Dual-Function Sensing: Combines a high-accuracy humidity transmitter with a 1k Ohm nickel RTD temperature sensor in a single wall-mount housing

ensuring the valve defaults to the closed position during power loss

On-Board Manual Override: Features a 3-position switch for streamlined troubleshooting and manual circuit control

and Port AB is the common outlet

the 8-3/4 inch length is the standard size for most universal mounting configurations

Schneider Electric (Barber Colman) MA-318 Actuator Refrigerant Dual-Function Sensing: Combines a high-accuracyThe Schneider Electric (Barber Colman) MA 318 is a heavy duty two position oil submerged actuator designed for the reliable operation of dampers, valves, and specialized HVAC linkages. Operating on a 24V AC power supply, this spring return actuator provides a robust 60 lb in torque output, ensuring positive closure or opening upon power loss. For field technicians upgrading legacy systems, the MA 318 replaces ADHA 200, MA 308, and MA 315 models