Table of Contents
1. General Outline of Appliance
1-1 Features ..........................................................................................................................................1
1-2 Specifications .................................................................................................................................2
1-3 Performance ...................................................................................................................................3
1-4 General Construction (Parts Names) .............................................................................................4
1-5 Main Component Structures ...........................................................................................................5
1-6 Main Safety Devices .......................................................................................................................9
1-7 Scale Build Up Alarm....................................................................................................................10
2. Installation and Related Work
2-1 INSTALLATION INSTRUCTIONS .................................................................................................11
2-2 DIMENSIONS ...............................................................................................................................16
2-3 SUGGESTED PIPING-BASIC INSTALLATION ............................................................................17
2-4 SUGGESTED PIPING-CIRCULATION SYSTEMS .......................................................................18
2-5 VENT PIPE INSTALLATION .........................................................................................................19
2-6 GAS LINE SIZING CHARTS ........................................................................................................20
2-7 GAS PIPING .................................................................................................................................21
2-8 WATER PIPING ............................................................................................................................21
2-9 PRESSURE RELIEF VALVE ........................................................................................................22
2-10 ELECTRICAL CONNECTION ......................................................................................................22
2-11 WIRING DIAGRAM .......................................................................................................................24
2-12 DIAGNOSTIC POINTS .................................................................................................................26
2-13 SCHEMATIC DIAGRAM ...............................................................................................................27
2-14 WIRING REMOTE CONTROLLER...............................................................................................28
2-15 MAIN REMOTE CONTROLLER CMR-2250 (P/N 3748) ..............................................................29
2-16 BATH REMOTE CONTROLLER YST-2250 (P/N 3749) ................................................................30
2-17 TESTING OPERATION ................................................................................................................31
3. Service and Maintenance
3-1 Operation Principles .....................................................................................................................32
3-2 Time Charts ..................................................................................................................................33
3-3 Flow Charts ..................................................................................................................................35
3-4 Fault Findings and Error Code......................................................................................................36
3-5 Gas Setting Procedure .................................................................................................................39
3-6 Combustion Specification, Various Combination Setting ..............................................................40
3-7 Remote Controllers Special Features ...........................................................................................42
3-8 Disassembling/Assembling Parts .................................................................................................44
3-9 Procedure for Flushing Water Heater ...........................................................................................53
3-10 Exploded View ..............................................................................................................................56
3-11 Parts List.......................................................................................................................................57
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