Service manual

5
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :DB35: WB24:
Heating :DB 7: WB 6:
MUH-GA25VB
MUH-GA35VB
COOLING
FUNCTION
49
HEATING
SPL(dB
(A)) LINE
OUTDOOR UNIT
MICROPHONE
1m
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :DB35: WB24:
Heating :DB 7: WB 6:
MUH-GA20VB
COOLING
FUNCTION
47
HEATING
SPL(dB
(A)) LINE
OB387B-1.qxp 07.5.23 2:48 PM Page 5