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

Electrical connections
X21 X7
X20
B
4 3 2 1
A
A Only for weather-compensated
mode:
Outside temperature sensor (acces-
sory).
B Connecting cable (accessory).
C Terminal box cylinder demand
(accessory; see separate installa-
tion instructions).
D Circulation pump connecting cable
(supplied).
Note
If the circulation pump is not con-
nected to the control unit, connect
an external frost stat.
E Jumper (1 - L).
(cont.)
GAS
5
C
Installation sequence
PUMP FAN
L N 1 L N
?
F G
M
D
1~
F Power supply (230 V, 50 Hz).
Danger
Incorrect core allocation can
result in serious injury and
damage to the appliance.
Never interchange cores
"L1" and "N".
The power supply must be from a
fused spur with a 2 pole isolator
switch, fitted with a 3 A fuse.
Wire the power supply with a neutral
conductor. Connect water pipes to
the earth bonding of the building in
question.
G Connections for external 230 V con-
trols:
■ Vitotrol 100 (room temperature
controller)
E
X1
15