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

Installation sequence
Electrical connections
Outside temperature sensor (accessories)
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 2nd 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 requirements
specified by your local power
supply utility
22
(cont.)
2. Connect the outside temperature
sensor across terminals 3 and 4
(underside of appliance).
2
Install an isolator in the power cable to
provide omnipolar separation from the
mains for all active conductors, corre-
sponding to overvoltage category III
(3 mm) for full isolation. This isolator
must be fitted in the permanent electrical
installation, in line with the installation
requirements.
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".