Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 62

Installation sequence
Power supply
■ 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.
■ In conjunction with own energy con-
sumption (use of power generated by
the PV system to meet own require-
ments):
Note
During power-OFF it is not possible to
operate the compressor with self-gen-
erated electricity.
Heat pump control unit power supply (230 V~)
X3
6
7
8
9
16
16
18
F1 T6,3AH
L1 N
62
(cont.)
X2 X1
N
N
3
1 1
■ Protect the power supply to the heat
pump control unit with a fuse of 16 A
(max.).
■ 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.
Note
This supply must never be blocked.
■ Max. fuse rating 16 A
■ Standard tariff (no optional economy
tariff with power-OFF)
■ Recommended power cable:
2
3 x 1.5 mm (5 x 1.5 mm
off by the power supply utility)
2
with power-