Safety control device for vapor generating and recovering apparatus

In a vapor generating and recovering apparatus for vaporizing a liquid and condensing vapor, including a housing having at least one compartment therein, said compartment having a liquid and a vapor therein, and a heating and cooling system to vaporize the liquid and condense the vapor, said system including a refrigerant compressor, a refrigerant condenser, expansion means, a refrigerant evaporator in heat exchange relation with the vapor, and conduit means in flow communication with said condenser, said expansion means, and said evaporator, said system further including a heat transfer fluid therein, the improvement comprising:

• a sensing means on the low pressure side of the heating and cooling system in de-activating communication with means that create an unsafe vapor level condition in the apparatus, said sensing means being responsive to de-activate said refrigerant compressor in response to preselected conditions of said cooling means which create said unsafe vapor level.