Viessmann VITODENS 222-F Installation And Service Instructions Manual page 17

Electrical connections
Danger
Incorrect core termination
can cause severe injuries
and damage to the equip-
ment.
Take care not to inter-
change cores "L1" and
"N".
■ Install an isolator in the power
supply line that simultaneously
isolates all non-earthed conduc-
tors from the mains with at least
3 mm contact separation.
Remove the existing cable grom-
met when using larger cross-sec-
tions (up to 714 mm). Secure the
cable with cable grommet F (see
page 18) integrated into the cas-
ing base.
■ Max. fuse rating 16 A.
gD External safety solenoid valve
(LPG) D
Do not remove jumper between "1"
and "L" when making this connec-
tion.
lH Power supply of accessories
Where the boiler is installed in a wet
area, the connection of accessories
to the power supply must not be car-
ried out at the control unit. The
power supply connection for acces-
sories can be made immediately at
the control unit, if the boiler is instal-
led outside wet areas. This connec-
tion is controlled directly with the
system ON/OFF switch (max. 3 A)
■ Vitotrol 100 UTA
■ Vitotrol 100 UTD
■ Vitotrol 100 UTD-RF
(cont.)
Low voltage plug X3
! Outside temperature sensor (only
for weather-compensated control)
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 ven-
tilation outlets
■ Not immediately below balconies
or gutters
■ Never render over
■ Cable length max. 35 m with a
cross-section of 1.5 mm
? Flow temperature sensor for low
loss header (accessories)
% Cylinder temperature sensor (fitted
and connected)
aVG KM BUS subscriber (accessory)
■ Vitotrol 200 or 300 remote con-
trol (only for weather-compensa-
ted control)
■ Vitocom 100
■ Extension kit for one heating cir-
cuit with mixer (only for weather-
compensated control)
■ External extension H1 or H2
■ Open Therm extension
Installation sequence
2
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