Viessmann VITODENS 100-W Installation And Service Instructions Manual page 17

Electrical connections
Outside temperature sensor (accessory)
1. Plug the power cable supplied with
the outside temperature sensor into
slot "X21".
Power supply
Regulations and Directives
Danger
Incorrectly executed electrical
installations can lead to injury
from electrical current and result
in equipment damage.
Make the power supply connec-
tion and implement all protective
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
Install an isolator in the power supply line
that simultaneously isolates all non-
earthed conductors from the mains with
at least 3 mm contact separation.
(cont.)
2. Connect the outside temperature
sensor to terminals 3 and 4.
We additionally recommend installing an
AC/DC-sensitive RCD (RCD class B
occur with energy efficient equipment.
Protect the power cable with max. 16 A.
Danger
Incorrect wire termination can
cause severe injury and damage
the appliance.
Take care not to interchange
wires "L1" and "N".
Danger
The absence of component
earthing in the system can lead to
serious injury from electrical cur-
rent if an electrical fault occurs.
Connect the appliance and pipe-
work to the equipotential bonding
of the building in question.
Installation sequence
) for DC (fault) currents that can
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