Panasonic Urban Multi MX1 Series Manual page 82

Appendix (Check Points in Installing UM Series)
8.1.3 Calculating Operating Noise
When two or more units are running at the same time, the amount of operating noise they produce rises.
The total amount of noise produced can be obtained ahead of time with Chart 4.
Sample calculation 1
L
corrective value is 2.5, therefore 50 + 2.5 = 52.5 dB.
Sample calculation 2
When sounds of 40 dB, 38 dB, 37 dB and 40 dB are placed in order of magnitude, we obtain the following:
40 dB, 40 dB, 38 dB, 37 dB
To start, the difference between 40 dB and 40 dB is 0, therefore we take a corrective value of 3dB and
obtain 40 + 3 = 43 dB. The compounded sound of 43 dB and 38 dB has a 5.0 dB difference, thus a
corrective value of 1.2 dB, which gives us 44.2 dB from 43 + 1.2. In the same manner, the corrective value
for 44.2 dB and 37 dB is approximately 0.7 dB, or in other words, 44.2 + 0.7 = 44.9 dB.
82
and L are given as compounded sounds of 50 and 49 dB respectively. Since L
1 2
PACD011001G2 / PACD011004G3
– L = 50 – 49 = 1, the
1 2
Urban Multi Inverter "MX1" Series