22
Four-W
ay Ceiling Cassette System Engineering Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©
LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
4.9 ft.
Ceiling
Microphone
Figure 11: Indoor Unit Sound Pressure Level
Measurement Location.
• Measurements taken with no attenuation and units operating at full load normal
operating condition.
• Sound level will vary depending on a range of factors such as construction (acoustic
absorption coefficient) of particular area in which the equipment is installed.
• Sound power levels are measured in dB(A)±3.
• Tested in anechoic chamber per ISO Standard 3745.
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0dB = 20μPa
)
10
20
30
40
50
60
70
80
63
125
250
500 1000 2000 4000 8000
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0dB = 20μPa
)
10
20
30
40
50
60
70
80
63
125 250 500 1000 2000 4000 8000
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
LCN187HV, LCN247HV
LCN367HV, LCN427HV
Figure 12: Four-Way Ceiling Cassette Indoor Unit
Sound Pressure Level Diagrams.
Table 6: Four-Way Ceiling Cassette Indoor Unit Sound Pressure Levels (dB[A]).
Model
Sound Pressure Levels (dB[A])
H
M
L
LCN098HV4
36
33
30
LCN128HV4
38
35
32
LCN187HV
38
36
34
LCN188HV4
41
39
36
LCN247HV
38
36
34
LCN367HV
46
44
43
LCN427HV
46
44
43
ACOUSTIC DATA
Indoor Units
10
20
30
40
50
60
70
80
90
63
125
250
500
1000
2000
4000
8000
Octave Band Center Frequency (Hz)
NC-15
NC-70
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
Sound Pressure Level (dB re 20uPa)
LCN098HV4
Octave band center frequency (Hz)
Sound pressure level (0 dB = 20
µPa)
10
20
30
40
50
60
70
80
63
125
250
500 1000 2000 4000 8000
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
LCN128HV4
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0dB = 20μPa
)
10
20
30
40
50
60
70
80
63
125
250
500 1000 2000 4000 8000
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0dB = 20μPa
)
10
20
30
40
50
60
70
80
63
125 250 500 1000 2000 4000 8000
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
LCN187HV, LCN247HV
LCN367HV, LCN427HV
LCN188HV4