DEVI devireg 540 User Instruction page 5

All this means that as soon as you have set your devireg
™
550 at your desired comfort temperature, you do not have
to do anything else. devireg 550 will automatically adjust
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the heating to meet your requirements for comfort and
economy, no matter how the weather is changing outside.
This also means that devireg 550 is capable of
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detecting a sudden temperature drop in the room.
Instead of switching the heating on to immediately
compensate, the devireg 550 uses the information stored
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then checks to see if this is caused by e.g. the effects of a
window opened for 10 minutes !
Even the programming of economy temperatures (i.e.
during the night) is very simple. You do not have to
calculate how much earlier the heating should start in order
to reach a specifi c temperature at a specifi c time. Just tell
the devireg 550 when you want the comfort temperature
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and the devireg 550 will take care of the rest. By learning
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the rate of heat loss from the room, the devireg 550 knows
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when to start heating in order to achieve the selected
temperature at exactly the right time.
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