6.9 PERIODIC CLEANING OF HEAT EXCHANGER ...................................................................................... 46
TROUBLESHOOTING ......................................................................................47
7.1 INTRODUCTION ................................................................................................................................. 47
7.2 TROUBLESHOOTING PROCEDURES ................................................................................................... 47
CORRECTIVE MAINTENANCE ........................................................................57
8.1 INTRODUCTION ................................................................................................................................. 57
8.2 SINGLE WALL HEAT EXCHANGER MAINTENANCE ............................................................................. 57
8.3 HEAT EXCHANGER CLEANING & DE-SCALING ................................................................................... 57
8.4 SINGLE-WALL HEAT EXCHANGER REPLACEMENT ............................................................................. 60
8.5 DOUBLE-WALL HEAT EXCHANGER MAINTENANCE ........................................................................... 63
8.6 DOUBLE-WALL HEAT EXCHANGER CLEANING ................................................................................... 64
8.6.1 Heat Exchanger Cleaning and De-Scaling (In-Place Method) ..................................................... 64
8.6.2 Heat Exchanger Cleaning By Disassembly .................................................................................. 64
8.7 DOUBLE-WALL HEAT EXCHANGER OPENING AND CLOSING ............................................................. 66
8.7.1 OPENING HEAT EXCHANGER ...................................................................................................... 67
8.7.2 REMOVAL AND INSERTION OF PLATES ....................................................................................... 69
8.7.3 CLOSING HEAT EXCHANGER ....................................................................................................... 70
8.8 DOUBLE-WALL HEAT EXCHANGER GASKET REPLACEMENT .............................................................. 73
8.8.1 Replacing Gaskets on Channel Plates ......................................................................................... 73
8.8.2 Replacing Gaskets on End Plate (First Plate Against Frame Plate) ............................................. 74
8.9 DOUBLE-WALL HEAT EXCHANGER REPLACEMENT ........................................................................... 76
8.10 CONTROL VALVE ELECTRONIC MODULE REPLACEMENT AND VALVE REMOVAL ........................... 80
8.10.1 Electronics Module Replacement ............................................................................................. 80
8.10.2 Control Valve Replacement ...................................................................................................... 82
8.11 RECIRCULATION PUMP REPLACEMENT ........................................................................................... 83
8.12 STRAINERS ....................................................................................................................................... 85
8.13 ECS/SP CONTROL BOX ASSEMBLY AND COMPONENTS .................................................................. 87
8.14 CONTROL BOX ASSEMBLY REPLACEMENT ...................................................................................... 87
8.15 TEMPERATURE CONTROLLER REPLACEMENT ................................................................................. 88
8.16 OVER-TEMPERATURE SWITCH AND TEMPERATURE INDICATORS .................................................. 89
8.17 24 VAC STEP-DOWN TRANSFORMER REPLACEMENT ..................................................................... 90
APPENDIX A .................................................................................................................................. 95
APPENDIX B – ECS/SP WIRING DIAGRAM & TERMINAL BLOCK CONNECTIONS ........................ 105
APPENDIX C – SMART PLATE PIPING DRAWINGS ....................................................................... 107
APPENDIX D – DIMENSIONAL DRAWINGS.................................................................................. 119
APPENDIX E – PART LISTS ........................................................................................................... 121
APPENDIX F – RECOMMENDED SPARE PARTS ........................................................................... 131
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