Viessmann VITOCROSSAL CI, Operating Instructions Manual

Page: 41 / 48

41
0.2
Outside temperature in °C
Boiler
water
or
flow temperature
in °C
Slope
2.4 2.6
2.8
3.0
3.2
3.4
90
80
70
60
50
40
30
0 -10 -20 10
A
B
2.0 2.2
Set room temperature
in °C
35
30
25
20
15
10
5
0.4
0.6
0.8
1.0
1.2
1.4
-30
1.8 1.6
C
-14
Fig. 33
Example:
For outside temperature
−
14 °C :
A
Underfloor heating system, slope 0.2 to 0.8
B
Low temperature heating system, slope 0.8 to 1.6
C
Heating system with a boiler water temperature in
excess of 75 °C, slope 1.6 to 2.0
Factory settings: Slope = 1.4 and level = 0.
A
B
Boiler
water
or
flow temperature
in °C
110
+20 -20
Outside temperature in °C
3.5
1.4
0.2
Fig. 34
A
Changing the slope:
The steepness of the heating curve changes.
B
Changing the level:
The heating curves are shifted in parallel in a verti-
cal direction.
Heating circuit
A heating circuit is a sealed unvented circuit that con-
nects 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 circulating the heating water in
the heating circuit
Mixer
Hot heating water from the boiler is mixed with cooled
heating water from the heating circuit. The heating
water, thus brought to the required temperature, is
pumped to the heating circuit by the heating circuit
pump. The control unit adjusts the flow temperature via
the mixer to suit different conditions, e.g. changing out-
side temperatures.
Night setback
See "Reduced heating mode"
Open flue operation
The combustion air is drawn from the room where the
boiler is installed.
Room sealed operation
The combustion air is drawn from outside the building.
Room temperature
■ Standard room temperature:
Set the standard room temperature for periods when
you are at home during the day.
■ Reduced room temperature:
For periods when you will be absent or during the
night, set the reduced room temperature; see "Heat-
ing mode".
Appendix
Terminology
(cont.)
5814953