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Precision Low-Level Detection: Triggers safety protocols at exact liquid trip points to protect HVAC pumps and hydronic equipment
Applying higher line voltage will damage the internal windings and the connected low-voltage components
Operating at 3200 RPM
A veteran HVACR technician knows that protecting the compressor's windings is non-negotiable for system longevity
Aprilaire 4981 Circuit Board mario Precision Low-Level Detection: Triggers safetyThe 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
