AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 4)

HE-111
− CONTENTS
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CHAPTER 6 SCHEDULED MAINTENANCE
6.1 INTRODUCTION .............................................................................................. 6-1
6.2 WEEKLY MAINTENANCE ............................................................................. 6-1
6.3 MONTHLY MAINTENANCE .......................................................................... 6-1
6.4 QUARTERLY MAINTENANCE ...................................................................... 6-2
6.4.1 First Three Months .................................................................................................... 6-2
6.4.2 Each Quarter .............................................................................................................. 6-2
6.5 SEMI-ANNUAL MAINTENANCE .................................................................. 6-3
6.6 ANNUAL MAINTENANCE ............................................................................. 6-3
CHAPTER 7 TROUBLESHOOTING
7.1 INTRODUCTION .............................................................................................. 7-1
7.2 TROUBLESHOOTING PROCEDURES ........................................................... 7-1
CHAPTER 8 CORRECTIVE MAINTENANCE
8.1 INTRODUCTION .................................................................................................8.1
8.2 CXT-E ELECTRONIC CONTROL VALVE ...................................................... 8-1
8.2.1 Valve Shaft Seal Retainer Replacement .................................................................... 8-7
8.2.2 Valve Disassembly .................................................................................................... 8-8
8.2.3 Valve Reassembly ................................................................................................... 8-11
8.2.4 Actuator Replacement ............................................................................................. 8-13
8.2.5 Linkage Assembly Replacement ............................................................................. 8-15
8.2.6 Recirculation Pump Replacement ............................................................................ 8-16
8.3 ELECTRONIC CONTROL SYSTEM ............................................................. 8-18
8.3.1 Replacing the Control Box Assembly ..................................................................... 8-18
8.3.2 Replacing the Temperature Controller .................................................................... 8-19
8.3.3 Replacing the Over-temperature Switch and Temperature Indicator ...................... 8-20
8.3.4 Replacing the DC Power Supply ............................................................................. 8-21
8.3.5 Replacing the DC Voltage Regulator ...................................................................... 8-21
8.4 RECOMMENDED SPARE PARTS ................................................................ 8-27
CHAPTER 9 DISASSEMBLY AND REASSEMBLY
9.1 INTRODUCTION 9-1
9.1.2 Tools Required .......................................................................................................... 9-1
9.2 CHECKING FOR A TUBING LEAK ............................................................... 9-1
9.3 REMOVING THE HEAT EXCHANGER SHELL ........................................... 9-1
9.4 REASSEMBLING THE HEAT EXCHANGER ................................................ 9-3
APPENDIX
A. CONTROL AND COMMUNICATION
A.1 TEMPERATURE CONTROLLER PROCEDURES ............................. A-2
A.2 MODBUS COMMUNICATION INFORMATION ............................... A-7
A.3 PROCESS AND DIAGNOSTIC ALARMS ........................................... A-8
B. WIRING DIAGRAMS