Maxitrol M520B 3 4 Gas Valve 319847 401 providing the heavy duty electrical switching providing the heavy duty electrical switching required to energize defrost heaters and manage reversing valve transitions This genuine York OEM part serves as the central logic unit for two stage gas furnaces Industrial Grade Build: Stamped steel and brass construction ensures a reliable seal and long term performance under 30 PSI static pressure conditions How do I adjust the minimum firing rate
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Maxitrol M520B-3/4 Gas Valve 319847-401 providing the heavy-duty electrical switching