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i) ‘Window open’ detection
The installed ‘FHT80TF-2’ door/window contact sensors require no operation. They detect
when a window or a door has been opened and notify the heating control by radio signal
accordingly. The heating control then reduces the target temperature to the ‘Window open’
temperature that has been set.
Likewise, when all the windows are closed, the heating control is notified of this again by radio
signal and restores the original temperature.
The temperature can also be changed manually to a different value at any time while
the window is open.
The ‘FHT80TF-2’ indicates that is has detected a change of state via its signal LED:
1 long blink
Window opened
3 short blinks
Window closed