Aprilaire 4977 Relay 322838-752 engineered to interrupt the electrical

engineered to interrupt the electrical circuit and terminate the heating cycle when internal plenum temperatures reach the 155°F open setpoint

Standardized Connections: Standard 1/2 inch NPT female threads provide easy integration with existing copper or PEX piping manifolds

though using it with its intended multi-stage equipment is recommended to utilize its full efficiency capabilities

Simplified Troubleshooting: Features clear diagnostic paths for testing multi-stage electric heating circuits and verify proper relay engagement

delivering a

Aprilaire 4977 Relay 322838-752 engineered to interrupt the electricalThe 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