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Siemens Building Technologies
Basic Documentation QAA73.110 Room unit
CE1P2284en
HVAC Products
Handling
10.07.2002
2.5 Communication with boiler control
For communication between the QAA73.110 and boiler control, the OpenTherm
protocol is used.
OpenTherm differentiates between 2 modes, Plus and Lite:
−
In OpenTherm Plus mode, the QAA73.110 can read or write various standardized
objects via the bus
−
In OpenTherm Lite mode, the QAA73.110 delivers only one signal to the boiler
control for controlling the heat output. In the event of fault, boiler control signals
Boiler Lock-Out Fault
to the QAA73.110
•
The parameters displayed only in OpenTherm Plus mode are appropriately
identified in the parameter lists
•
The following descriptions of the individual parameters refer to the use of
OpenTherm Plus and are based on the assumption that the relevant functions are
supported by boiler control. Only then is the full functionality of the QAA73.110
ensured so that the most common applications can be fully covered
•
If a parameter is not supported by boiler control, the display shows 3 strokes – – –
in place of a value
2.6 Parameter settings for the enduser
The following settings can be made to meet the individual needs of the enduser.
Buttons
Explanation
Line
1
P RO G
Press one of the 2 line selection buttons.
This will take you directly to the programming level
"Enduser”.
1
2
P RO G
Press the line selection buttons to select the
required line.
The parameter list on the next pages contains all
available lines.
1
. . .
50
3
-
+
Press the + or – button to set the required value.
The setting will be stored as soon as you leave the
programming mode or change to another line.
The parameter list on the next 2 pages contains all
settings that can be made.
4
By pressing the Info button, you leave the
programming level "Enduser”.
Continuous
display
If no button is pressed for about 8 minutes, the room unit will automatically return to the
Info level.
OpenTherm bus
Notes
Description
Setting
Note
