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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
4.36 Switching differential of the room temperature
(SDR)
Temperature control with pump heating circuits.
Prevents overtemperatures in the rooms in the case of a pump heating circuit.
Serves as a room temperature limitation with pump heating circuits
Setting range Unit Factory setting
– . – / 0.5...4.0 °C – . –
The switching differential for two-position control will be changed.
Entry:
– . – Switching differential is inactive
• The pump always remains activated
Decrease: Switching differential will become smaller
• Pumps are switched on and off more often
• Room temperature varies within a narrower band
Increase: Switching differential will become greater
• Pumps are switched on and off less often
• Room temperature varies within a wider band
The room temperature sensor must be active
• This function only acts in automatic mode
• The display will show "ECO“
With pump heating circuits, the amount of heat supplied is controlled by switching the
pumps on and off. This is accomplished with 2-position control by means of the room
temperature's switching differential.
Functioning:
OFF
ON
P
°C
TRx
TRw+SDR
2371D02
TRw
t
Legend
TRx Actual value of the room
temperature
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