We bought a home with an Aprilaire model 440 and have no idea how it works. Please help!

Thursday, March 7, 2013 by Aprilaire Team

Consumer question:

We bought a home with an Aprilaire model 440 and have no idea how it works. It has a dial with a red line and a white line. On top of the dial it says humidity and on the lower half it says outside temp. Where should the red line be and where should the white line be? Thanks for your help.

 

Aprilaires' response:

Thank you for contacting us regarding the control for your 440. The white line points to the upper numbers, which are the percentage of humidity settings, and the red line points to the lower numbers, which are the outside temperatures. To set this style of humidistat, check early in the day what the anticipated low temperature will be for the night and line up the red line with that temperature. The white line will then be pointing to the correct percentage of humidity. We hope this information is helpful to you.

If you have any further questions regarding this or any of our products, please feel free to contact our customer service department at your earliest convenience.

Aprilaire - Division of Research Products Corporation
1-800-334-6011
Visit www.aprilaire.com
Call center hours are M-F 7am-5pm CST

 

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