CEC Compliant|CSA C.22.1

• Thermal safety switches detects the increased heat generated by the flue gas spillage and deactivates the furnace or boiler It will not allow the burner to restart until the switch has been manually reset On barometric draft controls and draft hoods to detect flue gas spillage and deactivate oil and gas burners A thermal safety switch is an electromechanical device which opens and closes contacts to control the flow of electrical current in response to temperature change The term thermal cutoff switch generally refers to how the switch is used

The WMO-1 blocked vent switch is recommended for installation with an oil fi red 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.