Operation Manual

6 720 645 350 (2010/09)
Technical terms | 37
Technical terms
Automatic mode
The heating system is heated up in accordance
with the heating program and changes
automatically between the 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 the
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 taking a
longer shower, for example.
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 pump.
Factory settings
Values permanently saved in the controller (e.g.
complete heating programs) that are available at
any time and that can be reinstated according to
demand.
Flow temperature
Temperature with which the heated water
circulates in the central heating system, i.e. from
the heating appliance to the heating surfaces
(radiators, underfloor heating system etc.) in the
various rooms. To reduce heat losses and save
energy, today's designs provide for significantly
lower flow/return temperatures, e.g. 60/40 °C,
whereas in the past 90/70 °C was common.
Frost protection
Frost protection is the lowest setting permitted
by the controller. Frost protection prevents the
heating system from freezing up.
Groups of days
Groups of days are available for the convenient
setting of heating or 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.