Viessmann VITODENS 100-W Installation And Service Instructions Manual page 13

Fitting the boiler and making connections
Making the connections on the water side
For fittings on the heating water
side and DHW side, see separate
installation instructions.
A B C
¨
A Heating flow
B Gas condensing boiler:
Cylinder flow
Gas condensing combi boiler:
DHW
C Gas connection
D Gas condensing boiler:
Cylinder return
Gas condensing combi boiler:
Cold water
E Heating return
D E
Installation sequence
(cont.)
Gas condensing boiler
A
Note
In accordance to the Fittings Directive
G24.2a this is a temporary connection
and has to be removed immediately after
filling.
E
C
13