Method for controlling stop operation of air conditioner

Abstract

A method for controlling a stop operation of an air conditioner having a compressor, a four-way valve, an electronic expansion valve (EEV), an indoor fan and an outdoor fan includes the steps of stopping the operations of the compressor and the indoor fan if an operation stop signal is inputted during a heating operation; and checking an amount of elapsed time after the turn-offs of the compressor and the indoor fan, and turning off the EEV and the outdoor fan if the amount of elapsed time reaches a preset reference time. The methods also includes the steps of detecting pressures at an inlet side and at an outlet side of the compressor to calculate a pressure difference; and turning off the four-way valve if the calculated pressure difference reaches a preset reference pressure difference.

1 . A method for controlling a stop operation of an air conditioner having a compressor, a four-way valve, an electronic expansion valve (EEV), an indoor fan and an outdoor fan, the method comprising the steps of:
 turning off the compressor and the indoor fan if an operation stop signal is issued during a heating operation of the air conditioner;   checking an amount of elapsed time and turning off the EEV and the outdoor fan if an amount of elapsed time after the turn-offs of the compressor and the indoor fan reaches a preset reference time;   detecting pressures at an inlet side and at an outlet side of the compressor to calculate a pressure difference therebetween; and   turning off the four-way valve if the calculated pressure difference reaches a preset reference pressure difference.   
   
   
       2 . The method of  claim 1 , wherein the preset reference pressure difference is about 3 mb. 
   
   
       3 . A method for controlling a stop operation of an air conditioner including a condenser and an evaporator in a structure that a compressor, a four-way valve, an EEV, an indoor fan and an outdoor fan are physically connected to one another, the method comprising the steps of:
 turning off of the compressor and the indoor fan if an operation stop signal is issued during a heating operation of the air conditioner;   turning off the EEV and the outdoor fan, if the amount of elapsed time after the turn-offs of the compressor and the indoor fan reaches a preset reference time;   detecting temperatures at the condenser and at the evaporator to calculate a temperature difference therebetween; and   turning off the four-way valve if the calculated temperature difference reaches a preset reference temperature difference.   
   
   
       4 . The method of  claim 4 , wherein the preset reference temperature difference is about 10° C. 
   
   
       5 . An air conditioner capable of preventing an impact noise generated after the completion of a heating operation of the air conditioner, which comprises:
 a compressor;   a four-way valve;   an electronic expansion valve;   an indoor fan;   an outdoor fan;   a first and a second pressure sensors for detecting pressures at an inlet side and at an outlet side of the compressor, respectively; and   a controller for turning off the compressor and the indoor fan, turning off the electronic expansion valve and the outdoor fan in a preset reference time after the turn-offs of the compressor and the indoor fan, and turning off the four-way valve if the pressure difference between the inlet side and the outlet side of the compressor reaches a preset reference pressure difference.   
   
   
       6 . The air conditioner of  claim 7 , wherein the preset reference pressure is about 3 mb. 
   
   
       7 . An air conditioner capable of preventing an impact noise generated after the completion of a heating operation of the air conditioner, which comprises:
 a compressor;   a four-way valve;   an electronic expansion valve;   an indoor fan;   an outdoor fan;   a condenser;   an evaporator;   a first and a second temperature sensors for detecting temperatures at the condenser and at the evaporator, respectively; and   a controller for turning off the compressor and the indoor fan, turning off the EEV and the outdoor fan in a preset reference time after the turn-offs of the compressor and the indoor fan, and turning off the four-way valve if the temperature difference between the condenser and the evaporator reaches a preset reference temperature difference.   
   
   
       8 . The air conditioner of claim  10 , wherein the preset reference temperature difference is about 10° C.