Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 19

Electrical connections
3. Bundling cables with cable ties and
securing them to the side panel
External connections at the control unit
Plug 230 V
sF Solar circuit pump (connected in
the delivered condition)
fÖ Power supply
Danger
Incorrect core termina-
tions can cause severe
injuries and damage to
the equipment.
Take care not to inter-
change wires "L1" and
"N".
Install an isolator in the power
supply line that simultaneously
isolates all non-earthed con-
ductors from the mains with at
least 3 mm contact separation.
Max. fuse rating 16 A.
(cont.)
lH Power supply accessories (230
V/50 Hz). Where the boiler is
installed in a wet area, the con-
nection of accessories to the
power supply must not be carried
out at the control unit. The power
supply for accessories can be
made immediately at the control
unit, if the compact boiler is
installed outside wet areas. This
connection is directly controlled
with the system ON/OFF switch
(max. 3 A).
aBH See lH.
Installation sequence
19