| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump heat source system capable of stably controlling heat release from a heating terminal while restraining decrease in efficiency of a heat pump unit during heating operation.SOLUTION: A heat pump heat source system includes: an on/off duty determination section 151 which determines on/off duty as a ratio of an on-period where hot water is circulated through a low-temperature heating path 112 to an off-period where the hot water is stopped from circulating through the low-temperature heating path 112 in a predetermined control period in response to a difference between a room temperature and a heating preset temperature; and a heating control section 152 which executes heating operation of a floor heater 200 by circulating the hot water through the low-temperature heating path 112 and stopping the hot water from circulating through a tank circulating path 41 during the on-period, and by stopping the hot water from circulating through the low-temperature heating path 112 and circulating the hot water through the tank circulating path 41 during the off-period with a heat pump 51 maintained in operating condition according to the on/off duty. |
