Precision Gas Metering: Delivers accurate natural gas flow to the burner assembly for standardized heat exchange

Its 5/16-inch diameter construction provides the structural rigidity required to handle the torque of larger dampers up to 25 square feet

If it remains open

Durable Construction: Engineered to withstand high-cycling environments within the furnace plenum for long-term reliability

018" orifice for propane will result in over-firing and a dangerous pilot flame

Marley Engineered Products 4520-2059-000 Limit Switch Precision Gas Metering: Delivers accurateThe Marley Engineered Products 4520 2059 000 is an OEM 160 230F AUTO Limit Switch designed for high accuracy temperature monitoring in HVAC heating systems. This heavy duty bimetal disc control serves as a critical safety component, engineered to automatically interrupt the circuit when internal temperatures exceed the 230F threshold and reset once conditions return to the 160F range. Frequently utilized in QMark and Berko heaters, this 4520 2059 000