Viessmann Vitotrol 100 OT Installation And Service Instructions Manual page 13

Electrical connections
On-site switching contact: Floating con-
tact, electrically isolated
Connection to mixer extension kit
A
B
4 3 2 1
D
1 2 3 4 5 6
C
A Boiler control unit
B Terminals on the control unit
C Outside temperature sensor
D Mixer extension kit
(cont.)
1 2 3 4
X22
X12 X3
Installation sequence
The following functions can be connec-
ted:
■ Window contact (operation with frost
protection temperature when contact
is open)
■ Telephone contact (telephone remote
switch)
■ Presence detector (switching contact)
H
?
G
E F
8
7
6
5
4
E Room temperature controller for
heating circuit without mixer
F Room temperature controller for
heating circuit with mixer
G Input for on-site switching contact
96
L
G
8
7
6
5
4
13