Patent ID: 7748639
Filing Date: 2010-07-06
Classification: F24F

Abstract:
1. A heating and cooling system for a multi-level space having at least one lower level return air duct and at least one upper level return air duct, the system comprising: a thermostat for controlling the operation of the heating or cooling system through either a low voltage cooling activation signal or a low voltage heating activation signal; and a motorized damper being installed in each of the at least one lower level return duct, each motorized damper having connection means for receiving at least a low voltage heating activation signal from the thermostat, each motorized damper being configured to drive the damper to an open position when the connection means receives a low voltage heating activation signal, wherein the motorized damper is operatively closed when the thermostat alternatively transmits a low voltage cooling activation signal such that the cooling system substantially receives no air flow through each lower level return air duct and effectively receives only air flow from the upper level of the space.