Mark II Location

[chadcj7]

Hello everyone. I had another thread about my Drolet HC. I took the advice of others and added a Field Controls barometric damper. I was adjusting based on the numbers of the damper, but felt it was not running as effectively as it should. With that being the case, I ordered a Dywer Mark II. My plan is to install this permanently and not for a quick test. I have done some research on this site, but not able to find the answer to one of my questions. My plan is to take 1/4 copper tube and create an S shape out of it to stick in the 1/4 hole below the damper. My dilemma and question is, can I mount the Mark II on the wood burner? The closest wall I have is about 5 feet away on all sides. If I can, any recommendations for the Heat Commander?

Thanks

 

[sloeffle]

I screwed mine to the return duct.

 

[Citationls]

Im not sure if temperature changes would effect the reading/zero point. Would be nice to mount it on the front of the plenum. I put mine a few feet away from any heat source just in case.

 

[brenndatomu]

Im not sure if temperature changes would effect the reading/zero point

It does.
I'd just mount it to the wall...it comes with 5-6' or hose anyways.
If you dont want to do that then just get a board and screw it to a floor joist above...mount the Dwyer to that. Dwyer needs to be level and plumb. Calibrate zero after the furnace has been running and the room/area is about the average winter temp.

 

[sloeffle]

Should have been more specific. I mounted mine on the snap disc side of the return duct going into the back of the furnace. It was easily visible when leading the furnace, or when checking on the flue.

It was an older Caddy so the way the duct work is connected is a little different than the newer ones.

 

[chadcj7]

Thanks, everyone. I would mount to the joist on the ceiling, but it would be a pain in the butt as I have 10 ft ceilings. I may just extend a 2x6 from the joist down and attach it there for easier access and visibility

 

[brenndatomu]

I may just extend a 2x6 from the joist down and attach it there for easier access and visibility

👍

 

[chadcj7]

A couple of quick questions. How does this install look? Should I zero it out after I have everything set up and no fire running, or zero before putting the copper wire and tube on?

 

[brenndatomu]

That looks good.
Zero it before hooking it to the chimney, then once it runs for some time and everything in the room is up to "normal" winter temp, pull the tube and check zero again...might be a hair off, might not. I know mine changes a bit.
Once its set, you generally don't have to adjust it again.
It is good to pull the tube out of the stovepipe and clean the soot off it once in a while...kinda gets covered up.

 

[chadcj7]

Thanks. I know this may be a dumb question, but in the Drolet manual, it says to be at -.04 to -.06. Does this mean that I want the red dye to go down and to the left?

 

[brenndatomu]

Thanks. I know this may be a dumb question, but in the Drolet manual, it says to be at -.04 to -.06. Does this mean that I want the red dye to go down and to the left?

Not dumb at all... actually a great question. Normally, yes, to the left for negative pressure like in a chimney, but, if you hook to the right hand port instead, it works just the same, but reads to the right, and will give a much great range, and easier to read in my opinion.

 

[chadcj7]

Glad I asked and thank you for the clarification. Just to make sure I am still reading this right, I am assuming that to be at the numbers above based on Drolet, I need to be between the red lines?

I also zeroed out the Mark2, but it is windy today and it is moving a little

 

[brenndatomu]

Glad I asked and thank you for the clarification. Just to make sure I am still reading this right, I am assuming that to be at the numbers above based on Drolet, I need to be between the red lines?

I also zeroed out the Mark2, but it is windy today and it is moving a little

Yup, you got it!