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replacing an aged or drifting OEM sensor with this genuine Marley component ensures factory-spec thermal protection
it integrates seamlessly with McDonnell & Miller RS-1-LP and Series 150E sensors
the precision of an ECM allows for variable speed adjustments
How can I verify if the 221158 switch is faulty
Lennox 77W04 Gas Valve 323055-751 replacing an aged or driftingThe Lennox 77W04 Gas Valve is a critical OEM component specifically engineered for multi stage heating systems requiring high precision fuel regulation. This 24v 2 stage gas valve (White Rodgers 36J55 254P1) is designed with a 1 2" NPT inlet and outlet, supporting both direct spark and hot surface ignition configurations. As a high performance HVAC replacement part, it handles a maximum pressure of 1 2 PSI with a factory set high fire of 3. 5" W. C.
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