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Mitsubishi Heavy Industries

Module used to integrate with a Mitsubishi Heavy Industries AC unit. The iZone AC unit module (C325#) connects to the CPU module (C225) to enable communication with a ducted AC unit.

AC Series​

Compatibility​

SeriesIndoor UnitOutdoor UnitAC Unit module
FDU SeriesC325MHI2
FDUA SeriesC325MHI2
FDUM SeriesC325MHI2
KX SeriesC325MHI2
FDC SeriesFDC100VNP-WC325MHI2
Three Phase UnitsFDUA200VGC325MHI2
Three Phase UnitsFDUA200VHC325MHI2
Three Phase UnitsFDUA200VFC325MHI2
Three Phase UnitsFDU280KXZE1C325MHI2

Connection​

  • Polarity is not critical.
  • Take the Remote Controller (X/Y) control wire from the fan coil unit and connect it to the AC Unit Control Cable on the C225 / C325MHI2.

mhi xy wiring

Notes​

  • Master/Slave options are not available on iZone systems for MHI units.
  • Both OEM and iZone controllers cannot be wired into the indoor FCU board simultaneously.
  • Please be advised you may need to increase the static pressure when installing MHI with iZONE.

Static Pressure Setup​

  1. Before installing iZone:
  2. Connect the MHI controller first.
  3. Enter the password on the MHI controller:
    • 9999
  4. Navigate to:
    • Installation Setup
    • Static Pressure
  5. Factory settings are typically between 80 Pa and 100 Pa.
  6. This setting may cause:
    • Outdoor unit not to fully cycle.
    • Coil not to operate correctly.
  7. Adjust static pressure to 160 Pa.
  8. Run the unit for 5 minutes.
  9. Disconnect the controller and install iZone.

Firmware and Updates​

C325MHI2​

C325MHI2 2.5 - May 2024​

  • First release

C325MHI3​

C325MHI3 1.0 - Jul 2026​

  • Initial Release - Added VRF control support.