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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
6.5.15 Boost heating
Line no. Operating line
HC1 HC2 HC3
770 1070 1370 Boost heating
Boost heating is used to reach the new setpoint more quickly when switching from the
Reduced setpoint to the Comfort setpoint, thus shortening the heating up time. During
boost heating, the room temperature setpoint is raised by the value set here. A higher
setting leads to shorter heating up times, a lower setting to longer heating up times.
Boost heating with room thermostat:
Boost heating becomes active if parameterized and when the room temperature
setpoint changes from Reduced to Comfort. It remains active until the room thermostat
reports warm.
For boost heating, the flow temperature setpoint is calculated as follows:
Flow temp setpoint (8744/8774/8803) = Flow temp setpoint room stat (742/1042/1342)
* [1+ boost heating (770/1070/1370)/20].
Example:
Flow temp setpoint room stat (742) 48 °C
Boost heating (770) 3 °C
Flow temp setpoint (8744) = 48 °C * [1 + 3/20] = 55.2 °C
Boost heating with heating curve:
Boost heating becomes active if parameterized and when the room temperature
setpoint changes from Reduced to Comfort. It remains active until the room
temperature reaches the level of comfort setpoint -0.25 K. During boost heating, the
room temperature setpoint is increased by the parameterized amount of boost heating.
Note!
Boost heating is possible with or without room sensor.
Figure 24: Boost heating
Key
Line no. Meaning
DTRSA Room temperature setpoint increase
TRw Room temperature setpoint
TRx Actual value of room temperature
Boost heating
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