Siemens QAA73.210 User Manual page 26

Note
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Siemens
Building Technologies
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.
°C
TRx
ON
P
OFF
Pump ON TRx = TRw
Pump OFF TRx = TRw + SDR
ON
The heating circuit pumps are controlled not directly by the QAA73.110, but by
boiler control. For this reason, this functionality is not ensured by the room unit
alone.
Room temperature setpoint for heating circuit 2. Active only if supported by BMU.
Flow temperature setpoint for heating circuit 2. Active only if supported by BMU.
Room Unit for Boiler Control
Description of room unit settings
Legend
TRx Actual value of the room
TRw+SDR
temperature
TRw
TRw Room temperature setpoint
SDR Switching differential of room
t
temperature
ON Switch-on point
OFF Switch-off point
t Time
P Pump
Legend
TRx Actual value of the room
temperature
TRw Room temperature setpoint
SDR Switching differential of room
temperature
P Pump (ON / OFF)
w Setpoint
°C
Switch-on point
Switch-off point
CE1U2283en
2015-09-16