Viessmann VITOCAL 350-A, Installation And Service Instructions Manual

Page: 105 / 256

105
General information regarding the power supply
Information regarding the compres-
sor power supply
■
!
Please note
An incorrect phase sequence
can cause damage to the unit.
Make the compressor power
supply
only in the phase
sequence specified (see termi-
nal) with a
clockwise rotating
field.
■ The compressor power fuses must
have Z characteristics.
■ If the compressor and/or instantane-
ous heating water heater (accessory)
are operated at a lower tariff (power-
OFF), provide an additional cable (for
example NYM 3 x 1.5 mm
2
) for the
power-OFF signal from the distribution
board (meter box) to the heat pump
control unit.
Information regarding the heat pump
control unit power supply
■ Protect the power supply to the heat
pump control unit with 16 A max.
■ For accessories and external compo-
nents that are not to be connected to
the heat pump control unit, we recom-
mend making the power connection
via the same fuse/MCB, but certainly
with the same phase as the heat pump
control unit.
Connection to the same fuse/MCB
provides additional safety when the
power is switched off. Observe the
power consumption of the consumers
connected (see page 245).
■ The power supply to the heat pump
control unit (3 x 1.5 mm 2 ) and the cable
for the power-OFF signal can be com-
bined in a five-core cable. Observe the
technical connection requirements of
the power supply utility.
Installation sequence
Power supply
(cont.)
5414 828 GB
Installation