DEVI devireg 540 User Instruction page 12

The button is alternately turned and
pressed to choose periods with econ-
omy set-back and periods with com-
fort temperature respectively.
The programming switches between
low (economy set-back) and high
(comfort) temperature every time you
press the button.
And between every time you press,
you can turn the button and choose
the period of time.
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