I freshly purchased a Honewell Timer Switch from Amazon. The instructions that came through it for replacing an existing 3-Way switch don"t job-related. Here is how to install it in location of an existing 3-means switch.

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Working instructions

The timer switch will replace among the 2 existing light switches. The various other switch will certainly should be re-wired.Turn off the circuit breaker and verify tright here is no power in the switch boxes.Identify which switch box is connected to the load (the lights) and also which is linked to the hot (power).a. Each switch box will certainly have actually 2 black wires.b. The black wire that originates from the same bundle as the red wire is a traveler.c. The various other babsence wire in each box will certainly be either the warm or the pack. Disattach these wires from the existing switches, rotate the power earlier on, and also test which one is hot.d. Turn the power earlier off when done with this action.You do not have actually enough traveller wires to install the timer in the box via the power, so put it on the side with the pack.Wire the timer:a. Timer blue to pack blackb. Timer white to bundle of whitec. Timer yellow to red travelerd. Timer black to black travelerRewire the second switch.a. Disaffix the babsence traveler and also affix it to the babsence warm wire. Either screw it under the same screw, or create a tail as portrayed listed below.b. Make certain to usage one black screw and also one gold screw on the switch. Leave the second gold screw with nopoint connected to it. It doesn"t issue if the red gets connected to the babsence or gold screw as long as the babsence wires are connected to the various other shade.

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Why this works

In a normal 3-means switch, the switch uses mechanical action to choose which of the two travelers (red and also black) has actually power at any type of given time. The timer switch has an electronic relay (rather than something mechanical) to rotate the power to the load on and off. It constantly needs power coming in on its black wire to power these electronic devices. It senses a change in state on its yellow wire and electronically switches the state of the blue pack wire (light).

When this 3-way configuration is functioning effectively, the remaining mechanical switch is not being used as a 3-method switch. You could relocation it with a cheaper single-pole switch and reusage the 3-method switch elsewhere. For wiring functions, a single-pole switch is missing the second, unused gold screw compared to a 3-way switch.

Honeywell"s Instructions

The switch from Honeywell comes through a jumper wire.

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The wiring diagram they provide shows it throughout 2 screws of the 3-means switch.

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There is no means that is going to occupational. That is going to reason the 3-means switch to provide power to both the black and also red travelers all the time.

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You deserve to rather transform the jumper right into a tail. Cut one end off and also spilgrimage it. Use it to affix the warm wires in addition to a wiring cap and put the other end on the 3-way switch as illustrated over.