Trane SWT1999 SPDT Differential Pressure Switch

The Trane SWT1999 SPSD is an essential control part of many Trane HVAC systems such as furnaces and air conditioners. It works as a pressure switch, which controls the variations of air pressure in the system. At a set level of 0.43 PSI of air pressure, the switch turns On or Off electrical equipment such as the blower motor. This is effective for the right functioning of the machine and for avoiding problems such as overheating or pressure increase. The SPSD is designed for operating temperatures from -40 to 167 degrees F and is typically fabricated from long-lived materials.