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Fan timer with "stay on" option

Discussion in 'General Electronics' started by Lacustral, Jul 31, 2007.

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  1. Lacustral

    Lacustral Guest

    Is there a fan timer that has an option to just leave it on? I'm planning
    to get a bathroom fan, but I also want to be able to just leave it on, to
    use it to clear air out of the house generally. The fan wouldn't be more
    than about 2 amps.

    I'm sure it's also possible to set up a circuit to bypass a timer that
    doesn't have a "stay on" switch. How would one do that?

    I want a quiet fan timer. Someone told me of a timer which goes up to
    12 hours, but they said it makes noise. So something electronic, maybe.
    Something quiet that goes up to 12 hours would be fine, as long as it
    also lets you leave the fan on for only a few minutes.

    Such a thing wouldn't have to be a *fan* timer specifically, any timer
    that has a "stay on" option that is good up to 2 amps or so would work.

  2. Arfa Daily

    Arfa Daily Guest

    I don't know whereabouts you are, but here in the UK, such an item is
    commonly available as a shower extractor fan with a built in light EXTRACTOR FAN-_-25652&ts=10039

    It is hooked into the normal lighting circuit, and as long as the light is
    on, the fan runs. When you switch off the light, the fan continues to run up
    to an adjustable time of 20 minutes

  3. Lacustral

    Lacustral Guest

    Arfa Daily () wrote:

    That's interesting. I don't want to leave a light on when the fan is
    running, but I wasn't going to have a light hooked up to the fan anyway.
    Sounds like I could use such a switch on a fan, without a light, and
    leave the switch on if I want ventilation overnight, say. I wouldn't care
    if, when I go turn the fan off, it keeps on running for a few minutes
    after I switch it off.

    Thanks. You may have come up with a creative solution that the fan
    company tech support didn't.

    I live in the USA.

  4. Jasen Betts

    Jasen Betts Guest

    wire an ordinary switch in parallel with the timers contacts
    the cheapest timers are clockwork and do 'tick', but probably make less
    noise than the fan - they're quiet enough to use in classrooms etc...
    I've also seen timers used to control lights and heating

  5. Arfa Daily

    Arfa Daily Guest

    There's no reason that you could not run this particular fitting without the
    lamp installed. It employs a switch mode power supply, which doesn't care
    much whether it's got the combined load of both the fan and lamp, or just
    the lamp on it. I'm sure a similar unit would be available through Home
    Depot or wherever.

  6. Bill Jeffrey

    Bill Jeffrey Guest

    Seems to me this is the easy, cheap, and obvious answer. The fan timer
    would normally be mounted in a single-gang outlet box. However, you
    would install a dual gang outlet box in your wall. Mount the fan timer
    in one half, and a plain ol' ordinary light switch in the other half.
    Wire the two devices in parallel. (That means that the incoming
    black/hot power wire should be connected to one terminal on the fan
    timer, AND one terminal on the switch. The outgoing black/hot wire is
    connected to the other terminal on the fan timer, AND the other terminal
    on the switch. If the timer is electronic, it may call for a connection
    to the white/neutral wire. Both the timer and the switch may have
    connections for the bare/ground wire.)

    The above covers US installations. Just noticed you are in NZ. The
    connection theory is the same, but I am not aware of NZ wire colors.

  7. neon


    Oct 21, 2006
    Many stores sells timers an eggs timer while mechanical will provide the time needed to cleaqn air. i installed in my sauna it works great it operate and tells me when to get out.
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