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Siemens Switzerland Ltd User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
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
intermediate seasons (spring and autumn), enabling the system to respond to short-
time temperature variations.
Example:
Setting line e.g.
Comfort setpoint (TRw) 22°C
24-hour heating limit (THG) -3°C
Changeover temperature (TRw-THG) heating off = 19°C
Switching differential (fixed) -1°C
Changeover temperature heating on = 18
°C
By changing the value entered, the respective heating periods will be shortened or
extended.
Increase: Heating mode will start
earlier,
changeover to ECO
later.
Decrease: Heating mode will start
later,
changeover to ECO
earlier.
• The function is not active in operating mode ”Continuously nominal temperature“
• The display will show ECO
• To give consideration to the building’s thermal dynamics, the outside temperature will
be attenuated
Flow temperature
setpoint limitations
Line no. Operating line
HC1 HC2 HC3P
740 1040 1340 Flow temp setpoint min
741 1041 1341 Flow temp setpoint max
Using this limitation, a temperature range for the flow temperature setpoint can be
defined. If the flow temperature setpoint demanded by the heating circuit reaches the
relevant limit and the heat request increases or decreases, the flow temperature
setpoint will be maintained at the maximum or minimum limit.
TVw Current flow temperature setpoint
TVmax Flow temperature setpoint maximum
Tvmin Flow temp setpoint minimum
24-hour heating limit
0 10 20 30 40 50 60 70 80 90 100
TV
max
min
akt
°C
2358Z09
TVw
TVmin
TVmax
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