which are essential for protecting the heat exchanger from thermal stress and reducing audible duct "oil-canning" during cycle changes

If your system still utilizes HCFCs and mineral oil

though factory-configured for CCWLE rotation

meaning the necessary thermal or pressure-sensing leads are typically attached or calibrated for this specific PCB

Lennox 13U52 Heat Exchanger 318973-401 which are essential for protectingThe Lennox 13U52 Heat Exchanger Assembly is a precision engineered 240K BTU aluminum heat exchanger designed for high capacity thermal transfer in demanding light commercial and residential HVAC applications. As a genuine OEM Lennox replacement part, this assembly (part number 613927 09) ensures a perfect physical and pressure drop match for KGA, KGB, LGH, and LGM series units. The corrosion resistant aluminum construction provides superior thermal