Description
The Trane SWT3939 Thermal Switch is a temperature control unit used to regulate heating and cooling system operation based on preset thermal limits in HVAC systems. It’s a bimetal sensing element that changes state when temperatures reach 140F to open the circuit and resets at 110F to close it again, ensuring controlled cycling of equipment. It consists of furnaces, air handlers, and ventilation systems. It improves temperature regulation, supports system operation and helps prevent overheating or inefficient cycling. Its operational consistency reduces component stress and provides consistent performance in systems.
