LG R5TT20F-SA0 Manual page 18

Heat Pump Water Heater
12. Sound Levels (Reference Data)
R5TT20F-SA0
Heating
80
70
60
50
40
30
20
10
17
- 60 Hz (R134a)
Approximate
Hearing
Threshold
63 125
Octave Band Center Frequency (Hz)
250 500 1000
▲ Turbo/HeatPump
● Auto
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
2000 4000 8000