Abstract
This present paper describes the development of the optimum control system of heat source apparatus. This system has developped the purpose of maintaining high-efficiency performance of heat source about annual running. The characteristifc of this developped is controling of some apparatuss in system, keeping their condition under control organicaly. This once, we applied the system to a heat source system consisting of absorption refrigerator. The validity found in practical making use of the system is shown.