Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Little to no draft

Options
I installed a new low boy oil furnace in the summer of '03. On the day I installed it the outside temp was 85 degrees and humid. When I set up the furnace I had a .00 to -.01 at breach, I assumed that when the temp outside dropped that the draft would increase do to temp. differential. I had a delayed ignition in Jan'04 on this unit, when I rechecked the burner low draft was still a problem. I cleaned the furnace last month, still no draft. Chimney is very difficult to line, I had the homeowner call a chimney expert and they said the chimney is fine???
Is there any thing I can do besides a draft inducer to improve draft? Any suggestions would be great. Thanks.

Comments

  • Blackoakbob
    Blackoakbob Member Posts: 252
    Options
    re-instate the draft

    look for external reasons for the poor draft...check for high trees or other obstructions outside, a cold outside chimney, like on an outside wall with just one warm wall exposure, start up unit and check the draft and then open an outside window or door preferably in the same room to check for lack of combustion air, also, are there attic fans running causing a negative pressure in the house at different times as they usually cycle on the attic temp...
    just a few suggestions. Regards,
  • Mellow_2
    Mellow_2 Member Posts: 204
    Options
    Maybe

    If you have enough air coming in a prepurge control might help. This would get the air moving before you try to light. The problem is, if it delayed it sounds like an adjustment or bad igniter. The Chimney is clean and worked with the old unit I don't think the draft is a problem. Has this been a problem before? The new units are differant than the old ones and we should control them differantly. The new ones also like low draft sometime depends on the unit. Sorry about the spellingr.
  • Ed_13
    Ed_13 Member Posts: 164
    Options
    Chimney draft

    Mark,

    Does the chimney have a liner at all?

    Is anything else connected into that chimney?

    Is the new unit much smaller than the one it replaced?

    Need more info to consider problem.

    Regards

    Ed Carey
  • Ed_13
    Ed_13 Member Posts: 164
    Options
    Chimney draft

    Mark,

    Does the chimney have a liner at all, (clay, ss)?

    Is anything else connected into that chimney?

    Is the new unit much smaller than the one it replaced?

    Need more info to consider problem.

    Regards

    Ed Carey
  • Ken D.
    Ken D. Member Posts: 836
    Options
    Chimney

    Do you have enough combustion and return air? Any exhaust fans on? No blockages? Does new furnace have the same firing rate? Any other appliances connected to same chimney?If the new furnace has a much lower stack temperature, then that is your problem. If chimney can't be lined, how about a direct venter? Trees and buildings as well as roofline can affect draft.
This discussion has been closed.