Vemer Chronos Key User Manual page 9

Keypad
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The keys have different functions according to the instrument status and they will be
described step by step in this user manual.
Multipurpose keys are not built into the instrument, that is to say contemporary
pressures of 2 or more keys.
There are two types of pressure:
- brief pressures,
- long pressures, with duration higher than 3 seconds.
During the press of a key, the display is blue.
Cleaning the display
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To clean the display use a soft, lint-free cloth, without using excess force.
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CHRONOS KEY Programmable Thermostat User Manual