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A space-saving design of the necessary siphon height we can do on request. Contact your sales
representative for detailed information.
The following conditions are essential for correct operation:
At each drain a siphon must be connected.
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Several drains may not be connected to one siphon.
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The water from the siphon must run in a funnel.
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Before starting, fill the siphon with water.
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In case of outdoor units an antifreeze mechanism has to be provided on site.
The heights H1, H2 and H3 can be determined from the maximum negative pressure (p) and max-
imum pressure (p) in the section of the siphon or be determined by the information on the technical
data sheet as follows:
Total pressure
Dynamic pressure
Total static pressure pstat = pges – pdyn = 1113 Pa
1 mmWS = 9,81 Pa
H1 > 1113/9,81 = 114 mm + 15 mm (Safety) = about 130 mm
H2 = 65 mm
Siphon on suction side (in direction of airflow before the fan), see Figure 105.
H1 [mm] > p
[mm WS]
H2 [mm] > p/2 [mm WS]
Siphon on pressure side (in direction of airflow after the fan), see Figure 106.
H3 [mm] > p [mm WS]
H4 [mm] 0
pges
pdyn
Figure 105: Siphon on suction side
Figure 106: Siphon on pressure side
= 1196 Pa
= 83 Pa
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