| 摘要 |
PURPOSE:To restrain a sharp rise in temperatures inside a cold air circulation type open display case to diminish the loss of goods when an electric compressor (a refrigerator) of the showcase is stopped through a contact of a magnetic contactor and cooling operation becomes impossible because of a trouble such as an overheat of the compressor (a thermal circuit breaker is off), an overcurrent (a contact of an overcurrent relay is off), an abnormal rise in pressure of refrigerant (a pressurestat is off) and others. CONSTITUTION:When a refrigerator 4 is in a trouble, a relay 16 and a magnetic contactor 15 as well are de-energized, so that a cold-air circulation fan 13 and an anti-sweat heater 14 are turned off since two contacts of the relay 16 are off and a defrosting heater in defrosting operation (when a contact 11a of the magnetic contactor 15 is on) is turned off because the contact of the magnetic contactor 15 is off. |
