Viessmann Vitodens 200 Technical Manual page 77

DHW connection on the Vitodens 100 and 200 gas fired combi boilers
For the DHW connection, connection sets
for installation on finished walls or for
installation on unfinished walls are
available as accessories. The integral
instantaneous water heater provides
direct DHW heating.
Cold water installation
B
A
WW
KW
HV GA HR
D
Anti-water shock device
R ½"
VITODENS
2.5 Connections on the gas and the water side
Note when using this feature in
conjunction with galvanised pipes that
the instantaneous water heater is
designed as a stainless steel plate heat
exchanger with copper solder joints.
In existing installations (modernisation
projects), the danger of electrolytic
corrosion is low, as a protective layer will
have been formed on the inside of pipes.
A Visible drain outlet
B Safety valve
C D E F
C Non-return valve
D Drain
E Shut-off valve
Safety assembly
F Cold water
GA Gas connection
HR Heating return
HV Heating flow
KW Cold water
WW DHW
If DHW should be drawn simultaneously
from several points, we would
recommend the installation of a separate
DHW cylinder in conjunction with the gas
fired boiler.
From a water hardness of 3.6 mmol/l and
higher, we recommend the use of a water
treatment system in the cold water supply
when considering DHW heating.
A safety valve to DIN 1988 is only
required, if the mains water supply
pressure exceeds 10 bar and no DHW
pressure reducer is used (as per
DIN 4753).
A safety valve must be installed if the
cold water supply is equipped with a
non-return valve. In addition the toggle
must be fitted to the cold water shut
off-valve.
Non-return valves may also be found in
pressure reducers and combined
free-flow valves with non-return valves.
We recommend the installation of an
anti-water shock device near pressure
shock generators, if the pipework, to
which the Vitodens is connected,
comprises taps where water hammers
may be created (e.g. pressure washers,
washing or dishwashing machines).
"Flexofit S" made by Flamco Flexcon
or
"reflex" made by Winkelmann +
Pannhoff GmbH
(available from your local dealer).
200
300
2
77