Open following link to identify SA150 single pole 15-minute countdown timer rated for 1 Hphttp://waterheatertimer.org/Sylvania-timers-and-manuals.html#countdown
Timer has 3 wires:
Timer-Black wire connects to Hot from breaker. One of the old switch wires is Hot. Hot is usually black wire, and will test for 120V when tested to ground wire.
Timer-Blue wire connects to Load wire going to light/fan/motor. The Load wire is other wire that connects to old switch.
Timer-White wire connects to white Neutral wires. This will power the timer electronics. Neutral wires are the white wires that are twisted together and covered with wire nut and pushed to back of box.
If box does not have Neutral wires, then connect Timer-white to bare ground wire until you have time to bring neutral wire to box from any nearby outlet. Wiring timer to ground in this manner is not code.
Turn power on. If timer does not work, then reverse Timer-Blue and Timer-black and see if timer functions correctly.
If Sylvania timer will not function, then call 888-548-4484
If you want electronic countdown timer that requires no neutral wire, then select 1 Hp spring-wound timer, or 1/6 Hp Leviton-LTT
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