Danfoss RET 230 HCW-1 Instructions D'installation page 8

DIL Switch descriptions
Switch 4: If set to On/Off, both heating and cooling operates
Switch 3: Active only if switch 4 is set to Chrono. This
Switch 2: Allows Celsius or Fahrenheit temperature scaling
Switch 1: Not used in this model.
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in on/off mode. If set to Chrono, both heating and
cooling operates in chrono-proportional mode.
switch determines the number of cycles per hour
that the thermostat will impose on the system,
the options are three 0 minute cycles or six 10
minute cycles.
to be selected.