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this unit maintains system pressure safely below the relief valve setting
allowing technicians to fine-tune voltage levels to compensate for long wire runs or sensitive field controllers
including the LR
or bracket supported configurations to fit tight mechanical footprints
As a veteran-grade furnace draft inducer part
Trane SWT1999 Pressure Switch Els PW 17895 this unit maintains system pressureThe Trane SWT1999 is a critical SPDT differential pressure switch engineered for precision monitoring in residential and commercial HVAC applications. As an OEM Trane replacement part, this single pole double throw switch maintains system safety by detecting pressure variances across heat exchangers and inducer assemblies. Operating on a 0. 43 PSI set point, the SWT1999 ensures the inducer motor establishes proper draft before ignition, effectively