Vemer CHRONOS Series User Manual page 46

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Keyboard
The keys carry out different functions on the basis of the instrument status and they
Multipurpose keys are not built into the instrument, that is to say contemporary
pressures of 2 or more keys.
- brief pressures,
During the press of a button, the display is blue.
■ Cleaning the display
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CHRONOS Programmable Thermostat User Manual