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The FIELDPIECE 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 detects 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.
The WMO-1 is designed to detect blocked vent systems in oil-fired appliances, responding to hot flue gases and enabling the shutoff of the oil burner, requiring manual reset.
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