Multi-type air conditioner with defrosting device

A multi-type air conditioner comprising:

• an outdoor unit installed outdoors in an outdoor, comprising a compressor, a four way valve connected to a discharge end of the compressor for selectively guiding the refrigerant according to operation conditions selectively, an outdoor heat exchanger connected to the four way valve, a defrosting device comprising a defrosting heat exchanger positioned at a side of the outdoor heat exchanger, a piping system for connecting the compressor, the four way valve, the outdoor heat exchanger and the defrosting device, and an outdoor fan at one side of the outdoor heat exchanger for blowing air from the defrosting heat exchanger to the outdoor heat exchanger;
• a plurality of indoor units each installed in a room and having an indoor heat exchanger and an electronic expansion valve having one end connected to one end of the indoor heat exchanger;
• and
• a distributor between the outdoor unit and the indoor units for selectively guiding refrigerant from the outdoor unit to the plurality of indoor units according to operation conditions, and guiding the refrigerant passed through the indoor units to the outdoor unit again,
• wherein the piping system comprises;
• a first connection pipeline, having one end connected to a discharge end of the compressor and an other end connected to the distributor, and the four way valve and the outdoor heat exchanger mounted between the ends in succession,
• a second connection pipeline having one end connected to the first connection pipeline, between the four way valve and the compressor, for guiding the refrigerant from the compressor to the distributor directly,
• a third connection pipeline connected between a suction end of the compressor and the distributor,
• a first guide pipeline having one end connected to the second connection pipeline, the other end connected to the defrosting heat exchanger, and having an electronic valve for controlling a flow rate of the refrigerant from the second connection pipeline, and
• a second guide pipeline having one end connected to the defrosting heat exchanger, and the other end connected to the first connection pipeline between the distributor and the outdoor heat exchanger.