Table of Contents
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HYDROBOX
SERVICE MANUAL
[Model Name]
EHSD-MED
EHSD-VM2D
EHSD-VM6D
EHSD-YM9D
EHSD-YM9ED
EHSD-TM9D
ERSD-MED
ERSD-VM2D
ERSD-VM6D
ERSD-YM9D
[Service Ref.]
Refer to page 2.
HYDROBOX
EHSC-MED
EHSC-VM2D
EHSC-VM6D
EHSC-YM9D
EHSC-YM9ED
EHSC-TM9D
ERSC-MED
ERSC-VM2D
ERSC-VM6D
ERSC-YM9D
EHSE-MED
EHSE-YM9ED
ERSE-MED
ERSE-YM9ED
EHPX-VM2D
EHPX-VM6D
EHPX-YM9D
EHPX-MED
EHPX-YM9ED
ERPX-MD
ERPX-VM2D
ERPX-VM6D
ERPX-YM9D
CONTENTS
1. REFERENCE MANUAL ................................... 3
2. SAFETY PRECAUTION ................................... 4
3. SPECIFICATIONS ............................................ 6
4. PART NAMES AND FUNCTIONS .................. 8
5. OUTLINES AND DIMENSIONS ....................... 9
6. WIRING DIAGRAM ......................................... 11
7. FIELD WIRING ............................................... 17
8. WATER SYSTEM DIAGRAM ......................... 19
9. CONTROLS ................................................... 22
10. TROUBLESHOOTING ................................... 43
11. DISASSEMBLY PROCEDURE ...................... 60
12. SUPPLEMENTARY INFORMATION ............. 80
13. SERVICE AND MAINTENANCE ................... 81
PARTS CATALOG (OCB712)
October 2020
No. OCH712
REVISED EDITION-C
Revision:
• ERSD-VM6D, ERSD-
YM9D, ERSC-VM6D,
ERSC-YM9D and
ERPX series have been
added.
• Some descriptions
have been modified in
REVISED EDITION-C.
OCH712B is void.
Note:
• This manual describes
service data of
Hydrobox only.
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Table of Contents
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Summarization of Contents
REFERENCE MANUAL
Outdoor Unit Service Manual References
Lists service manual numbers for various outdoor units, categorized by type.
SAFETY PRECAUTIONS
Symbols, Warnings, and Cautions
Explains warning symbols, cautions, and general safety guidelines.
Service and Refrigerant Handling Cautions
Cautions for service personnel, refrigerant handling, and necessary tools.
SPECIFICATIONS
Unit Specifications Overview
Details physical, electrical, and operational specifications for various models.
PART NAMES AND FUNCTIONS
Component Identification for System Models
Illustrates and identifies key parts for packaged and split model systems.
OUTLINES AND DIMENSIONS
Technical Drawings and Connection Details
Provides dimensional drawings and connection information for system models.
WIRING DIAGRAMS
Model-Specific Wiring Schematics
Detailed wiring diagrams for different unit series and models.
DIP Switch Settings and Functions
Explains the function of DIP switches for system setup and customization.
FIELD WIRING
Power Supply and Connection Options
Illustrates wiring for hydrobox powered via outdoor unit or independent source.
WATER SYSTEM DIAGRAMS
System Flow and Configuration Layouts
Shows water system diagrams for different model types and local configurations.
CONTROLS
Main Remote Controller Operation and Settings
Details the main remote controller's interface, functions, and settings menus.
Service Menu Operations and Diagnostics
Outlines access and functions within the service menu for advanced settings and diagnostics.
TROUBLESHOOTING
Malfunction Diagnosis and Error Codes
Guides on identifying and resolving issues using check codes and error histories.
Component Function Checks and Testing
Provides methods for checking the function of key components like pumps and sensors.
DISASSEMBLY PROCEDURE
Component Removal and Replacement Steps
Step-by-step instructions for disassembling various parts of the hydrobox unit.
SUPPLEMENTARY INFORMATION
Boiler Back-up and Multi-Unit Control
Information on boiler backup, multi-unit control, and system setup.
SERVICE AND MAINTENANCE
Annual Maintenance and Log Book Procedures
Details annual maintenance tasks, part inspections, and record keeping.
Engineers Forms and Settings Records
Forms for recording commissioning and field settings for engineers.
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