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self-acting flow control in industrial cooling and heating systems
Variable Speed Efficiency: Maintains constant torque to improve humidity control and reduce energy consumption
This relay is widely used across Johnson Controls manufactured platforms
which monitor flow through the heat exchanger
This model includes a PG9 pilot adapter and a Tinnerman clip
Aprilaire 4977 Relay 320734-701 self-acting flow control in industrialThe 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