Heat source unit

A heat source unit of an air conditioner having a refrigerant circuit, comprising:

• a compressor;
• a heat-source-side heat exchanger;
• a refrigerant regulator storing a refrigerant;
• an introducing pipe that is branched off from a discharge-side pipe of the compressor and connected to the refrigerant regulator, and introduces the refrigerant discharged from the compressor into the refrigerant regulator;
• an accumulator provided in an intake-side pipe;
• a lead-out pipe that is connected from the refrigerant regulator to the intake-side pipe of the compressor, and leads out the refrigerant stored in the refrigerant regulator into the intake-side pipe, the lead-out pipe being connected to the intake-side pipe at a position upstream of the accumulator;
• an introducing pipe electromagnetic valve provided in the introducing pipe;
• a lead-out pipe electromagnetic valve provided in the lead-out pipe;
• a capillary tube that is provided in the lead-out pipe;
• a liquid refrigerant branched pipe that is branched off from a liquid refrigerant pipe and connected to the refrigerant regulator;
• an intake-side connection pipe connected to the refrigerant regulator and the intake-side pipe;
• a liquid refrigerant branched pipe electromagnetic valve provided in the liquid refrigerant branched pipe;
• an intake-side connection pipe electromagnetic valve provided in the intake-side connection pipe;
• and
• a control unit configured to open both the introducing pipe electromagnetic valve and the lead-out pipe electromagnetic valve to load refrigerant stored in the refrigerant regulator into the refrigerant circuit and to close both the introducing pipe electromagnetic valve and the lead-out pipe motor-operated valve when the refrigerant circuit is loaded, wherein
• one end of the introducing pipe is connected to an upper part of the refrigerant regulator and located above a liquid level of liquid refrigerant stored in the refrigerant regulator,
• one end of the lead-out pipe is connected to a bottom of the refrigerant regulator and located below the liquid level of liquid refrigerant stored in the refrigerant regulator,
• one end of the liquid refrigerant branched pipe is connected to an upper part of the refrigerant regulator and located above the lk uid level of lk uid refrigerant stored in the refrigerant regulator,
• one end of the intake-side connection pipe is connected to an upper part of the refrigerant regulator and located above the liquid level of liquid refrigerant stored in the refrigerant regulator,
• the control unit starts a first control of stopping the compressor, setting the liquid refrigerant branched pipe electromagnetic valve to a closed state and setting the intake-side connection pipe electromagnetic valve to an open state, whereby the refrigerant regulator communicates with the intake-side pipe in the first control,
• when the first control is completed, the control unit starts a second control of setting the liquid refrigerant branched pipe electromagnetic valve to the open state and setting the intake-side connection pipe electromagnetic valve to the closed state, whereby the refrigerant regulator communicates with the liquid refrigerant pipe, and
• when the second control is completed, the control unit sets both the liquid refrigerant branched pipe electromagnetic valve and the intake-side connection pipe electromagnetic valve to the closed state.