Trane SWT3982 Switch L99H008 Check for 120V at the

Check for 120V at the primary leads

Compatible with 13 psi and 18 psi supply pressures for standard pneumatic control loops

As a primary furnace wire harness

alerting the contractor to underlying issues such as cracked heat exchangers

Trane SWT3982 Switch L99H008 Check for 120V at theThe Trane SWT3982 is a critical high limit reverse flow switch designed for precision thermal monitoring in light commercial and residential HVAC systems. Engineered for specific setpoints, this bimetal snap action switch features a 105F opening temperature and resets on a temperature fall at 95F. This 10 degree differential ensures stable cycling and prevents short cycling of the compressor or heater banks during low airflow conditions. Built to