This normally closed (NC) pressure switch monitors the combustion air intake

and the ZF series

The V47AC-4 includes a Style 4 temperature bulb (11/16" diameter x 3 1/4" long) with a 6' capillary for remote sensing

75mm for the coil) for fast

You should verify continuity across the element terminals

Velocity Boiler Works (Crown) 96-032 Vent Damper 340155-7024 This normally closed (NC) pressureAs a field tech, you know that a failed flue damper is one of the most common reasons for a "no heat" call on a steam or hydronic system. The Velocity Boiler Works (Crown) 96 032 Vent Damper is the heavy duty, 6 inch factory replacement designed specifically for Crown boiler systems and Velocity steam boilers. This automatic flue damper is engineered to eliminate standby heat loss by sealing the vent pipe the moment the burner cycles off, keeping your