Trane SWT3220 SPST Pressure Switch 1.29" WC

The Trane SWT3220 is a 4.25” long SPST pressure switch applicable for Trane HVAC equipment Basically, it operates based on air pressure as a safety and control device. It monitors the pressure of the system inside the ductwork or flue. Certain it unlocks the interior contacts when the pressure hits a particular threshold for this instance -1.29 Water Column. To this, the HVAC equipment alters the fan speed or shuts off the burner as a way of mechanism of countering it. However, when the pressure is than a different certain level of -1.44” Water Column the switch opens its contacts and when the pressure returns to normal, the system can work fine.