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The type BP is a fully automatic unit supplying a continuous flow of dry air or gas. It requires very little maintenance, except for occasional lubrication. The Type BP Lectrodryer runs on an eight-hour NEMA cycle with four hours on adsorption, three hours on heating, and one hour on cooling. The reactivation circuit is designed for 100% reactivation of the desiccant under any operating conditions to complete saturation of the desiccant bed. During periods of light loading, the reactivation heating will be terminated as soon as the bed has been reactivated. The one-hour cooling period assures that the desiccant bed will be cooled down before switching to the drying service, eliminating both the high temperature and possible unacceptable dewpoint for a period of time at switchover.