xiv 18.3 Servicing Fan Motors ............................. 405 18.4 Servicing External Motors ..................... 406 18.5 Servicing Motor Control Systems .......... 412 Section 7 Refrigeration System Components Chapter 19 Compressors ...................................................... 418 19.1 Compressor Drive Configurations.......... 419 19.2 Types of Compressors ........................... 422 19.3 General Compressor Components and Systems .......................................... 440 Chapter 20 Compressor Safety Components ............................ 452 20.1 Compressor Operating Conditions ........ 453 20.2 Compressor Protection Devices ............ 454 20.3 Oil Control Systems ............................... 457 20.4 Vibration Absorbers ............................... 461 20.5 Crankcase Heaters ................................ 462 Chapter 21 Metering Devices................................................. 466 21.1 Metering Device Basics ......................... 467 21.2 Capillary Tubes ...................................... 468 21.3 Metering Orifices.................................... 471 21.4 Thermostatic Expansion Valves (TXVs) ........................................ 472 21.5 Automatic Expansion Valves (AXVs) ..... 488 21.6 Electronic Expansion Valves (EEVs) ..... 490 21.7 Float-Operated Refrigerant Controls ..... 495 Chapter 22 Heat Exchangers .................................................. 502 22.1 Evaporators............................................ 503 22.2 Condensers ........................................... 526 22.3 Head Pressure Control .......................... 535 22.4 Other Heat Exchangers ......................... 537 Chapter 23 Refrigerant Flow Components................................ 548 23.1 Refrigerant Loop Components .............. 549 23.2 Storage and Filtration Components ....... 550 23.3 Refrigerant Flow Valves ......................... 554 23.4 Pressure-Regulating Valves .................. 564 23.5 Head Pressure Control Valves ............... 573 Section 8 Domestic Refrigerators and Freezers Chapter 24 Overview of Domestic Refrigerators and Freezers ..... 584 24.1 Basic Components of Refrigerators and Freezers ................ 585 24.2 Specialized Systems .............................. 593 24.3 Domestic Refrigeration .......................... 606 24.4 Refrigerators and Freezers .................... 607 24.5 Connected Refrigerators ....................... 612 Chapter 25 Installation and Troubleshooting of Domestic Refrigerators and Freezers .................. 616 25.1 Checking for Proper Installation ............. 617 25.2 Diagnosing Symptoms ........................... 620 25.3 Checking External Circuits .................... 627 25.4 Diagnosing Internal Troubles ................. 630 Chapter 26 Service and Repair of Domestic Refrigerators and Freezers .................................... 644 26.1 External Service Operations .................. 645 26.2 Internal Service Operations ................... 646 26.3 Storing or Discarding a Refrigerator-Freezer ............................ 656 Section 9 Indoor Air Fundamentals Chapter 27 Air Movement and Measurement ........................... 660 27.1 Climate ................................................... 661 27.2 Atmosphere and Air ............................... 662 27.3 Comfort Conditions ................................ 676 27.4 Air Movement ......................................... 678 27.5 Factors Affecting Indoor Air Conditions ........................................ 687 Chapter 28 Air Quality .......................................................... 692 28.1 Indoor Air Quality Standards and Guidelines ....................................... 693 28.2 Air Pollutants .......................................... 693 28.3 Indoor Air Quality ................................... 697 28.4 Air Cleaning ........................................... 703 28.5 Indoor Air Quality Systems .................... 712