Purpose

This article provides step-by-step instructions for using the Fujitsu VRF Service Tool, including connection setup, operation monitoring, function setting, and saving system data. The tool is essential for commissioning, diagnosing, and maintaining Fujitsu VRF systems

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Scope

This SOP applies to all Fujitsu General service technicians responsible for VRF system commissioning, fault diagnostics, and configuration.

1. Required Equipment

Before starting, ensure you have:

  • WIBU Key: Required USB dongle for software license activation.

    • Must be inserted before running the software.

    • Keep it in a secure location — replacements are not easily obtainable

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  • Echelon Adaptor: Enables communication between the laptop and VRF system.

    • Connects via USB on one end and two snap terminals for Dekoron cable on the other.

    • Recommended: keep 2–3m of Dekoron cable attached for ease of use on multiple systems

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2. Connection Setup

  1. Connect the WIBU Key and Echelon Adaptor to your laptop.

  2. Attach the Dekoron cable to X1/X2 or Z1/Z2 terminals on the outdoor unit.

  3. Launch the VRF Service Tool using the desktop shortcut

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3. Login

  • Use default credentials:
    User ID: vrfvrf
    Password: vrfvrf

  • Tick the box to save credentials for future sessions

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4. Selecting Work Mode

  • Online Work: Use when connecting to a live VRF system.

  • Offline Work: Use for reviewing previously saved BAK files.

  • Enter a project name (e.g., “Her Majesty’s Theatre”) and click OK

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5. USB Port Configuration

  1. Open USB Checker.

  2. Select the correct USB port (e.g., USB3).

  3. Press Light — the SVC light on the adaptor will blink to confirm connection

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6. Address and Network Scanning

  • Select the Refrigerant System Number (Ref. No.) range to match the system address.

  • If unsure, select All to scan the entire network.

  • Use Checked Address to confirm all active addresses are visible on the circuit

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7. System Overview

Once scanning is complete:

  • The system overview displays all connected outdoor, indoor, and RB units.

  • Missing units indicate potential wiring or addressing issues

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8. Detailed Monitoring

Select the Detail Tab to view comprehensive system data:

  • Thermistor temperatures (°C)

  • EXV valve pulses

  • Solenoid operations

  • Compressor speeds (rps)

  • Fan speeds (rpm)

  • High/low pressures (MPa)

  • Saturation temperatures (°C)

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9. Controlling Unit Operation

  • Click the Operation Control icon to open control options.

  • Only one refrigerant system can be commanded at a time.

  • Choose desired operating mode, temperature, and fan speed.

  • Press SEND to apply.

  • Enable R.C Prohibit to prevent end users from turning units off during diagnostics

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10. Operational Confirmation

  • Operating systems display green shading in the interface.

  • Verify correct and efficient system operation.

  • Before disconnecting:

    • Turn all units OFF

    • Remove R.C Prohibit

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11. Indoor Unit Function Settings

Function settings can be changed remotely:

  1. Right-click the Service Tool icon → select Maintenance → Remote Setting.

  2. From the dropdown, choose the function to modify.

  3. Input the new value and click SET.

  4. Press WRITE to send the update to the indoor units

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12. System Time Synchronization

To synchronize all wall controller clocks:

  1. Select Maintenance → System Time Setting.

  2. The current PC date/time will auto-populate.

  3. Click OK to broadcast time to all connected controllers.

  4. Ensure memory backup is enabled to retain time during power interruptions

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13. Saving the BAK File

After completing commissioning or servicing:

  1. Select Save Export File when prompted.

  2. Save to a clearly named project folder (e.g., “SiteName_Date”).

  3. The file (.BAK) must be archived with commissioning reports for future reference.

  4. The Service Tool will automatically close after saving

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14. Troubleshooting Tips

  • Ensure WIBU Key and Echelon adaptor are detected by the laptop.

  • If no devices appear in scan results, check:

    • Communication wiring continuity (X1/X2, Z1/Z2)

    • System address setup

    • Adaptor port assignment

  • Use Checked Address to confirm proper unit addressing.