During Occupied mode operation, indoor fan operation will be accompanied by economizer dampers moving to Minimum Position set point for ventilation. If indoor fan is off, dampers will close. During Unoccupied mode operation, dampers will remain closed unless a Cooling (by free cooling) or mechanical cooling demand is received. When the outside air is not cool enough for free cooling, the unit cooling sequence will be controlled directly by the space thermostat. Outside air damper position will be closed or Minimum Position as determined by Occupancy mode and fan signal. When free cooling is available as determined by the appropriate changeover command (dry bulb, outdoor enthalpy, differential dry bulb, or differential enthalpy), a call for cooling (Y1 closes at the thermostat) will cause the economizer control to modulate the dampers open and closed to maintain the unit supply air temperature. Default supply air temperature is 53°F, with a range of 38°F to 70°F. Compressor will not run. If the outside air is not cold enough to satisfy the space temperature, space temperature will rise until Y2 is closed. The economizer control will call for compressor operation. Dampers will modulate to maintain set point with Compressor 1 operation. The economizer control will lock out compressor operation when outside air temperature is below set point (default 32°F). When space temperature demand is satisfied (thermostat Y1 opens), the dampers will return to Minimum Damper position if indoor fan is running or fully closed if fan is off.