Load control system having an energy savings mode

A method of controlling a motorized window treatment comprising a window treatment fabric for covering a window in a space of the building, the building having a heating and cooling system, the method comprising:

• receiving a demand response command;
• calculating a position of the sun;
• determining if the calculated position of the sun indicates that the window is receiving direct sunlight;
• determining whether the heating and cooling system is heating or cooling the building;
• adjusting the fabric to limit a sunlight penetration depth in the space to a maximum penetration depth in response to the demand response command when the calculated position of the sun indicates that the window is not receiving direct sunlight and the heating and cooling system is heating the building;
• and
• adjusting the fabric to limit the sunlight penetration depth in the space to an increased maximum penetration depth in response to the demand response command when the calculated position of the sun indicates that the window is receiving direct sunlight and the heating and cooling system is heating the building.

A load control system for a building having a heating and cooling system and a window located in a space of the building, the load control system comprising:

• a motorized window treatment comprising a window treatment fabric for covering the window, the motorized window treatment operable to move the fabric between a fully-open position in which the window is not covered and a fully-closed position in which the window is covered;
• a temperature control device for controlling a setpoint temperature of the heating and cooling system to thus control a present temperature in the building, the temperature control device operable to determine whether the heating and cooling system is heating or cooling the building;
• and
• an occupancy sensor for detecting whether the space is occupied or unoccupied;
• wherein, when the space is unoccupied and the heating and cooling system is heating the building, the motorized window treatment opens the fabric if a calculated position of the sun indicates that the window is receiving direct sunlight, and closes the fabric if the calculated position of the sun indicates that the window is not receiving direct sunlight, and
• when the space is occupied, the motorized window treatment is operable to move the fabric according to a predetermined timeclock schedule in order to limit a sunlight penetration depth in the space to a maximum penetration depth.

A method of controlling a motorized window treatment comprising a window treatment fabric for covering a window in a space of the building, the building having a heating and cooling system, the method comprising:

• detecting whether the space is occupied or unoccupied;
• calculating a position of the sun;
• determining if the calculated position of the sun indicates that the window is receiving direct sunlight;
• determining whether the heating and cooling system is heating or cooling the building;
• opening the fabric when the space is unoccupied, the heating and cooling system is heating the building, and the calculated position of the sun indicates that the window is receiving direct sunlight;
• closing the fabric if the space is unoccupied, the heating and cooling system is heating the building, and the calculated position of the sun indicates that the window is not receiving direct sunlight;
• and
• adjusting the fabric to limit a sunlight penetration depth in the space to a maximum penetration depth if the space is occupied.