System Design
6. Sound-proofing measures
D-29
(6) Converting from octave band levels to overall A weighting
Table 1. Correction factor for converting from octave bands to A weighting
Octave band
Hz
63
125
250
500
1000
2000
4000
8000
Conversion factor
dB
-
26
-
16
-
9
-
3 0 +1 +1
-
1
Using the above table, the A weighting is obtained by adjusting the calculated value for each band by its
conversion factor. These values are then combined in order of magnitude, as shown in the following example, to
obtain the overall A weighting.
<Calculation example>
The octave band levels (dB) are obtained from the frequency analysis table (the operating sound level at the
center frequency of each octave band). These values are corrected with the A weighting correction factor to
obtain the A weighting. The following calculation determines the operating sound level.
Octave
band
Hz 63 125 250 500 1000
2000
4000
8000
Octave band
level
dB 69 66 62 59 56 49.5 45 41.5
Conversion correction
f t
dB
-
26
-
16
-
9
-
3
0 +1 +1
-
1
A
weighting dB(A)
43 50 53 56 56 50.5 46 40.5
These A-weighting values are combined one-by-one in order of magnitude (in the same away as combining
different operating sounds).
56 56 53 50.5 50 46 43 40.5
The overall A weighting is thus calculated to be 60.95 dB(A).
(7) Designing sound-proofing countermeasures
<Calculation example>
In the installation drawing at the right, a scheme to suppress operating
sound at the reception point is required.
First, determine the operating sound level of the outdoor unit at each
frequency. By applying this information to Table 1, the sound-proofing
calculation sheet, sound attenuation and additions are calculated for the
installation.
Difference
= 0
56+3.0
=59
Difference = 6
59+0.95
=59.95
Difference = 9.45
59.95+0.45
=60.4
Difference = 10.4
60.4+0.35=60.75
Difference = 14.75
60.75+0.1=60.85
Difference = 17.85
60.95
No further calculation necessary
60.85+0.1=60.95
Summary of Contents for ECO G SGP-EW120M2G2W
Page 3: ...A 1 System Configuration Contents 1 Type Configuration 1 Outdoor unit A 2 ...
Page 12: ...Outdoor Unit 3 External Dimensions B 8 ...
Page 13: ...Outdoor Unit 4 Wiring Diagram B 9 ...
Page 14: ...Outdoor Unit 5 Performance Characteristics B 10 Cooling Heating SGP EW120M2G2W ...
Page 15: ...Outdoor Unit 5 Performance Characteristics B 11 Cooling Heating SGP EW150M2G2W ...
Page 16: ...Outdoor Unit 5 Performance Characteristics B 12 Cooling Heating SGP EW190M2G2W ...
Page 17: ...Outdoor Unit 5 Performance Characteristics B 13 Cooling Heating SGP EW240M2G2W ...
Page 18: ...Outdoor Unit 6 Operating Sound Level Characteristics B 14 1 Standard Mode ...
Page 19: ...Outdoor Unit 6 Operating Sound Level Characteristics B 15 ...
Page 20: ...Outdoor Unit 6 Operating Sound Level Characteristics B 16 ...
Page 21: ...Outdoor Unit 6 Operating Sound Level Characteristics B 17 ...
Page 22: ...Outdoor Unit 6 Operating Sound Level Characteristics B 18 2 Quiet Mode ...
Page 23: ...Outdoor Unit 6 Operating Sound Level Characteristics B 19 ...
Page 24: ...Outdoor Unit 6 Operating Sound Level Characteristics B 20 ...
Page 25: ...Outdoor Unit 6 Operating Sound Level Characteristics B 21 ...
Page 28: ...Control Related 1 System Block Diagram C 2 ...
Page 29: ...Control Related 2 Remote Control Warning List C 3 ...
Page 30: ...Control Related 2 Remote Control Warning List C 4 ...
Page 31: ...Control Related 2 Remote Control Warning List C 5 ...
Page 76: ...Installation Work 1 Points regarding refrigerant pipe work E 3 APR P680BG ...
Page 77: ...Installation Work 1 Points regarding refrigerant pipe work E 4 APR P1350BG ...
Page 78: ...Installation Work 1 Points regarding refrigerant pipe work E 5 APR CHP680BG APR CHP1350BG ...
Page 86: ...Installation Work 2 Points regarding electrical work outdoor unit E 13 ...
Page 87: ...Installation Work 3 Outdoor unit installation work E 14 ...
Page 88: ...Installation Work 3 Outdoor unit installation work E 15 ...
Page 89: ...Installation Work 3 Outdoor unit installation work E 16 ...
Page 90: ...Installation Work 3 Outdoor unit installation work E 17 ...
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Page 106: ...Installation Work 3 Outdoor unit installation work E 33 ...