Engineering Manual

Acoustic Data
• Measurement taken 4.9′ away from the unit.
• 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.
Figure 160: Sound Pressure Level Measurement Location.
Model No.
Sound Pressure Levels (dB[A]) (Cooling and Heating)
High Fan Speed
Medium Fan
Speed
Low Fan Speed
LMCN077HV 31 27 24
LCN097HV4
36 33 30
LCN127HV4
38 35 32
LMCN185HV 38 37 34
Table 70: Sound Pressure Levels (dB[A]).
Figure 161: LMCN077HV and LCN097HV4 Sound Pressure Level Diagrams.
4.9 ft.
Ceiling
Microphone
FOUR-WAY CEILING-CASSETTE INDOOR UNITS
Octave Band Sound Pressure Level (dB re 20Pa)
Octave Band Center Frequency (Hz)
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
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)
LMCN077HV LMCN097HV
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)
LCN097HV4
CEILING-CASSETTE | 121
Four-Way Ceiling-Cassette
Due to our policy of continuous product innovation, some specications may change without notication.
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