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External sensor connection
The controller cooperates with the outdoor temperature sensor type CT6-P. Install the
sensor on the coldest wall of the building - usually the north wall in a covered place. The
sensor must not be exposed to direct sunlight or rain. Install the sensor at a height of at
least 2 m above the ground, away from windows, chimneys and other heat sources that
could interfere with temperature measurement (at least 1.5 m). Use a cable with a
conductor cross-section of at least 0.5 mm2 and a length of max. 25m. The polarity of the
wires is not important. Connect the other end of the cable to the controller terminals.
Screw the sensor to the wall using the mounting screws. You can access the screw holes by
unscrewing the sensor cover.
Connection of external sensor CT6-P.
Check of temperature sensors
Temperature sensors can be checked by measuring their resistance at a given
temperature. If you find larger differences between the measured resistance value and the
values in the following table, the sensor must be replaced.
CT4
Temp.
Min.
°C
Ω
802
0
874
10
20
950
25
990
30
1029
40
1108
1192
50
1278
60
1369
70
80
1462
90
1559
1659
100
43
Men. Ω
Max.
Ω
828
815
898
886
961
972
1000
1010
1040
1051
1122
1136
1225
1209
1319
1299
1416
1392
1490
1518
1591
1623
1733
1696
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