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In Heat of Compression Type Air Dryers, directly from Air compressor discharge is taken to Air dryer inlet through insulated pipelines, at 120^o C (minimum) temperature. This hot air is passed through one drying vessel where saturated desiccant is regenerated by this hot air. After picking up moisture from desiccant bed, the air is cooled in an intermediate cooler. Here moisture is condensed and removed by auto drain valve. Cooled to 40^o C, this air passes through the second drying vessel where balance moisture gets adsorbed and Dry air comes out. Cycle time is 4 hours regeneration & 4 hours drying. After 4 hours the changeover of vessels takes place automatically. In regeneration cycle heating of the bed is only 2 hours, and thereafter the bed is cooled by Dry air. After bed cooling, Dry air is again cooled to 40^o C in another cooler, and delivered out of unit as Dry air at 40^o C temp. The Dryer is fully automatic with pneumatically actuated Ball/ plug valves. A sequence timer controls operation of these valves. Desiccant used is Activated Alumina and it dries the air up to (-) 40^o C Dew point.