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8-zone CPU module

Part number: C225

Overview​

The CPU Module (C225) is the main processing unit for iZone climate control systems. It handles zone control logic, communicates with AC unit interface modules (C325#), wall controllers, wireless sensors and the Smart Hub. Supports up to 8 zones natively, expandable to 14 with a Zone Extender Module (CEXT).

C225

Installation Guides​

Install the C225 close to the ducted AC indoor unit, usually on top of the fan coil unit. Make sure the antenna is tighten and pointing vertically upwards.

User Guides​

Troubleshooting​

  1. Zones are not opening or responding

Specifications​

SpecificationDescription
Power supply24VAC 50Hz
Casing materialFire retardant ABS plastic
Operating temperatureUp to 65⁰C
CommunicationsWired CAN Bus
Wireless 433Mhz (iZone proprietary protocol)
Number of zones0 to 8 (RJ11/RJ12 connectors)
Dimensions32H x 121W x 117L mm
Height 124mm with antenna vertical
Weight200g

Firmware and Updates​

C225 3.82 - Jul 2026​

  • Enable full range of ME fault codes
  • Fix Zone group bug
  • Added support for Navi controller
  • Support MHI louvre control
  • Slow down zone dampers when overheat protection is enabled
  • Fix negative return air temperature bug
  • Press and hold PAIR button to reset to factory defaults.
  • Added a check to confirm whether a sensor type is selected for a constant zone with climate control
  • Allowed zones to remain unchanged when setting up favourites or schedules.

C225 3.80 - May 2026​

  • Fix to Zone Group bug preventing C225 to startup

C225 3.79 - Apr 2026​

  • Added support for Rinnai/Midea HA/HB connection

C225 3.77 - Jan 2026​

  • Braemar Dominator integrationp
  • Added TCL ducted AC integration (IRD-211)
  • Fixed Brivis reset command and quick on/off issue (IRD-854)
  • Resolved VRF wired communication issue between C225 and COCB
  • Added feature that will turn AC on when activating a zone. Enable setting ‘AC On with Zone’
  • Add support for Nova wired controllers with CAT5 connection
  • Add ability to change the static pressure of a Daikin system from an iZone wall controller
  • Added zone grouping to combine multiple zones under one name, making it easier to manage large areas
  • Added fan speed control when the setpoint is reached for better comfort and efficiency - Daikin Only
  • Enabled selection and adjustment of static pressure for supported Daikin units - Daikin Only

C225 3.73 - Sep 2025​

  • Overheat protection (default off): Automatically opens or closes zones when temperatures go outside safe limits.
  • Brivis Integration: Seamless integration with Brivis gas ducted heater using C325BV module.
  • Favourite Driven Set Point & Power Control
    • Store both set point and ON/OFF state in favourites.
    • Auto ON when activating any climate/open zone favourite; Auto OFF with a close all favourites.
  • Unit auto ON/OFF on Zone Change: New toggle to automatically turn on AC when zones switch from CLIMATE or OPEN.
  • VRF Mitsubishi Electric (ME) support: Integrate with ME VRF systems using a VRF host module (CVRFH) module.
  • Remote Firmware Upgrade: Implement the ability to upgrade firmware versions remotely without replacing physical hardware (C225 and COCBH only).
  • Bug Fixes & Refinements
    • Added configurable timer delay before zones revert to schedules after a Brivis event.
    • Expanded sensor source options (return air, master, or RF sensor).

C225 3.70 - May 2025​

  • Applies VRF default settings during updates performed via PK5/PK4

C225 3.69 - Dec 2024​

  • Added Mitsi Electric 4th fan speed
  • Fixed iZone/Midea/York AC comms status in Nova controller
  • Added support for Hisense
  • Introduced temperature control for the constant zone
  • Added VRF (Variable Refrigerant Flow) functionality

C225 3.66 - Jul 2024​

  • Fix schedule over midnight
  • Fix return air reading in Nova when no temperature control is present
  • Change time to ‘auto turn off AC system’ from 60s to 3s
  • Fix Brivis 6-fan speed in auto mode
  • Add ‘add-on cooler’ option to the Brivis system
  • Added sleep timer count down

C225 3.65 - Jun 2024​

  • Hot water system release (IRD-189)
  • Brivis system release (IRD-385)
  • Forward system reset message before resetting itself
  • Send zone 11 setpoint to COCB
  • Change structure of AC unit control firmware for the future VRF system

C225 3.64 - Mar 2024​

  • Hot water system initial update
  • Add humidity to zones
  • Send damper positions to COCBH
  • Only slow down dampers when bypass is used
  • Added Haier AC unit control

C225 3.63 - Jul 2023​

  • Fix AC unit connection bug (CTZ type boards)
  • Added Gree AC unit
  • Added Haier and MHI to slow damper strategy

C225 3.59 - Jan 2023​

  • Fixed advanced constant control with fan auto disabled