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34 | Technical terms
Technical terms
Automatic mode
The central heating is heating in accordance with
the heating program and an automatic
changeover takes place between operating
modes Comfort / Economy / Frost.
Combi boiler
A heating appliance that can heat DHW and
heating water simultaneously.
Constant operation
In constant operation, automatic operation or
heating program is interrupted and the heating
system heats in accordance with the relevant
"required" room temperature.
DHW circulation pump
A DHW circulation pump circulates DHW between
the DHW cylinder and the draw-off point (e.g. hot
tap). This makes hot water available more
quickly.
DHW cylinder
A DHW cylinder stores large volumes of heated
potable water (e.g. 120 litres), and thereby
makes sufficient hot water available at the draw-
off points (e.g. hot taps). This is ideal, for
example if taking a longer shower.
DHW program
The DHW program specifies at what switching
times DHW should be heated and when a DHW
circulation pump should run. If the DHW program
is associated with the heating program, the
heating program also determines the switching
times for DHW heating and the operation of the
DHW circulation program.
Factory settings
Values permanently saved in the controller that
are available at any time and that can be
reinstated according to demand.
Frost protection
Frost protection is the lowest room temperature
permitted by the controller. Frost protection
prevents the freezing up of the heating system in
the room where the controller is installed.
Groups of days
Groups of days are available for the convenient
setting of the heating of DHW programs (e.g.
Monday to Friday, Saturday and Sunday etc.). In
conjunction with the selected group of days,
settings can be applied to several days
simultaneously.
Heating program
The heating program provides an automatic
changeover between operating modes at fixed
switching times. If the DHW program is
associated with the heating program, the heating
program also determines the switching times for
DHW heating and the operation of the DHW
circulation program.
Holiday program
The holiday program enables an interruption of
the otherwise applicable controller settings over
several days. After the holiday program has
expired, the controller operates with the
previously applicable settings.
Lead room
The room in your home where the controller is
installed is the lead room. The room temperature
in that room acts as control variable for the entire
heating system.
34


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