always ensure your control air is clean

ensuring a secure electrical interface between the high-limit switch and the thermocouple circuit

Designed with dual-voltage flexibility for 120/240V systems

For contractors managing large-scale maintenance

you know that keeping a blower shaft or fan assembly stable depends entirely on the integrity of your pillow block bearing

Lochinvar & A.O. Smith 100208661 Flow Switch 321894-706 always ensure your control airThe Lochinvar & A. O. Smith 100208661 Flow Switch, also identified by part number 781621 or alias FS8 W, is a heavy duty liquid flow switch engineered for precise proof of flow detection in high efficiency commercial boiler systems and water heaters. Designed as a direct HVAC replacement part for the McDonnell & Miller FS8 W, this unit features a durable stainless steel #3 paddle configuration to ensure reliable contact closure once the system pump