Viessmann Vitopend 100-W Installation And Service Instructions For Contractors page 8

Preparing for installation
Preparing for installation
Cold water installation
A Cold water connection, boiler
B Drain outlet
C Visible discharge pipe outlet point
D Safety valve
E Non-return valve
F Shut-off valve
Shock arrestor
If draw-off points that could cause pres-
sure peaks (water hammer/shock) are
connected to the same pipework as the
boiler (such as pressure washers, wash-
ing machines or dishwashers), we would
recommend the installation of a shock
arrestor near the source of such pres-
sure shocks.
g: Fit a small domestic expansion ves-
sel if water hammer occurs.
8
(cont.)
G Cold water
H Safety assembly
A safety assembly H to DIN 1988 and
EN 806 is required if the mains water
supply pressure exceeds 10 bar (1.0
MPa), and no DHW pressure reducing
valve is installed (to DIN 4753).
Only use a non-return valve or a com-
bined 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 it
being shut off manually.