Installation Instructions

17
PUMP
X21
L N 1 L N?
GAS
D
X7
FAN
X20
A B
4 3 2 1
OT
C
FE
X1
%
%
Gas condensing boiler:
■ In the case of Viessmann DHW
cylinders: Cylinder temperature
sensor (plug on the cable harness
outside the control unit)
■ In the case of alternative DHW
cylinders compliant with the G3
Directive:
Cylinder demand junction box (for
connection of a cylinder tempera-
ture controller and a 2-way shut-
off valve)
■ Without DHW cylinder:
For operation without a DHW cyl-
inder, set rotary selector "
tw
" to
"0".
A
Only for weather-compensated
mode:
Outside temperature sensor (acces-
sory)
B
OpenTherm device
C
Connecting cable (accessory)
D
Jumper
E
Power supply (230 V, 50 Hz).
See page 21.
F
Vitotrol 100 or on-site room temper-
ature controller (230 V switched
input)
Remove jumper
D
when making
this connection.
Separate installation instruc-
tions
Information on connecting
accessories
For this connection, observe the
separate installation instructions
provided with the accessories.
Installation sequence
Electrical connections
5609 059 GB
Installation