S-CB Px 120 Manual
17
6.2.
Condensate drain connection
The condensate drain has a 19mm flexible discharge hose. The siphon must always be filled with water. As a
safety measure, the siphon has been provided with a floating ball, which closes the outlet in case of water ab-
sence, preventing large flue gas leakage.
Use only condensate resistant materials for the external condensate drainage system. Blockage of this drain
might damage the boiler. The drain connection is correct when the condensate can be seen flowing away, e.g.
using a funnel. Any damage that might occur, when the drain is not installed correctly, is not covered by the war-
ranty.
There should be an open connection of the condensate hose into the sewage system, see also the picture on
page 14. Pressure fluctuations in the sewer system may not affect the pressure in the condensate drain hose,
supplied with the siphon:
←
Open connection to sewer
The siphon must be checked at least once a year. Disassemble the siphon and clean every part of it.
Check the functioning of the siphon by filling it with water. Then blow into the top condensate inlet and
gently increase the pressure. At some point water starts coming out of the siphon outlet. During this the
floating ball should gradually drop into its seat. By doing this, the ball then should close the outlet (al-
most) completely.
When mounting the siphon, before commissioning the boiler and/or after maintenance, the siphon must
ALWAYS
be completely filled with water.
This is a safety measure: the water in the siphon keeps the flue gases from leaking out of the
heat exchanger via the condensate drain.
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