Specifications

23 Catalog WMC-4
Sound Data
The following sound pressure ratings are for
measurements one meter from the unit and in
accordance with ARI Standard 575. The ratings
are for the various part loads shown and at the
center bands. Note that there is a considerable
lowering of sound level as the units unload.
Octave band values are flat dB, A weighted values
are dBa. The 25 percent values are with one
compressor running.
Table 2, WMC 145S Sound Pressure (dB),50/60 Hz
Octave Band, Hz Percent
Load
63 125 250 500 1000 2000 4000 8000
A-
Weighted
100
34.58 48.90 56.13 66.51 71.30 69.21 71.42 74.27 78.59
75
34.46 47.85 58.42 65.89 66.91 65.16 68.17 69.96 74.96
50
34.09 47.62 59.54 62.08 62.60 62.66 64.97 63.03 70.88
25
33.32 47.51 55.45 60.34 61.10 60.89 61.13 56.03 67.80
Table 3, WMC 145D/150D, Sound Pressure (dB), 50/60 Hz
Octave Band, Hz Percent
Load
63 125 250 500 1000 2000 4000 8000
A-
Weighted
100
33.6 51.5 58.8 66.4 70.6 74.1 72.5 68.4 78.0
75
30.9 48.8 54.2 61.6 70.3 71.0 68.6 63.3 74.6
50
31.2 47.0 53.2 61.9 66.0 67.7 64.0 57.0 71.0
25
35.1 48.3 56.5 60.8 64.5 65.8 61.2 54.7 69.7
Table 4, WMC 250, Sound Pressure (dB), 50/60 Hz
Octave Band, Hz Percent
Load
63 125 250 500 1000 2000 4000 8000
A-
Weighted
80.9
100
37.6 53.8 60.5 66.5 75.8 71.6 74.2 75.4
77.2
75
36.0 52.6 60.7 67.7 69.4 68.8 71.6 70.8
72.5
50
36.2 50.9 58.5 64.1 64.7 65.9 67.0 62.8
70.5
25
36.2 50.7 56.2 60.4 63.2 64.7 64.9 60.4
Table 5, WMC 290, Sound Pressure (dB), 50/60 Hz
Octave Band, Hz Percent
Load
63 125 250 500 1000 2000 4000 8000
A-
Weighted
81.9
100
37.0 50.4 57.8 66.0 73.4 72.8 76.0 77.7
78.8
75
36.1 49.1 58.1 64.6 70.4 69.0 73.9 74.0
73.2
50
39.7 49.8 57.8 62.7 64.1 64.3 69.1 66.1
70.5
25
40.2 50.8 57.3 60.9 62.5 62.6 65.2 63.1