Viessmann VITOLIGNO 300-C Operating Instructions For The System User page 52

Appendix
Terminology
Setback mode (reduced heating mode)
See "Reduced heating mode".
Extension kit for heating circuit with mixer
Assembly (accessories) for controlling a heating circuit
with mixer
See "Mixer"
Heating circuit
A heating circuit is a sealed unvented circuit that con-
nects the boiler and radiators and in which the heating
water circulates.
A heating system may have several heating circuits,
e.g. one heating circuit for the rooms occupied by you
and one heating circuit for the rooms of a separate
apartment.
Heating circuit pump
Circulation pump for circulating the heating water in
the heating circuit
Actual temperature
Current temperature at the time of calling up, e.g.
actual DHW temperature
Mixer
A mixer mixes the water in the heating circuit as fol-
lows:
■ Water heated in the boiler
With the cooled water that flows back out of the heat-
■
ing circuit
The water brought to the right temperature is pumped
to the heating circuit by the heating circuit pump. The
control unit adjusts the heating circuit flow temperature
via the mixer to suit different conditions.
Night setback
See "Reduced heating mode".
Standard heating mode
For periods when you will be at home during the day,
use standard heating mode to heat your interior. Set
the periods using the time program for central heating.
During these periods, the interior is heated to the
standard room temperature.
52
Standard room temperature
For periods when you are at home during the day, set
the standard room temperature.
Open flue operation
The combustion air is drawn from the room where the
boiler is installed.
Reduced heating mode
For periods when you will be absent or during the
night, heat your rooms in reduced heating mode (set-
back mode). Set the periods using the time program
for central heating. During these periods, the interior is
heated to the reduced room temperature.
Reduced room temperature
For periods when you will be absent or during the
night, set the reduced room temperature. Set the peri-
ods using the time program for central heating. During
these periods, the interior is heated to the reduced
room temperature.
Safety valve
Safety equipment that your heating contractor must
install in the cold water pipe. The safety valve opens
automatically to prevent excess pressure in the DHW
cylinder.
Set temperature
Specific temperature that should be reached, e.g. set
DHW temperature for example.
Drinking water filter
A device that removes solids from potable water. The
drinking water filter is installed in the cold water pipe
upstream of the DHW cylinder or the instantaneous
water heater.
Weather-compensated mode
In weather-compensated mode, the heating flow tem-
perature is regulated according to the outside tempera-
ture. This means that no more heat is generated than
is actually required to heat the interior to the set room
temperature you have selected.
A sensor fitted on the outside of the building captures
the outside temperature and transmits it to the control
unit.