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Thread: Auto Top Off

  1. #1
    Moderator ShipWreck's Avatar
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    Auto Top Off

    I want to build an auto top off system, finally, so I can actually leave the tank for more then a day.

    I have 2 floats from Ivan and know how to wire the circuit, but can someone tell me where to get the solenoid valve to control the water from the RO unit?

  2. #2
    Senior Member Serge's Avatar
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    You can look at places like Home Depot, Rona, Reno Depot, Canadian Tire, gardening centers. The one I have is for an auto watering system for lawns. This one runs on 24 VAC. Many types are available. HTH

    Serge

    Common Sense - Is'nt!!


  3. #3
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    Tang_man_montreal makes top-off control units. If my memory is accurate, he posted a wiring diagram for them about a year ago. The trick is to wire the float switch so that you don't flow 120V through it. Rather, you set-up a 10V DC circuit for the float value which is used to control a secondary circuit to provide power to the 120V AC pump.
    Nick

  4. #4
    Senior Member tang_man_montreal's Avatar
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    Shipwreck,
    As NickB stated, the wiring diagram is on here somewhere.

    As for the solenoid, the one I'm currently using is from www.mcmaster.com, P/N: 7877K53

    It's about $35 Cdn with shipping.

    However, I think that Ivan here at AC will soon be carrying solenoids at a cheaper cost very soon...
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  5. #5
    Moderator ShipWreck's Avatar
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    Thanks tang_man. That is exactly what I was after.

    Ivan, are you going to be carrying solenoids?
    Rob
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    Upgrade in the works! Keep looking for an update.


  6. #6
    Moderator ShipWreck's Avatar
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    I got the solenoid from McMasterCarr now and have two floats from Ivan. The valve I got is the 12vDC model. And now need some more help.

    I will have the solenoid control the output of my RO unit with the 2 float valves to a kalk reactor (soon), and entering the sump through a kent float valve, so no pump being controlled.

    My question then is do I run the 2 switches in series (for backup) or parralel (for safety)? and can I just use a 12v power supply directly throught the switch to the valve or do I need a debouncing circuit?
    Rob
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    Upgrade in the works! Keep looking for an update.


  7. #7
    Moderator ShipWreck's Avatar
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    Anybody have any ideas?
    Rob
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    Upgrade in the works! Keep looking for an update.


  8. #8
    Senior Member Deafboy's Avatar
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    I would use the second switch to prevent overflow and a water spill.

    The switch is rated 1 A and the solenoid is 0.5 A, so you're Ok without using a relay.

    I don't use a deboucing circuit. I DO use a device around the float switch to prevent the switch turning off and on with each passing wave. It's a modified plastic bottle which a little bigger than the switch. There's a small hole in the bottom of the bottle to let water enter it. I guess you could call it a hydraulic low-pass filter. Look at the picture below for the float switch in the pill bottle. The whole shebang is placed inside the my Remora prefilter.

    20 g reef, 72 g reef

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