xxv Chapter 26: Service and Repair of Domestic Refrigerators and Freezers Preparing a Domestic Refrigerator or Freezer for Internal Service .........................................671 Removing a Hermetic Compressor ....................672 Installing a Replacement Compressor ................673 Repairing a Stainless Steel Evaporator ..............675 Repairing an Aluminum Evaporator ....................675 Replacing a Filter-Drier .......................................677 Testing a Thermostat ..........................................681 Chapter 28: Air Quality Cleaning an Ultraviolet Air Treatment System .....738 Chapter 29: Air Distribution Riveting a Joint Using a Pop Rivet Tool ..............760 Using Mastic to Seal a Duct Joint .......................760 Installing Insulation into Square Ductwork..........761 Duct Sizing Procedure ........................................769 Sizing Ducts Using the Friction Chart .................773 Chapter 30: Ventilation System Service Performing a Blower Door Test ...........................790 Cleaning Ductwork .............................................796 Balancing a System—Long Method ...................797 Balancing a System—Short Method ...................797 Washing an Electronic Air Cleaner Filter ............800 Chapter 36: Thermostats Troubleshooting a Heating System with a Low-Voltage Thermostat .................................965 Diagnosing a High Current Draw on a Transformer ....................................................966 Diagnostics Using a Line-Voltage Thermostat ....967 Troubleshooting a Zoned System ....................... 974 Chapter 39: Hydronic Heating Fundamentals Purging a Series Loop System .........................1067 Purging a One-Pipe System with Primary and Secondary Loops .........................................1067 Purging a Two-Pipe Zoned System with Zone Circulating Pumps ........................................1069 Purging a Two-Pipe Zoned System with Zone Valves ...........................................................1070 Purging a Hydronic System Filled with Glycol Solution ........................................................1070 Recharging a Horizontal Expansion Tank .........1073 Recharging a Diaphragm Expansion Tank .......1073 Boiler Inspection and Maintenance .................. 1074 Chapter 41: Gas-Fired Heating Systems Heat Exchanger Leak Test Procedure .............. 1138 Chapter 42: Oil-Fired Heating Systems Stack Temperature Test Procedure ................... 1154 Draft Test Procedure ......................................... 1155 Smoke Test Procedure ...................................... 1157 Manually Bleeding an Oil Furnace .................... 1181 Chapter 43: Electric Heating Systems Testing Heating Elements ................................. 1213 Replacing Baseboard Heating Units ................. 1213 Chapter 45: Energy Management Troubleshooting a Building Ethernet/IP Communication Fault ....................................1257 Troubleshooting a Controller and Cable Loss of Signal .......................................................1257 Troubleshooting to Component Level ...............1257 Troubleshooting an Electrical Failure ................1257 Chapter 50: Understanding Heat Loads and System Thermodynamics Using Tables to Determine Service Heat Load ....1359 Chapter 51: Commercial Refrigeration Component Selection Selecting Components for a Commercial Refrigeration System ....................................1380 Chapter 52: Installing Commercial Systems Commercial Refrigeration Installations .............1400 Low-Side Charging Procedure .......................... 1415 High-Side Charging Procedure ......................... 1417 Starting a Commercial Refrigeration System .... 1419 Chapter 53: Troubleshooting Commercial Systems—System Diagnosis Fixing a System with a Frozen Moisture Restriction in the TXV .....................................................1436 Flushing a Dirty Expansion Valve .....................1436 Replacing a Clogged Inlet Screen ....................1437 Quick Check for Trapped Noncondensables .....1444 P/T Chart Check for Trapped Noncondensables ...1445 Ice Machine Capacity Check ............................1458 Chapter 54: Troubleshooting Commercial Systems—Component Diagnosis Identifying Leaking Compressor Valves ............1472 Crankshaft Seal Leak Detection .......................1473 Determining Head Pressure for an Air-Cooled Condenser ....................................................1479 Troubleshooting Outdoor Condensers ...............1480 Troubleshooting Outdoor Condenser Louvers....1481 Determining Head Pressure for a Water-Cooled Condenser ....................................................1481 Leak Testing a Water-Cooled Condenser .........1481 Removing Scale Deposits from Water-Cooled Condenser Water Tubes ...............................1482 Chapter 55: Servicing Commercial Systems Opening a Refrigerant Circuit for Service .........1498 Removing Open-Drive Compressors ................1502 Removing Hermetic Compressors ....................1505 Removing a Pressure-Operated Water Valve .... 1511