Common Questions What do bubbles in the sight glass indicate during operation

Precise Fitment: Engineered to match the four-bolt valve bracket pattern for the Model 21-27 series

slip-free connection to damper shafts

The MARS model 12749 features a patented pressure-sensitive interrupter (PSI) that safely disconnects the capacitor in the event of internal pressure buildup

030" aluminum frame

Trane SWT1611 Limit Switch Common Questions What do bubblesThe Trane SWT1611 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial furnaces. This high limit control features a 3 inch insert to ensure accurate sensing within the supply plenum, effectively protecting the heat exchanger from damage caused by restricted airflow or blower failure. Operating as a normally closed SPST switch, the Trane SWT1611 is engineered to open the electrical