Any recommendations on how much my 3/4" ball valve should be open on my UDS with the fan mounted to it. I only have a 30cfm fan and I need to reduce the cfm. Any recommendations other that getting a smaller fan. Thanks.
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PID Controller on UDS
- Thread starter jabbey71
- Start date
I'm not sure how anyone could answer your question with any degree of certainty. All drums are a tad different- and you are tossing a PID gizmo into the mix. Do a dry run and try different settings maybe? Should be able to figure it out in an afternoon.
good luck.
good luck.
AussieMatt
Babbling Farker
Just tossing this out there...when you run a PID, it turns the fan on and off as it required, yes?
If that's the case, does it really matter what cfm the fan is or is it really blow too hard that something bad is happening?
I'd just run it the way it is with the valve open 100% but Nuco hit the nail, run it in different positions and you'll know for sure where you should set it.
If that's the case, does it really matter what cfm the fan is or is it really blow too hard that something bad is happening?
I'd just run it the way it is with the valve open 100% but Nuco hit the nail, run it in different positions and you'll know for sure where you should set it.
Porcine Perfection
is One Chatty Farker
The logic of the PID is to adjust the temperature on the fly so theoretically you should be able to have the ball valve at any position (besides closed of course) or even changed during the cook. I would keep it at 100%. If your PID adjusts the speed of your fan you might want to close the valve a bit if you are experiencing overshoots.
PDPatterson
Knows what a fatty is.
Sent you a PM
Bbq_lover
Full Fledged Farker
I agree that you should run the valve all the way open. I use an iq110 and I open the valve and let the controller do its job.
Sammy_Shuford
is Blowin Smoke!
With a fan, you still have some natural draft. I found (especially on windy days) that I needed to shut down the intake some.
Experiment, and see what works well for for YOUR drum.
Experiment, and see what works well for for YOUR drum.
A 30cfm fan is definitely too large for a UDS. I even dampered down a 10cfm when using it. And as people above mentioned, you will find that when the fan isn't running, a natural draft through the fan will occur.
The logical thing here would be try the valve half open first and see if it works ok.
Constantly overstoking your fire and overshooting your temperature is a sign that it needs to be throttled down even more.
The logical thing here would be try the valve half open first and see if it works ok.
Constantly overstoking your fire and overshooting your temperature is a sign that it needs to be throttled down even more.
I've got an idea of how I can restrict the flow. My PID controller is a MYPIN T4a. I'm going to set my sv temp to 250 degrees and does anyone have a good recommendation of what temp I should let the cooker get to before I set the autotune. I know that in the autotune mode it will probably overshoot and take some time to program but I didn't know if I should set it at a low temp or maybe 50-75 degrees before it gets to the sv temp. Any suggestion would be very helpful.. Thanks.
I know this is not an answer to your PID questions: valve settings, fan cfm, autotune, when to turn it on, etc. But have you given any thought to just runnin' it nekkid?
UDS is a pretty tame beast- it's like the "crock pot of cookers". Gizmo's are cool but... just seems like a lot of bother for little need or reward, IMO.
That unsolicited (and probably unwelcome) comment aside, good luck in your search,.
UDS is a pretty tame beast- it's like the "crock pot of cookers". Gizmo's are cool but... just seems like a lot of bother for little need or reward, IMO.
That unsolicited (and probably unwelcome) comment aside, good luck in your search,.
