Stove Rumbling

[aweya]

Newbie pellet stove owner here and was wondering if anyone could help.

I just purchased and installed a Harman Advance pellet stove. Overall, I'm petty happy with the stove but I'm getting a low rumble out of it. When I installed the pellet pipe I used a 4" reducer cleanout tee at the stove exhaust and then 4" pipe straight up through the roof with the exception of two 45's and a six inch section to locate the pipe in the center of the ceiling joists. The pipe extends past the roof line about 20". Overall pipe length is approx. 10'. I didnt adjust the draft setting as of yet because I need to find a draft meter for this. Could this be the problem?

Any help would be appreciated.

 

[Jabberwocky]

My stove is different but I might have this same effect. Does the rumble only occur when she's making maximum heat?

I get a very low, deep rumble when the stove goes into high and it is dropping maximum pellets. The technician told me that the amount of wood is so high, the sound is from the air rushing into the stove to combust the wood. He suggested that I could burn the lower grade pellets which would produce more ash but would contain less wood fibre per pellet thereby decreasing the requisite amount of air intake.

I had already bought 3 tons of New England Wood pellets (Canadian version in the green lettered bag) and I had a hunch switching away from the shorter Energex pellets might help. Also, this season, I switched my electronic controls to hardwood as opposed to softwood. The sound is now only rare and it lasts just a second or two. I still have the flame adjust control in my arsenal of weapons.

I'm waiting to see what happens when we go below zero but right now even at 25 degrees outside my stove barely goes to medium to heat my 1600 sf to 75 degrees (73 in adjoining rooms, 71 upstairs).

 

[aweya]

Thank you for replying jabberwocky!

No, it rumbles all the time. I use the same New England Wood Pellet as you. I have the service guy coming to the house tomorrow to check it out. I just installed it myself this past weekend so the people I bought it from offered to come take a look at it for free. Cant beat that eh? I let you know what I find out.

Thanks again!

 

[stoveguy2esw]

if you have a way to slow down the intake air just a bit the rumble should subside, ive seen ours do that when hooked to a chimney , usually on the high end and ive actuallly covered a small amount of the intake pipe with a piece of silver tape , this usually works , you have to play with it a bit to get the tape in the "sweet spot" cover too much and the stove burns dirty, not enough and the rumble stays there. the noise is actually produced by a pressure varience in the stove , the flue is pulling and the blower is pushing in the same direction, similar to "cavitation" in an oceangoing vessel. sounds like a train in the distance usually the fire will have an unusual "quiver" to it when this happens as well. if the tech doesnt make it go away , try that piece of tape on the intake and see if it doesnt cure it.

 

[GVA]

Thank you for replying jabberwocky!

No, it rumbles all the time. I use the same New England Wood Pellet as you. I have the service guy coming to the house tomorrow to check it out. I just installed it myself this past weekend so the people I bought it from offered to come take a look at it for free. Cant beat that eh? I let you know what I find out.

Thanks again!

I'm sure they will just hook up the draft meter and adjust the comb blower speed for ya... Let us know how it works out

 

[aweya]

Ok, the service guy just left the house and Pyro hit it right on the head. I apparently have too much draft and restricting the air intake solved the problem. Smooth as silk right now. I really appreciate you guys showing an interest in my problem. Although I'm new at this pellet stove adventure, as I get educated I will pay it forward.

Thank you again!

Happy burning!