franco b wrote:It should read higher at the flue exit than over the fire. Be sure to zero the unit before hooking up.
Basically you want air sucking into that little hole in the fire door, it should pull a match flame in with the unit running. The manometer tells you how much that pull is. Too much and heat is exiting too fast and too little there might be danger of fumes escaping.
The purpose of the barometric damper is to keep that pull constant even though the chimney draft changes with temperature and barometric pressure. Without it the fire will vary with those changes.
I see now how it would show the pressure differences. Thanks...
I did set it at zero before firing it up. I'm in between the arrows now with the unit running on low like in the picture above and hooked up reversed.
I'll take a reading in the front hole tomorrow to compare.. I'm looking forward to tomorrow morning to see what temps I'll be at in our living room upstairs and compare to the stove temp markings.
Harman says to adjust the blower flap to achieve the firebox specs. I'll take my readings at the stove flue and then the fire box front and compare then adjust the blower flap to spec's.