Viessmann B1HF Installation And Service Instructions Manual page 13

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
(cont.)
C
D
E
F
G
H
Safety assembly
delivery and requires installing.
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.
Preparing for installation
Visible discharge pipe outlet point
Safety valve
Non-return valve
Shut-off valve
Cold water
Safety assembly
is included in the standard
H
13