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Aprilaire 500 Install Help

2291 Views 3 Replies 2 Participants Last post by  BaconK5
I am installing an Aprilaire 500A whole house humidifier on my Carrier Weathermaker 8000 forced air unit. I have everything installed and I'm ready to do all the wiring. The model 60 control that I got is different than all the ones ive seen before. Instead of 10 screw terminals, this one has 11 with an additional Gf terminal. I could hook it up the way the instructions show, but it seems considerably more complicated than it needs to be. My furnace happens to have the HUM and COM points which should make this a breeze - can I use these instead of the goofy instructions they provide? What terminals get connected?

As a side question, on my furnace I noticed a second 18/2 line coming in and connecting to the Y and COM terminals but I dont know where it goes. It is not the thermostat wire and I have no other controls - could this be going outside to the A/C unit?
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This is the control board from my unit. Note the extra 18/2 line coming in to the Y and COM


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:) "extra line" is noted....looks like the AC control power to me:thumbsup:
I checked in with Aprilaire and got it straightened out. They changed the way the solenoid terminals work and the default instructions are setup for blower activation. To remove the blower activation I just need to swap a couple of wires.
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