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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.23.20 Building model
Line no. Operating line
6110 Time constant building
When the outside temperature varies, the room temperature changes at different rates,
depending on the building's thermal storage capacity. The above setting is used to
adjust the response of the flow temperature setpoint when the outside temperature
varies.
Example:
>20 hours
The room temperature responds more slowly to outside temperature variations.
10...20 hours
This setting is suited for most types of buildings.
<10 hours
The room temperature responds more quickly to outside temperature variations.
Current, composite and attenuated outside temperature
The outside temperature is used primarily for calculating the flow temperature setpoint.
The building’s thermal inertia is simulated by making use of an adjustable building time
constant.
The current outside temperature is acquired at sensor input B9 or via RF link. If the
outside temperature is not available, a substitute value of 0 °C is used.
The composite outside temperature is calculated by means of the filtered outside
temperature, the building time constant and the current outside temperature. The
proportion of the current outside temperature is 50% (constant).
Time constant building
Current outside
temperature
Composite outside
temperature
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