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8 Zone CPU Module

Part number: C225

Description​

The C225 module provides the main processor and communication for zone control and integrated iZone control. C225

Specifications​

EntryDescription
Model numbersC225
Power supply24VAC 50Hz
Casing materialFire retardant ABS plastic
Power connectioniZone transformer CT24ACE
Operating TemperatureUp to 65oC
Communications protocolsWired CAN Bus Wireless 433Mhz (iZone proprietary protocol)
Number of zones0 to 8 (RJ11 or RJ12 connectors)
O/A DimensionsHeight (Without Antenna) 32 mm
Height (With Antenna vertical) 124mm
Width 121mm
Length 117 mm
Weight200 g

Installation guide​

Nova CAT5 (C546K) installation guide
Nova Mini CAT5 (C536K) installation guide

Nova wireless (C545K) installation guide
Nova Mini wireless (C535K) installation guide

Nexus+ (C430+K) installation guide
Nano (C420K) installation guide

User manual​

Nova user manual
Nexus+ user manual Nano user manual

Troubleshoot guide​

One or more zones are not responding​

  • No 24VAC supply
  • Incorrect wiring
  • Verify power supply output
  • Check wiring polarity and connectors

Wall control panel or screen is not coming on​

If the screen fails to power on, goes black, or shows no signs of life, two potential causes can be considered.

  • The first is a potential cable issue, either due to a fault or damage.
  • The second possibility is an issue related to component "c225."

Possible Solution To address this, begin by attempting to change the screen's port on the CPU to "c225." Plug it into an alternative iZone Net port on the CPU and check if the problem persists. If the issue remains unresolved, consider replacing the cable that connects the CPU to the wall control panel, as this may be a source of the problem.

If the problem still persists please contact your installer to change CPU 225 for your system.

Zone Extender (CEXT)
AC unit module (C325#)
Screen link module (CSL)
AC Transformer (CT24ACE)

Firmware version history​

Details

C225 3.77 - Jan 2026​

  • 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 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 - 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).