40
Sound levels
Sound pressure level:
Sound pressure level is defi ned as the sound level, which
at an ear level of 1.8 metres, is perceived one metre from
the heat pump. Measured in a sound measurement room
without echo at an outdoor temperature of +7ºC and 50ºC
fl ow temperature.
Example:
When the heat pump is installed outside with free sound
propagation the sound level drops by 6dBa with each
doubling of distance.
Technical information
Sensor table
The table shows all sensor resistance at different
temperatures.
Temperature (ºC) kΩ
-40 154.300
-35 111.700
-30 81.700
-25 60.400
-20 45.100
-15 33.950
-10 25.800
-5 19.770
0 15.280
5 11.900
10 9.330
15 7.370
20 5.870
25 4.700
30 3.790
35 3.070
40 2.510
45 2.055
50 1.696
55 1.405
60 1.170
65 0.980
70 0.824
75 0.696
80 0.590
85 0.503
90 0.430
Example Optima 600
Distance Lp - ear (dBa)
1 metres 53
2 metres 47
4 metres 41
8 metres 35
Heat pump
Sound pressure level
Lp - ear (dBa)
Optima 600 53
Optima 900 53
Optima 1100 53
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