Opening The Control Unit Enclosure; Electrical Connections - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Opening the control unit enclosure

3.
4x
Fig. 11
!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing any work, touch earthed
objects such as heating or water pipes to dis-
charge static loads.

Electrical connections

Information on connecting accessories
When connecting accessories observe the sep-
arate installation instructions provided with
them.
X21 X7
X20
C
4 3 2 1
OT
A B
Fig. 12
Only for weather-compensated mode:
A
Outside temperature sensor (accessories)
OpenTherm device
B
Remove jumper when making this connection.
D
Connecting cable
C
D Jumper
2.
1.
2x
D
X1
96
L N 1 L N
?
E F
Power supply (230 V, 50 Hz)
E
See page 16.
Vitotrol 100 or on-site room temperature controller
F
(230 V switched input)
Remove jumper
Installation sequence
when making this connection.
D
Separate installation instructions
15