T104R3 is ordinary 240V T104 timer mechanism inside a beige metal weathertight enclosure.
Put ON-OFF trippers on dial, lift and rotate dial until current time lines up with silver pointer.
Reset current time after power outage.
Open following links for T104 Instructions:
http://waterheatertimer.org/pdf/Intermatic-t104-240V.pdf
http://waterheatertimer.org/How-to-operate-and-set-T104-timer.pdf
Open following link if you have T104R201 with fireman's switch
http://waterheatertimer.org/pdf/Intermatic-T104R201-instruction-manual.pdf
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
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