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The disc is factory-installed to provide the equal percentage flow characteristic
Precision Control: Calibrated for 160°F maximum temperature to maintain consistent hot water supply and tank protection
and low-pressure steam up to 15 psig
this specific model is designed and ASME Section IV certified for hot water heating boilers and hydronic systems only
Trane SWT3937 Switch 319852-301 The disc is factory-installed toThe Trane SWT3937 is a precision engineered thermal limit switch designed for critical temperature regulation in HVAC and light commercial applications. This OEM thermal switch features a reliable 125F open and 95F close threshold, serving as a primary safety control to monitor airstream temperatures and prevent overheating conditions. Built with an SPST contact arrangement and an enclosed disc design, the SWT3937 ensures consistent performance with a