Sound Pressure Level For Outdoor Unit; Considerations - Hitachi YUTAKI S80 Series Technical Catalogue

5. Acoustic characteristic curves

5.1 Sound pressure level for outdoor unit

5.1.1 Considerations

1 Distance of the unit from the measuring point: At 1 meter from the unit's front surface; 1,5 meter from floor level.
2 The data is measured in an anechoic chamber, so reflected sound should be taken into consideration when installing
the unit.
3 The sound measured with the curve A shown in dB(A) represents the attenuation in function of frequency as perceived
by the human ear.
4 Reference acoustic pressure 0dB=20μPa
80
TCGB0075 rev.0 - 11/2012