Video: Aprilaire 4403 Humidifier Pad Frame Scale Control Insert

Aprilaire 4403 Humidifier Pad Frame Scale Control Insert Product Information and Installation Assembly
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Video Home » Aprilaire 4403 Humidifier Pad Frame Scale Control Insert

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Length: 2:11

I’m Jay, and this is the Aprilaire 4403 scale control insert, commonly called a filter or pad frame. It is located on the inside of the humidifier, and surrounds the water panel. The purpose of the frame is to act like a reservoir, holding water, which then wicks up the water panel. It also prevents mineral build-up inside the humidifier cabinet, and acts as an emergency drain should the unit overflow. The distribution tray, floats, and float cover are available separately. The pad frame should be replaced every five to eight years – sooner if the frame is cracked or damaged. 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.

There’s no top or bottom to the water panel. Simply slide it into the scale control insert, like this. Here’s the distribution tray, this side here with a little loop must be on the same side as the floats. Snap this into position. Now we’re going to take the float cover, install the floats in it, snap it into position. There are two snaps, one on each side. They must be engaged. Again, there’s a little loop here that must face the same side as the floats. This side will now go towards the inside of the humidifier, this side will go towards the furnace or ductwork. The assembly is now ready to be installed inside of your Aprilaire humidifier.

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