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Old 07-04-2011, 01:05 PM   #1
bowhuntah
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Sorry if this has already been covered but what is the best way to control two elements in one kettle? Can I control two elements with one PID?

 
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Old 07-04-2011, 01:07 PM   #2
jmer1234
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No, you will need a separate controller for each element.

Edit:
The question is, though, why do you want to have independently controlled elements?

Edit, Edit:
Unless you are not trying to independently control the 2 elements. In which case yes. You will need to make sure your circuit/ssr can handle both elements, and then just wire them up. Or use 2 SSRs, but still make sure your circuit can handle the load.
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Old 07-04-2011, 02:27 PM   #3
bowhuntah
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No, I don't want to control them independently. My boil kettle will have two elements (two 5500w on a 60amp circuit). I want to be able to control them as if they were one. So one PID with a SSR for each element?

 
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Old 07-04-2011, 02:33 PM   #4
jmer1234
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That is what I would do. Or use a higher amperage SSR. Typically, I am using a 25 amp ssr to control 1 element. But a 40 amp ssr should be able to handle 2, just do the math based on your voltage/heater element max watts to make sure.
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Old 07-04-2011, 02:43 PM   #5
bowhuntah
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Just realized my last question wasn't so clear. Is a PID required for each element?

 
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Old 07-04-2011, 02:50 PM   #6
jmer1234
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No, you should be able to run a single PID. But I was just doing the math. If you are runining 110 Volt, you can get away with a single 40 amp SSR, but if you are running 220 Volt, you will be pushing 50 amps with 2 heater elements, and will need 2 40 amp SSRs or an appropriately sized single SSR (greater than 50 amps - leave yourself a little head room). I may edit this as I am still checking the math.
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Old 07-04-2011, 02:54 PM   #7
bowhuntah
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I'll be going 220. I could possibly down size the elements. They will be going in a 45 gallon BK.

 
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Old 07-04-2011, 04:45 PM   #8
P-J
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bowhuntah,

Been following your thread and the idea intrigued me, so I decided to illustrate a diagram for you that might clarify the wiring.

(Click on the image for a full scale diagram that can be printed on Tabloid paper 11" x 17")



Switches 1 & 2 are placed to positively isolate the element power from your kettle during setup or whenever needed. The EPO circuit is designed to trip the mains GFCI breaker in the event of an emergency.

Hope this helps you.

 
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Old 07-04-2011, 06:45 PM   #9
bowhuntah
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Thank you, that helps a lot!!!

 
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Old 07-04-2011, 06:50 PM   #10
bowhuntah
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With switches 1 & 2 on, the elements hot even when the relay is not energized?

 
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