Technical data
Precision Air Conditioning
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Precision Air Conditioning
Technical Manual : 6258867 F 07/2012
75
Sound Data - Condensing Units CUS 3 - 30D
METHOD OF SOUND MEASUREMENT
All sound data quoted has been measured in the third-octave band limited values, using
a Real Time Analyser calibrated sound intensity meter in accordance with
BS EN ISO9614 Part 1 : 1995.
Measurement of Sound
Data
All Sound Power Levels quoted are calculated from measured sound intensity according
to BS EN ISO9614 Part 1 : 1995.
Semi Hemispherical
CUS 3 - 12
Sound Pressure Levels are calculated from sound power using the semi-hemispherical
method where the noise source is in junction with 2 boundaries i.e. the floor and 1 wall.
CUS 30D
Sound Pressure Levels are valid in free field conditions, where a reflective base, such
as a roof is found.
CUS 3 - 4 CUS 5 - 30D
CONDENSING UNITS - CUS 3 - 12
Frequency (Hz) dB
Sound Measurement Overall
dB(A)
63
125
250
500
1000
2000
4000
8000
CUS3
Power 71
80
79
71
67
66
60
55
47
Pressure @ 10m 43
52
51
43
39
38
32
27
19
CUS4
Power 73
81
79
75
72
66
64
57
48
Pressure @ 10m 45
53
51
47
44
38
36
29
20
CUS 5 - 6
Power 80
80
81
79
78
76
68
61
54
Pressure @ 10m 52
52
53
51
50
48
40
33
26
CUS 6.5 - 7.5
Power 81
81
79
82
79
77
72
65
58
Pressure @ 10m 53
53
51
54
51
49
44
37
30
CUS 8.5 - 12
Power 82
88
85
81
80
77
71
64
55
Pressure @ 10m 54
60
57
53
52
49
43
36
27
CUS30D
Power 86
88
81
83
83
82
78
72
64
Pressure @ 10m 58
60
53
55
55
54
50
44
36
1 Levels are quoted with the condenser fan running at full speed. Under normal operating conditions (ambients up to 35°C) noise levels will be
reduced by 3 - 4 dB.
OUTDOOR UNIT