Air-conditioning apparatus

Abstract

An air-conditioning apparatus includes a fan configured to deliver air toward the outdoor heat exchanger, a power unit configured to supply electric power to the fan, a fan input detector configured to detect a physical value related to the electric power supplied to the fan, and a controller configured to control the four-way valve to switch between a first operation in which the outdoor heat exchanger functions as an evaporator and a second operation in which the outdoor heat exchanger functions as a condenser. The first operation is switched to the second operation when the physical value detected by the fan input detector is equal to or larger than a reference value. The controller adjusts the reference value so that the reference value when refrigerant flowing through the outdoor heat exchanger has a high temperature is smaller than the reference value when the refrigerant has a low temperature.

1 . An air-conditioning apparatus comprising:
 a compressor,   an outdoor heat exchanger;   an indoor heat exchanger;   a switching device, the switching device being provided closer to a discharge side of the compressor than the outdoor heat exchanger and provided closer to the discharge side of the compressor than the indoor heat exchanger, the compressor, the outdoor heat exchanger, the indoor heat exchanger, and the switching device being connected one another;   a fan configured to deliver air toward the outdoor heat exchanger;   a power unit configured to supply electric power to the fan;   a fan input detector configured to detect a physical value correlated to the electric power supplied to the fan; and   a controller configured to control the switching device to switch between a first operation in which the outdoor heat exchanger serves as an evaporator and a second operation in which the outdoor heat exchanger serves as a condenser,   wherein the first operation is switched to the second operation when the physical value detected by the fan input detector is equal to or larger than a reference value, and   wherein the controller is configured to adjust the reference value such that the reference value when a refrigerant temperature flowing in the outdoor heat exchanger is high to be lower than the reference value when the refrigerant temperature flowing in the outdoor heat exchanger is low.   
     
     
         2 . An air-conditioning apparatus comprising:
 a compressor;   an outdoor heat exchanger;   an indoor heat exchanger;   a switching device, the switching device being provided closer to a discharge side of the compressor than the outdoor heat exchanger and provided closer to the discharge side of the compressor than the indoor heat exchanger, the compressor, the outdoor heat exchanger, the indoor heat exchanger, and the switching device being connected one another;   a fan configured to deliver air toward the outdoor heat exchanger;   a power unit configured to supply electric power to the fan;   a fan input detector configured to detect a physical value correlated to the electric power supplied to the fan; and   a controller configured to control the switching device to switch between a first operation in which the outdoor heat exchanger serves as an evaporator and a second operation in which the outdoor heat exchanger serves as a condenser,   wherein the first operation is switched to the second operation when the physical value detected by the fan input detector is equal to or larger than a reference value, and   wherein the controller is configured to control the compressor such that frequency of the compressor when a refrigerant temperature flowing in the outdoor heat exchanger is high to be higher than the frequency of the compressor when the refrigerant temperature flowing in the outdoor heat exchanger is low.   
     
     
         3 . The air-conditioning apparatus of  claim 1 , wherein the fan input detector detects a current value or a voltage value applied to an outdoor side motor configured to drive the fan, or electric power based on the current value and the voltage value. 
     
     
         4 . The air-conditioning apparatus of  claim 2 , wherein fan input detector detects a current value or a voltage value applied to an outdoor side motor configured to drive the fan, or electric power based on the current value and the voltage value.