improve operational stability

making it a standard fit for a wide range of ICP-manufactured systems including Heil

Does this control have a manual "Off" setting on the dial

making it ideal for indoor blower assemblies

The "VV" indicates the inclusion of dual access valves

Aprilaire 4981 Circuit Board 323613-751 improve operational stabilityThe Aprilaire 4981 Circuit Board is a critical OEM replacement part engineered specifically for Aprilaire 800 and Aprilaire 865 steam humidifiers manufactured before November 2014. As an internal control circuit board, this component acts as the "brain" of your humidification system, managing the 24V power distribution from the humidifier transformer and regulating the electrode steam canisters operation. If your units green power LED fails to