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Vitoligno 300-C Operating Maintenance
Terminology
Setback mode (reduced heating mode)
See “Reduced heating mode”.
Heating program
With the heating program you determine whether you
heat your rooms and DHW, or only heat DHW or whether
you shut down your heating system with frost protection
monitoring.
You can select the following heating programs:
H“Heating and DHW”
The rooms are heated and DHW is provided (winter
mode).
H“Only DHW”
DHW is provided but there is no central heating
(summer mode).
H“Standby mode”
Frost protection for the boiler and the DHW tank is
enabled, no central heating, no DHW heating.
Note: No heating program is available for central heating
without DHW heating. When you want central
heating, hot water is generally also required (winter
mode). If you do want just central heating, select
the heating program “Heating and DHW” and set
the DHW temperature to 50°F (10°C) (see page
28). This means that you will not heat DHW
unnecessarily but the DHW tank is protected
against frost.
Operating status
In the heating program “Heating and DHW”, the operating
status changes from “Standard heating mode” (see page
18) to the operating status “Reduced heating mode”
(see page 18) and vice versa. The times for the operating
status change are defined when the time program is set.
Extension kit for heating circuit with mixing valve
Assembly (accessory) for controlling a heating circuit
with mixing valves. See “Mixing valves”.
Mixing Valve
A mixing valve mixes the water heated in the boiler
with the cooled water returning from the heating circuit.
The water, heated to the right temperature in line with
demand, is factory set to the heating circuit by the
heating circuit pump. The control unit adjusts the heating
circuit supply temperature via the mixing valve to the
various conditions, e.g. different outdoor temperature.
Heating circuit pump
Circulation pump for the circulation of the heating water
in the heating circuit.
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