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The purpose of this document is to help the users to understand how the instrumentation of air-conditioning system works. There are various types of instrumentation systems such as electric, electronic and direct digital control (DDC) systems, which can be used to control the air handling unit (AHU). This document includes a number of examples with the emphasis placed on electronic and electrical instrumentation. The Appropriate method must be selected after studying the various conditions such as how the system will be used, likely operating conditions, degree of control accuracy required, consistency of all facilities, etc. Contact the Yamatake representatives for further information on actual instrumentation and design.
