Open following link to identify timer:
http://waterheatertimer.org/pdf/Intermatic-PB800-PB900-timers.pdfThe timer has 4 terminal connections.
2 terminal connections are for the clock motor, and 2 terminals are switched just like ordinary light switch.
See how to connect terminal ends to electrical wire by crimping:
http://waterheatertimer.org/Terminals.htmlWhich 2 terminals are for clock, and which 2 are for switch?
Test across both sets of terminals using continuity tester or multimeter set to read ohms.
Then rotate override knob to next position, and repeat test on both sets of terminals.
The set of terminals that changed when override was rotated are the switch terminals.
The other set of terminals are the clock terminals.
Connect 120Volt Hot and neutral to the clock terminals. Turn on power and make sure clock dial rotates.
Next: the cable going to Load has 2 wires: Black and white.
Cut the black wire. Crimp terminal connections on each end. Connect each end of black wire to the switch terminals.
To set timer for on-off operation, open following link:
http://waterheatertimer.org/How-to-set-timers.html
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