Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 99

Power supply
(cont.)
D Ripple control receiver (contact
open: power-OFF enabled)
E Backup fuse ripple control recei-
ver
Power-OFF with on-site load disconnecting switch
The power-OFF signal is connected to
the on-site contactor of the low-tariff
power supply and in the control unit.
The compressor and instantaneous
heating water heater (accessory) are
switched off during power-OFF (con-
tact G open).
Diagram excluding fuses and RCD.
A Control unit
Installation sequence
F High tariff meter
G TNC system feed
H Low tariff meter
Note
Observe the technical connection
conditions of the relevant power sup-
ply utility.
B Instantaneous heating water hea-
ter (accessory)
C Compressor
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