Aprilaire 63 Modulating Control 318973-401 Direct OEM Fit: Drop-in replacement

Direct OEM Fit: Drop-in replacement for the 624625

This valve assembly is frequently utilized in fan coil units and small reheats where tight shut-off and high rangeability are required to maintain system efficiency and stabilize discharge temperatures

Always verify the 5VDC input reference at the plug before condemning the part

Common indicators include inconsistent temperatures between rooms

The NAT 16" BURNER ASSY #30 ORF is constructed from heavy-gauge aluminized steel to resist thermal stress and corrosion in high-cycle environments

Aprilaire 63 Modulating Control 318973-401 Direct OEM Fit: Drop-in replacementThe Aprilaire 63 Modulating Control is an advanced automatic digital modulating control package specifically engineered for the Aprilaire 801 steam humidifier. This precision kit uses a microcomputer based design to deliver responsive humidity control, ensuring the indoor environment maintains an ideal moisture balance. By providing a 010Vdc or 210Vdc modulating output, the system adjusts the humidifier's intensity proportionally as the space