Viessmann Vitodens 100-W Installation And Service Instructions Manual page 15

Electrical connections
% Gas fired condensing boilers only:
Cylinder temperature sensor (plug
on the cable harness outside the
control unit) or connect the control
box (supplied with the system boiler)
if a 230V 2-port valve and cylinder
stat are used in a 4-pipe installation
(see separate installation instruc-
tions)
Note
Gas fired condensing boiler without
DHW cylinder:
For operation without a DHW cylin-
der, set rotary selector "
A Only for weather-compensated
mode:
Outside temperature sensor (acces-
sory)
B Open Therm device
C Connection line (accessory)
D Jumper (remove when connecting a
room thermostat)
Outside temperature sensor (accessory)
1. Plug the power cable supplied with
the outside temperature sensor into
slot "X21".
2. Connect the outside temperature
sensor to terminals 3 and 4.
(cont.)
E Power supply (230 V, 50 Hz).
The power supply must be equipped
with a neutral conductor. Water
pipes should be connected to the
earth bonding of the house in ques-
tw " to "0". tion.
F Vitotrol 100 (room temperature con-
troller) or on-site room temperature
controller
or
Input for Y-plan or S-plan heating
systems using gas fired condensing
boilers
NOTE: If an outside temperature sensor
is used it is recommended not to install
the system boiler to a 'Y' or 'S' plan heat-
ing system.
Installation sequence
Danger
Incorrect core termination
can cause severe injuries
and damage to the equip-
ment.
Take care not to interchange
wires "L1" and "N".
Separate installation instruc-
tions
15