Viessmann Vitodens 200-W B2HE Installation And Service Instructions Manual page 10

Preparing for installation
Preparing for installation
Connection on the DHW side for gas condensing combi boiler
Cold water installation
Fig. 3
Cold water connection of boiler
A
Drain outlet
B
Visible discharge pipe outlet point
C
Safety valve
D
Non-return valve
E
Shut-off valve
F
Cold water
G
Safety assembly
H
10
(cont.)
Safety assembly
required if it is possible that the mains water supply
pressure will exceed 10 bar (1.0 MPa), and no DHW
pressure reducing valve is installed (to DIN 4753).
Only use a non-return valve or a combined shut-off
and non-return valve in conjunction with a safety valve.
If the safety valve is used, the cold water shut-off valve
on the boiler must not be shut off.
Remove the toggle on the cold water shut-off valve (if
installed) to prevent manual shut-off.
Shock arrestor
If draw-off points likely to cause water hammer are
connected to the boiler's DHW network (e.g. flush
valves, washing machines, dishwashers): Shock
arrestors should be installed close to the cause of the
water hammer.
to DIN 1988 and EN 806 is
H