Heating dedicated air conditioner

Abstract

A heating dedicated air conditioner includes a compression mechanism, an indoor heat exchanger, an outdoor heat exchanger, an expansion mechanism provided between one end of the indoor heat exchanger and one end of the outdoor heat exchanger, a four-way switching valve switchable between first and second states of connection between the compressor and the heat exchangers, a fan ventilating the indoor heat exchanger, and a control unit controlling at least the compressor, the expansion mechanism, the four-way switching valve, and the fan. The control unit switches the four-way switching valve to the second state in a test operation mode, which includes a drain water inhibited interval during which drain water inhibition control is performed. The control unit operates the compressor and stops the fan when the drain water inhibition control is performed.

1 . A heating dedicated air conditioner, comprising:
 a compression mechanism;   an indoor heat exchanger;   an outdoor heat exchanger;   an expansion mechanism disposed between one end of the indoor heat exchanger and one end of the outdoor heat exchanger;   a four-way switching valve switchable between
 a first state in which a discharge side of the compression mechanism and an other end of the indoor heat exchanger are connected and a suction side of the compression mechanism and an other end of the outdoor heat exchanger are connected, and 
 a second state in which the discharge side of the compression mechanism and the other end of the outdoor heat exchanger are connected and the suction side of the compression mechanism and the other end of the indoor heat exchanger are connected; 
   a fan arranged to ventilate the indoor heat exchanger; and   a control unit configured to control at least the compression mechanism, the expansion mechanism, the four-way switching valve, and the fan, the control unit being configured to switch the four-way switching valve to the second state in a test operation mode,   the test operation mode including a drain water inhibited interval during which drain water inhibition control is performed, the control unit being configured to operate the compression mechanism and stop the fan when the drain water inhibition control is performed.   
     
     
         2 . The heating dedicated air conditioner according to  claim 1 , further comprising:
 a gas side shutoff valve disposed between the other end of the indoor heat exchanger and the four-way switching valve; and   a pressure detector mounted to a gas refrigerant pipe, the gas refrigerant pipe connecting the other end of the indoor heat exchanger and the suction side of the compression mechanism.   
     
     
         3 . The heating dedicated air conditioner according to  claim 2 , further comprising:
 an indoor casing; and   an outdoor casing; wherein,   the indoor heat exchanger and the fan being housed in the indoor casing, and   the compression mechanism, the outdoor heat exchanger, the expansion mechanism, the four-way switching valve, the gas side shutoff valve, and the pressure detector being housed in the outdoor casing.   
     
     
         4 . The heating dedicated air conditioner according to  claim 1 , further comprising:
 a gas-liquid separator disposed between the suction side of the compression mechanism and the four-way switching valve.   
     
     
         5 . The heating dedicated air conditioner according to  claim 1  wherein
 the drain water inhibited interval occupies 80% or more of the entire interval of the test operation mode. 
 
     
     
         6 . The heating dedicated air conditioner according to  claim 5 , wherein
 a first interval other than the drain water inhibited interval is a beginning interval of the entire interval of the test operation mode.   
     
     
         7 . The heating dedicated air conditioner according to  claim 4 , wherein
 the drain water inhibited interval occupies 80% or more of the entire interval of the test operation mode.   
     
     
         8 . The heating dedicated air conditioner according to  claim 7 , wherein
 a first interval other than the drain water inhibited interval is a beginning interval of the entire interval of the test operation mode.   
     
     
         9 . The heating dedicated air conditioner according to  claim 2 , further comprising:
 a gas-liquid separator disposed between the suction side of the compression mechanism and the four-way switching valve.   
     
     
         10 . The heating dedicated air conditioner according to  claim 2 , wherein
 the drain water inhibited interval occupies 80% or more of the entire interval of the test operation mode.   
     
     
         11 . The heating dedicated air conditioner according to  claim 10 , wherein
 a first interval other than the drain water inhibited interval is a beginning interval of the entire interval of the test operation mode.   
     
     
         12 . The heating dedicated air conditioner according to  claim 3 , further comprising:
 a gas-liquid separator disposed between the suction side of the compression mechanism and the four-way switching valve.   
     
     
         13 . The heating dedicated air conditioner according to  claim 3 , wherein
 the drain water inhibited interval occupies 80% or more of the entire interval of the test operation mode.   
     
     
         14 . The heating dedicated air conditioner according to  claim 13 , wherein
 a first interval other than the drain water inhibited interval is a beginning interval of the entire interval of the test operation mode.