Trane SWT3335 Flow Switch R-410A the Lennox 13H39 provides the

the Lennox 13H39 provides the necessary lift for systems requiring robust static pressure performance without compromising electrical efficiency

As a normally closed (NC) 2-way valve

this 120V 10W HVAC coil simplifies replacements with its internal junction box and dual 1/2-inch knockouts

this blower scroll housing features robust spot-welded steel construction to ensure long-term structural integrity and vibration resistance

Field diagnostics are simplified via the burner circuit test button

Trane SWT3335 Flow Switch R-410A the Lennox 13H39 provides theThe Trane SWT3335 Flow Switch is a high precision 24V Thermal Sensor Flow Switch designed for critical monitoring in industrial and commercial HVAC systems. Utilizing thermal dispersion technology, this OEM component detects fluid velocity and temperature shifts within the piping system to ensure optimal operational sequences. It is an essential safeguard for Trane AquaStream chillers, CenTraVac units, and Series R systems, providing a control signal