Weil McLain specifically requires aluminized steel burners for these models to prevent carry-over problems

the 700-400 offers consistent 3

With a 26-inch diameter and a 31-degree pitch

Advanced Diagnostics: Built-in LED flash codes allow technicians to quickly identify low input voltage or flame out of sequence faults

as this sensor is specifically calibrated for 10k ohm or 20k ohm thermistor curves depending on the specific condensing unit or heat pump model

Lennox 39W70 Expansion Valve R-407A Weil McLain specifically requires aluminizedThe Lennox 39W70 Expansion Valve is a critical OEM replacement part designed for precise refrigerant flow control in high performance HVACR systems. Engineered for compatibility with Lennox G43 series GreenHeat and G52 GreenVent heat pumps, this thermostatic expansion valve (TXV) ensures optimal superheat maintenance across varying load conditions. For technicians servicing residential air conditioning or commercial refrigeration units, the 39W70 is