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November 18th, 2019, 6:01 pm
#1
* Abilene ** Abilene *
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The Yoder 640S seems to make more smoke at lower temperature settings (e.g. 180F setting).

Knowing that the combustion air fan is constant speed/volume, how does the smoker produce more smoke at a lower set point? One could imagine that with a variable speed fan you could produce a smoldering pellet pile but the fan is producing the same amount of air that you'd get at a 500F setting.

The temperature set point is achieved with pellet flow (auger speed). The air flow is constant and not variable from one setting to the next.

November 23rd, 2019, 9:55 am
#2
* Abilene ** Abilene *
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Hoping that @Yoder_Herb might respond to this.

BTW, I have a YS640s and should have put this post in the ACS Pellet topic area.

November 23rd, 2019, 10:46 am
#3
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I am not sure what you are asking. The design and programming of the controller, coupled with the calculated air flow, pellet feed rates and the very large burn grate, allows the perfect fire to produce a transparent blue smoke throughout the entire temperature range of the cooker. This is assuming the use of the factory preferred pellet brand, BBQRs Delight.

Yoder_Herb
November 25th, 2019, 9:02 pm
#4
* Abilene ** Abilene *
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Thanks Yoder_Herb for your reply.

Perhaps asking a more direct question will help me and my son. We both bought YS640s grills quite recently and my post/question was driven by our observations.

Does the controller vary the combustion air flow? From our observations we are assuming that the combustion air fan is constant flow and not varied by the controller regardless of pellet feed rate.

November 25th, 2019, 9:45 pm
#5
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Alphonse wrote:Thanks Yoder_Herb for your reply.

Perhaps asking a more direct question will help me and my son. We both bought YS640s grills quite recently and my post/question was driven by our observations.

Does the controller vary the combustion air flow? From our observations we are assuming that the combustion air fan is constant flow and not varied by the controller regardless of pellet feed rate.


The fans run at a constant speed at all times, so no, the controller does not vary the airflow.

Yoder_Herb
November 26th, 2019, 9:39 pm
#6
* Abilene ** Abilene *
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Thanks Yoder_Herb for the prompt response.

Now my son and I will have to try to figure out why we think we are observing more smoke at lower temperature settings (<200F).

With a fixed air flow rate, the only controlling variable is pellet feed rate.

Therefore one could can imagine that with a low temperature set point (and its corresponding low pellet feed rate) there is more excess air as compared to higher temperature settings. So wouldn't it actually produce less smoke at lower temperatures than higher temperatures (which seems to be the opposite of what we're seeing)?

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