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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
6.5.11 Room model
The room model calculates a fictive room temperature for rooms without room sensor.
This allows boost heating, quick setback and optimum start/stop control to be
implemented with no need for using a room sensor. The calculation takes into account
the attenuated outside temperature and the heat up gradient for switching to a higher
setpoint, plus the building’s time constant for switching to a lower setpoint.
TRw
8704
712 / 1012 / 1312
714 / 1014 / 1314
710 / 1010 / 1310
TRwAkt
8742 / 8772 / 8802
7471d17/0910
Figure 22: Room model
Key
Line no. Meaning
HC1 HC2 HC3
710 1010 1310 TRK Room temperature Comfort setpoint
712 1012 1312 TRR Room temperature Reduced setpoint
714 1014 1314 TRF Frost protection setpoint
8704 TAgem Composite outside temperature
8742 8772 8802 TRmod Room temperature model
TRwAkt Current room temperature setpoint
Note!
The room model is always calculated. If the outside temperature is not available, the
room model performs the calculation with a substitute value of 0 °C. Then, the
Heating functions themselves decide on the source of the room temperature, based
on the compensation variant and the state of the room sensor:
The model temperature is always used for the calculation if no room sensor is
available
The model temperature is used for the calculation if weather compensation alone is
required
The current temperature is used for the calculation if there is a room sensor and
room influence or room control is required
Note!
For applications with room thermostat, the temperature of the room model (TRmod)
is set to the room temperature Comfort setpoint as soon as the room thermostat signals
Warm.
The heat up gradient is available for every heating circuit and can be set.
Line no. Meaning
HC1 HC2 HC3
794 1094 1394 Heat up gradient
6110
Time constant building
8703
Outside temp attenuated
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