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Daikin

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

Ducted AC units​

Compatibility​

SeriesIndoorOutdoorAC Unit module
PREMIUM INVERTER SINGLE PHASEFDYA71AV19
FDYA85AV19
FDYA100AV19
FDYA125AV19
FDYA140AV19
FDYA160AV19
FDYA180AV1		RZAS71C2V1
RZAS85C2V1
RZAS100C2V1
RZAS125C2V1
RZAS140C2V1
RZAS160C2V1
RZAS180DV1		C325D2
PREMIUM INVERTER THREE PHASEFDYA180AV1
FDYA200AV1
FDYQ250LCV1
FDYQ180LCV1
FDYQ200LCV1
FDYQ250LCV1		RZAS180DY1
RZAS200DY1
RZYQ10TY1
RZYQ7TA2Y1
RZYQ8TAY1
RZYQ10TAY1		C325D2
INVERTER SINGLE PHASEFDYAN50AV1
FDYAN60AV1
FDYAN71AV1
FDYAN85AV1
FDYAN100AV1
FDYAN125AV1
FDYAN140AV1
FDYAN160AV1		RZA50C2V1
RZA60C2V1
RZA71C2V1
RZA85C2V1
RZA100C2V1
RZA125C2V1
RZA140C2V1
RZA160C2V1		C325D2
INVERTER THREE PHASEFDYAN71AV1
FDYAN85AV1
FDYAN100AV1
FDYAN125AV1
FDYAN140AV1
FDYAN160AV1
FDYQN180LCV1
FDYQN200LCV1
FDYQN250LBV1		RZA71C2Y1
RZA85C2Y1
RZA100C2Y1
RZA125C2Y1
RZA140C2Y1
RZA160C2Y1
RZQ180M2Y1
RZQ200MY1
RZQ250LY1		C325D2
FBA SLIMLINE SINGLE PHASEFBA50BAVMA
FBA60BAVMA
FBA71BVMA
FBA85BVMA
FBA100BVMA
FBA125BVMA
FBA140BVMA
FBA71BVMA
FBA85BVMA		RZAV50C2V1
RZAV60C2V1
RZAV71C2V1
RZAV85C2V1
RZAV100F2V1
RZAV125F2V1
RZAV140F2V1
RZAC71C2V1
RZAC85C2V1		C325D2
FBA SLIMLINE THREE PHASEFBA71BVMA
FBA85BVMA
FBA100BVMA
FBA125BVMA
FBA140BVMA
FBA85BVMA		RZAV71C2Y1
RZAV85C2Y1
RZAV100F2Y1
RZAV125F2Y1
RZAV140F2Y1
RZAC85C2Y1		C325D2
FDYBA BULKHEAD SINGLE PHASEFDYBA25AV1
FDYBA35AV1
FDYBA50AV1
FDYBA60AV1
FDYBA71AV1		RZAC25G2V1
RZAC35G2V1
RZAC50G2V1
RZAC60G2V1
RZAC71G2V1		C325D2

Connection​

  • Polarity is not critical
  • Connect iZone Unit Control Cable port to the P1 and P2 terminals in the Daikin FCU.
  • Shielded cable: Shielded, 2 core, twisted pair cable must be used and is not supplied by iZone
DAIKIN PCB

DAIKIN PCB
DAIKIN Wiring
DAIKIN Wiring

Notes​

  1. For 20 kW and above, make sure you have the Daikin controller onsite, connect it to the unit and carry out a test run first, confirm the unit running before connecting and wiring iZone system to the unit.
  2. Daikin Error Codes Search WEB
  3. Daikin Ducted Systems Brochure PDF

For VRV Systems​

Compatibility​

SeriesIndoorOutdoorAC Unit module
Ducted (High Sensible)FXMQ###-PAVEC325D2

Connection​

  • Polarity is not critical
  • Connect iZone Unit Control Cable port to the P1 and P2 terminals in the Daikin FCU.
  • Shielded cable: Shielded, 2 core, twisted pair cable must be used and is not supplied by iZone

See Wiring diagram VRV systems for further infomation.

Notes​

  1. Daikin Wall Controller (BRC) support:
    1. Set Daikin controller to SUB mode -
      • Remove iZone controller from the P1/ P2 connection
      • Connect the Daikin controller
      • Go to Service Setting (hold bottom right button) → Switch Main Sub Controller
      • Select Sub RC
    2. Connect iZone controller from the P1/ P2 connection. Polarity is not critical.
    3. Connect Daikin controller P2/P1 -> P1/P2 connections. Polarity critical when connected with C225.
      • If controller is reading “Checking the connection. Please stand by.”
      • Try switching the P1/P2 connections.

Firmware and Updates​

C325D2 1.9 - Mar 2026​

  • Fixed an issue where static pressure messages were processed even when static pressure control was not supported by the Daikin unit.

C325D2 1.7 - Jan 2026​

  • Updated static pressure setting to support 15 selectable levels (require C225, v3.76, CVRFH 1.2, CCTSL 2.36, COCBH 4.34, NOVA 1.21 or greater)
  • Add ability to use Daikin BRC controller and iZone controller at the same time (require C225 3.76, CVRFH 1.2, NOVA 1.21 or greater)
  • Improved handling of MSG3A and MSG3B communication messages

C325D2 1.4 - Dec 2024​

  • Added support for VRF control (require C225 v3.69, CVRFH: v1.0, COCBH v4.29, NOVA 1.09)

C325D2 1.3 - Mar 2024​

  • Fix issue when AC connected and working but status is no comms

C325D2 1.2 - Nov 2022​

  • Improved message detection
  • Get more temperature information from the AC unit