Users have the ability to run the fan in hand mode for balancing, troubleshooting, or to operate the fan before external controls are installed and operational. With only three buttons and an LED display, the compact HOA control is both user-friendly and functional. The fan can be enabled by using a dry contact closure or by providing a voltage (12-120 V) allowing the control to easily integrate the fan into a variety of systems. The compact HOA control provides a 24 V power source from existing line voltage at the fan. Editorial Calendar & Editor Assignmentsĭescription: The Hand/Off/Auto (HOA) control is the latest addition to Greenheck’s line of Vari-Green® controls that optimize ventilation system efficiency.
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