Terminology; Operating Program; Operating Status; Extension Kit For Heating Circuit With Mixing Valve - Viessmann vitocrossal 300 Operating Instructions Manual

Additional Information

Terminology

Operating program

The operating program determines whether you heat
your rooms and DHW, or only heat DHW, or whether
you switch off central heating (with frost protection
monitoring).

Operating status

In the operating program "Heating and DHW", the
operating status changes from "Standard heating mode"
to "Reduced heating mode" and vice versa.
The times for the operating status changeover are defined
by you when setting the time program.

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 delivered 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 outside temperature.

Under floor heating system

Under floor heating systems are slow, low temperature
heating systems and only respond very slowly to short
term temperature changes.
Therefore, heating to the reduced room temperature at
night and enabling "Economy mode" during short
absences do not result in significant energy savings.
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Vitocrossal 300 CU3A 26 to 57 Operating
Heating mode

Standard heating mode

For periods when you will be at home during the day,
use the standard room temperature to heat your
rooms. Set the periods (time phases) using the time
program for central heating.

Reduced heating mode

For periods when you will be absent or during the
night, heat your rooms to the reduced room temperature.
Set the periods using the time program for central
heating. With underfloor heating systems, reduced
heating mode only yields limited energy savings (see
"Underfloor heating").

Room temperature-dependent heating mode

With room temperature-dependent operation a room
will be heated until the selected set room temperature
has been reached. A separate temperature sensor
must be installed in the room for this purpose.
The heating output is regulated independent of the
outside temperature.

Weather-compensated heating mode

In weather-compensated operation, the supply
temperature is controlled according to the outside
temperature.
This means that only that amount of heat is generated
that is necessary to heat the rooms to the room
temperature you selected.
The outside temperature is captured and transmitted to
the control unit by a sensor fitted outside the building.