meaning it triggers the fan at 110°F and continues operation until the temperature drops 25°F below that set point

outlet range for medium-pressure requirements

contractors can significantly reduce emergency downtime and protect the primary HVAC refrigeration circuit from overpressure conditions

Technicians frequently use this relay alongside a standalone 24V transformer to provide the necessary common wire for modern thermostats on legacy 2-wire setups

the "/U" suffix simply denotes universal retail packaging

Lennox 58J97 Flare Kit R-410A meaning it triggers the fanThe Lennox 58J97 Flare Kit (also cataloged as 58J9701) is a critical TXV Flare Adapter Kit engineered for high pressure refrigerant line connections in residential and light commercial HVAC systems. This genuine OEM Lennox part, also identified by model number LB 86210A, provides the necessary components to transition from standard flare fittings to thermostatic expansion valve (TXV) ports without requiring manual brazing or specialized field