Viessmann Vitocal 300-G Installation And Service Instructions Manual page 96

Installation sequence
Power supply
(cont.)
Heat pump control unit power supply (230 V~)
A
max.16 A
X3.18 L1
X2.1 N
X1.1
?
A Mains terminals inside the heat
pump control unit
Compressor power supply (400 V~)
? ?
N
L3 L3
3 / PE
L2 L2
400 V, 50 Hz
L1
L1
A
■ Fuse protection in accordance with the
compressor output (see specification).
■ Low tariff and power-OFF can be
used.
Power supply with power-OFF
Power-OFF without on-site load disconnection
The power-OFF signal is connected
directly to the heat pump control unit.
When power-OFF is enabled, the com-
pressor is "forced" off, and in the two-
stage version (type BW 301.A + BWS
301.A), both compressors.
Parameter "Stage at power-OFF" is
used to determine whether and at what
stage the instantaneous heating water
heater (if installed) remains operational
during the power-OFF.
96
Note
This supply must never be blocked.
1/N/PE
230 V / 50 Hz
■ Max. fuse rating 16 A
■ Standard tariff (no optional low tariff
with power-OFF)
■ Recommended cable: 3 x 1.5 mm
(5 x 1.5 mm
■ No parameters need to be set when
using economy tariff with power-OFF
facility. During the power-OFF period,
the compressor is shut down.
■ Recommended power cable:
5 x 2.5 mm
Max. lead length:
50 m
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
2 with power-OFF)
2
Service instructions for Vitotronic
200 heat pump control unit
2