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Thread: IFC

  1. #1
    Join Date
    Dec 2004
    Location
    Michigan
    Posts
    143

    IFC

    First, I did do a search and did not find what I was looking. Perhaps wrong wording in the search bared no fruit. Thus, if this has been answered before, I apologize.

    I am looking for the "general theory" behind the "HUM" and "EAC" tabs on any given Integrated Furnace Controller (IFC) board.

    As I assume.....
    The HUM tab is energized only when Heating Motor speed Tab is energized.
    The EAC tab is energized when either the Heating or Cooling Motor speed Tabs is energized.

    Would my understanding be correct...???
    Any further explanation or comments are welcome.

    Thanks,

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,586
    That's it. Though some turn the hum on with the fire so the pad is getting wet when the blower comes on.

    Sent from my HTC VLE_U using Tapatalk 2

  3. #3
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    I'm thinking they pass 120v, not 24v.
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  4. #4
    Join Date
    Dec 2004
    Location
    Michigan
    Posts
    143
    THANK YOU....

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,586
    Carrier hum terminals are 24v, most are 120v. Rheem's 1st generation Mod had dry contacts but I think the current one is 120V.

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