Viessmann VITODENS 100-W Installation And Service Instructions Manual page 10

Installation sequence
Fitting the boiler and making connections
Making connections on the water side
A B A B
A Heating water flow
B Heating water return
Y-plan system
A
A Cylinder
B Vitodens 100-W
10
C
B
(cont.)
Note
Install a shut-off valve and drain & fill
valve on site in the heating water
return.
D
E
F
C Circulation pump
D Feed and expansion tank
F