Patent ID: 8020393
Filing Date: 2011-09-20
Classification: F25B,Y02B

Abstract:
1. A heat pump type hot water supply outdoor apparatus, in which a compressor, a water heat exchanger for carrying out heat exchange between water and refrigerant, a first pressure reduction unit, a medium pressure receiver, a second pressure reduction unit, and an air heat exchanger for carrying out heat exchange between air and refrigerant are connected circularly, heat is supplied from outside air by the air heat exchanger, and heat is supplied to water by the water heat exchanger comprising: an injection circuit which is a bypass for a part of the refrigerant between the medium pressure receiver and the second pressure reduction unit, to inject the part of refrigerant into a compression chamber of the compressor, and has a third pressure reduction unit and an internal heat exchanger for carrying out heat exchange between the refrigerant whose pressure is reduced by the third pressure reduction unit and the refrigerant between the medium pressure receiver and the second pressure reduction unit; a pressure detection sensor disposed in the vicinity of a discharge port of the compressor for detecting a condensing pressure of the refrigerant; and a controller for carrying out a control for starting an injection control at the time when a condensing pressure detected by the pressure detection sensor or a condensing temperature calculated from the condensing pressure becomes a first predetermined value or more, and stopping the injection control at the time when the condensing pressure detected by the pressure detection sensor or the condensing temperature calculate from the condensing pressure becomes a second predetermined value, which is smaller than the first predetermined value, or less.