Viessmann VITODENS 100-W Installation And Service Instructions Manual page 21

Electrical connections
Connection of room temperature controller with time switch and DHW cylinder
with 2-way valve and 230 V cylinder temperature controller
%
A Cylinder demand terminal box
B Jumper, remove when making this
connection
C Power supply (230 V, 50 Hz).
See page 23
D Cylinder temperature controller
230 V
(cont.)
A H
G
Installation sequence
C
E 2-way shut-off valve
F High limit safety cut-out
G Time switch
H Room temperature controller
D
M
1~
E
F
21