Methods for manufacturing refrigerating systems

In a method of manufacturing for a refrigerating system a wall structure which includes an intermediate insulating body having outer faces and a pair of outer metal skins which respectively have inner faces for respectively engaging said outer faces so that each outer face and an inner face engaging the same forms a pair of faces, the step of forming in said outer faces of said intermediate insulating body grooves of a given depth having a configuration matching that of coils to be received in said grooves, then performing in a given sequence the steps of applying an adhesive to at least one of each of said pair of faces and introducing evaporator and condenser coils into said grooves of said insulating body respectively at said outer faces thereof for directly engaging the metal skins, then, after performing said steps in said predetermined sequence applying the skins to the assembly of the insulating body and coils, and situating the assembled insulating body, coils, and skins in an evacuated atmosphere for eliminating any air bubbles in the adhesive while tightly pressing the metal skins against the insulating body and coils, said insulating body being compressible to a limited degree, and including the step of making said grooves initially of a lesser depth than that required to seat said coils in said grooves flush with said outer faces of said insulating body, and pressing said skins against the insulating body in said evacuated atmosphere with a force sufficient to compress the insulating body to increase the depth of said grooves while said coils become fully seated therein and said metal skins are pressed flush against said outer faces of said insulating body.