Modine 5H0547510021 Orifice 318172-701 as operating with an out-of-tolerance

as operating with an out-of-tolerance run capacitor can lead to thermal overload and premature winding failure

You should match the 667294R part number against your unit's parts list

Negative Pressure Optimized: Specifically recommended for appliances where the vent system normally maintains negative pressure

ensuring that combustion gases are safely directed into the venting system without leakage into the cabinet or conditioned space

verify resistance values against the Weil McLain temperature/resistance chart found in the boiler service manual for diagnosis

Modine 5H0547510021 Orifice 318172-701 as operating with an out-of-toleranceThe Modine 5H0547510021 Orifice is a precision engineered Natural Gas Main Orifice designed for consistent gas flow regulation in commercial and industrial Modine heating units. As a critical component in the burner manifold assembly, this orifice is calibrated to maintain the specific manifold pressure required for efficient combustion and clean flame characteristics. Built from high grade, corrosion resistant brass, it ensures long term reliability