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INSTAllATION
4.4
Condensate drain
4.4.1 Condensate drain engineering guidelines
The condensate should be led from the condensate drip
tray of the gas condensing boiler to a siphon and from
there via a hose or fixed pipework for condensate drain
-
age to the sewer system or independent waste water
treatment facility. The following points must be observed
during installation:
Requirements and directives
Local regulations pertaining to the condensate discharge
must be observed.
-
Before planning
condensate drainage, check with the
responsible authority about the local regulations to be
observed.
- Regulations in Germany:
- Worksheet DWA-A 251 Condensate from condensing
boilers from the DWA code of practice
- Worksheet DVGW VP 114 Neutralisation units for gas
burners - Requirements and testing from the DVGW
Gas code of practice.
- Requirements and directives in Austria:
-
ÖNORM H 5152 Calorific plants - Planning guidelines
- and above all the directives for customer natural gas
systems (G K series) of the ÖVGW Gas code of practice.
- Switzerland/Liechtenstein:
- See Suissetec information sheet regarding condensate
Material
The boiler condensate drain must be made of corro-
sion-resistant material. The following materials are suit-
able for condensate discharge:
Stoneware, glass, stainless steel and the following plas-
tics: PVC, PE, PP, ABS and UP.
Siphon
The siphon (supplied with the heat generator) must be in-
stalled at the condensate drain of the heat generator and
the condensate drain must be installed at the condensate
outflow of the siphon.
Neutralisation
Without neutralisation, condensate discharge is only per-
mitted if the waste water pipes and the sewer system are
made from plastic or ceramic material (the local authority
may approve a derogation).
If required by the local authority, the condensate must be
neutralised before being discharged into the sewer sys-
tem. In this case, a neutralisation unit must be installed in
the condensate drain.
NOTICE
Condensate with corrosive effect
Depending on the sewer system (materials
used and waste water in the sewer system),
the acid condensate from the heat generator
can damage the sewer system in such a way
that waste water seeps out.
• Before the condensate drain is installed,
check with the responsible public authority
whether the condensate must be neutral-
ised before being discharged into the sew-
er system.
Condensate outflow
Route the condensate drain so that the condensate can
flow out:
- The minimum inner diameter of the condensate drain
must be 15 mm.
-
Use a hose or fixed pipework for condensate drainage.
- The hose connections of the condensate drain must be
laid with a constant downward gradient from the siphon
to the neutralisation unit (if present) and to the sewer
system. If a constant downward gradient in the conden-
sate drain is not possible, a condensate pump must be
installed in the condensate drain before the gradient
change.
- No water trap is allowed in the condensate drain. For
this reason, the individual hose connections must be
as short as possible to prevent them from sagging. If
necessary (e.g. if the neutralisation unit is positioned
next to the heat generator), pull an empty tube over the
hose connection as reinforcement.
Hose connection with constant
downward gradient
Water trap in hose connection
Summary of Contents for 51-UltraGas 2 1000
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