Power Supply - Viessmann Vitodens 050-W Installation And Service Instructions Manual

Electrical connections
Outside temperature sensor (accessory)
1. Fit outside temperature sensor.
Installation site:
■ North or north-westerly 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 vents
■ Not immediately below balconies
or gutters
■ Never render over
■ Connection:
2-core lead, length up to 35 m with
a cross-section of 1.5 mm

Power supply

Connect the power cable to the building
mains.
Regulations and Directives
Danger
Incorrectly executed electrical
installations can result in injuries
from electrical current and in
appliance damage.
Connect the power supply and
implement all safety measures
(e.g. RCD circuit) in accordance
with the following regulations:
■ IEC 60364-4-41
■ VDE regulations
■ Connection conditions speci-
fied by your local power supply
utility
(cont.)
2. Connect the outside temperature
sensor across terminals 3 and 4
(underneath the appliance).
2
Install an isolator in the power cable
which simultaneously isolates all non-
earthed conductors from the mains with
contact separation of at least 3 mm.
Protect the power cable with an external
3 A fuse to BS 1362.
Danger
Incorrect core allocation can
result in serious injury and dam-
age to the appliance.
Take care not to interchange
wires "L1" and "N".
Danger
If system components are not
earthed, serious injury from elec-
tric current can result if an elec-
trical fault occurs.
Connect the appliance and pipe-
work to the equipotential bonding
of the building in question.
Installation sequence
19