To prevent pitting corrosion of a gas cooler for hot water supply and a gas cooler for heating by a water refrigerant, in a hot water supply heating system having the gas cooler for hot water supply and the gas cooler for heating in one heat pump circuit.
In a normal operation performing heating and hot water supply, heat is supplied to a secondary refrigerant for hot water supply from the gas coolers 7, 8 for hot water supply while decompressing a primary refrigerant by an electric valve 10a, and heat is supplied to a secondary refrigerant for heating by the gas cooler 9 for heating. When an operation is performed only for heating, the second gas cooler 8 for hot water supply is functioned as an evaporator by decompression by an electric valve 10b, and giving and receiving of heat energy are canceled out by the first gas cooler 7 for hot water supply and the second gas cooler 8 for hot water supply. When an operation is performed only for hot water supply, a low stage compressor 5 is bypassed by a bypass passage 14, an intercooler 13 is functioned as an evaporator, and giving and receiving of heat energy are canceled out by the gas cooler 9 for heating and the intercooler 13.
FUJIMOTO SHUJI
YOSHIMI ATSUSHI
YAMADA TAKUO
YAMAGUCHI TAKAHIRO
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