Viessmann VITODENS Series Operating Instructions Manual page 33

Terminology
Constant temperature operation
In constant temperature operation, the
heating water is constantly heated to the
selected heating flow temperature.
Operating program
With the operating program you deter-
mine whether you provide central heat-
ing and DHW, or only DHW heating, or
whether you shut down your heating sys-
tem with frost protection monitoring.
You can select the following operating
programs:
■ " "
Central heating and DHW heating is
provided (winter mode).
■ " "
DHW is provided but there is no cen-
tral heating (summer mode).
■ " "
Frost protection for the boiler and
DHW cylinder is active, no central
heating, no DHW heating (standby
mode).
Note
No operating program for central heating
without DHW heating is available. If
rooms are to be heated, hot water is gen-
erally also required (winter mode).
If you do want just central heating, select
operating program "
DHW temperature to 10 °C (see
page 18). This means that you will not
heat DHW unnecessarily but the DHW
cylinder is protected against frost.
" and set the
Heating circuit
A heating circuit is a sealed unvented
circuit between the boiler and radiators,
in which the heating water circulates.
Heating circuit pump
Circulation pump for the circulation of the
heating water in the heating circuit.
Actual temperature
Current temperature at the time of the
scan; e.g. actual DHW temperature.
Boiler water temperature
See "Constant temperature operation".
Open flue operation
The combustion air is drawn from the
room where the boiler is installed.
Balanced flue operation
The combustion air is drawn from out-
side the building.
Safety valve
A safety device that must be installed by
your heating contractor in the cold water
pipe. The safety valve opens automati-
cally to prevent excess pressure in the
DHW cylinder.
Set temperature
Default temperature that should be
reached; e.g. set DHW temperature.
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