Field Controls 46086900 WMO-1 Oil Fired Equipment Safety Switch (Blocked Flue Switch) The WMO-1 Blocked Vent Switch is recommended for installation with an oil fired appliance that normally operates with its vent system under a negative pressure This device is intended to detect a blocked vent system, responds to hot flue gases backing up through its heat transfer tube, and can be wired to shut off the oil burner. It requires manual resetting.
What's Included 1-Blocked vent switch assembly 1-Gasket 1-Instruction sheet