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Siemens Building Technologies Basic Dokumentation RVA63.280, RVA53.280 CE1P2374E
Landis & Staefa Division 19.04.2001
2.25 Switching differential of 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
TRw Room temperature setpoint
SDR Switching differential of
room temperature
PPump
ON Switch-on point
OFF Switch-off point
tTime
Pump ON TRw
Pump OFF TRw =TRw + SDR
°C
2373Z14
ON
OFF
w
TRx Actual value of room
temperature
TRw Room temperature setpoint
SDR Switching differential of
room temperature
wSetpoint
102 Switching differential of
room temperature
Switch-on point
Switch-off point
Benefits
Description
Setting
Effect
Note
Room temperature
control
Switching differential
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