Watts AERCO SmartPlate SP23 - Page 91

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SmartPlate Installation, Operation & Maintenance Manual

CHAPTER 8 – CORRECTIVE MAINTENANCE

OMM-0069_0H • SP-100 • 1/30/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 91 of 134

STEP-DOWN TRANSFORMER REPLACEMENT Instructions

Figure 8-30. ECS/SP Control Box Assembly 69096 (Sheet 1 of 2)

Main Page

Table of Contents2
General Information5
Introduction5
Electronic Control System/Smartplate (Ecs/Sp)6
- Control Box Assembly7
- Feed-Forward Temperature Sensors8
- Outlet Temperature Sensors8
- Boiler Water Inlet/Outlet Temperature Sensors8
Electronic Control Valve, Mxg-4619
- Installation11
Smartplate Piping Assemblies9
Introduction11
Receiving and Unpacking Smartplate11
Site Selection and Preparation12
- Installation Clearances12
- Setting the Unit13
- Repositioning ECS/SP Control Box14
Heating Fluid and Domestic Hot Water (Dhw) Piping15
Smartplate Electrical Wiring Connections16
Additional Component Installation21
- Functional Description23
Introduction23
Mechanical Overview23
Electronic Control Overview24
Over-Temperature Control and Safety Features24
- Adjustment27
Introduction27
Smartplate 3-Way Control Valve, Mxg-461 Adjustment27
- Control Valve Calibration and Status Indications27
- Manual Control of 3-Way Valve - Removable Handwheel to Hamper Tampering30
- Setpoint Temperature Adjustment31
- Over-Temperature Alarm Limit Adjustment34
  - Operation37
Introduction37
Pre-Operational Checks & Procedures37
Initial Start-Up38
Checking Mixed Inlet Temperature39
Shutting down the System39
- Scheduled Maintenance41
Introduction41
Boiler Water Differential Pressure Gauge Check42
Over-Temp Switch Check43
Plate Pack Leakage Checks (Double-Wall Models Only)43
Control Valve Operational Check44
Strainer Inspection and Cleaning44
Temperature Sensor Checks44
Recirculation Pump Check45
Periodic Cleaning of Heat Exchanger46
- Troubleshooting47
Introduction47
Troubleshooting Procedures47
- Corrective Maintenance57
Heat Exchanger Cleaning & De-Scaling57
Introduction57
Single Wall Heat Exchanger Maintenance57
Single-Wall Heat Exchanger Replacement60
Double-Wall Heat Exchanger Maintenance63
Double-Wall Heat Exchanger Cleaning64
- Heat Exchanger Cleaning and De-Scaling (In-Place Method)64
- Heat Exchanger Cleaning by Disassembly64
Double-Wall Heat Exchanger Opening and Closing66
- Opening Heat Exchanger67
- Removal and Insertion of Plates69
- Closing Heat Exchanger70
Double-Wall Heat Exchanger Gasket Replacement73
- Replacing Gaskets on Channel Plates73
- Replacing Gaskets on End Plate (First Plate against Frame Plate)74
Double-Wall Heat Exchanger Replacement76
Control Valve Electronic Module Replacement and Valve Removal80
- Electronics Module Replacement80
- Control Valve Replacement82
Recirculation Pump Replacement83
Strainers85
Control Box Assembly Replacement87
Ecs/Sp Control Box Assembly and Components87
Temperature Controller Replacement88
Over-Temperature Switch and Temperature Indicators89
Vac Step-Down Transformer Replacement90
- Appendix A105
- Appendix B - Ecs/Sp Wiring Diagram & Terminal Block Connections105
- Appendix C - Smart Plate Piping Drawings107
- Appendix D - Dimensional Drawings119
- Appendix E - Part Lists121
- Appendix F - Recommended Spare Parts131

Watts AERCO SmartPlate SP23 - Page 91

Table of Contents

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