Humidifiers and Dehumidifiers - Wiring Aprilaire 500 with C9MPD Furnace

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mosturl
11-17-08, 07:10 PM
I have a C9MPD100J14C Furnace labled as a Comfort Maker module with an Aprilaire 500 Humidifier. According to the Aprilaire diagram I'm to go from the 24VAC Furncace Accessory terminal or transformer through the Humidistat to one of the solenoid wires. Then from the other selenoid wire to the C on the furnace and back to the other lead on the transformer? My question is how does this work if I have a 24VAC HUM and a 115VAC HUM on my furnace? Can I use these, one of these, have to use the transformer? Any help is greatly appreciated.

Jay11J
11-17-08, 09:43 PM
My question is how does this work if I have a 24VAC HUM and a 115VAC HUM on my furnace? Can I use these, one of these, have to use the transformer? Any help is greatly appreciated.

Use the 24VAC, and the use C.

If you wire it up to the 120VAC, then you need to use the transformer....

So, stick with the 24 volts.
mosturl
11-18-08, 06:44 PM
Just to confirm....24 VAC Hum to the humistat, then to the solenoid, out from the selenoid other lead to the c on the furnace.

Jay11J
11-18-08, 07:30 PM
That is correct..

If you have any other questions, feel free to ask them.