Viessmann BWT 221.A06, Installation And Service Instructions Manual

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42
Plug Sensor Type
aVG KM BUS
Connection of the components on site (interchangeable
wires). Use the KM BUS distributor (accessory) if several
of the following devices are connected.
■ Extension kit for one heating circuit with mixer M2
■ Vitotrol 200A remote control (assign the heating cir-
cuits at the remote control)
■ External extension H1
■ Vitocom 100 communication interface
X24 Connection of the LON communication module (plug in
on site, see LON communication module installation
instructions)
X31 Coding card slot
Connecting power cables
Isolators for non-earthed conductors
■ The mains isolator (if installed) must
simultaneously isolate all non-earthed
conductors from the power supply with
a minimum contact separation of 3 mm
■ We additionally recommend installing
an AC/DC-sensitive RCD (RCD class
B
) for DC (fault) currents that
can occur with energy efficient equip-
ment
■ If no mains isolator is installed, all non-
earthed conductors must be isolated
from the power supply by the upstream
circuit breakers with at least 3 mm con-
tact separation
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
■ Technical connection require-
ments specified by your local
power supply utility
■ Protect the power supply to the
heat pump control unit with
max. 16 A
Installation sequence
Electrical connections
(cont.)
5601 574 GB