Siemens LMS14 User Manual page 140

24-hour heating limit
Key
140/617
Building Technologies Division
Line no.
HC1 HC2 HC3
732 1032 1332
The 24-hour heating limit is used to switch the heating on and off in the course of the
day, depending on the outside temperature. This function is used primarily during
spring and autumn to respond to short-term temperature variations.
The 24-hour heating limit function switches the heating system off when the current
outside temperature or the composite outside temperature rises to a level of one
adjusted differential below the current operating level.
The heating switches back on when the current outside temperature and the composite
outside temperature drop below the set difference minus 1 K again.
Note!
In Comfort mode, the function is always deactivated.
The required ECO temperature differential can be parameterized. The function can be
activated/deactivated.
T
8700
732
1032
TRw
1332
1
H
0
Figure 20: Eco function – 24-hour heating limit
Line no.
HC1 HC2 HC3
8700
8704
732 1032 1332
Example:
Operating line
Room temperature setpoint
24-hour heating limit (THG)
Changeover temperature (room temperature setpoint – setpoint of 24-
hour heating limit), heating Off
Switching differential (fixed)
Changeover temperature, heating On
User Manual LMS14...
6 The settings in detail
Operating line
24-hour heating limit
8704
Meaning
TA Outside temperature
TAgem Composite outside temperature
THG 24-hour heating limit
H Heating (1 = On, 0 = Off)
t Time
T Temperature
TRw Room temperature setpoint
1 K
7471d16/1014 t
E.g.
22 °C
-3 °C
= 19 °C
-1 K
= 18 °C
CC1U7471en
07.05.2014