Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 104

Installation sequence
Power supply
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.
■ If compressor and/or instantaneous
heating water heater (on site) are
operated at a lower tariff (power-OFF),
provide an additional cable (e.g.
NYM 3 x 1.5 mm
signal from the distribution board
(meter box) to the 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 which are not to be connected to
the control unit, we recommend mak-
ing the power connection to the same
fuse, but with at least the same phase
as the 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 241).
■ The power supply to the heat pump
control unit (3 x 1.5 mm
for the power-OFF signal can be com-
bined in a five-core cable. Observe the
technical connection requirements of
the power supply utility.
104
(cont.)
2
) for the power-OFF
2
) and the cable
Information regarding the power sup-
ply utility
■ In negotiations with your power supply
utility, different supply tariffs for the
main power circuits may be offered.
■ The control unit/electronics feed
must be implemented without possi-
ble blocking from the power supply util-
ity; tariffs that are subject to possible
shutdowns must not be applied to
these feeds.
■ The allocation of the power-OFF (for
compressor and/or instantaneous
heating water heater) is made via the
type of connection and by a setting in
the control unit (see pages 108 and
197). In Germany, the power supply
can be cut off for up to 3 x 2 hours
within any 24 h period.