Viessmann VITODENS 100-W Operating Instructions Manual page 22

Appendix
Terminology
Constant temperature operation
In constant temperature operation, the
heating water is constantly (continu-
ously) heated to the selected boiler water
temperature.
Operating modes
You can select the following operating
modes:
■ When "rw" is selected:
The rooms are heated. DHW is heated
(winter mode).
■ When w is selected:
DHW is provided but there is no cen-
tral heating (summer mode).
■ When r is selected:
The rooms are heated but there is no
DHW heating.
■ When "rw" is set to "0":
Frost protection for the boiler and
DHW cylinder is active, no central
heating, no DHW heating (standby
mode).
Heating water temperature
The temperature of the heating water
that flows to the radiators (roughly equal
to boiler water temperature).
Boiler water temperature
The heating water in the boiler (boiler
water) is heated to the temperature
selected at the control unit. This temper-
ature is described as boiler water tem-
perature.
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Comfort function
If the comfort function is switched on, the
instantaneous water heater is kept up to
temperature (standby). Hot water is
therefore quickly available.
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.
Room temperature-dependent opera-
tion
A room temperature control unit cap-
tures the room temperature and com-
pares this with the required room tem-
perature you selected. If the room tem-
perature is lower than the required value,
the boiler is switched on; if the room tem-
perature is higher than the required
value, the boiler is switched off.
Please make any adjustments to the
connected room temperature control unit
using the relevant operating instruc-
tions.
Note
The heating water temperature must be
set sufficiently high using rotary selector
" tr " for the desired room temperature
to be reached.