Video: Aprilaire 4079 Feed Tube Assembly

Aprilaire 4079 Feed Tube Assembly Product Information and Installation
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Video Home » Aprilaire 4079 Feed Tube Assembly

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Length: 4:25

I’m Jay, and this is the Aprilaire 4079 feed tube kit. The feed tube is located on either the bottom or the side of the humidifier, and is connected to the solenoid valve. The purpose of the feed tube is to supply water to the distribution tray. Included within the kit are the feed tube, strainer screen, connection fittings, nozzle, and preinstalled orifice.

Over the course of time, chemicals within the water, and heat from your furnace damage the plastic, causing hairline cracks and potentially a water leak. Therefore, the feed tube should be replaced every five to eight years, sooner if the tube is cracked or leaking. This item is also available as part of the maintenance kit for your model.

Replacement is easy. Here’s how.
Be sure to turn the power off before performing any maintenance.
Before performing this service, it is necessary to shut off the water. Find the saddle valve, turn it clockwise until it stops.

Slide the brass nut onto the feed tube. Be sure to put it on the end containing the orifice. Now we’re going to slide on the furl. You’ll notice the furl has a pointy end and a dull end, the pointy end goes towards the orifice. The feed tube material is rather stiff. On some models, it may be necessary to warm it up with a hair dryer in order to bend it. Be careful not to overheat it.

Now let’s connect the feed tube assembly to the solenoid valve. Insert the orifice end into the solenoid valve. Slide the furl and the nut forward. Hand tighten it. Now get out the wrench and snug it up. And the assembly is complete.

Now let’s insert the feed tube into the nozzle. Simply push it in. It’s friction fit; no glue is required.

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