DRIVE CONTROLLER FOR AIR CONDITIONER

摘要

PURPOSE:To improve driving capacity by eliminating an accumulator and to avoid a wet operation at the time of defrosting. CONSTITUTION:A receiver 4 is provided at a main line 9a, and a bypass passage 4a having an ON/OFF valve SV to feed gas refrigerant in the receiver 4 to a low-pressure line is provided. Further, defrost executing means 11 for executing defrosting by fully closing a motor-driven expansion valve 5 and opening the valve SV is provided. Initial control means 12 for closing the valve SV at an initial time of defrosting is provided. Overheat control means 14 for once opening the valve 5 to a predetermined opening degree when a discharge tube temperature Td becomes a predetermined temperature or lower is provided. Drive shifting means 15 for gradually opening the valve 5 by opening the valve SV in a heating cycle when the defrosting is finished is provided.