Frozen Forced Air Furnace?

Discussion in 'HVAC Heating & Cooling' started by molo, Feb 16, 2009.

  1. molo

    molo Member

    Messages:
    848
    Location:
    cold new york
    Hi,

    Can a Forced Air Furnace be damaged by freezing conditions? I'm considering a place where the furnace was exposed to freezing and I am wondering what could be damaged with it.

    Thanks for any replies
    Last edited: Feb 16, 2009
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,262
    Location:
    New England
    Unless it has a humidifer in it, probably not.
  3. PEW

    PEW DIY Senior Member

    Messages:
    487
    If it is high efficiency with condensate discharge, you may need to heat tape the discharge.
  4. Bill Arden

    Bill Arden Computer Programmer

    Messages:
    584
    Location:
    MN, USA
    Or you might have to replace a tray or tube if it's let to freeze with water in the tray or tube. That would be a relatively cheep repair.
  5. PEW

    PEW DIY Senior Member

    Messages:
    487

    Unless the unit is in the attic and the pipe breaks away from the tray...... Been there done that.:(
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,262
    Location:
    New England
    My condensing boiler has a trap in it, so if it held water, you'd probably break it. A conventional furnace would not normally have any water in it by design...not saying if you left it in the rain and then it froze you wouldn't have problems (maybe more from the rain in the controls!), but normally, except for the water vapor from the combustion process that normally goes out the flue, there should not be any water in there, and the controls normally wouldn't have a problem, or they'd never be able to ship them anywhere in the winter...few train cars or tractor trailers are heated.

    Boilers, on the other hand, unless purged (blown dry) would likely have problems, depending on the quantity and where water was in them when it froze.
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