Aprilaire 4977 Relay 321894-706 reducing compressor load and improving

reducing compressor load and improving system stability

Reliable Cold Starts: High-amperage output ensures proper hot surface igniter glow for consistent ignition

This is the recommended direct replacement

Replacing these internal components during scheduled maintenance is far more cost-effective than a total valve swap and significantly reduces potential downtime

Aprilaire 4977 Relay 321894-706 reducing compressor load and improvingThe Aprilaire 4977 Relay is a high performance 24v Coil DPDT Relay designed for seamless integration within advanced HVACR systems. This versatile double pole double throw relay serves as a critical HVAC control component, allowing for the simultaneous management of two independent circuits. Engineered for Aprilaire humidifiers and air cleaners, this 24 volt switching relay ensures precise electrical isolation and reliable secondary hardware