Mitsubishi Electric SLZ Series Technical & Service Manual page 7

NOISE CRITERION CURVES
SLZ-KA25VAL3.TH(-ER)
SLZ-KA35VAL3.TH(-ER)
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125
BAND CENTER FREQUENCIES, Hz
CEILING
MICROPHONE
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than the indicated level in actual use due to surrounding echoes. The sound level can be higher
by about 2 dB than the indicated level during cooling and heating operation.
OCH564
NOTCH SPL(dB)
High 38
Medium 33
Low 29
250 500 1000 2000 4000
UNIT
1.5m
<50Hz>
SLZ-KA50VAL3.TH(-ER)
LINE
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
10
8000
63
7 7
NOTCH
High
Medium
Low
125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
<50Hz>
SPL(dB) LINE
39
34
30
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000 8000