High pressure refrigerant after condenser cooling effect, become liquid and gaseous state, but must be under the condition of the liquid into the evaporator can have good cooling effect. So you must install the accumulator, the use of high pressure refrigerant stored in it, and then from the bottom of the liquid refrigerant to the evaporator pump outlet pipe.
The function of accumulator is stored supply liquid refrigerant evaporator. At the same time when the system maintenance, accumulator also need to be able to store all of the refrigerant in the system.
