| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water heating system capable of properly performing operation control for preventing hot water of a hot water circulation passage from freezing, with an outside air temperature sensor included in a heat pump device.SOLUTION: In an operation stop state of an air blower of a heat pump device, a controller determines whether a detection temperature of an outside temperature sensor is higher than an actual temperature; and when the detection result is affirmative, determines whether a temperature obtained by correcting the detection temperature of the outside temperature sensor satisfies a condition B on an outside temperature among freezing prevention conditions (STEP9).SELECTED DRAWING: Figure 2 |
