Protects the HVAC unit against airflow deficiencies, which can cause refrigerant flooding, coil icing, and high-temperature conditions.
Monitors smoke/fire detector signal to provide positive shutdown of the HVAC supply fan even if the VFD has been placed in a local control override.
Assures code compliance and proper ventilation with synchronous control of the outside air damper position in conjunction with fan speed variations.
Integrates with most existing building automation systems to allow drive reset, fan speed override, or speed indication.
Recognizes economizer cooling calls, not just mechanical cooling calls, and increases fan speed.
Checks for a positive indication that the fan is running prior to allowing heating or cooling operation.