Patent ID: 6172476
Filing Date: 2001-01-09
Classification: H02P

Abstract:
A method for operating a system for conditioning a space, the system including a compressor with an electrical motor, an expansion valve, a condenser, an air mover with an electrical motor, and an evaporator, said method including the steps of:sensing the condition of the space to be treated;operating the compressor at a first preselected and fixed speed when the sensed condition indicates that the system should be operated at a maximum load;operating the compressor at a second preselected and fixed speed, lower than the first speed, when the sensed condition indicates that the system should be operated at a lesser load; anddriving the motor of the air mover by line current when the compressor operates at the first preselected speed and by a second source of fixed power at a frequency lower than the frequency of the line current, when the compressor operates at the second preselected speed.