Aprilaire 4977 Relay 321894-706 It is highly recommended to

It is highly recommended to cut out the old drier with a tubing cutter

The Robertshaw 1980-018 utilizes a high-grade copper and nickel alloy core for maximum millivolt output and electrical conductivity

Industrial-Grade Durability: Built to withstand high-temperature environments inside heat exchangers and burner boxes

This is the recommended direct replacement

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

Aprilaire 4977 Relay 321894-706 It is highly recommended toThe 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