I recently had a complete new system installed; Carrier heat pump and variable speed oil furnace 58VMR. I notice oil furnace exhaust fumes in the basement when the oil furnace runs.
Because it is a duel fuel system, the oil furnace does not run that much until the outside temp gets to about 30* or below.
I called the company that "hooked-up" the oil furnace (the install company does not do oil) and the fellow found a negative one draft from the chimney. He is puzzled by this situation. When the oil furnace runs for a few minutes the draft is positive as it should be.
The oil guy said to "just run the oil furnace only".
It seems to me that it would be "natural" to have a negative draft in a "cold" chimney. Am I correct ??
If that IS the case how do I prevent "exhaust fumes" in the basement ?? Any suggestions ??
BTW, I just had a contractor (other than the ones associated with the install) seal the duct work as best he could.