Viessmann Vitotronic 200 Series Operating Instructions For The System User page 47

Terminology
(cont.)
Factory settings: Slope = 1.4 and level = 0.
110
C
Fig. 38
Changing the slope:
A
The gradient of the heating curves changes.
Changing the level:
B
The heating curves are shifted in parallel in a verti-
cal direction.
Changing the standard room temperature (set
C
value):
The heating curves are offset along the "Set room
temperature" axis.
Note
Setting the slope or level of the heating curve too high
or too low will not result in damage to your heating sys-
tem.
Both settings affect the level of the flow temperature,
which may then be too low or unnecessarily high.
Tips on when and how to change the heating curve
slope and level are displayed by pressing ?.
Heating circuit
A heating circuit is a sealed circuit between the boiler
and radiators, in which the heating water circulates.
A heating system may comprise several heating cir-
cuits. For example, one heating circuit for the rooms
occupied by you and one heating circuit for the rooms
of a separate apartment.
Heating circuit pump
Circulation pump for the circulation of the heating
water in the heating circuit.
3.5
1.4
A
B
0.2
-20
Outside temperature
in °C
Mixer
A mixer mixes the water heated in the boiler with the
cooled water returning from the heating circuit. The
water, thus brought to the right temperature, is pumped
to the heating circuit by the heating circuit pump. The
control unit adjusts the heating circuit flow temperature
via the mixer to suit different conditions, e.g. changing
outside temperatures.
Room temperature
■ Standard room temperature:
For periods when you will be at home during the day,
set the standard room temperature.
Reduced room temperature:
■
For periods when you will be absent or during the
night, set the reduced room temperature. See also
"Heating mode".
Safety valve
A safety device that must be installed in the cold water
pipe by your heating contractor. The safety valve
opens automatically to prevent excess pressure in the
DHW cylinder.
Appendix
47