Video: Aprilaire 4277 Distribution Tray

Aprilaire 4277 Humidifier Distribution Tray Product Information and Installation Assembly
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Length: 2:29

I’m Jay, and this is the Aprilaire 4277 distribution tray. It is located on the inside of the humidifier, installed on top of the pad frame. The purpose of the tray is to act as a reservoir for water, before it is distributed onto the water panel. Within the tray are six holes, along with a fabric liner used to evenly disperse water. This material is necessary for your humidifier to function properly.

Earlier versions of this tray were equipped with a granular coating, rather than a fabric liner. The tray should be replaced every five to eight years – sooner if the fabric liner or granular coating is damaged or missing. 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.

These components are common to most Aprilaire humidifiers. The parts in your model may look slightly different, but the assembly procedure is similar. The plastic components should be washed using mild soap and water prior to replacing the water panel, which must be replaced annually.

On the back of the box, you’ll find clearly printed instructions for all the models. You’ll notice one edge of the water panel has a spray paint mark; that indicates the top. Let’s slide this together. Now, this particular scale control insert has notches cut into it. Those notches line up with the tabs on the distribution tray. The assembly is now complete. You’ll notice this side has a little notch in it. That side must go towards the inside of the humidifier. This side goes towards the furnace or ductwork.

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