Video: Aprilaire 4266 Humidifier Feed Tube Assembly

Aprilaire 4266 Humidifier Feed Tube Assembly Product Information and Installation
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Video Home » Aprilaire 4266 Humidifier Feed Tube Assembly

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Length: 4:27

I’m Jay, and this is the Aprilaire 4266 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, 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.

Grab the end of the feed tube with the orifice in it. Slide the brass nut on first, followed by the nylon furl. Be sure to have the furl with the skinny side pointing towards the end. Now let’s connect it. We start by inserting the feed tube into the solenoid valve, orifice end first. Slide it in; slide the furl forward. You’ll notice the furl, the pointy end is towards the solenoid valve. Slide the nut forward; hand tighten it. It’s important to keep pressure on the feed tube to keep it inserted into the solenoid valve, otherwise it may back up. Now we’re going to tighten it up, and we’re done. 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 attach the feed tube to the nozzle. Simply insert it. It’s friction fit; no glue is required.

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