Appendix Terminology - Viessmann VITOLIGNO 300-H Operating Instructions For The System User

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 connects the boiler and radi-
ators and in which the heating water cir-
culates.
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 sepa-
rate apartment.
Heating circuit pump
Circulation pump for circulating the heat-
ing water in the heating circuit
Actual temperature
Current temperature at the time of the
scan; e.g. actual DHW temperature.
Mixer
A mixer mixes the water in the heating
circuit as follows:
■ Water heated in the boiler
■ With the cooled water returning from
the heating circuit
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The water brought to the right tempera-
ture is pumped to the heating circuit by
the heating circuit pump. The control unit
adjusts the heating circuit flow tempera-
ture via the mixer to suit different condi-
tions.
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 peri-
ods using the time program for central
heating. During these periods, the inte-
rior is heated to the standard room tem-
perature.
Standard room temperature
For periods when you will be at home
during the day, select 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 (setback mode).
Set the periods using the time program
for central heating. During these periods,
the interior is heated to a reduced room
temperature.