xx CHAPTER 26 Service and Repair of Domestic Refrigerators and Freezers ............668 26.1 External Service Operations ..............670 26.2 Internal Service Operations................671 26.3 Storing or Discarding a Refrigerator-Freezer ...........................682 Section 9 Indoor Air Fundamentals CHAPTER 27 Air Movement and Measurement ...686 27.1 Climate ................................................688 27.2 Atmosphere and Air ............................688 27.3 Comfort Conditions .............................702 27.4 Air Movement ......................................705 27.5 Factors Affecting Indoor Air Conditions ....714 CHAPTER 28 Air Quality .......................................718 28.1 Indoor Air Quality Standards and Guidelines ..........................................720 28.2 Air Pollutants ......................................720 28.3 Indoor Air Quality................................724 28.4 Air Cleaning ........................................730 28.5 Indoor Air Quality Systems .................739 CHAPTER 29 Air Distribution...............................744 29.1 Air Properties and Behavior ................ 746 29.2 Air Circulation ..................................... 747 29.3 Basic Ventilation Requirements ......... 748 29.4 Air Ducts .............................................753 29.5 Duct Sizing .........................................768 29.6 Fans ...................................................775 29.7 Air Curtains ........................................781 CHAPTER 30 Ventilation System Service ...........786 30.1 Airflow Measurement ..........................788 30.2 Special Duct Problems and Duct Maintenance ......................................793 30.3 Fan Service ........................................799 30.4 Filter Service ......................................799 Section 10 Air-Conditioning Systems CHAPTER 31 Ductless Air-Conditioning Systems .............................................804 31.1 Principles of Cooling and Humidity Control................................................806 31.2 Room Air Conditioners ........................808 31.3 Packaged Terminal Air Conditioners (PTACs) ..............................................819 31.4 Console Air Conditioners ....................821 31.5 Portable Air Conditioners ....................823 31.6 Multizone Ductless Split System .........825 CHAPTER 32 Residential Central Air-Conditioning Systems ............834 32.1 Central Air Conditioning ......................836 32.2 Split Systems ......................................838 32.3 Comfort Cooling Controls ...................841 32.4 Installing Central Air Conditioning ......843 32.5 Inspecting Central Air-Conditioning Systems .............................................848 32.6 Servicing Central Air-Conditioning Systems .............................................850 32.7 Variable Refrigerant Flow (VRF) Systems .............................................852 CHAPTER 33 Commercial Air-Conditioning Systems .............................................858 33.1 Rooftop and Outdoor Units .................860 33.2 Chillers ...............................................872 33.3 Cooling Towers ...................................884 CHAPTER 34 Absorption and Evaporative Cooling Systems ..............................898 34.1 Absorption Refrigeration Systems ......900 34.2 Absorption Cooling Systems ..............902 34.3 Absorption System Service ................914 34.4 Evaporative Cooling ...........................917