Electrical Connections - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Opening the control unit casing
!
Please note
Electronic assemblies can be
damaged by electrostatic dis-
charge.

Electrical connections

Information on connecting
accessories
When connecting accessories
observe the separate installation
instructions provided with them.
X21 X7
X20
C
4 3 2 1
OT
A B
A Only for weather-compensated
mode:
Outside temperature sensor (acces-
sory)
B OpenTherm device
Remove jumper D when making
this connection.
C Connecting cable (accessory)
D Jumper
GAS
%
Installation sequence
(cont.)
Before beginning work, touch
earthed objects, such as heating
or water pipes, to discharge static
loads.
D
PUMP FAN
L N 1 L N
?
E F
E Power supply (230 V, 50 Hz).
See page 17.
F Vitotrol 100
Remove jumper D when making
this connection.
Separate installation instruc-
tions
X1
15