or direct sunlight

Improved Signal Reliability: High-grade sensors prevent voltage drop to the gas control valve

requiring no manual grease application during service

or there is significant scale/carbon buildup on the heating elements causing localized hot spots

Spartan Valves ME4530S Actuator 328140-751 or direct sunlightThe Spartan Valves ME4530S Actuator is a professional grade 24V 2 position spring return actuator engineered for reliable on off control in hydronic systems. Featuring a normally closed (N C) configuration, this unit ensures a fail safe "stem down" position during power disruptions, making it an essential component for HVAC zone valve control. Designed with a high strength, glass filled nylon composite housing, the ME4530S utilizes an electric gear