Air-conditioning apparatus

Abstract

To provide an air-conditioning apparatus that is safer and has small conveying power for such as water at the indoor unit side can be made small. It is characterized in that a compressor 10 and a heat source side heat exchanger 12 are accommodated in a heat source apparatus 1 , an intermediate heat exchanger 15 and a pump 21 in a relay unit 3 , a use side heat exchanger 26 in an indoor unit 2 , respectively, and when a controller 60 makes the compressor 10 stop based on the thermo-off due to decrease in the heat load in the use side heat exchanger 26 or an operation stop instruction, the controller 60 makes the pump 21 stop after the compressor 10 is stopped or almost at the same time as the stop.

1 . An air-conditioning apparatus, comprising:
 at least one intermediate heat exchanger that exchanges heat between a refrigerant and a heat medium such as water and an antifreezing liquid that is different from said refrigerant;   a refrigeration cycle with which a compressor, an outdoor heat exchanger, at least one expansion valve, and a refrigerant side flow path of said intermediate heat exchanger are connected via piping through which said refrigerant flows;   a heat medium circulation circuit with which a heat medium side flow path of said intermediate heat exchanger, a pump, and a use side heat exchanger are connected via piping through which said heat medium flows; and   a controller that controls drive of said compressor and said pump, wherein   said compressor and said outdoor heat exchanger are accommodated in a heat source device,   said intermediate heat exchanger and said pump in a relay unit, and   said use side heat exchanger in an indoor unit, respectively, and   said controller performs at least one of operations to stop said pump after the stop of said compressor when stopping said compressor based on thermo-off due to decrease in air-conditioning load in said use side heat exchanger or an operation stop instruction and to start said compressor after said pump is started when starting said compressor based on the increase in air-conditioning load in said use side heat exchanger or operation start instructions while the compressor is stopped.   
     
     
         2 . The air-conditioning apparatus of  claim 1 , wherein
 a flow amount adjustment valve is provided that adjusts flow amount of said heat medium to flow through said each use side heat exchanger at either inlet side or outlet side of the heat medium side flow path of said use side heat exchanger, and   said controller stops said pump before stopping all the heat medium flow paths by said flow amount adjustment valve corresponding to the use side heat exchanger in operation lastly when said use side heat exchanger in operation lastly is stopped.   
     
     
         3 . (canceled) 
     
     
         4 . The air-conditioning apparatus of  claim 1 , wherein
 a flow amount adjustment valve is provided that adjusts flow amount of said heat medium to flow through said each use side heat exchanger at either inlet side or outlet side of the heat medium side flow path of said use side heat exchanger, and   said controller starts said pump after controlling said flow amount adjustment valve corresponding to said use side heat exchanger having the operation instruction or an air-conditioning load to make the heat medium flow path an open state.   
     
     
         5 . An air-conditioning apparatus, comprising:
 at least two intermediate heat exchangers that exchange heat between a refrigerant a heat medium such as water and an antifreezing liquid that is different from said refrigerant;   a refrigeration cycle with which a compressor, an outdoor heat exchanger, at least one expansion valve, and a refrigerant side flow path of said intermediate heat exchanger are connected via piping through which said refrigerant flows;   a heat medium circulation circuit with which a heat medium side flow path of said intermediate heat exchanger, at least two pumps, and a use side heat exchanger are connected via piping through which said heat medium flows; and   a controller that controls drive of said compressor and said pump, wherein   said compressor and said outdoor heat exchanger are accommodated in a heat source device,   said intermediate heat exchanger and said pump in a relay unit, and   said use side heat exchanger in an indoor unit, respectively, and   said controller performs at least one of operations to stop said pump that does not correspond to an operation mode after switching operation mode when performing switching from cooling-heating mixed operation mode that provides heating energy and cooling energy with said use side heat exchanger to heating only operation mode that provides only heating energy with said use side heat exchanger or cooling only operation mode that provides only cooling energy with said use side heat exchanger and to perform switching said operation mode after starting said pump that has been stopped before switching the operation mode when switching from heating only operation mode that provides only heating energy with said use side heat exchanger or cooling only operation mode that provides only cooling energy with said use side heat exchanger to cooling-heating mixed operation that provides heating energy and cooling energy with said use side heat exchanger.   
     
     
         6 . The air-conditioning apparatus of  claim 5 , wherein
 a flow amount adjustment valve is provided that adjusts flow amount of said heat medium to flow through said each use side heat exchanger at either inlet side or outlet side of the heat medium side flow path of said use side heat exchanger, and   said controller, when switching operation mode and stopping said pump that does not correspond to the operation mode, stops said pump before controlling said flow amount adjustment valve corresponding to the use side heat exchanger that does not correspond to the operation mode to make all the heat medium flow paths close.   
     
     
         7 . (canceled) 
     
     
         8 . The air-conditioning apparatus of  claim 5 , wherein
 a flow amount adjustment valve is provided that adjusts flow amount of said heat medium to flow through said each use side heat exchanger at either inlet side or outlet side of the heat medium side flow path of said use side heat exchanger, and   said controller, when making said pump start that has been stopped before switching operation mode, makes said pump start after controlling said flow amount adjustment valve corresponding to the use side heat exchanger that corresponds to the operation mode to make the heat medium flow path open.   
     
     
         9 . The air-conditioning apparatus of  claim 2 , wherein
 said flow amount adjustment valve is constituted by a two-way valve or a three-way valve.   
     
     
         10 . The air-conditioning apparatus of  claim 4 , wherein
 said flow amount adjustment valve is constituted by a two-way valve or a three-way valve.