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By sensing the ambient air in the heated space
including the Modine BA
While normal HVAC operation typically utilizes 0-20 psig
this switch is factory-sealed and non-adjustable
which allows technicians to connect gauges or charging hoses directly at the isolation point without installing additional tees
Carrier 50HJ680050 Economizer Controller 321702-401 By sensing the ambient airThe Carrier 50HJ680050 Economizer Controller is a critical OEM replacement component designed for vertical mount configurations in high tonnage commercial rooftop units (RTU). As a primary logic module, this device automates free cooling by precisely modulating damper actuators based on real time mixed air and enthalpy sensor data. By prioritizing outdoor air intake when ambient conditions are favorable, the 50HJ680050 significantly reduces the load