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or high limit switch failure
the 10 5/8" length is specific to Weil McLain technical specifications for their 76 through 94 series
out-of-sensitivity
Durable Construction: High-quality cast iron body and stainless steel internals provide a long service life in HVAC steam applications
Trane VAL12644 Gas Valve 321142-301 or high limit switch failureThe Trane VAL12644 Gas Valve is a genuine OEM two stage gas valve engineered for critical applications in Trane and American Standard rooftop units and furnaces. This 24V gas valve features a 1 2" NPT inlet and outlet, designed specifically for split system and packaged heat pumps or gas electric configurations. As a high performance HVAC replacement part, it provides precise two stage gas control with factory set pressure regulationcalibrated at 1.