Danfoss RET 230 HCW-1 Instructions D'installation page 7

Commissioning
Prior to re-fitting the thermostat to the wallplate, the DIL
switches on the rear of the unit must be set to the desired
setting.
DIL Switch options, shown in factory set position
(all switches in On position)
Sw On
4
CHRONO 6
3
2
1
ON/OFF
˚C
CHRONO
CHRONO 3
˚F
7