be read directly on the optional display or should be
3
determined by connecting a pressure drop meter to the
pre mounted T connector.
Setup is -20%/+30% variation versus factory setting
(190m 3 h-1/kW @ 250 Pa).
RT-SVX060D-GB
UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125
250
500
55
50
42
57
54
47
58
57
50
57
51
45
58
54
48
60
58
50
57
51
45
58
54
48
60
58
50
56
62
50
61
66
55
63
69
58
57
63
51
61
66
55
63
69
58
Power level in dB(A), per Hz frequency band
125
250
500
56
55
55
63
62
60
66
65
63
62
58
55
66
63
60
70
67
63
62
58
55
450
500
66
63
60
70
67
63
240
281
66
65
65
73
72
69
78
76
73
68
72
64
76
76
68
78
79
71
Refrigerant leak detector R454B
Refrigerant leak detector R454B is supplied and wired
in each unit selected with refrigerant R454B. Along
with this option, each unit selected with R454B is also
equipped by default by an airflow rate sensor from
security point of view.
Refrigerant leak detector is installed between indoor coil
and indoor fans on the bottom, close to the door panel
which may have access to the indoor fans. See pictures
below.
The sensor is set to LFL (Lower Flammable Limit) about
0.5 % (500 ppm) at 23°C ambient temperature and RH
50%. Value of LFL is not adjustable
1000
2000
37
37
40
30
42
32
42
34
45
38
48
40
42
34
45
38
48
40
48
39
53
47
56
50
49
40
53
47
56
50
1000
2000
53
46
60
53
62
56
58
51
62
56
65
59
58
51
62
56
65
59
65
57
71
64
75
69
64
56
71
65
74
69
Installation
Overall power
4000
8000
dB(A)
31
30
46
38
40
50
40
43
53
33
28
48
39
35
51
42
39
54
33
28
48
39
35
51
42
39
54
38
36
56
46
45
60
50
49
63
39
37
57
46
45
60
50
49
63
Refrigerant leak
detector R454B
Overall power
4000
8000
dB(A)
45
42
57
53
53
64
55
57
67
48
44
61
55
52
66
59
57
69
48
44
61
55
52
66
59
57
69
50
46
68
59
57
74
64
63
78
52
50
69
61
61
75
66
66
78
Refrigerant leak
detector R454B
11
23
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