Wiring question, 24V transformer to furnace


Old 01-06-10, 07:45 PM
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Wiring question, 24V transformer to furnace

I plan on installing my new Aprilaire 700A this weekend. My only question is how I hook up the supplied 24v transformer to the furnace. My furnace is a Lennox G43UF series. I would wire the transformer to the HUM/Neutral or EAC/Neutral but both only come on when heat is called for. This will be supplying constant 24v power to the humidistat(R & C terminals).

Can I wire the transformer to the power that enters through the make up box and screw/thread the transformer right to the make up box?? Black to Black/ White to White and no ground wires to worry about correct?

I plan on wiring the rest of the unit like Diagram #1 (pg1) of this pdf: http://www.alpinehomeair.com/related...20Diagrams.pdf

Thanks for your help.
Old 01-08-10, 07:42 AM
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Join Date: Sep 2001
Location: Rochester, Minnesota
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This is how I wire them.

Wire Transformer to HUM on the board.

Then wire the transformer to W/G and Cf.

Then wire R and C from humidistat to R and C on the furnace.

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