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Old 05-17-2012, 10:53 PM   #1
danmeljeff
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Default 220V --> SSR --> 5500W Heating Element Question

I'm in the process of building my electric brewery. I've been researching the various ways to supply power to the heating elements (1x SSR, 2x SSR's, Switch to Mechanical Relay to SSR).

It seems like using a switch and mechanical relay is the preferred method, mostly due to safety.

My initial thought was to run both hot leads to the L1 post of the SSR, and then from the T1 post, split the wire and connect it to each post of the heating element. Since there is no neutral wire in play (just a ground wire), I can't see why this wouldn't work.

Having not seen anybody else wire it up this way, I'm fairly certain it isn't appropriate. However, I'm hoping someone can tell me why.

Thanks,

Jeff

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Old 05-18-2012, 02:04 AM   #2
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I don't think I follow what you have in mind - can you post a drawing?

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Old 05-18-2012, 02:20 AM   #3
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I may not quite understand what you are saying, but DO NOT run both hot leads to one post on the SSR... they'll short out and trip your breaker. You want to run one of the hots through the SSR, the other connects directly to one side of the element. The manual switch (I have a 30 amp Double pole double throw switch) is for turning off both sides of the 220V feed.

When you cut one of the hots the element will be inactive. With my element you can touch the wort, element etc when one hot is cut, but cutting both when you are going to mess with it is a good idea none the less.

Also I really recommend having a GFCI breaker or some sort of GFCI in line to protect you further.

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Old 05-18-2012, 02:28 AM   #4
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Here's my example of a similar setup:

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Old 05-18-2012, 02:33 AM   #5
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excuse the drawings...unfortunately, it's the best I could come up with. Also, I know I left out the ground wires...just trying to simplify it.

My proposed method:



Suggested method using 1 SSR:


Thanks in advance for the enlightenment I'm sure I'm about to receive :-)

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Old 05-18-2012, 02:34 AM   #6
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l3asturd; your diagram is identical to Kal's design (theelectricbrewery). It's a good design.

To the original poster; what you're talking about is a dead short, and certainly will not work. It also shows a dangerous lack of understanding. Please, please do a lot more research before you start fiddling with this stuff. Be safe!

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Old 05-18-2012, 02:55 AM   #7
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OP: Although those two wires are both 120V (wrt gnd), they are AC and 180 degree out of phase. Like previous posters said, it's a dead short.

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Old 05-18-2012, 02:30 PM   #8
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You can't run both legs of your 240 off one post on the ssr. Putting both there will cause a short and probably some fire. Basically the ssr controls one leg while the other is constantly there. You should have a switch between the ssr and element as well, so the element gets no power until you are ready to start heating water.

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Old 05-18-2012, 03:49 PM   #9
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or you could just get a dual output relay to control both hot legs like this one

http://www.mouser.com/ProductDetail/...9xaE0LNJOrs%3d

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Old 05-18-2012, 04:08 PM   #10
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For added safety I, and others interrupt the red line in your second drawing with a Mechanical relay. I have this relay, but there are others you can use. I control it with a selector switch that will close it when I want power to that element. I have a micro controller (BCS-460) that controls the SSR, which is the main controller for the element.

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