Key Benefits Universal Compatibility: Engineered as a legacy successor for UG-3C and UG-3PC components

including one 1/4" NPT and two 1/8" NPT ports

It features a broad multi-voltage input range of 10V-30V AC/DC or 120V AC

a liquid-filled model may be preferred

Schneider Electric (Barber Colman) THCR-4 Enthalpy Controller 30067439-890 Key Benefits Universal Compatibility: EngineeredThe Schneider Electric (Barber Colman) THCR 4 Enthalpy Controller is a high precision analog electronic sensor designed for economizer cooling control in commercial HVAC systems. This SPDT changeover control measures both dry bulb temperature and relative humidity to determine the total heat content of outdoor air, ensuring the system only utilizes free cooling when the outside air is more efficient than mechanical refrigeration. Operating on a 24V AC