| 摘要 |
In this heat pump system, a refrigeration cycle 9 is filled with HFO refrigerant, the refrigeration cycle (9) is provided with, between an ejection pipe (8A) of a compressor (2) and an intake pipe (8B), a hot-gas bypass circuit (11) that bypasses a portion of hot-gas refrigerant toward the intake pipe (8B) and that is provided with a control valve (10), and a controller (12) has a function for, when starting heating, opening the control valve (10) when a pressure in a low-pressure section is detected to be equal to or less than a set pressure or when a condition for making the pressure equal to or less than the set pressure is detected and a function for closing the control valve (10) when the pressure in the low-pressure section is detected to have stabilized at a pressure equal to or greater than the set pressure. |
