While there isn't one "definitive" long-form article on the Diehl Multi Timer 181-5 , this model is widely recognized as part of the Diehl Series 884
Connect to the load (e.g., boiler, pump, light). This contact closes and passes power when a timer segment is pushed in/out. diehl multi timer 181-5 pdf
Typically 30-minute segments (segments pushed in or out to set ON/OFF times). Voltage: Standard 230V AC, 50-60 Hz. While there isn't one "definitive" long-form article on
Setting the switch to I forces the timer to stay permanently ON. diehl multi timer 181-5 pdf