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HVAC help - electric furnace

Discussion in 'Off Topic [BG]' started by Armueller2001, Jan 19, 2014.

  1. Armueller2001


    Sep 19, 2006
    Dallas, TX
    Hey guys

    I'm in an apartment with a small electric furnace in the closet and there is a little fan (not the main blower) that is running all the time, even when the furnace is off. It is attached to a flex duct that looks like it goes outside.

    Can anyone tell me what it is? Is there a way to turn it off? Seems like a waste of energy to have it running at all times.

    Thanks! :hyper:


    Attached Files:

  2. Clouz

    Clouz The Ayatollah of Jack and Cola

    Jan 26, 2013
    my best guess is that a relay needs replaced. you're going to have to get a tech in there to figure it out. very hard to diagnose just by a picture. it could be a limiter also which controls when the fan kicks on and off according to temperature. should be a 5 minute fix. call a tech and write down all the numbers on the honeywell box and he might be able to help you. the one thing you can check is your thermostat and see if the fan switch is switched to "on" instead of "auto" where it should be. hope this helps. Kevin
  3. Armueller2001


    Sep 19, 2006
    Dallas, TX
    Thanks for the reply. I checked the thermostat and the fan was set to auto. When I switch it to on, the big blower fan comes on. Not sure what this little auxiliary fan is off to the side...
  4. Clouz

    Clouz The Ayatollah of Jack and Cola

    Jan 26, 2013
    i would say that fan was put there to force extra air into a space where the main fan was not able to. i used these on some a/c systems to help with trouble spots. it is controlled by either temperature or by when the main fan kicks on. has to be a control. call a tech.
  5. I don't see where that contraption is connected to the furnace at all, except perhaps to the electronics. It looks to me like it's there to vent the room that the furnace is in. Not that it makes sense for en electric furnace, just saying that's what it looks like.
  6. On gas furnaces the smaller fan is a draft inducer fan; it keeps the CO2 moving out of the house/apartment unit and must operate for the furnace to work or it will not fire up at all. If there are any other gas appliances (hot water heater?) this may be the case. I don't know if this is relevant to your situation. Your apartment must have maintenance personnel; I would call your manager or whomever you pay and report it. Whatever you do, don't disable the fan yourself; CO2 is deadly!
  7. Indiana Mike

    Indiana Mike

    Nov 18, 2005
    I bet it's for radon removal

    If it's not directly connected to the furnace it's probably for radon removal.

    Look it up
  8. Indiana Mike

    Indiana Mike

    Nov 18, 2005
    If it's not for radon then it's probably for fresh air changes to prevent indoor pollution
  9. BawanaRik


    Mar 6, 2012
    New Jersey
    I was thinking this. CO2 can be deadly.
  10. Indiana Mike

    Indiana Mike

    Nov 18, 2005

    Look at the lowest box in the photo

    It looks like a time clock to me

    It might control the small fan you speak of

    This would be a way to turn it off permanently
  11. Indiana Mike

    Indiana Mike

    Nov 18, 2005

    It is some for some type of ventilation

    Was probably required by code when the building was built or renovated

    Hvac is my trade


    The picture is vague.

    The fan probably does not draw more than a lightbulb.

    If it's an apartment call maintenance and ask them what it is .

    Then decide what to do.

    It might be assisting in maintaining a healthy indoor environment .
  12. Indiana Mike

    Indiana Mike

    Nov 18, 2005
    CO2 is carbon dioxide

    CO is carbon monoxide

    If you don't have any fossil fuel appliances the chance of CO being present at a harmful level is about zero

    For CO2 to be present you've got me.
    Maybe if you opened a lot of beers at the same time. Or sodas. Or brought in a giant chuck of dry ice.
  13. My bad!!! :smug:

    Good thing I'm a bass player :bassist: -

    I leave the science to my wife (a lab tech).

    Actually I am now also a maintenance tech...listen to the HVAC guy!

  14. BawanaRik


    Mar 6, 2012
    New Jersey
    Sorry. I added the 2 by accident.

    There's plenty of CO2 in the air as it is.
  15. Gaolee

    Gaolee Outta my way! I'm caffeinated! Supporting Member

    It is probably the whole house exhaust. That's a current code requirement. When was the building built?
  16. Indiana Mike

    Indiana Mike

    Nov 18, 2005

    Your correct

    I was tailing about a dangerous level

    Ha ha
  17. tangentmusic

    tangentmusic A figment of our exaggeration

    Aug 17, 2007
    It's basically an induced draft motor.
    It will prevent CO from being forced into the living space by venting it outside.