Summary

Use this article to download the VRF Refrigerant Charge Calculation Sheet, complete the required fields, and return it for processing. The sheet standardises how additional charge is calculated for IV-series VRF systems and helps prevent commissioning delays due to incomplete information.

Applies to

  • Models/Series:

    • S Series HPCO

    • S Series HR

    • V Series

    • J Series

    • JIIS Series

    • JII Series

    • JIII Series

    • JIIIL Series

    • JIV Series

    • JIVS Series

    • JIVL Series

    • VII Series

    • VIII Series

    • VRII Series

    • VRIV Series

  • New installations, extensions, and major pipework alterations requiring a verified refrigerant charge calculation

What you need before you start

Have these details on hand so you can complete the sheet in one pass:

  • Site name, project reference, installer/contact details

  • Outdoor unit model(s) and quantity

  • Indoor unit model(s) and quantity

  • Piping layout summary (main run, branches, and risers)

  • Pipe sizes for liquid/gas lines

  • Measured line lengths by section (horizontal and vertical)

  • Highest vertical separation between indoor and outdoor units

  • Factory charge per outdoor unit (from nameplate or data sheet)

  • Commissioning date target and any special notes (e.g., long riser, oil traps)

How to complete the sheet (step-by-step)

1) Project & contact details

  • Enter site name, project number/reference, company, installer name, email, and phone.

  • Add the required return date if this is time-critical.

2) Equipment schedule

  • List each outdoor unit model and quantity.

  • List each indoor unit model and quantity.

  • If the sheet has a dedicated schedule tab, ensure counts reconcile with the piping tab totals.

3) Piping data

  • Record pipe sizes for liquid and gas lines on every section (main trunk and each branch).

  • Enter measured lengths for each section. Separate horizontal and vertical where requested.

  • Note max height difference (outdoor above/below indoors).

  • Identify any riser sections and long horizontal runs that may require special attention.

4) Factory charge & rules

  • Input the factory refrigerant charge for each outdoor model from the nameplate or spec.

  • If the sheet includes built-in rules (e.g., charge per metre by pipe size), verify the units and increments match the project specification.

5) Review calculated results

  • Confirm the additional charge output is non-negative and aligns with expectations for your lengths and sizes.

  • Check any validation flags or conditional formatting. Resolve highlighted cells.

6) Attach drawings (recommended)

  • Include a simplified pipe schematic or marked-up plan showing lengths and sizes that correspond to what you entered.

7) Save and return

  • Save the file with a clear name (e.g., ProjectName_VRF_ChargeCalc.xlsx).

  • Attach and send to your Fujitsu contact or the nominated email address for processing.

Quality checks before you submit

  • Totals of indoor units match the schedule and the piping schematic

  • Pipe sizes are realistic and consistent along branches

  • Longest run and highest riser are clearly identified

  • Factory charge values entered for every outdoor unit type present

  • Contact information and project reference completed