Condensate Connection - Viessmann VITODENS 242-F Technical Manual

Design information
The flow rate of the DHW circulation pump must not exceed
1.5 l/min.
Power supply for DHW circulation pump
DHW circulation pumps with their own internal control unit must be
connected to a separate power supply. Mains connection via the
Vitotronic control unit or Vitotronic accessories is not permissible.

5.4 Condensate connection

Route the condensate drain pipe with a constant fall.
Route the condensate from the flue system together with the boiler
condensate directly or (if installed) via a neutralising system (acces-
sories) to the public sewage system.
For routing the condensate connection, see the relevant chapter on
"pre-installation in unfinished buildings".
Condensate drain pipe and neutralisation
During heating operation, condensate with pH values between 4 and
5 is formed in the condensing boiler and in the flue.
The condensate should be drained in accordance with appropriate
regulations.
Code of Practice DWA-A 251 on "Condensate from condensing boil-
ers", which is generally based on the local waste water regulations
[in Germany], determines conditions for draining condensate from
condensing boilers into the public sewer system.
The composition of condensate drained from Vitodens condensing
boilers meets the requirements specified in Code of Practice
DWA-A 251.
The condensate drain pipe to the sewer connection must be freely
accessible for inspection.
It must be installed with a continuous fall and must contain a stench
trap. Also provide a suitable facility for sampling.
Condensate drain pipes must only be made from corrosion-resistant
materials (e.g. reinforced hoses).
Never use any zinc-plated materials or those containing copper
for pipes, connection pieces, etc.
A trap is installed in the condensate drain to prevent flue gases
escaping.
Local water regulations and/or specific technical circumstances may
prescribe designs which vary from those described in the above
Codes of Practice.
VITODENS
(cont.)
Installation scheme for DHW circulation, see page 64.
Note
A pipe vent valve must be installed between the trap and the neu-
tralising system.
Contact your local authority responsible for waste water manage-
ment in good time prior to installation, to find out about local regula-
tions.
Condensate from gas combustion equipment up to 200 kW
combustion output
Up to a rated heating output of 200 kW, the condensate from a gas
condensing boiler can generally be introduced into the public sew-
age system without prior neutralisation.
Also ensure that your domestic drainage systems are made from
materials that are resistant to acidic condensate.
According to the Code of Practice DWA-A 251, these materials
include:
■ Clay pipes
■ Hard PVC pipes
■ PVC pipes
■ PE HD pipes
■ PP pipes
■ ABS/ASA pipes
■ Stainless steel pipes
■ Borosilicate pipes
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VIESMANN
65