Heating Limit Eco - Siemens IQHeat User Manual

IQHeat
User manual
A curve that is set too low means that the heat will not be sufficient, that the secondary flows are too high.
A curve that is set too high results in unnecessary energy losses and can lead to excess temperatures in parts
of the buildings that are not adjusted for low flows.
7.5

Heating Limit ECO

The control has a built-in ECO function.
The ECO function ensures that heat is only started when needed. This means that savings are made for pump
energy, and ensures that no heat is present on the radiator side when it is not needed.
The temperature limit for when the heat is turned off is the result of the operating mode's set point minus the
Heating limit (ECO).
Example:
The controller is in Economy mode and Room temp.eco.is set to 20 °C. Heating limit (ECO) is set to -5.0°C.
When the outside temperature rises above 15°C (20-5) the heat is turned off.
The highest of the following values is used as input to compare with the heat limit:
•
current outside temperature
•
dampened outside temperature with standard building time constant (e.g. 20 hours)
•
dampened outside temperature with summer-winter time constant (e.g. 70 hours)
This means that in summer, the current outside temperature temporarily drops during the night, without the
heat going on.
As summer nights are short, this has no appreciable effect on comfort, but can save energy as heat does not
switch on unnecessarily.
1. Press Info to access the Main index.
2. Now select Heating Circuit > Heating curve,
press OK.
3. In the Curve points menu select the parameter to be
changed and press OK.
4. Set the desired value with the navigation dial, press
OK.
Parameter: Settings
range
Outs.temp.
design (P1)
25...130°C
Flow temp.
Design.(P1)
0...130°C
Flow temp, P2
0...130°C
Flow temp. P3
0...130°C
Flow temp. P4
0...65°C
Setp.fl.temp.
high(P5)
20
Relates to
Design outside
temperature
Flow temperature
at P1, outside
temp design
Flow temp at
outside temp. P2
Flow temp at
outside temp. P3
Flow temp at
outside temp. P4
Flow temp at
outside temp. P5