How it works and how to consolidate

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Old 09-28-17, 04:58 PM
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How it works and how to consolidate

Just trying to understand how this all works. Dont worry, I am not going to try something on my own and blow myself up.

These are the burners, natural gas.


This is the thermo coupler, correct? It has been cleaned and wire replaced.



I need 3" wc and have a 3/4" feed line. All that to ask this; everything I have is old and plenty used. Is there a way to safely simplify this setup. I need a gas ball valve, then a gas valve, regulator, ignitor with safety, high temp shut off. I would think thats pretty much it...so i think. What think ye?

Now that you are wondering, its a coffee roaster.
 
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Old 09-28-17, 05:56 PM
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Welcome to the forums.

Dont worry, I am not going to try something on my own and blow myself up.
That's a confusing statement. You say you aren't going to try it on your own but you're asking how to do it.

I place this job beyond a DIY'ers reach.
When it comes to gas.... there is no second chance.

I see an adjustable spark gap for spark ignition and a pilot assembly but I don't see a thermocouple. A thermocouple would have a very thin copper tube or a high heat two conductor cable and go directly to the gas valve.

It is possible that your system uses the spark lead as a flame sensor.
 
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Old 09-28-17, 06:34 PM
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That's a confusing statement. You say you aren't going to try it on your own but you're asking how to do it.
That is correct. Just trying to make this work in my mind, then I'll get someone to do it. We're trying to move away from the automated process that this has.

Spark, not thermocouple, my bad.

How about hot water heater style gas valve, I would think that might be a simple design so long as one can be had for that volume of gas. If there is no flame, the thermocouple shuts off that gas, correct?
 
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Old 09-28-17, 06:39 PM
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I would think that a roaster would be fired up full time when roasting but you have a spark ignition which means it runs un-attended. That means there needs to be safeties in place.
 
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Old 09-28-17, 06:42 PM
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Originally Posted by PJmax View Post
I would think that a roaster would be fired up full time when roasting but you have a spark ignition which means it runs un-attended. That means there needs to be safeties in place.
It runs attended but still needs a high temp shut off or such. I think thats the only safety involved, except if the flame goes out the gas shuts off.
 
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Old 12-05-17, 04:36 AM
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I would recommend that you call a licensed HVAC company and ask the same questions. They could supply you with information, a parts list and the expertise you need to make this a safe operating coffee roaster. I worked on small and very large furnaces and boilers and one mistake or short cut could cost you your life or worse. I have seen too many accidents resulting in severe burns and loss of life due to cost savings. Sorry about my speech.
 
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