Viessmann VITODENS 222-F Series Technical Manual page 128

Design information
Cold water installation of Vitodens 200-W gas condensing combi boiler
8
GH L K M
A Visible drain pipe outlet point
B Safety valve
C Non-return valve
D Drain outlet
E Shut-off valve
F Cold water
G Heating flow
H DHW
K Gas connection
L Cold water
M Heating return
A safety valve to DIN 1988 only has to be installed if 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).
VIESMANN
128
(cont.)
B
C D E F
A
Safety assembly
D
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
combined shut-off and non-return valves.
Shock arrestor
Ø 86
R½"
If the pipework to which the Vitodens is connected also supplies
draw-off points at which water hammers may occur (e.g. pressure
washers, washing machines or dishwashers): Install shock arrestors
near the source of the water hammer (recommended).
Flexofit S made by Flamco-Flexcon
or
Reflex made by Winkelmann + Pannhoff GmbH (available from your
local dealer).
VITODENS