MARS 39004 Switch suitable for various commercial HVAC

suitable for various commercial HVAC maintenance tasks

" where flames exit the heat exchanger

This P100 series pressure control is compatible with all non-corrosive refrigerants

OEM Compatibility: Authentic Amana-Goodman replacement part ensures exact fitment and restores original equipment performance

25 inch female quick connect terminals on both ends

MARS 39004 Switch suitable for various commercial HVACThe MARS 39004 is a professional grade 390 Series SPDT Changeover Switch designed for automatic seasonal transition in hydronic heating and cooling systems. Specifically engineered for fan coil units, this summer winter changeover switch manages thermostat logic based on water temperature, ensuring seamless climate control without manual intervention. It features a high reliability SL 8 thermostat enclosed in a sealed case for environment protection