METHOD FOR JUDGING AMOUNT OF REFRIGERANT OF AIR CONDITIONER AND AIR CONDITIONER

摘要

The detection errors are reduced by making controls so that the degree of overcooling used as an index and a conversion value based on the degree of overcooling can be values used to easily judge the amount of refrigerant.  A method is for judging the amount of refrigerant of an air conditioner (1) including a refrigerant circuit (10).  The refrigerant circuit (10) comprises a heat source unit (2) having a compressor (21), a heat-source-side heat exchanger (23), and a cooling heat source regulating means (27), a use unit (4) having a use-side heat exchanger (41), an expansion mechanism (33), a liquid refrigerant communication pipe (6), and a gas refrigerant communication pipe (7).  The air conditioner (1) can perform at least a cooling operation.  It is judged by the method whether or not the amount of refrigerant in the refrigerant circuit is adequate.  The compressor frequency, the degree of overheating, and the degree of overcooling in a stable state in which the degree of overcooling is above a first predetermined value are stored.  After a predetermined period of time, the degree of overcooling of the refrigerant is determined while controls are being made so that the compressor frequency and the degree of overheating are the stored ones.  The determined degree of overcooling is compared with the stored one, and it is judged whether or not the amount of refrigerant in the refrigerant circuit is adequate.