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Good thermo contact should be maintained
between sensors and measured surface. To
this purpose thermoleading paste should be
used. It is not acceptable to lubricate sensors
with water or oil. Wires of sensors should be
separated from network electrical wires. In
such a case wrong readings of temperature
may be shown. Minimum length between
those wires should be 10 cm. It is not
acceptable to allow for contact betweens
wires of the sensors and hot parts of the
boiler and heating installation. Wires of the
sensors are resistant to temperature not
exceeding 100 degrees C.
11.8 Weather sensors connection
The controller cooperates solely with weather
sensor type CT4-P. The sensor should be
installed on the coolest wall of the building.
Usually it is the northern wall, under the
roof. The sensor should not be exposed to
direct sunrays and rain. The sensor should
be installed at least 2 m above the ground
far away from windows, chimneys and other
sources of heat.
To connect use wire with diameter at least
0,5mm2 up to 25m long. Polarization of
wires is not essential. Second end should be
connected to terminals of controller
according to Pic. 19 or properly to used kind
of controller.
The sensor should be screw to the wall.
Acces to assembly holes is possible after
unscrewing the cover of the sensor.
Fig. 1 Weather sensor connection CT4-P.
11.9 Testing of temperature sensors
CT4 temperature sensor may be tested by
measuring its resistance at the given
temperature. In case of significant
differences between measured resistance
and the values indicated in the table below -
replace the sensor.
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