Service Guide

12
8. Sound pressure level
Slim duct type running noise
(1) Testing illustrate:
Unit
Air
The auxiliary air duct
The auxiliary air duct
Outlet side
1.4m
Sound level meter
Testing position just below the central of the unit
Note:
The length of the auxiliary air duct is 2m
(2) Testing condition:
a. Unit running in the standard condition
b. Test in the semi-anechoic chamber
c. Noise level varies from the actual factors such as room structure, etc.
(3) Octave band level:
MVAD007-009MV2AA
Octave band sound pressure level dB
70
60
40
30
20
10
63 125 250 500 1000 2000 4000 8000
50
Limit of
audible
continuous
noise
Octave band center frequency (HZ)
Octave band sound pressure level dB
70
60
40
30
20
10
63 125 250 500 1000 2000 4000 8000
50
MVAD012MV2AA
Limit of
audible
continuous
noise
Octave band center frequency (HZ)