8 Heating circuit
2-point heating curve
Fig. 2-29_08_008_01sn
1 Maximum heating circuit flow temperature
1)
2 Calculated required flow temperature
3 Reduction (the value by which the reduced tem-
perature is lower than the heating temperature)
4 Heating curve for heating mode (shown in red)
5 Heating curve for reduction mode (blue)
6 Minimum heating circuit flow temperature
1)
7 Flow temperature at outside temperature -15°C
8 Flow temperature at outdoor temperature
+15°C
!
1)
WARNING
- This temperature is system-
specific and must be agreed with the heating
engineer. If there is a risk of the boiler over-
heating, the hot water is discharged to the hea-
ting circuits at the
Maximum heating circuit
flow temperature
1
. Only to be set by qualified
personnel.
The desired heating circuit nominal flow temperature in
heating mode is set for an outside temperature of -
15°C
7
and +15°C
8
. Between these outside tem-
peratures, the nominal flow temperature is calculated
from the characteristics of the heating curve (inter-
polated).
Example for calculation of nominal flow tem-
perature
(see the following illustration):
Flow temperature at outside temperature of -15°C =
45°C
Flow temperature at outside temperature of +15°C =
22°C
Current external temperature = -5°C
In the heating circuit operating mode
Heating mode,
this applies:
> The computed flow nominal temperature (
Pos.9
) is
37.4°C
> The heating circuit is supplied with 37.4°C.
In the heating circuit operating mode
Reduced mode,
this applies:
Reduction = 10°C
> The computed flow nominal temperature (
Pos.10
) is
27.0°C
> The heating circuit is supplied with 27.0°C.
Fig. 2-30_08_008_03sn
Adaptation of the 2-point heating curve (in
hea-
ting mode
)
i
Note the currently set temperature before you
change the values.
A change in heating curve cannot be felt immediately.
Instead, this depends largely on the kind of heat dis-
tribution system (e.g. underfloor heating) and the buil-
ding standard (brick, lightweight construction etc.). It
is advisable to adapt the heating curve in small incre-
ments (+/- 2°C) with corresponding pauses (1 to 2
days). Depending on the current outside temperature,
different adjustments need to be made.
Current
outside tem-
perature
Perceived room
temperature
Recommended adap-
tation of heating curve
-15°C to -
5°C
too cold
Increase temperature
value at
7
too hot
Reduce temperature
value at
7
-5°C to
+5°C
too cold
Increase temperature
value at
7
and
8
too hot
Reduce temperature
value at
7
and
8
+5°C to
+15°C
too cold
Increase temperature
value at
8
too hot
Reduce temperature
value at
8
3-point heating curve
i
Function must be activated by qualified per-
sonnel.
Depending on the standard of building and insulation, it
is advisable to change over from the 2-point to a 3-
point heating curve. In contrast to the 2-point heating
curve, it is possible to stipulate a third temperature
11
,
24
Operation manual
therminator II touch
