Viessmann VITOCAL 300 Installation And Service Instructions Manual page 13

Function description for the individual system . . .
DHW heating
DHW heating takes priority.
The heat demand is issued via the top
cylinder temperature sensor.
DHW heating is terminated when the
actual temperature at the cylinder
temperature sensor exceeds the
value selected at the control unit.
The DHW cylinder can also be
equipped with a second cylinder tem-
perature sensor.
Blocking (Power-OFF)
Implement the heat pump blocking by
the power supply utility (power-OFF)
via a zero volt contact. The heat pump
operation will be impaired if the power
supply is completely cut off.
Preparing for installation
(cont.)
The installation of an immersion hea-
ter is possible. This would be con-
trolled by the first cylinder
temperature sensor.
Protect the immersion heater via a
separate connection.
The contactor is controlled by the heat
pump control unit.
For this, the power-OFF conversion
kit (accessory for three-phase shut-
down) can be used that keeps the
system and the pump operational via
an additional control phase.
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