Operating instructions

15
%
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 "
tw
" to "0".
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)
E
Power supply (230 V, 50 Hz).
Danger
Incorrect core termination
can cause severe injuries
and damage to the equip-
ment.
Take care not to interchange
wires "L1" and "N".
The power supply must be equipped
with a neutral conductor. Water
pipes should be connected to the
earth bonding of the house in ques-
tion.
F
Vitotrol 100 (room temperature con-
troller) or on-site room temperature
controller
Separate installation instruc-
tions
or
Input for Y-plan or S-plan heating
systems using gas fired condensing
boilers
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.
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
Electrical connections
(cont.)
5366 836 GB
Installation