Question about Aprilaire 550 Humidifier

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Aprilaire 560 not keeping contant power to cause humid. to work

I have now replaced ALL the parts on the humidifer (wiring, hum, solenoid, humidistat, current sensing relay). It still does not work properly. When the furnace comes on, the humidifer does not come on. I can wait until the blower comes on, turn the humidistat down and back up, it clicks and then stays on until the blower turns off. So all parts work properly, but the system does not turn on by itself without my turning it down and back up to get the click. It almost seems like the sensing relay sould be atached differently. I am at my end of my ability (not much there to begin with on electical parts). I hope someone else has had a similar issue. We are really dry in our house.

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  • Jim in Akron Feb 04, 2009

    The humidistat is set in the return airduct a couple of feet above (up stream, if you will) from the place where the humidifier enters the return airducting. It is the same place originally set in the house from the builders, but the problem only started occuring in the last two months. I did read where you should not have that attached to the return air ducting, but I am open to your suggestions as to why. I just assumed that it was ok and a problem with the units parts, which were all since replaced.



    As for the current sensing relay, it is attached to a "white" wire coming off the fan/blower. Again, it is the same place it was set up before, which is why this is so difficult for me to understand. If there is a different wire I should be hooked to, please let me know.



    I hope you can help.

  • Chris Parrish May 11, 2010

    how and where is the humidistat located? where do you have the current sensing relay hooked to?

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You may be havig problemm w/ the current sensing relay, try bupassing the current relay and see if the hum. comes on and if it comes on the try rapping the wite wire from the main blower 2 times. hope that helps

Posted on Feb 09, 2009

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