On an upflow furnace without a/c (heat only) what is the preferred location of the main components of an Aprilaire 500 series?

Consumer question:

On an upflow furnace without a/c (heat only) what is the preferred location of the main components of an Aprilaire 500 series? Should the main unit be mounted on the output(hot)side and the bypass on the return plenum with the controls above the bypass on the return? Thank you in advance

Aprilaires’ response:

Thanks for contacting us about you Aprilaire humidifier.
The mounting of the main unit depends on the space available. Preferably the main unit would be mounted on the return duct before the air filter. The bypass duct connection should be connected to the supply plenum, about 12 inches away from the furnace. Mounting of the humidistat should be at least 6 inches upstream of the connection to the return duct.
Thank you for allowing us to assist you.

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