Vermont Castings Merrimack

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dh07830

New Member
Dec 5, 2014
2
NJ
Hello,

I am hoping someone has had the same experience as me and might be able to help me. I am at a loss as to why my Vermont Castings Merrimack insert is not functioning properly. Although it has been evaluated by multiple professionals--all of whom certify that there is nothing wrong with the installation--it just does not seem to be functioning properly.

Some of the problems I'm encountering are:
1) the stove can only run when the primary air control is on the lowest setting, otherwise the stainless steel chimney liner glows red.
2) the stove does not seem to be putting out the right amount of heat--you can stand right in front of it, and the air is warm, but definitely not HOT, as it should be. It also doesn't seem to be blowing the right volume of air. The fan has been checked and appears to be functioning normally, but it seems like the amount of air being pushed out of the stove by the fan is less than expected (which perhaps explains why you can stand right in front of it). (Just for reference, today it was 36 degrees, and the stove only heated the house to 72. We have an open floor plan AND the thermostat is 10 feet from the stove.)
3) the stove seems to be burning wood at a higher-than-normal rate even though it is putting out little heat. Even on the lowest setting, the wood needs to be re-stocked every 5 hours. After 6 hours or so there are still glowing embers, but again, not much heat output. The specs of the stove indicate a burn time of up to 12hrs.

There was an issue with the automatic setback air control not closing automatically, but even once this was fixed, the same problems persist.

Please help if you have seen any of these problems before or just have any ideas!
 
Looks like you got a leak somewhere. Did you check your door gasket "dollar bill test"?
 
I did the dollar bill test as advised. The first time it failed, and there was little to no resistance. I tightened the latch and it then offered a bit more resistance, but I could still pull the dollar out. The stove only has 2 months of use, but I will replace the gasket just in case. The liner still turned somewhat red after the change, but not as bad as before.
 
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I have the same insert. My home is ~2000SF and relatively open. I've had stand alone stoves before and didn't know what to expect. The burn time is similar to what the OP said and I expected a few hours longer. Overall I've been somewhat dissappointed.
 
I have the same insert. My home is ~2000SF and relatively open. I've had stand alone stoves before and didn't know what to expect. The burn time is similar to what the OP said and I expected a few hours longer. Overall I've been somewhat dissappointed.

Dave,
Do you/did you experience the "runaway" flue temps like the OP.
its really a concern to peek behind the coverings and see a cheery red glowing insulated flu.
 
After checking the moisture content of my wood and making sure I really fully load up my box with wood, I am getting much longer burn times. When loaded properly with the best dry wood I have, I've observed 11+ hours. Still enough red hot coals to add some very small pieces of wood with a few pieces of paper and you're back in business.
 
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