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Room influence R
Based on the difference between the measured and set room temperature, the water flow temperature can be
adjusted. By means of the potentiometer R (located under the
cap of the FS171 ) the influence of the room temperature measurement can be set.
Example
The room temperature is set to
± 20°C (mid position of the upper potentiometer). As a result of external factors
the room temperature rises to 23°C. When the R is set to 6, the difference (23-20=) 3°C is multiplied by 6 and
therefore the calculated value of the heating curve is temperature lowered by 18 degrees (3 x 6 = 18 K). This
function also provides a quick starting up of the installation after a period of night operation.
Common installation examples for homes and offices `
To prevent complaints in spring and in fall, the switch-difference is defined on top of the heating curve. For this
reason, the heating curve has often to be set somewhat lower than shown in the graphs.
Shown below are some common values:
Be careful when using thermostatic valves
When the remote controller FS171 is located in a room with thermostatic valves, the R value has to be set to
zero. This is to prevent interference between the thermostatic valves and the VAG controller.
Be careful with automatic pump-switch
For correct operation of the flow temperature transmitter, the minimum running time of the pump shall be 15
minutes more than the tiring time if the boiler.
4


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