Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 93

Power supply
(cont.)
Compressor power supply (400 V~)
? ?
N
L3 L3
L2 L2
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, both com-
pressors (type BW/BWS) are "forced"
OFF.
Parameter "Stage at power-OFF" is
used to determine whether and at what
stage the instantaneous heating water
heater (on site) remains operational dur-
ing the power-OFF.
3 / PE
400 V, 50 Hz
Installation sequence
■ 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:
Type BW 121, BWS 121:
2
4 x 2.5 mm
Type BW 129, BWS 129:
2
4 x 4.0 mm
Type BW 145, BWS 145:
4 x 6.0 mm 2
Service instructions for Vitotronic
200 heat pump control unit
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
93