Viessmann VITODENS 300-W Technical Manual page 71

Design information
(cont.)
Cold water installation for the Vitodens 200-W gas combi boiler
WW
KW
HV GA HR
A Visible drain pipe outlet
B Safety valve
C Non-return valve
D Drain
E Shut-off valve
F Cold water
GA Gas connection
HR Heating return
HV Heating flow
KW Cold water
WW DHW
A safety valve to DIN 1988 only has to be installed when the mains
water supply pressure exceeds 10 bar (1 MPa), a: 6 bar (0.6 MPa),
and no DHW pressure reducing valve is used (in accordance with
DIN 4753).
VITODENS
Safety equipment
Install a safety valve if the cold water supply is equipped with a non-
return valve. In addition remove the toggle from the cold water shut
off-valve.
Non-return valves are commonly found in pressure reducers and com-
bined shut-off and non-return valves.
Shock arrestor
Ø 86
R½"
If the pipework to which the Vitodens is connected comprises taps
where water hammers may be created (e.g. pressure washers, wash-
ing machines or dishwashers), we recommend the installation of a
shock arrestor near such water hammer generators.
Flexofit S made by Flamco-Flexcon
or
Reflex made by Winkelmann + Pannhoff GmbH
(available from your local dealer).
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VIESMANN
71