Condensate Connection; Condensate Drain And Neutralisation - Viessmann VITODENS 242-F Technical Manual

Design information

6.4 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 "Pre-
installation in unfinished buildings".

Condensate drain 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 con-
densing 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 extracting samples.
Condensate drains must only be made from corrosion-resistant mate-
rials (e.g. reinforced hoses).
Never use any zinc-plated materials or those containing copper
for pipes, connection pieces, etc.
A siphon is installed in the condensate drain to prevent flue gasses
escaping.
Local water regulations and/or specific technical circumstances may
prescribe designs, which vary from those described in the above
Codes of Practice.
Neutralising system
6
A Condensate drain
B Neutralising system
C Ventilation via the roof
The Vitodens can be supplied with a separate neutralising system
(accessories). Any condensate is piped to and processed in the neu-
tralising system.
The condensate drain pipe to the sewer connection must be accessible
for inspection. Install it with a fall and a stench trap on the sewer side,
and provide a suitable facility for extracting samples.
VIESMANN
68
(cont.)
C
A
B
Note
A pipe vent valve must be installed between the siphon and the neu-
tralising system.
Contact your local authority responsible for waste water management
in good time prior to installation, to find out about local regulations.
Condensate from gas combustion equipment up to 200 kW com-
bustion output
Up to a rated heating output of 200 kW, the condensate from a gas
condensing boiler can generally be introduced into the public sewage
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
Install a condensate lifting system (available as an accessory) if the
Vitodens has been installed below the waste water anti-flooding
level.
Since the consumption of neutralising granulate depends on the oper-
ating mode of the system, carry out regular checks during the first year
of operation to determine the required top-up volume. One fill can last
longer than one year.
VITODENS