The ball checks act as a safety shut-off

this assembly maintains HVACR system stability by storing excess charge during low-load periods and protecting the compressor from liquid slugging

Technicians typically look for a clicking sound without circuit engagement

California Proposition 65 Warning – This product contains chemicals known to the State of California to cause cancer and reproductive harm

Engineered for 24 VAC/VDC operation

Trane SWT2327 Switch 321142-301 The ball checks act asExperienced technicians recognize the Trane SWT2327 Switch as a critical safety component for high pressure monitoring. This OEM Trane replacement part is a Single Pole Single Throw (SPST) device with a normally closed (N C) contact configuration, providing immediate circuit interruption when system pressures exceed safe operating parameters. Designed for direct mounting on the high pressure line or near the compressor, this HVAC pressure switch