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Aprileaire 500m - Help with wiring to furnace board

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  • Nov 3rd, 2020 12:28 pm
[OP]
Member
Mar 11, 2011
317 posts
126 upvotes
GTA

Aprileaire 500m - Help with wiring to furnace board

Hello,
I've installed a Aprileaire 500m humidifier.
I need help connecting the wiring to the furnace board for 24v power plus control based on Heat.

I want the humidifier to only power on (Selenoid) only when the heat is running. I have my Fan to run 24/7 and rather not have the humidifier run based on my Fan setting.

Can someone help confirm the below picture? Do I wire to "W" and "C"? Will this supply the 24v power so I don't have to use the power transformer?

Furnace is a Keeprite.

Thanks!
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  • PXL_20201102_000931072.jpg
1 reply
Deal Addict
Jun 16, 2009
3710 posts
2203 upvotes
Woodbridge
Unless you want to tap in the contacts for humidifier on board ( 110 V on Keeprite and 24 V on some furnaces ), next option is to connect the wires from solenoid to W and C. Your hand drawn pic is perfect.
h3nry8888 wrote: Hello,
I've installed a Aprileaire 500m humidifier.
I need help connecting the wiring to the furnace board for 24v power plus control based on Heat.

I want the humidifier to only power on (Selenoid) only when the heat is running. I have my Fan to run 24/7 and rather not have the humidifier run based on my Fan setting.

Can someone help confirm the below picture? Do I wire to "W" and "C"? Will this supply the 24v power so I don't have to use the power transformer?

Furnace is a Keeprite.

Thanks!
HVAC Pro-Committed to customer, not brand. Past RFD Reviews
2022 Central Air Conditioner & Furnace Group Buy

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