Danfoss RET M Instructions D'installation page 6

DIL switch settings
GB
Slide the DIL switches to the settings required.
ON/OFF - boiler switches ON when below set temperature and
OFF when above.
CHRONO - energy saving feature which fires the boiler at
regular intervals to maintain a set temperature, achieving a
constant ambient environment for the user.
6
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use 6 Cycles for radiator systems.
o
use 3 Cycles for underfloor heating.
o