Trane SWT4049 Pressure Switch 321702-401 The 591 bill of materials

The 591 bill of materials typically includes a sight glass and Rotalock connections (1-1/4" suction

it minimizes pressure drop and stabilizes airflow

To ensure maximum job-site versatility

The oversized 3-1/8 inch non-flutter gauges provide high-contrast scales for superior legibility and precision compared to standard small-orifice gauges

This industrial time switch also includes a manual override lever

Trane SWT4049 Pressure Switch 321702-401 The 591 bill of materialsThe Trane SWT4049 High Pressure Switch is a critical safety component designed for precise refrigerant circuit monitoring in residential and light commercial HVAC systems. As a genuine OEM Trane replacement part, this pressure actuated switch is engineered to protect the compressor from catastrophic failure by interrupting the electrical circuit when discharge pressure exceeds safe operating parameters. Utilizing a factory calibrated set point, the