化學系各位成員大家好：

4/11中午，嘉麒空調工程有限公司派員至B255室進行故障冷氣之檢修作業。經現場檢視後，廠商判定故障原因為前次填充冷媒時，因當時氣溫較低，冷媒總體積較小，隨著近期氣溫升高，冷媒膨脹導致室外機防凍保護裝置跳脫，進而影響冷氣正常運作。廠商於11:40進行排放作業，釋放室外機內多餘冷媒，排出的冷媒自室外經由未緊閉的窗戶逸散至走道，因此觸發走道之偵煙器。系辦提醒請各單位進行類似工程時，應先隔離偵煙器或關門窗避免煙霧排放至鄰近室內，以免觸發警報。

化學系環安衛小組

Dear all,

At morning on April 11, the technician carried out maintenance on a malfunctioning air conditioning unit of Room B255. After on-site inspection, the technician determined that the cause of the malfunction was related to the previous refrigerant refill. At that time, due to lower ambient temperature, the total volume of refrigerant was smaller. As temperature have recently increased, the refrigerant expanded, triggering the outdoor unit’s anti-freeze protection mechanism and thereby affecting the normal operation of the air conditioner.

At 11:40 AM, the technician carried out a discharge operation to release excess refrigerant from the outdoor unit. The discharged refrigerant escaped through a window that was not fully closed and dispersed into the corridor, which subsequently triggered the smoke detector.

The department office reminds all units that when conducting similar maintenance work, they should first isolate the smoke detectors or close doors and windows to prevent smoke from spreading to adjacent indoor areas and unintentionally triggering the alarm.

EHS-CHEM Team