Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 92

Installation sequence
Power supply
■ The heat pump control unit/PCB
must be supplied without blocking by
the power supply utility; tariffs that are
subject to possible shutdown must not
be used here.
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 5-core cable.
■ 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, make the
power connection with the same
phase as the heat pump control unit;
we recommend 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 consumers
connected.
Heat pump control unit power supply (230 V~)
A
max.16 A
X3.18
X2.1
X1.1
A Mains terminals inside the heat
pump control unit
92
(cont.)
2
) and the cable
L1
1/N/PE
N
230 V / 50 Hz
?
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 C characteristics.
Note
This supply must never be blocked.
■ Max. fuse rating 16 A
■ Standard tariff (no optional low tariff
with power-OFF)
■ Recommended cable: 3 x 1.5 mm
2
(5 x 1.5 mm with power-OFF)
2