Patent ID: 6792766
Filing Date: 2004-09-21
Classification: F24F,F25B,Y02B

Abstract:
A thermal zone demand controlled air conditioning system for heating and cooling the air of a building space having a plurality of thermal zones, comprising:an air circulation system for circulating air to and from said thermal zones and having a conditioned air chamber and a plurality of conditioned air supply conduits each being in communication with said conditioned air chamber and being in conditioned air supplying relation with a respective one of said thermal zones of the building space; a plurality of sources of heating and cooling being located externally of said building space and having first and second heat exchangers located in series within said air circulation system and being connected in thermal exchange circulating relation respectively with said plurality of sources of heating and cooling and selectively heating and cooling air flowing to said conditioned air chamber; a plurality of thermal zone blowers each having a multi-speed electric blower motor and being in communication with said conditioned air chamber and with respective conditioned air supply conduits and being connected in said air circulation system and conducting conditioned air from said conditioned air chamber through respective air supply conduits to respective thermal zones of said building space; a dc control power supply circuit and an ac power supply circuit; a plurality of thermal zone blower circuits each being operationally connected to respective multi-speed electric motors of said thermal zone blowers for control by said dc control power supply circuit, each of said zone blower circuits having multi-speed electric motor control devices controlling blower motor operation and speed by said ac power supply circuit; a plurality of thermostats each being located within a respective thermal zone of said building space and being electronically connected with said dc control power supply of said electronic controller circuitry and having respective low and high temperature signal conductors being energized at respective low and high predetermined temperatures; and electronic controller circuitry being coupled for sensed thermal demand control of said plurality of sources of heating and cooling and for control of said plurality of multi-speed electric blower motors of said thermal zone blowers for operation of one of said plurality of sources of heating and cooling to accommodate a predetermined range of thermal load and for operation of at least one other of said plurality of sources of heating and cooling to accommodate a range of thermal load in excess of said predetermined range of thermal load and for selective operation of said plurality of thermal zone blowers responsive to sensed conditions of thermal load of said plurality of thermal zones.