fan timers

Discussion in 'Electronics & Electrics' started by Pugs, Feb 25, 2020.

  1. Pugs

    Pugs Member

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    so i have kids and they love to turn things on but not off.. and I have already had an old toilet Exhaust fan burn out on me... what would be the best way to get a fan to turn off after say five mins of running...

    new fixture is a led light and fan all in one with circuits for both

    access to add extra cabling to add a switch is not possible as it is an internal brick wall that is tiled floor to ceiling

    main board is like 15m away old one but will be upgrading it this year
     
    Last edited: Feb 26, 2020
  2. aXis

    aXis Member

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    Try getting a replacement dual wall switch that has home automation built in. You should be able to remotely monitor it from another PC / RPi running nodered, then issue commands to turn it off after some time.

    I used to do this with z-wave micro-module units but got sick of the poor performance ripped most of them out. Wifi might be a better option these days, eg:
    https://www.amazon.com.au/Activatio...aterproof/dp/B07VR7B52D/ref=asc_df_B07VR7B52D or
    https://www.auselectronicsdirect.com.au/smart-wi-fi-white-double-gang-wall-switch

    The second one seems to have a timer function built in.

    Note - you might need to have a neutral wire drawn into your wall plate.
     
  3. power

    power Member

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    is chopping their hands off not an option?

    fan burning out like this is pretty rare i would imagine. Something with an electronic rather than a regular switch will survive aggressive switching. So get one with a remote.
     
  4. OP
    OP
    Pugs

    Pugs Member

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    unfortunately it isn't... their mother told me i couldn't do that...

    it was full of that old school blown in Insulation aswell.. so that didn't help it one but but left running for 40 mins or so didn't help either
     
  5. power

    power Member

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    left running for 40 minutes!?

    what fan is this that can't survive 40 minutes???
     
  6. OP
    OP
    Pugs

    Pugs Member

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    a really old one....
     
  7. power

    power Member

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    now i'm extra confused - what exact fan is this.

    I thought you were referring to a ceiling fan.
     
  8. OP
    OP
    Pugs

    Pugs Member

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    an exhaust fan in a toilet
     
  9. power

    power Member

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  10. OP
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    Pugs

    Pugs Member

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    This is the current switch and hole...
     

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  11. HSV_Enigma

    HSV_Enigma Member

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    Just buy a good quality exhaust fan, they should be able to run at 100% duty cycle, I certainly have never had one burn out. Or create a 1 shot timer circuit at the fan power supply, something as simple as a 555 timer that picks and holds a relay after 10 minutes will do it.
     
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  12. mAJORD

    mAJORD Member

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  13. power

    power Member

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  14. mAJORD

    mAJORD Member

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  15. OP
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    Pugs

    Pugs Member

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    alternatively is there a way for a timer on the fan to run for say five mins after the light is off so the air is fresher in said room for the next use?

    or would that require a whole lot of messing around??
     
  16. Technics

    Technics Member

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    Yes and no. https://ventair.com.au/product/run-on-timer
     
  17. Technics

    Technics Member

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    Also looking at your switch it looks like the typical "loop at the light" wiring with a switched active has been used. I believe that by rights the colours should be red and white but it's not uncommon to see red and black (because that's what's in twin TPS). So the timer would need to be installed up at the light/fan (by someone qualified to do so obviously) and the kids would just need to remember to turn off the light.
     
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  18. merlin13

    merlin13 Member

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    Silly Concept that'll initiate a flame war - apart from fitting a new fan that'll run without burning out, worth investigating training the spawn to turn things off when they've finished?

    Else if they can't be trained then consider fitting a motion sensor in The Smallest Room Of The House there with associated fan timer.

    And/or if you have to go to that extent, ponder going the extra distance to wire the light in as well and disable the wall switch. That'll save you the long-term hassles of the light burning out if the spawn won't turn the light off...
     
  19. Symon

    Symon Castigat ridendo mores

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    For that you would need an 'off delay timer'. Not hard to do.

    As Technics has pointed out, it has been wired without a neutral at the switch, so unless you want to pull in a new wire you are stuck with the pneumatic time switch that mAJORD linked to.
     
  20. ArmoureD

    ArmoureD Member

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    Also that wall box is the architrave size crap. Was popular to use that in the 70s. The switches pointed out will not fit, so you'll need to fit a mounting block which may make the wiring way shorter.
     

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