P32-EN – Subject to technical changes 04.11
70
Appendix
Transfer of the boiler flow temperature to modulating boilers
MAX
START
The required boiler flow temperature is output as an
analogue voltage signal (0 to 10 volts) with function 39
via analogue output A15 to a modulating boiler.
Analogue output 15 must be set with the corresponding
scaling in the “Outputs” menu according to boiler type
and manufacturer.
Standard settings for scaling
:
The factory-set controller scaling is the scaling for
a standard boiler
150 scale divisions (15°C) is assigned
0.6 V and 900 scale divisions (90°C) is assigned 10.0 V.
The relationship of the voltage signal to the boiler flow
temperature is shown in the adjacent diagram.
Setting the scaling
:
The appropriate values must be taken from the specific
data provided by the boiler manufacturer, as shown in the
adjacent sample table or the diagram above.
Voltage at output A15 [V]
Flow temperature [°C]
Scale divisions
Flow
temperature
[°C]
Input
voltage
[V]
Boiler
status
—-
0.0
Off
150
15
0.6
On/START
50
5.0
On
900
90
10.0
On/MAX
Flow temperature specifications for standard boilers
Standard boiler scaling
1 2 3 4 5 6 7 8 9 10 11 12 13 14
OUTPUT 15
BROWSE
BACK
OUTPUT STATUS:
SCALING:
150
: 0.60 V
900 : 10.00 V
Scaling output A15
In the function overview, press the “SERVICE” button. In
the main menu, select the “Outputs” entry by turning and
pressing the rotary wheel. In the Outputs menu, position
the pointer on “PAR?” beneath the entry “15: Analog
output” and press the rotary wheel. In the menu that then
appears, turn the rotary wheel until the pointer is at the
corresponding parameter values (figure on right). Press
and turn the rotary wheel to change parameters. Press the
rotary wheel again to save the value that you set. Press
the “BACK” button several times to return to the function
overview.
Scale divisions
Flow
temperature
[°C]
Input
voltage
[V]
Boiler
status
Off
On/START
On
On/MAX
Flow temperature specifications for other boiler
manufacturers
Use the adjacent table to enter the values determined by
the boiler manufacturer.
The scaling is then set according to these values.
You can only change the scaling in the “Expert” operating
mode. To do so, use
(see
page 26
).
