ZoneFirst MST Damper Actuator Refrigerant 3-tube in-shot replacement designed to

3-tube in-shot replacement designed to restore thermal efficiency in Lennox gas furnaces

often displaying a flash code for "pressure switch stuck open

The reset range is adjusted using the slider on the side of the unit

or a failing inducer motor that prevents proper drafting of combustion gases

You must select a compatible Emerson solenoid coil (typically the ASC2 or AMG series) based on your system's voltage requirements

ZoneFirst MST Damper Actuator Refrigerant 3-tube in-shot replacement designed toThe ZoneFirst MST Damper Actuator is a professional grade 24V damper motor engineered for reliable operation in forced air residential and light commercial HVAC zoning systems. This two position actuator operates on 24Vac with a high efficiency 6 watt power draw, ensuring minimal load on the HVAC zone control panel. Designed for a precise 30 second timing cycle for both opening and closing, the MST provides consistent airflow management and prevents