Viessmann Vitocal 300-G Installation And Service Instructions Manual page 17

Function description in connection with the system . . .
Power-OFF
It is possible for the power supply uti-
lity to shut down the compressor and
instantaneous heating water heater
together.
Preparing for installation
This is done through switching off the
main contactor (see page 93).
This must not shut down the control
unit power supply.
(cont.)
17