INSTALLATION
Mounting
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10.14 installation
The temperature sensors have a decisive influence on the function
of your heating system. Therefore ensure the correct seating and
adequate insulation of sensors.
Outside temperature sensor AFS 2 (included in the pack
supplied)
26�03�21�0052
Install the outside temperature sensor on a north or north-eastern
wall. Minimum distances: 2.5 m from the ground, 1 m to the side
of doors and windows. The outside temperature sensor should
be freely exposed to the elements, but should not be installed
above windows, doors or air ducts and should not be subject to
direct sunlight.
Connect the outside temperature sensor to terminal X2 (T(A)) and
the earth terminal block X26 of the appliance.
Installation:
Remove the cover.
Secure the lower part with the screw supplied.
Connect the cable.
Replace the cover. The cover must audibly click into place.
Contact sensor AVF 6
This sensor is required when using a mixer circuit.
Installation information:
26�03�01�1431
Clean the pipe.
Apply heat conducting paste.
Secure the sensor with a cable tie.
PTC sensor resistance values
The sensors installed in the appliance (return, flow and source
sensors), the outside temperature sensor AFS 2, the contact sen-
sor AVF 6 and the PTC immersion sensor TF 6A all have identical
resistance values.
Temperature in °C Resistance in Ω
-20 1367
–10 1495
0 1630
10 1772
20 1922
25 2000
30 2080
40 2245
50 2417
60 2597
70 2785
80 2980
90 3182
100 3392
10.15 High limit safety cut-out for underfloor heating
systems STB-FB
!
Material losses
In case of failure, in order to prevent an excessively high
flow temperature in the underfloor heating system, we
generally recommend the use of a safety temperature
controller to limit the system temperature.
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