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  1. #1
    Join Date
    Oct 2002
    Location
    Lexington, NC
    Posts
    5,159

    Fan relay center

    This is a fan relay center like you see on old Rudd gas furnaces and most oil furnaces. When I was working on my install this morning, I first found the fan would not work. Easy fix, I had the door off and the button was out. I pushed the button in and it still would not turn on. I got my meter out and while I was working I pushed the relay in and the fan came on. I turn the power off and back on, it won't start the fan again, I push in on the relay a little and it comes on. I took the hole front of the fan center off to make sure I didn't have a loose wire. I turned the power off, turned the power back on and the fan would not start. While holding the cover so that I didn't move any of the wires, I pushed the relay in a little and the fan came on. So, I took the relay out, checked the ohms and I think it read around 90 (seemed high, but anyway). I checked for corrosion on the terminals and saw none. I put it back in and it has worked fine since. Of course I did not mess with it anymore except to see how hot it was and it was pretty hot, even though I was in a hot attic, it was hot to the touch. I am wondering if this is normal on these little relays and if I should not worry about it, or if I should go back and change the relay as a preventative measure. I just don't see these things that much in commercial work and I don't know if they are supposed to be hot or not. I am still at a loss why it was acting the way it was. Your help is appreciated guys. Thanks

  2. #2
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Most of the commercial units I see have at least one of those relays.
    Karst means cave. So, I search for caves.

  3. #3
    Join Date
    Sep 2007
    Posts
    16
    I would have changed it out. A relay is a relay, you shouldn't have excessive heat.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,331
    They can vibrate loose.
    That only about a .27 AMP draw at 90 ohms, 24 volts.
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