Johnson Controls WEL11A-601R Well 30067439-890 Thermal Expansion Bypass: Integrated bypass

Thermal Expansion Bypass: Integrated bypass feature prevents excessive pressure buildup caused by thermal expansion in closed systems

technicians can maintain UL Listed safety standards and ensure long-term reliability in demanding industrial environments

Ensure the 62-21609-01 matches your specific model number to maintain proper pilot-to-burner geometry and reliable ignition performance under high-demand conditions

the blower running continuously even after the heat cycle concludes

which protects the compressor by preventing suction pressure from exceeding this threshold

Johnson Controls WEL11A-601R Well 30067439-890 Thermal Expansion Bypass: Integrated bypassThe Johnson Controls WEL11A 601R is a heavy duty copper bulb well designed for demanding fluid immersion applications. Engineered for use with remote bulb temperature controls and the A99 series sensors, this 1 2" NPT well ensures accurate thermal transfer while protecting sensing elements from corrosive or high pressure environments. Featuring a 2 3 8" insertion length and a . 299" inside diameter, it provides a precise fit for standard HVACR probes,