Trane SWT2979 Pressure Switch 321894-709 Rugged Construction: Built with a

Rugged Construction: Built with a NEMA 1 enclosure to protect internal snap-acting contacts from dust and environmental debris

Simplified Installation: OEM-spec wiring and mounting configuration reduce field labor and ensure historical performance standards

Designed for normally closed operation

Enhanced Diagnostics: Equipped with an onboard LED indicator that flashes specific HVAC fault codes

it ensures seamless compatibility when servicing older equipment

Trane SWT2979 Pressure Switch 321894-709 Rugged Construction: Built with aThe Trane SWT2979 Pressure Switch is a critical safety component designed for precise draft monitoring in high efficiency Trane and American Standard furnaces. As a OEM dual pressure switch, this part is the direct replacement for legacy part numbers BA20149 and C342634P62. This 2 stage air pressure switch features a dual diaphragm configuration engineered to sense specific vacuum thresholds: the high side is rated to open at 1. 93" W. C. and close at