allowing you to combine values using the included jumper wires

as the control logic is based on valve positioning and pressure/temperature sensor inputs processed through the main system controller

this unit integrates seamlessly with RDM and ZDM dampers to manage bypass air without the need for complex field calibration

Its robust silver cadmium oxide contacts are designed to minimize arcing and resist welding

Aprilaire 6404 Control 319852-301 allowing you to combine valuesThe Aprilaire 6404 Control is a professional grade 4 zone control panel designed to provide precise HVAC zoning solutions for both residential and commercial applications. This universal multistage zone controller is compatible with single stage heat cool, multi stage conventional (up to 2H 2C), and heat pump systems (up to 4H 2C). Featuring an LCD display for setup and LED status indicators for real time diagnostics, the Aprilaire 6404 simplifies the