Designed as a critical OEM replacement part

The RIBU2C is housed in a NEMA 1 enclosure intended for indoor use

Automatic Reset: Self-correcting design restores system power without requiring a manual service call

remote bulb control operates within a precise range of -20°F to 50°F

Power Efficiency: Advanced brushless DC motor technology minimizes transformer sizing requirements (3 VA)

Lennox 59W21 TXV Freon Designed as a critical OEMThe Lennox 59W21 Thermal Expansion Valve (TXV) is a critical 8 ton metering device engineered for precision refrigerant control in high capacity commercial HVAC systems. Designed with 3 8" x 1 2" ODF sweat connections, this valve ensures accurate superheat maintenance across varying load conditions, preventing liquid floodback and protecting the compressor. The 59W21 features a 30 inch capillary tube and is officially rated as the direct replacement