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Home Brew Forums > Home Brewing Beer > Electric Brewing > Relay question
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Old 01-30-2012, 05:59 PM   #1
flatulentfox
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Default Relay question

I am in the process of building a full electric RIMS system. I plan on using a HWD 4500W or 5500W 220V element in the RIMS tube. I am going to use it at 220V to heat strike water or possibly other uses where I am just heating water (sous vide cooking?). I want to switch it to 110V and use it as a ULWD element whenever wort is involved. I plan on using a low voltage toggle switch in my control panel to switch a double throw relay to switch one leg of the element between line and neutral, giving me either 220V or 110V.

My question (or request) is: help me find a suitable relay. Preferably I would want a 12VDC coil, with contacts rated for at least 30A at 220V. I could use 110V for the coil if i had to.

Do you think either of these would work?

http://www.amazon.com/Potter-Brumfie...d_sbs_indust_3


http://www.amazon.com/gp/product/B00...&pf_rd_i=typ01



Also, any input on using a 5500W HWD 220V element at 110V? This will be a keggle system capable of 5-10 gallon batches.


Thanks
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Old 01-30-2012, 11:38 PM   #2
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Here's your relay.

http://www.grainger.com/Grainger/DAY...847?Pid=search
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Old 01-31-2012, 12:12 AM   #3
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Quote:
Originally Posted by yjfun
Just an fyi. I would take that part number and call around. Grainger around my way is always the most expensive place. I was going to order a light from them and came to find out it was $175 more than rexel down the road from me. And the stores r 15 miles apart!
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Old 01-31-2012, 12:16 AM   #4
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Most definitely call around. Any of your local electrical supply houses should stock this relay you just can't look things up on their web sites so I use grainger for that.
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Old 01-31-2012, 04:44 AM   #5
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Awesome. Thanks. I work right across from a Grainger, so even if it is more expensive, the convenience usually pays off. I can walk over at some point during the day (which I do for work often enough anyways...).
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Old 01-31-2012, 02:41 PM   #6
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My bad
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Old 01-31-2012, 03:11 PM   #7
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How would he be requiring 45 amps? 5500w element at 120 volts is 11.5 amps and 1375 watts.
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Old 01-31-2012, 03:22 PM   #8
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Quote:
Originally Posted by yjfun
How would he be requiring 45 amps? 5500w element at 120 volts is 11.5 amps and 1375 watts.
Brain fart, i work too much my bad
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Old 01-31-2012, 03:33 PM   #9
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We all have them sooner or later.
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Old 01-31-2012, 03:44 PM   #10
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Do you plan on controlling the strength of your boil by simply switching between 5,500W (220VAC) and 1,375W (120VAC)? I'm affraid that you won't get your desired results this way; you'll have too strong of a boil at 5500W and a minimal boil at 1375W. I would stick to 220V for boil and adjust the strength using a SSR and PWM combination. Both of them can be had for ~$40 with some minor soldering.
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