METHOD FOR DETECTING PIPING LENGTH IN AIR CONDITIONER AND AIR CONDITIONER IN WHICH THE METHOD IS APPLIED

摘要

PROBLEM TO BE SOLVED: To easily and precisely detect the length of a communicating piping in practical use by detecting the status of temperature drop of an indoor heat exchanger and the length of the communicating piping based on the ratio of temperature drop while an indoor unit shifts from heating operation to defrosting operation for switching over from the high pressure side to the low pressure side. SOLUTION: In a separate type air conditioner Z wherein an outdoor unit 1 and an indoor unit 2 are connected by communicating pipings 3 and 4, in the case of detecting the length of the communicating pipings 3 and 4 during a site construction of the air conditioner Z, three types of pipings of 5 m 30 mn and 50 m in length are prepared. When these pipings are selected for use, the temperature Tc of an indoor heat exchanger 21 is detected as heating operation is switched over to defrosting operation. The time from a point defrosting is started to a point the temperature Tc is lowered to the judgment temperature To is obtained, and defined as the judgment reference time of the piping length for indirect detection of the piping length based on the result of comparison with the temperature Tc.