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Standardized Connections: Standard 1/2 inch NPT female threads provide easy integration with existing copper or PEX piping manifolds
delivering a
Simplified Troubleshooting: Features clear diagnostic paths for testing multi-stage electric heating circuits and verify proper relay engagement
Durable Thermal Element: The 1/4" x 4" remote bulb is built to withstand temperatures up to 241°F without losing calibration
though using it with its intended multi-stage equipment is recommended to utilize its full efficiency capabilities
Aprilaire 4977 Relay 322838-752 Standardized Connections: Standard 1/2 inchThe 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