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run-back timer?

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  • 12-07-2012 11:45am
    #1
    captainzero
    Closed Accounts Posts: 35 ✭


    in what way is a run-back timer different from others? wanting to fit timer for immersion heater preferably as replacement for on of switch. can anyone recommend proper one (uk regulations)? i have this rbt1 but it dont look like suitable for that job. thank you


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    #2
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    if you mean this one
    http://www.cpelectronics.co.uk/energy-saving-product/timers/multi-range-timers/rbt1

    it allows you to switch on the immersion 'immediately' for up to 2 hrs

    rather than setting it to heat at a particular time of day


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    #3
    ed electrical
    Registered Users Posts: 11 ✭ed electrical


    The big thing about run back timers is they switch of automatically. So you press for the time you want. Mine let's you run it for •5 hour, 1 hr or 2hours. Then it switches off.
    so no worries about leaving it on for longer than you want.


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    #4
    chiefness
    Registered Users Posts: 11 ✭chiefness


    captainzero wrote: »
    in what way is a run-back timer different from others? wanting to fit timer for immersion heater preferably as replacement for on of switch. can anyone recommend proper one (uk regulations)? i have this rbt1 but it dont look like suitable for that job. thank you

    If your interested in doing something a bit fancier then I would reccomemd isolating your immersion by means of a suitable power relay. In doing this it will future proof your options and also cut down on maintence costs. Migrating your direct load switching from a black box/switch device wil allow you to control your immersion from a variety of devices. For example on a basic level you could send a text message to turn on the immersion when you are leaving the gym.


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    #5
    Steve
    Moderators, Category Moderators, Entertainment Moderators, Sports Moderators Posts: 22,584 CMod ✭✭✭✭Steve


    There are also one-shot immersion switches out there. No idea of who supplies them but remember seeing them a few years back.

    Basically, you press a start button and it keeps the immersion on until the stat switches it off because the tank is hot enough.
    It detects the current drop due to the heater being off and drops out the relay until the next time you press it.
    It's much more efficient than the 1hr boost button on most regular timers.


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    #6
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    be alright as long as the stat doesn't stick


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    #7
    Steve
    Moderators, Category Moderators, Entertainment Moderators, Sports Moderators Posts: 22,584 CMod ✭✭✭✭Steve


    If the stat sticks then you've bigger problems as it'll boil the water no matter what you're controlling it with. :)


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    #8
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    M cebee wrote: »
    be alright as long as the stat doesn't stick

    It would work well with a timed cutout as backup.

    I made a run back timer using a microcontroller and relay setup, for the laugh, for the central heating. 3 leds for 1 to 7 hours binary setup. Was sick of the mechanical timer on the boiler sticking.

    Works well though.


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