Service manual

5
NOISE CRITERIA CURVES
4
NOISE CRITERIA CURVES
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
High
46
SPL(dB
(A)) LINE
FAN SPEED
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
High
44
SPL(dB
(A)) LINE
FAN SPEED
MCF-A12WV -
E1
MCF-A18WV -
E1
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
High
48
SPL(dB
(A)) LINE
FAN SPEED
INDOOR UNIT
WALL
1m
1m
MICROPHONE
MCF-A24WV -
E1
OB338A--1.qxp 04.4.5 11:56 AM Page 5