6 720 820 872 (2016/12)
CR 400 | CW 400 | CW 800
38 | Service menu
Simple heating curve
The simple heating curve (weather-compensated control with
base point) is a simplification of the curved heating curve as a
straight line. This straight line is described by two points: the
base point (starting point of the heating curve) and the end
point.
Setback types
The setback type determines how the heating system works in
the setback phases in the automatic mode.
In the service menu
Central heating settings
>
Heating
circuit 1
...
8
>
Setback type
the following setback types are
available to suit the differing needs of the user:
•
Reduced mode
: The temperature of the rooms continues
to be adjusted in setback mode. This setback type is:
–
very comfortable
–
recommended for underfloor heating systems.
•
Outside temperature threshold
: if the adjusted outside
temperature falls below the value of a set outside
temperature threshold, the heating system will operate as
in reduced mode. Above this threshold the heating system
is off. This setback type is:
–
suitable for buildings with several living spaces where
no user interface is installed
–
less comfortable than the reduced mode
–
more economical than the reduced mode
–
only available if the outside temperature is recorded
–
without outside temperature sensor same as reduced
mode.
•
Room temperature threshold
: if the room temperature
falls below the desired temperature for the setback mode,
the heating system works in the same way as in the reduced
mode. If the room temperature exceeds the desired
temperature, the heating system is off. This setback type
is:
–
suitable for open-plan buildings with few adjoining
rooms without a separate user interface
–
less comfortable than the reduced mode
–
more economical than the reduced mode
–
only available if the room temperature is recorded.
If the heating system should be off in the setback phases (frost
protection remains active), set the following main menu
option:
Heating
>
Temperature settings
>
Setback
>
Off
(standby mode).
Heat constantly below a certain outside temperature
The heating system can cool down under a certain value due to
the setback mode. In such cases DIN-EN 12831 requires that
heat emitters and heat sources are designed for a certain
output. This serves to maintain a comfort heat.
In
Heat constantly below
you can set the outside temperature
at which the setback mode is interrupted (with reference to the
adjusted outside temperature).
Fig. 23 and 24 show how the frost protection function works,
with and without this parameter activated. Selected settings:
Setback type
:
Outside temperature threshold
and
Reduced
mode below
: 5 °C.
Fig. 23
Effect with setting
Off
(default setting)
Fig. 24
Effect with setting – 15 °C
Key to fig. 23 and 24:
T
A
Outside temperature
T
VL
Flow temperature
[1]
Standby mode (
Æ
Setback types)
[2]
Reduced mode (desired room temperature for setback
mode)
[3]
Heating mode (desired room temperature for heating
mode)
Underfloor
heating system
Radiators,
convectors
Minimum outside
temperature T
A,min
– 10 °C
– 10 °C
Base point
25 °C
25 °C
End point
45 °C
75 °C
Maximum flow temperature
T
VL,max
48 °C
75 °C
Room temperature offset
0.0 K
0.0 K
Table 17 Basic settings of the simple heating curve
T
A
T
VL
5°C
2
1
6 720 645 480-33.2O
T
A
T
VL
5°C
-15°C
2
3
1
6 720 645 480-34.3O
Summary of Contents for CR 400
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