Heating Circuit Pump; Mixer; Night Setback; Open Flue Operation - Viessmann VITODENS 200-W Operating Instructions For The System User

Terminology
(cont.)
A system may comprise several heating circuits.
For example, one heating circuit for the rooms occu-
pied by you and one heating circuit for the rooms of a
separate apartment.
The heating circuits are designated at the factory as
"Heating circuit 1", "Heating circuit 2", etc.

Heating circuit pump

Circulation pump for circulating the heating water in
the heating circuit

Mixer

Hot heating water from the heat generator is mixed
with cooled heating water from the heating circuit. The
heating water, thus brought to the required tempera-
ture, is pumped to the heating circuit by the heating cir-
cuit pump. To ensure the required set room tempera-
ture is achieved, the control unit adjusts the flow tem-
perature via the mixer to suit different conditions.

Night setback

See "Reduced heating mode"

Open flue operation

The combustion air is drawn from the room where the
heat generator is installed.

Room sealed operation

The combustion air is drawn from outside the building.

Room temperature

Standard room temperature or comfort room temper-
■
ature:
Set the standard room temperature or comfort room
temperature for periods when you are at home dur-
ing the day.
Reduced room temperature:
■
For periods when you will be absent or during the
night, set the reduced room temperature; see "Heat-
ing mode".

Return temperature

The return temperature is the temperature at which the
heating water leaves a system component such as a
heating circuit.
If you or your qualified contractor have renamed the
heating circuits, e.g. as "Apartment", that name will be
displayed instead of "Heating circuit...".
Appendix
65