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Old 12-25-2010, 05:28 AM   #1
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Default Please review my wiring scheme for brewery

Here are my plans for wiring my brew stand. I may hav went a bit overboard on the switches, but wanted to insure the element would not fire without the pump running thats why its inline with the Mash pump switch.

Let me know what you all think.


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Old 12-25-2010, 06:21 AM   #2
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Is this a 240VAC circuit or 120VAC? Is your element 240? I'm assuming it is and therefore you are pulling the running current for the element through the PID and the SSR. If your intent is to drive the SSR with the PID, the current should be drawn through the SSR only as it has the high current capability.

If you want to insure the element doesn't fire without the pump, put in a flow switch, unless that is what the switch contacts are before the PID.

Guess I just need a little more detailed drawing??


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Old 12-25-2010, 12:30 PM   #3
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As drawn, you are not providing any power to your heating element. The SSR is intended to control it, however, you have not illustrated the power source to the SSR and element.

I would also power up the PID independently so that at least you could monitor temperatures.
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Old 12-25-2010, 07:22 PM   #4
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what you actually want is a 3 way switch between the PID and the pump, so you have pid/on/off. you'll also need power to the pid all the time, and power to the heating element (through the SSR just like a relay it's 2 sets of wires, one for power to the device, one for the power the device is delivering).
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Old 12-25-2010, 08:46 PM   #5
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Thanks for the suggestion guys! Does this make more sense?
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Old 12-25-2010, 08:51 PM   #6
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that looks better to me

dunno if you really need the switch between the SSR and the element... but could be good for a safety issue.
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Old 12-25-2010, 11:36 PM   #7
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yeah, that switch is not necessary but i wanted to be able to shut the element off if i ever needed to. What i'll probably do is make sure i have wort recirc'ing well before i turn the element on.

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that looks better to me

dunno if you really need the switch between the SSR and the element... but could be good for a safety issue.
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Old 12-26-2010, 05:04 AM   #8
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I'm not sure you are achieving your goal of ensuring the element doesn't fire when the pump isn't running. If you want to prevent the element from running when the wort pump is off you should put a relay in line with the element or SSR feed. The relay would be switched by the wort pump current.
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Old 12-26-2010, 06:43 PM   #9
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yeah, instead of coming off the MAIN power to the ssr, i could pull the power from after the mash pump switch.

I think the manual switch before the element shoul dbe good enough.

I could aslo use a double poll single throw switch. That way when i start the pump i can send a signal to thee ssr.

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I'm not sure you are achieving your goal of ensuring the element doesn't fire when the pump isn't running. If you want to prevent the element from running when the wort pump is off you should put a relay in line with the element or SSR feed. The relay would be switched by the wort pump current.
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Old 12-26-2010, 06:51 PM   #10
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I think this thread belongs in the electric brewing section... maybe not though.


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