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Siemens Building Technologies
Basic Documentation QAA73.110 Room unit
CE1P2284en
HVAC Products
Description
of the heating engineer settings
10.07.2002
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.
OFF
ON
P
°C
TRx
TRw+SDR
23
71
D
02
TRw
t
Pump ON
TRx
=
TRw
Pump OFF
TRx =
TRw + SDR
°C
2284
Z2
0
ON
OFF
w
TRx
P
[
]
76
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.
4.18 Adaption of the heating curve
The adaption facility learns from the different heating situations and matches the control
to the heating circuit at regular intervals. Adaption of the heating curve takes place
automatically, which means that it need not be adjusted manually.
1. Press the line selection buttons to select line 77.
1. Press the + / – buttons to select the type of heating curve adaption.
Setting range
Unit
Factory setting
Inactive / active
–
Active
The setting will switch automatic adaption of the heating curve on or off.
Entry:
Inactive
No adaption:
The heating curve settings are maintained.
Active Automatic
adaption:
The heating curve will automatically be adapted as soon as the
operating level ”Nominal room temperature setpoint” is used.
Adaption acts according to line
75
”Room influence”.
Room temperature
control
Functioning
Switching differential
Note
Description
Line 77
Effect
Note
Legend
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
Legend
TRx
Actual value of the room
temperature
TRw
Room temperature setpoint
SDR
Switching differential of
room temperature
ON
Switch-on point