초록 ▼

A hot water storage tank (3) and a circulating path (12) coupled to the hot water storage tank (3) are provided. An operation is possible wherein low-temperature water, let out from a lower part of the hot water storage tank (3) and entering the circulating path (12), is heated and boiled up by a he

A hot water storage tank (3) and a circulating path (12) coupled to the hot water storage tank (3) are provided. An operation is possible wherein low-temperature water, let out from a lower part of the hot water storage tank (3) and entering the circulating path (12), is heated and boiled up by a heat pump heating source for forwarding to an upper part of the hot water storage tank (3). A refrigerant circulating circuit of the heat pump heating source is provided with a defrost circuit (38) for supplying hot gas from a compressor (25) to an air heat exchanger (28). It is possible to perform a defrost operation for providing a supply of hot gas to the air heat exchanger (28), with a water circulation pump (13) of the circulating path (12) held in abeyance. The water circulation pump (13) is made active if the defrost operation has been continued for not less than a predetermined time period since the start thereof.

대표청구항 ▼

What is claimed is: 1. A heat pump type hot water supply apparatus, comprising:a hot water storage tank;a circulating path coupled to said hot water storage tank;a heat exchanging path inserted in said circulating path;said heat pump type hot water supply apparatus being operable to perform an opera

What is claimed is: 1. A heat pump type hot water supply apparatus, comprising:a hot water storage tank;a circulating path coupled to said hot water storage tank;a heat exchanging path inserted in said circulating path;said heat pump type hot water supply apparatus being operable to perform an operation in which said heat exchanging path is so heated by a heat pump heating source as to boil low-temperature water let out from a lower part of said hot water storage tank for forwarding to an upper part of said hot water storage tank;a refrigerant circulating circuit of said heat pump heating source being formed by a sequential connection of a compressor, a water heat exchanger for heating said low-temperature water, a pressure reducing mechanism, and an air heat exchanger;said refrigerant circulating circuit further comprising a defrost circuit for supplying hot gas from said compressor, to said air heat exchanger;wherein said heat pump type hot water supply apparatus is operable to perform a defrost operation for providing a supply of hot gas to said air heat exchanger, with a water circulation pump of said circulating path held in abeyance;wherein defrost control means is provided which activates said water circulation pump if said defrost operation has been continued for not less than a predetermined time period since the start thereof.