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Subject to change without notice | 83054200hUK – Translation into English of the original German operating manual | ait-deutschland GmbH
The directivity factor Q for the different installation var-
iants:
Q = 2
Q = 4
Q = 8
In case of 2 or more units of the same heat pump type,
the respective level increase must be added to the cor-
responding sound pressure level from the following table
Number of n equally
loud sound sources
Level increase
∆ L
in dB
1
0,0
2
3,0
3
4,8
4
6,0
5
7,0
6
7,8
7
8,5
8
9,0
9
9,5
10
10,0
12
10,8
In case of different, not equally loud units, the level in-
crease is read off the following diagram:
Le
ve
l i
nc
re
as
e i
n d
B
Level difference in dB
Example: If the level difference between two unequal
sound sources is 5 dB, the level increase is an addition-
al 1.2 dB.
