Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 20

Installation sequence
Electrical connections
Low voltage plugs
! Outside temperature sensor
(only for weather-compensated
control units).
Terminals X3.1 - X3.2.
Installation:
North or north-western wall,
2 to 2.5 m above ground level;
in multi-storey buildings, in the
upper half of the second floor
Not above windows, doors or
ventilation outlets
Not immediately below balco-
nies or gutters
Never render over
2-core lead, max. 35 m length
with a cross-section of
2
1.5 mm
? Flow temperature sensor for low
loss header (accessories)
Terminals X3.4 - X3.5.
20
(cont.)
& Solar temperature sensor
Terminals X3.8 - X3.9.
NOTE: If no solar panels are
fitted to the appliance the solar
sensor has to be connected
otherwise the appliance is going
into an error code. Also switch
relay 1 off (see page 64 Manual
mode 0).
aVG KM BUS subscriber (acces-
sories)
Terminals X3.6 - X3.7.
Vitotrol 200 or 300 remote con-
trol
Vitocom 100
Extension kit for a heating cir-
cuit with mixer
Vitosolic
External extension H1 or H2
Refit the cover to the wiring chamber
(see page 18).