Minimum Limitation Of The Flow Temperature Setpoint - Siemens RVA47.320 User Manual

Room temperature
control
Note
Functioning:
Switching differential
Benefit
Description
78/166
Siemens Building Technologies
HVAC Products
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
With pump heating circuits, the amount of heat supplied is controlled by switching the
pumps on and off. This is accomplished with two-position control by means of the room
temperature's switching differential.
Room temperature acquisition requires a room unit.
°C
ON
P
OFF
P
ON
OFF
w
Pump ON TRx
Pump OFF TRx
4.30 Minimum limitation of the flow temperature
setpoint
•
Prevents too low flow temperatures
Minimum and maximum limitation define the range within which the flow temperature
setpoint may vary.
Basic Documentation RVA47.320
Description of the heating engineer settings
TRx
TRw+SDR
TRw
t
[ ]
°C
TRx
= TRw
= TRw + SDR
Legend
TRx Actual value of the room temperature
TRw Room temperature setpoint
SDR Switching differential of room
temperature
ON Switch-on point
OFF Switch-off point
t Time
P Pump
TRx Actual value of the room temperature
TRw Room
temperature setpoint
SDR Switching
differential of room temperature
P Pump (ON / OFF)
w Setpoint
Switch-on point
Switch-off point
CE1P2379E
15.07.2002