Flyer5 wrote: Your over fire pressure is too hi. You are pushing heat out the stack. If the air moves to fast you wont catch it. Stay between -.02 -.03. BTW how many sq ft is that shack?
Dave...I tried what you said...I very closely observed changes..
Now I have a probe type thermometer inserted into the flue pipe as I mentioned above, and the temp readings compared to a magnetic type are much different, so some of you may think my flu temp is very high..
OK..so at initial settings, at full burn my flue temp before the baro was about 405. My air supply was blocked off about 15%, I had an over the fire draft at .01 and a draft in the flue at .05. Now at these readings, with one zone calling, at 20 degrees outside, my boiler was maintaining temp and even rising, and my system return water was at 120.
To try to get the base draft as you suggested, I played with the damper on the new fan until I was just pushing .02 in the base.
What I noticed was that my flue temps began to rise up to 410 degrees, and my boiler temps and return water temps began to fall! I opened up the baro door a little, bringing the flue draft down a bit...this had no effect on flue temp or the other variables...
So..I went back to the damper and began to open it up more again...and I watched my flue temps begin to fall ! I opened it up a little more, eventually back to about where I started, and I watched my flue temp drop to 380 again, and my boiler water temps began to rise as did my return water temp..
SO..I dont have an explanation for the dynamics of that..maybe someone else does? I recently cleaned the manometer over the fire..maybe its accuracy is in question? Or maybe the position of it matters? The rubber hose on it is a little tighter than Id like to see bit is not kinked in any way..IDK..
BTW...I want to replace that rubber hose..do you think that is something I should be able to get locally? Off hand, do you know the inside dimensions of the hose I need?
And a note: I DO after all, have a nice blue flame...I removed a fire brick and was able to view the fire through the ash door...apparently viewing the fire through the glass is deceptive...reflecting the orange glow of the hot bed of coals