Viessmann BWT 241.A Series, Installation And Service Instructions Manual

Page: 44 / 124

44
Danger
An absence of component earth-
ing in the system can lead to seri-
ous injury from electrical current
if an electrical fault occurs.
Connect the appliance and pipe-
work to the equipotential bonding
of the house in question.
Danger
Incorrect core allocation can
cause severe injury and damage
the appliance.
Never interchange cores "L" and
"N".
■ In negotiations with your power supply
utility, different supply tariffs for the
main power circuits may be offered.
Observe the technical connection
requirements of the power supply util-
ity
■ If the compressor and/or instantane-
ous heating water heater are operated
at an economy tariff (power-OFF),
either provide an additional cable (e.g.
3 x 1.5 mm
2
) for the power-OFF signal
from the distribution board (meter box)
to the heat pump control unit
or
Combine the cable for the power-OFF
signal and for the heat pump control
unit power supply (3 x 1.5 mm
2 ) in a 5-
core cable
■ The allocation of the power-OFF (for
compressor and/or instantaneous
heating water heater) is made via the
type of connection and by setting
parameters in the heat pump control
unit.
In Germany, the power supply can be
cut off for up to 3 x 2 hours per day
(24 h)
■ The heat pump control unit/PCB
must be supplied without power-OFF;
tariffs that are subject to possible shut-
down must not be used here
■ Protect the power supply to the heat
pump control unit with max. 16 A
■ For accessories and external compo-
nents that are not to be connected to
the heat pump control unit, connect the
power supply with the same phase as
the heat pump control unit; we recom-
mend using the same fuse/MCB.
Connection to the same fuse/MCB
provides additional safety when the
power is switched off. Observe the
power consumption of the connected
consumers
Installation sequence
Connecting power cables
(cont.)
5601 598 GB