Burn pot fire dance

Good for you b. A lot of people use a smaller diameter pipe with an adapter on their systems. This the case on their venting as well all piping should be the same size from end to end. Now the Harman controller is almost always changing the game making conditions vary so it is a continuously variable system. Burn conditions aren't anywhere close to static.

 

Don't forget the feed rate you control is an up to limit and not a constant.

 

Yes, it’s removable. Taking it off requires removing the whole air inlet assembly which is only 3 bolts, but involves a gasket replacement to put it back on. I will see if I can get a decent pic so you see what it looks like.

 

The stoves have only run in room temp mode this whole season. This is not lazy flame, it’s serpents tongue with freaky strobe light special effects applied.

 

Thanks CF, I’m adding some of the things you mentioned here to my list of things to try. The idea about removing the UPS from the picture is interesting. Both stoves are on separate CP1500 UPS units. The UPS itself has a display which shows various stats like voltage and watts used. It does not display by default, but I will turn it on and observe.

I will also throw the magnehelic on the P68 for an extended duration and observe that for fluctuations as well. The caveat being I can only draft test when the stove is not ignited so I won’t be able to line up draft fluctuations with flame behaviors, but still I would not expect to see significant draft fluctuations to begin with (based on what so saw during prior draft tests) so if I DO see something that will be something to note.

You are right, I do vacuum out the hopper and fines box (OCD style) during a major cleaning, which was done last weekend.

 

Thanks Sub. My first comb fan in the P68 died quickly as well (it was not a long drawn out failure). I will never forget that dead motor smell, it was awful and filled the whole house. I did not know that was the only way they go, but now that I do it can be ruled out too. This is a good reminder - I’m going to order a spare (and the paddle) to have on hand so next time one does go, it can be replaced quickly.

 

Wondering if there's a harmonic resonance happening at certain points of operation, I could be way off base
Come to think of it, I'm sure I've seen it on my Accentra
Combustion bearing failure can cause fluctuations in rpm's but how noticeable can it be besides the noise

 

the correct way to test draft is on a cold stove, but you can also test draft on a running stove.....simply get a small tee and plumb it into the flexible silicone line going into your vac switch....newer stoves already have the tee and a little cap on it already.

 

The correct way to test the draft is by the manual for your stove a lot of mag readings were/are taken on stoves that are up to operating temperature on high heat. But the manual for your stove rules.

 

and since this stove, as well as this discussion, is about a Harman, and the Harman manual states to take the draft on a cold stove, all is well........BUT, if one wants to see if there is a draft reading fluctuation while the stove burns, it would have to be done on a hot stove. Older Harmans had a draft port in various locations, but since the stove might be hot, and the connection not so great, a draft reading can be taken at the switch while it runs. In actuality, the reading at the switch is the one that really matters, since the switch will kill your draft if the vacuum in inadequate...this way, you can read the draft that the switch senses rather than the draft in the firebox.

 

Wild, I am not familiar enough with your stove to tell you how to do that, so I have to refrain from answering that...I'm sure someone else here can though!