Advice on Wiring a Mist-a-matic

Bradybb(wa8)August 22, 2012


I have a used Mist-a-matic that didn't come with a transformer or solenoid,so I purchased them.I have enough electrical knowledge to make me dangerous.With that,if anyone has a Mist-a-matic/Electronic Leaf or has electrical know how that could give me some help,I'd be very appreciative.

The transformer is 120VAC input and 24VAC output and the solenoid is a 24volt Orbit Jar-Top sprinkler valve.

The main unit has an electrical cord with two wires from it on each side of the switch,and a ground going to the frame.

I'm thinking of connecting the wires at the other end of the cord,white and black,to the transformer.Not sure about the ground,as the transformer only has two screw connections and two prongs that plug into an outlet.

Do the two wires coming from the solenoid also attach to the transformer connections?This is my interpretation of how I should proceed.Please correct me if I'm wrong.

Thanks,I hope my way of writing this makes some sense. Brady

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Don't know what this is - I guess the Mist a Matic is the switch ? that will turn the solenoid on/off ?

If so you only need to have it on one side of your circuit.

So one way to connect is +power of transformer connected to one lead of mist a Matic and the other lead of the MaM goes to the solenoid. The -Power (or ground) would connect to the solenoid directly.

The only ? I would have is how much current the MaM can handle - it may not be designed to act as a 'relay'. Similar switches made for rainfall detection are used as an input for a Sprinkler Controller - but the controller has the relays which can actually switch the relatively high current used by the solenoid.

    Bookmark   August 24, 2012 at 1:26PM
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googled mist a matic - so it is a simple mercury switch which should be able to handle the current for the solenoid.

    Bookmark   August 24, 2012 at 1:30PM
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Thanks for responding and helping chad.Yes it is a mercury switch.
"The -Power (or ground) would connect to the solenoid directly."Does that mean it connects to one of the two wires at the solenoid and if so,can the green ground wire coming from the unit's housing be attached to the -Power of the transformer also? Thanks,Brady

    Bookmark   August 25, 2012 at 2:19AM
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ken_adrian Adrian MI cold Z5

i believe this post is a followup post to the one at the link .. perhaps chad didnt catch that


Here is a link that might be useful: link

    Bookmark   August 27, 2012 at 11:43AM
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I should draw something but I'm lazy :) I only see 2 wires coming from the MaM - one white and one green.

I'll try in ASCII...

transformer +)--------white---MaM---green------> Solenoid

transformer -)-------------------> Solenoid (other)

A mercury switch can be a glass bulb with mercury inside and 2 metal prongs inside the bulb, when it tilts the mercury contact the 2 prongs and completes the connection.

    Bookmark   August 28, 2012 at 2:21PM
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Okay thanks a lot Chad,I hooked it up from your previous info and it worked.I just came online now and saw your recent post.
I pushed the end of the ground(green),coming from the MaM,into the socket ground hole,where the transformer plugs in.
I was concerned about it not working,because the valve is a normally closed type,but when I talked to a guy at a place that sells them,he said to just flip the mercury switch around and it will work.It turns out that it wasn't needed,as probably the previous owner had already done that and it works perfectly.Again,thanks very much. Brady

    Bookmark   August 28, 2012 at 3:42PM
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Also,the picture doesn't show it,but there is a black wire also coming from the MaM.The green is a ground that is screwed to the MaM frame.The black is going to one side of the switch.
Here is a clearer picture.

    Bookmark   August 28, 2012 at 3:58PM
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That post is my other system before the Mist-a-matic.That is still running but the Mist-a-matic is so much more precise.
Here is what the pond fogger setup looks like now.
I added another fogger because the cuttings were drying out a little too much when it is hot.Brady

    Bookmark   August 28, 2012 at 4:26PM
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