Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 108

Installation sequence
Power supply
Two stage (type BW/BWS)
■ Fuse protection in accordance with the
compressor rating (see specification).
■ Low tariff and power-OFF can be
used.
■ No parameters need to be set when
using low tariff with power-OFF. Dur-
ing the power-OFF period, the com-
pressor is shut down.
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.
108
(cont.)
3/PE
400 V,
50 Hz
2.
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 (see page 197).
1.
L2
L3 L1
?