Condensate Connection - Viessmann Vitodens 300-W Technical Manual

Design information
Vitodens 200-W and 300-W
B
C
DHW cylinder below the boiler
A DHW
B Cold water
C DHW circulation
Vitodens 222-W
The connection of a DHW circulation pipe is not recommended.
DHW circulation for gas condensing combi boilers
Due to the low water content of plate heat exchangers, the connec-
tion of DHW circulation pipes is not recommended for gas con-
densing combi boilers.

6.5 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.
6
VIESMANN
84
(cont.)
A
C
DHW cylinder adjacent to the boiler
A DHW
B Cold water
C DHW circulation
Even the low heat losses of thermally insulated DHW circulation
lines (to EnEV) lead to a higher cycling frequency for the gas con-
densing combi boiler (reheating).
Note
A pipe vent valve must be installed between the trap and the neu-
tralising system.
A
B
VITODENS