| 摘要 |
PURPOSE:To prevent an excessive decrease in temperature within a freezer by a method wherein as any one of fans within the freezer shows an abnormal state, a temperature of a parameter of capability control is changed over from a detected value of a blowing temperature sensor becoming unstable due to a disturbance o air to another detected value of a suction temperature sensor reduced by a short circuit of next blowing air. CONSTITUTION:As any one of fans F1-1 to F2-4 within a freezer shows an abnormal state during a refrigeration mode and an abnormal signal is outputted from a photo-coupler, a capability control parameter is changed over from a blowing air temperature to a sucking air temperature. With this control, an input signal changing-over means is constructed. Accordingly, during a refrigeration mode of the freezer device, a degree of opening of an electrical expansion valve EV1, is adjusted in such a manner that a blowing air temperature detected by a blowing air temperature sensor is converged into a control target value by a capability control means and then a temperature within the freezer is controlled by the capability control of the freezer to become a proper value. With such an arrangement, it is possible to prevent an excessive decreasing of the temperature within the freezer. |
