Engineering Manual

A-202
10
NOISE CRITERION CURVES
10-1. INDOOR UNIT
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING(SHi)
SPL(dB(A))
LINE
HEATING(SHi)
43
43
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
MSZ-GL09NA
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
SPL(dB(A))
LINE
45
43
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
MSZ-GL12NA
SPL(dB(A)) LINE
49
48
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
MSZ-GL18NA
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
SPL(dB(A))
LINE
49
46
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
MSZ-GL15NA
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NOTCH
COOLING(SHi)
HEATING(SHi)
NOTCH
COOLING(SHi)
HEATING(SHi)
NOTCH
COOLING(SHi)
HEATING(SHi)
NOTCH