초록 ▼

An air-handler includes an AC induction motor that drives a blower to move air across a heat exchanger. A switch system selectively determines whether the blower motor operates at its rated full speed or at a reduced speed. For full speed operation, the switch system couples an AC supply at a nomina

An air-handler includes an AC induction motor that drives a blower to move air across a heat exchanger. A switch system selectively determines whether the blower motor operates at its rated full speed or at a reduced speed. For full speed operation, the switch system couples an AC supply at a nominal line frequency directly to the blower motor and bypasses an inverter. For reduced speed operation, the switch system couples a lower frequency output of the inverter to the blower motor. The blower is operated at a reduced speed during a pre-run dehumidification mode, a post-run heat recovery mode, and/or an electronic air-cleaning mode. The switch system allows the rated current capacity of the inverter to be substantially less that the rated full load current of the blower motor.

대표청구항 ▼

[ I claim:] [1.]1. An air handler for an air conditioning system coupleable to an AC supply of a nominal frequency, comprising:a heat exchanger;a blower adapted to move air across said heat exchanger;an inverter having an inverter input and an inverter output, with said inverter input being coupleab

[ I claim:] [1.]1. An air handler for an air conditioning system coupleable to an AC supply of a nominal frequency, comprising:a heat exchanger;a blower adapted to move air across said heat exchanger;an inverter having an inverter input and an inverter output, with said inverter input being coupleable to said AC supply and said inverter output providing a reduced frequency that is lower than said nominal frequency;an AC induction motor coupled to said blower and having a motor input, said AC induction motor having a speed that varies with a voltage frequency at said motor input; anda switch system coupled to said inverter, said motor input, and said AC supply to selectively couple said motor input to said inverter output and said AC supply, said switch system having a full blower speed mode and a reduced blower speed mode, wherein said AC supply passes through said inverter to drive said AC induction motor when said switch system is in said reduced blower speed mode and said AC supply bypasses said inverter to drive said AC induction motor when said switch system is in said full blower speed mode.