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RF 3-way Light Switch for Garage Door Opener

daen | Posted in Construction Techniques on September 28, 2014 01:17am

I am getting ready to install garage door openers in my workshop. One of the options availabe from the manufacturer is a replacement light switch that will turn on the overhead lights when the garage door is activated. However, this replacement switch specifically states it is not for 3/4 way installations. Of course that affects me – I have a 3-way switch configuration.

I can’t be the first person to run into this. Is there a straight-forward fix? I could not find a 3-way compatible switch on the Liftmaster websight. Are there switch manufacturers that make a remote unit compatible with the Garage Door Opener system?

Thanks, DC

Reply

Replies

  1. DanH | Sep 28, 2014 01:49pm | #1

    Just rely on the light on the unit.  It should remain on for 60 seconds or so -- long enough to get out and turn on the overhead light.

  2. gfretwell | Sep 28, 2014 06:08pm | #2

    Hook that switch up on the load side of your 3 way switch system. It willl be a logical "or". You may need to run an extra wire tho, depending on how the switch loop is wired. Do you have a diagram of it?

    1. daen | Sep 29, 2014 12:59am | #3

      Greg,

      If I recall, the feed from the circuit breaker travels to the first 3-way switch, the two wires from that switch to the second, then to the fixtures.

      1. DanH | Sep 29, 2014 08:01am | #4

        What you'd have to do is find the "load" wires (the wires feeding the lights themselves) and connect another wire that goes Hot -> GDO connection -> Black wire of "load".  Unfortuneately, given how 3/4-way switches work there are lots of ways to get it wrong (read smoke and sparks), so you'd really need to know what you're doing.

        1. User avater
          MarkH | Sep 29, 2014 08:34am | #5

          Really Dan...

          That's a pretty useless reply, other than telling him he really needs to know what he's doing.

          1. DanH | Sep 29, 2014 08:53am | #6

            Which was the point -- it's not simple.

          2. User avater
            MarkH | Sep 29, 2014 04:29pm | #9

            I couldn't figure out what a GDO was, for quite a long while.  ACRONYMS SUCK for me!

        2. daen | Sep 29, 2014 10:46am | #7

          So I need an independent circuit that bypasses (in parallel with) the two three-way switches. This circuit would feed from  the breaker to the lights and be switched by the RF switch.

          No, I'm not an electrician by trade or training. But I am an engineer that managed to design and build this entire workshop including the wiring. I may not know the "trade lingo" but with a little guidance I can usually "git r dun".

          Thanks, DC

      2. gfretwell | Sep 29, 2014 10:47am | #8

        If that is the way it is wired, you need another wire. The only other choice would be if they make a 3 way replacement RF switch

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