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

providing the durability needed for demanding multi-section commercial and residential boiler installations

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

leak-free fit for standard manifold sets

Trane SWT1611 Limit Switch The MARS model 12749 featuresThe 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