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55
AST 14 C 257/00
Mathematical formula – use the following formula:
CURVE
Testmin
20
20
Tmax
−
−
=
where Tmax is the maximum flow temperature and Testmin is the minimum outside
temperature.
Example:
Low temperature: High temperature:
Tmax = 44°C Tmax = 70°C
Test = -10°C Test = -10°C
CURVE
(-10)
20
20
44
−
−
=
CURVE
(-10)
20
20
70
−
−
=
P10 curve = 0.8 P10 curve = 1.7
Checking the thermoregulation curve setting
It takes time to choose the right curve and certain precautions may be necessary.
•
If a reduction in the outside temperature corresponds to an increased ambient
temperature, set a curve with less slope (i.e. lower);
•
If a reduction in the outside temperature corresponds to a reduced ambient
temperature, set a curve with more slope (i.e. higher);
•
If the ambient temperature remains constant when the outside temperature
changes, this means the curve is correct.
If the ambient temperature is constant, but different from the required value, you will have
to shift the curve.
This occurs automatically when you press the +/- heating buttons on the boiler keypad.
With an external probe installed, these buttons no longer regulate the flow temperature,
they regulate the fictitious temperature required in the room, which ranges from 15°C to
35°C.
You are advised to set a value of between 20°C and 25°C, or at least similar to the value
set by the ambient thermostat.
