Aprilaire 6404 Control 321042-401 The most common issues are

The most common issues are silica buildup from nearby laundry chemicals

For technicians servicing Utica gas boilers or Dunkirk equipment

Built-in USB port configuration facilitates rapid cloning of settings between units

Featuring 1 3/8" x 1 5/8" SWT (sweat) connections

the AAEB series compensates for pressure drops across the evaporator

Aprilaire 6404 Control 321042-401 The most common issues areThe 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