To beforehand prevent a dangerous state caused by the leakage of refrigerant by providing the control means of the refrigerating means with a monitoring means that detects the malfunction of the refrigerating means such as refrigerators installed in hotel rooms comprising a refrigerator compartment that can be sealed and a refrigerating circuit comprising an absorption circuit.

An expeller 1 is heated by an electric heating tube 3 and a gas heating tube 4, ammonia vapor discharged from a pump tube 2 is conducted to a condenser 5 and condensed there. Liquid ammonia is injected to a serpentine form tube evaporator 9 through a tube 7 and evaporated. The ammonia discharged from the evaporator 9 is absorbed by ammonia solution inside a reserve 15 and an absorber 12 and a condensed mixture of the ammonia and hydrogen is conducted upward. A temperature sensor 19 to detect the temperature of the evaporator 9 of the refrigerating means is provided and the heating means of the expeller 1 is switched off when the detected value of the temperature exceeds the reference value.