METHOD AND MEANS CONTROLLING DEFROST CYCLES OF A COOLING UNIT

摘要

M-6650 METHOD AND MEANS CONTROLLING DEFROST CYCLES OF A COOLING UNIT The time between constant speed defrost cycles is shortened by monitoring the opening and closing of a door of a cooling unit. The control system for doing so includes cam means rotating at a constant speed and electrical switches responsive thereto, a ratchet with missing teeth coupled to the cam means, a pawl engaging the door and the ratchet.