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SUBCOURSE OD1750 EDITION A REFRIGERATIONANDAIR CONDITIONINGIV (EQUIPMENTCOOLING) REFRIGERATION AND AIRCONDITIONING IV (EQUIPMENT COOLING) Subcourse OD1750 Edition A United States ArmyCombined Arms Support Command FortLee, VA23801-1809 14 Credit Hours INTRODUCTION This subcourse is the last of four subcourses devoted to basic instruction in refrigeration and air conditioning. The scope of this subcourse takes in unit components of the absorption system, including their functions and maintenance; water treatment methods and their relationship to centrifugal systems; centrifugal water pumps and electronic control systems, including the relationship of amplifier, bridge and discriminator circuits to electronic controls. The subcourse consists of three lessons. Lesson 1. Direct Expansion and Absorption System. 2. Centrifugal Systems and Water Treatment. 3. Centrifugal Water Pumps and Electronic Control Systems. Unless otherwise stated, whenever the masculine gender is used, both men and women are included. CONTENTS Page Preface.................................................................................................................................................................... ii Acknowledgment.................................................................................................................................................... iii Lesson 1 Chapter 1 Direct Expansion Systems ..................................................................................................................................... 1 2 Absorption Systems ............................................................................................................................................... 26 Lesson 2 Chapter 3 Centrifugal Systems ............................................................................................................................................... 46 4 Water Treatment ................................................................................................................................................... 77 Lesson 3 Chapter 5 Centrifugal Water Pumps)...................................................................................................................................... 96 6 Fundamentals of Electronic Controls..................................................................................................................... 103 7 Electronic Control Systems ................................................................................................................................... 132 Answers to Review Exercises................................................................................................................................. 139 The passing score for ACCP material is 70%. Preface YOU HAVE studied the fundamentals and commercial refrigeration and air-conditioning systems. This final volume deals with another phase of your career ladder-equipment cooling. Since the principles of equipment cooling are common to all refrigeration systems, your mastery of the subject should be easy. All of the systems covered in this volume can be applied to commercial refrigeration and air conditioning. To qualify you in equipment cooling, we will present the following systems in this volume: (1) Direct expansion (2) Absorption (3) Centrifugal (4) Water treatment (5) Centrifugal water pumps (6) Fundamentals of electronic controls (7) Electronic control Keep this memorandum for your own use. ii ... - tailieumienphi.vn
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