xxii xx Chapter 50: Understanding Heat Loads and System Thermodynamics Using Tables to Determine Service Heat Load ............................................................... 1319 Chapter 51: Commercial Refrigeration Component Selection Selecting Components for a Commercial Refrigeration System ......................................1342 Chapter 52: Installing Commercial Systems Commercial Refrigeration Installations ...........1362 Low-Side Charging Procedure ........................ 1376 High-Side Charging Procedure .......................1378 Starting a Commercial Refrigeration System ............................................................1380 Chapter 53: Troubleshooting Commercial Systems—System Diagnosis Fixing a System with a Frozen Moisture Restriction in the TXV .....................................1397 Low Flushing a Dirty Expansion Valve ...........1397 Replacing a Clogged Inlet Screen ..................1397 Quick Check for Trapped Noncondensables ...1406 P/T Chart Check for Trapped Noncondensables ...........................................1407 Ice Machine Capacity Check .......................... 1419 Chapter 54: Troubleshooting Commercial Systems—Component Diagnosis Identifying Leaking Compressor Valves ..........1433 Crankshaft Seal Leak Detection .....................1435 Determining Head Pressure for an Air-Cooled Condenser ..........................1441 Troubleshooting Outdoor Condensers ............1441 Troubleshooting Outdoor Condenser Louvers ...........................................................1442 Determining Head Pressure for a Water-Cooled Condenser .......................1442 Leak Testing a Water-Cooled Condenser .......1443 Removing Scale Deposits from Water-Cooled Condenser Water Tubes ...........1443 Chapter 55: Servicing Commercial Systems Opening a Refrigerant Circuit for Service .......1458 Removing Open-Drive Compressors ..............1462 Removing Hermetic Compressors ..................1465 Removing a Pressure-Operated Water Valve ...............................................................1471