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Multi-type air conditioner comprising an outdoor unit installed in an outdoor, comprising a compressor, a refrigerant flow controlling part connected to a discharge end of the compressor for guiding the refrigerant proper to operation conditions selectively, an outdoor heat exchanger connected to th

Multi-type air conditioner comprising an outdoor unit installed in an outdoor, comprising a compressor, a refrigerant flow controlling part connected to a discharge end of the compressor for guiding the refrigerant proper to operation conditions selectively, an outdoor heat exchanger connected to the refrigerant flow controlling part, a defrosting device at a side of the outdoor heat exchanger, and a piping system connected between the parts, 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 proper to operation conditions, and guiding the refrigerant passed through the indoor units to the outdoor unit again.

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What is claimed is: 1. A multi-type air conditioner comprising: an outdoor unit installed outdoors, comprising a compressor, a refrigerant flow controller for selectively guiding the refrigerant according to operation conditions, an outdoor heat exchanger, a defrosting device positioned at a side o

What is claimed is: 1. A multi-type air conditioner comprising: an outdoor unit installed outdoors, comprising a compressor, a refrigerant flow controller for selectively guiding the refrigerant according to operation conditions, an outdoor heat exchanger, a defrosting device positioned at a side of the outdoor heat exchanger for removing frost from the outdoor heat exchanger during a heating operation mode of the multi-type air conditioner, and a piping system for connecting the compressor, the refrigerant flow controller, the outdoor heat exchanger and the defrosting device; 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 for connecting the discharge end of the compressor, the refrigerant flow controller, the outdoor hear exchanger and the distributor in this order, a second connection pipeline for guiding compressed refrigerant discharged from the discharge end of the compressor to the distributor, and a third connection pipeline for connecting the refrigerant flow controller, a suction end of the compressor and the distributor. 2. The multitype air conditioner as claimed in claim 1, wherein the refrigerant flow controller comprises a four way valve for selectively guiding the refrigerant from the compressor to the outdoor heat exchanger or to the distributor according to an operation condition. 3. The multi-type air conditioner as claimed in claim 1, wherein the distributor comprises; a guide piping system for guiding the refrigerant introduced thereto through the first connection pipeline or the second connection pipeline in the outdoor unit to the indoor units, and for guiding the refrigerant from the indoor units to the first connection pipeline or to the third connection pipeline in the outdoor unit, and a valve bank on the guide piping system for controlling refrigerant flow such that the refrigerant flows in/out of the indoor units, selectively. 4. The multi-type air conditioner as claimed in claim 3, wherein the guide piping system comprises; a high pressure liquid refrigerant connection pipeline having one end connected to the first connection pipeline in the outdoor unit, high pressure liquid refrigerant branch pipelines having first ends equal in number to a number of indoor units branching from the high pressure liquid refrigerant connection pipeline and the other ends connected to the other ends of the indoor electronic expansion valves respectively, a high pressure gas refrigerant connection pipeline having one end connected to the second connection pipeline in the outdoor unit directly, high pressure gas refrigerant branch pipelines having first ends equal in number to a number of indoor units branching from the high pressure gas refrigerant connection pipeline, and the other ends directly connected to the other ends of the indoor heat exchangers of respective indoor units respectively, a low pressure gas refrigerant connection pipeline having one end connected to the third connection pipeline in the outdoor unit directly, and low pressure gas refrigerant branch pipelines having first ends equal in number to a number of indoor units branching from the low pressure gas refrigerant connection pipeline, and the other ends connected to the other ends of the indoor heat exchangers of the respective indoor units to which the high pressure gas refrigerant branch pipelines are connected. 5. The multi-type air conditioner as claimed in claim 4, wherein the valve bank comprises; selection valves on the high pressure gas refrigerant branch pipelines and the low pressure gas refrigerant branch pipelines for closing the valves on the high pressure gas refrigerant branch pipelines and opening the valves on the low pressure gas refrigerant branch pipelines for room cooling, and opening/closing the valves in an opposite manner for room heating, for controlling refrigerant flow. 6. The multi-type air conditioner as claimed in claim 1, wherein the defrosting device has one end connected to the second connection pipeline, and the other end connected to a first connection pipeline between the distributor and the outdoor heat exchanger. 7. The multi-type air conditioner as claimed in claim 6, wherein the defrosting device comprises; a first guide pipeline having one end connected to the second connection pipeline for guiding refrigerant from the second connection pipeline, a defrosting heat exchanger having one end connected to the other end of the first guide pipeline; and a second guide pipeline having one end connected to the other end of the defrosting heat exchanger, and the other end connected to the first connection pipeline between the distributor and the outdoor heat exchanger. 8. The multi-type air conditioner as claimed in claim 7, wherein the defrosting device further comprises an electronic valve on the first guide pipeline for controlling a flow rate of the refrigerant from the second connection pipeline. 9. The multi-type air conditioner as claimed in claim 8, wherein the operation conditions comprise; a first mode for cooling all rooms, a second mode for cooling a majority of rooms and heating a minority of rooms, a third mode for heating all rooms, a fourth mode for heating a majority of rooms and cooling a minority of rooms, a fifth mode for defrosting the outdoor heat exchanger concurrently with the third mode operation, and a sixth mode for making an operation for defrosting the outdoor heat exchanger concurrently with the fourth mode operation. 10. The multi-type air conditioner as claimed in claim 9, wherein the outdoor unit further comprises; a check valve on the first connection pipeline between the distributor and the outdoor heat exchanger for passing refrigerant from the outdoor unit toward the distributor in the first or second mode of operation, and a heating expansion pipe having a refrigerant expansion element extending in parallel to the check valve for guiding refrigerant introduced from the distributor through the first connection pipeline to the outdoor heat exchanger in the third to sixth mode of operation. 11. The multi-type air conditioner as claimed in claim 10, wherein the second guide pipeline is connected to the first connection pipeline between the heating expansion pipe and the distributor. 12. The multi-type air conditioner as claimed in claim 11, wherein the defrosting device further comprises; a bypass pipe having one end connected to the first connection pipeline between the refrigerant flow controller and the outdoor heat exchanger, and the other end connected to the first guide pipeline; a three way valve on an intersection of the bypass pipe and the first guide pipeline for converting a flow direction of the refrigerant according to an operation mode; and an expansion element on the second guide pipeline for expanding refrigerant introduced from the distributor, wherein the defrosting heat exchanger serves as an evaporator together with the outdoor heat exchanger in the third or fourth mode. 13. The multi-type air conditioner as claimed in claim 12, wherein the expansion element on the second guide pipeline comprises an electronic expansion valve. 14. The multi-type air conditioner as claimed in claim 11, wherein the defrosting device further comprises; a first bypass pipe having one end connected to a first connection pipeline connected between the refrigerant flow controller and the outdoor heat exchanger, and the other end connected to the first guide pipeline, a first three way valve on an intersection of the first bypass pipe and the first guide pipeline for changing a flow direction of the refrigerant according to an operation mode, a second bypass pipe having one end connected to a first connection pipeline between the outdoor heat exchanger and the heating parallel expansion pipe, and the other end connected to the second guide pipeline, and a second three way valve on an intersection of the second guide pipeline and the bypass pipe for changing a flow direction of the refrigerant according to the operation mode, wherein the defrosting heat exchanger serves as an evaporator together with the outdoor heat exchanger in the third or fourth mode. 15. The multi-type air conditioner as claimed in claim 1, wherein the outdoor unit further comprises an outdoor fan at a side of the outdoor heat exchanger. 16. The multi-type air conditioner as claimed in claim 7, wherein the outdoor unit further comprises an outdoor fan at a side of the outdoor heat exchanger. 17. The multi-type air conditioner as claimed in claim 16, wherein the outdoor fan blows air from a side of the defrosting heat exchanger to a side of the outdoor heat exchanger. 18. 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. 19. The multi-type air conditioner as claimed in claim 18, wherein the outdoor unit further comprises; a check valve on the first connection pipeline between the distributor and the outdoor heat exchanger for passing refrigerant from the outdoor unit toward the distributor when all rooms are cooled, or a majority of rooms are cooled and a minority of rooms are heated, and a heating expansion pipe having a refrigerant expansion element extending in parallel to the check valve for guiding refrigerant introduced from the distributor through the first connection pipeline to the outdoor heat exchanger when all rooms are heated, or a majority of rooms are heated and a minority of rooms are cooled. 20. The multi-type air conditioner as claimed in claim 19, wherein the second guide pipeline is connected to the first connection pipeline between the heating expansion pipe and the distributor. 21. The multi-type air conditioner as claimed in claim 20, wherein the piping system further comprises; a first bypass pipe having one end connected to a first connection pipeline connected between the tour way valve and the outdoor heat exchanger, and the other end connected to the first guide pipeline, a first three way valve on an intersection of the first bypass pipe and the first guide pipeline for changing a flow direction of the refrigerant according to an operation mode, a second bypass pipe having one end connected to a first connection pipeline between the outdoor heat exchanger and the heating parallel expansion pipe, and the other end connected to the second guide pipeline, and a second three way valve on an intersection of the second guide pipeline and the bypass pipe for changing a flow direction of the refrigerant according to the operation mode, wherein the defrosting heat exchanger serves as an evaporator together with the outdoor heat exchanger in an operation mode for heating all rooms, or heating a majority of rooms and cooling a minority of rooms. 22. The multi-type air conditioner as claimed in claim 21, wherein the outdoor fan blows air from the defrosting heat exchanger to the outdoor heat exchanger. 23. The multi-type air conditioner as claimed in claim 1, wherein one end of the defrosting device is configured to selectively establish fluid communication with the discharge end of the compressor, and the other end of the defrosting device is configured to selectively establish a connection to the first connection pipeline between the defrosting device and the distributor.