Originally Posted by Ostrichsak
Disagree. I've had mine swing temps hours after the preheat phase and some would argue that a better controller/heating element wouldn't have that swing during the preheat phase either. This is the same symptoms of using a heater rated at too many BTU's for the space you wish to heat. When it kicks on it blows right past the set temp before shutting down and if your thermostat is set with improper duty cycle settings it can cool beyond your desired set point before kicking back on again. He's given us a band-aid fix workaround but the problem is still Masterbuilt's.
You have to re-read what I said. I said the biggest over-runs are during the pre-heating, because that is when the biggest run is----Like from 0° to 230° (or whatever).
Then if you don't adjust it with my method, the downward over-run will be big too. and a number of up & down over-runs will be caused each by the fact that the one before made the next one a long run too.
Now if you neck the over-runs down by using the method I described, you won't have a big over-run, and therefore it won't be causing the one after, and so on.
The part I was trying to avoid having to explain in my Original Post is the following:
If you change the setting in the middle of the smoke without doing a similar thing you will start the over-runs again.
Once you have it settled down, at lets say 230°, and you want to got to 240°, you should set it for 235°. Then when it shuts off at 235° and coasts to lets say 238°, then you reset at 237°, and work your way up to 240° with those small moves. This is what keeps the over-runs small, instead of the up & down swings getting out of hand.
It's really hard to explain, but if you understand what I'm explaining, and your Smoker doesn't have some other problem, this should tune down those wild swings.
BTW: Mine shuts off at exactly on the set Temp, and starts up either one or two degrees below the set temp. All other smoker heat movement is Over-run (Up or Down).