Question about Aprilaire 700 Humidifier

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Runs without the furnace blower blowing

Not sure if this is normal? Every other humidifier I have had only ran when the furnace blower was powered. Any confirmation of a problem? Thanks.

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  • sp88 Jan 16, 2009

    Yah, all the time.
    I agree, another HVAC guy I spoke with in passing said same thing. I found where the wire is tied in but have no idea where to switch it to. Box is labled RWGYB/O. Time to call a tech.

    Thanks.

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Sounds like wired incorrectly. always do this? not wired into blower circuit correctly

Posted on Jan 15, 2009

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Yes - but it doesn't have to work that way. There are several methods you can use to have the humidifier run only when the furnace runs. Look on the back page of the installation instructions. The method I chose was to install a sail switch. This is a switch with a arm attached which has a "sail' attached to it. When the furnace blower runs, the sail catches the blower airflow and activates the switch; allowing the humidifier to operate.
You can also wire in a current sensing relay (figure 6 on the instructions) or connect the humidifier directly into the furnace motor ignition box (if so equipped. My furnace dates to the late 70's and has no place to plug in a humidifier; which is why I installed a sail switch.)
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1 Answer

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1 Answer

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Also anytime you work on a furnace you can kick up some dust. Always clean the flame sensor.
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