C225 - 8 Zone CPU - Install Guide




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

3 x RJ 45 Ports:

These RJ45 ports are used for connecting the CAT 5E cables from the touch screens or the multiplexer

RF antenna:

433Mhz antenna is screwed on here. This is used for communication with wireless sensors CRFS# and Wi-Fi bridges COCB and CL5B

Zone damper ports:

Connect the RJ12 (RJ11 on older systems) cables from the damper motors here. Start at zone 1 and continue to connect the zone cables sequentially into the ports. i.e. 1, 2, 3, 4,

Transformer JST VA connection:

Connect the iZone transformer here. Part number CT24ACE

C225 ID number:

This is the unique ID number for the C225. When paired to the bridge the bridge will adopt this number automatically and it will then be the system ID

C325 or CEXT connection ports:

When used for integrated AC / Zone control an AC module is connected to the C225

This module is a C325#, each different brand of AC unit has its own unique C325# module

CEXT modules can also be connected here to extend the number of zone ports

Supply air temperature sensor port:

The supply air sensor is plugged into the C225 here. The supply air sensor is only needed for systems that have zone temperature controls

Pair button:

The pair button can be used to pair wireless remote controls (C400FOB, C410FOB and CEPC) as well as wireless sensors CRFS# and iZone Wi-Fi bridges (COCB and CL5B)

AC unit connection:

Connect the shielded, 2-core cable from the AC unit to the C225 here. This is a spring-loaded wire terminal



Model numbers


Power supply

24VAC 50Hz

Casing material

Fire retardant ABS plastic

Power connection

iZone transformer CT24ACE

Operating Temperature

Up to 65oC

Communications protocols

Wired CAN Bus

Wireless 433Mhz (iZone proprietary protocol)

Number of zones

0 to 8 (RJ11 or RJ12 connectors)

O/A Dimensions

Height (Without Antenna)   32 mm

Height (With Antenna vertical) 124mm

Width    121 mm

Length  117 mm


200 g


The C225, C325 and CEXT can be installed close to the indoor fan coil unit

If any wireless sensor (CRFS) or wireless bridge (CL5B or COCB) is not within the range of the C225 then additional repeaters (CR) should be added to help relay the signal from the field device to the C225 and the bridge

Do not run the network cables alongside 240 Volt wiring

When installing network cables down wall cavities or chasing network cables into walls, tape up and protect the RJ45 connector to avoid damage to the connectors. Installation damage to cables is not covered under warranty

Always install zones in consecutive ports starting at Zone 1. The C225 and CEXT are marked with the zone port numbers

Do not directly hard wire the CT24ACE into the AC unit’s power supply. This may void the warranty as it will require an electrician in the event that a repair of the iZone power supply is required

Connect Zone Damper Actuators (CZDA) to the zone ports using the RJ12 cables as shown in the Wiring layout diagrams

Connect the Colour Touch Screens (CCTSL or CCTSS) to the iZone Net ports using the RJ45 cables. If you are connecting more than 3 components requiring iZone Net ports to the system you will need to connect a Network Extension Module Kit (CNEMK) to one of the iZone Net ports on the C225 using a short RJ45 cable

If any zone is temperature controlled, connect an in Duct Temperature Sensor (CDTS) to the CDTS port. Install the sensor into the supply air duct upstream of all dampers. Secure the sensor in place by using reinforced aluminium tape

When installing temperature controlled zones ensure the CCTS or sensor for the associated zone is installed in a location that is representative of the temperature in the room / zone . The sensor should be installed at approximately 1600mm above the floor and should not be subject to draughts, direct sunlight or heat from equipment such as computers, TV screens etc. The supply air outlets to this room must not blow conditioned air directly onto the sensors or touch screens

Connect the AC unit control cable to the C225 / C325. See AC unit wiring connection section for details. (This control cable must be a shielded cable and is not normally supplied by iZone)

The building must be fitted with a compatible Wi-Fi modem. Contact iZone for a list of approved and recommended modems

If connecting the iZone system to a Home Automation system use the Ethernet connection on the bridge

Only connect the power supply to the CT24ACE port after all components have been connected

Any existing or new air conditioning units that require modification or additional boards to facilitate the correct operation of the iZone system, it is the responsibility of the installing contractor


There are two ways to initialise the system as follows:

  1. Press the rest button on the bottom or side of the iZone touch screen (depending on screen orientation)

  2. Switch the power to the system off and back on


Please note the information displayed on the screen above is an example only and may appear differently on your screen

System model number installed:

From the parts connected to the system and paired to the system the iZone will automatically determine the system model number

Parts connected and software version:

All parts connected (Wired or wireless) and their associated firmware version numbers will be displayed on the initialisation page

System ID number:

This is the unique system identification number. All parts connected to this system will be addressed with this number

Home button:

Press the home button to return to the main menu

Reset button:

Press the reset button to trigger initialisation.

Current configuration:

Displayed in this section of the screen is a summary of the current configuration of the installed iZone system's options

On the iZone Home App and iZone Naked CEPC:

The system requires a hard re-set which can be done by pressing the reset button on one of the following wired devices:






If non of these devices are installed on your system you will need to cycle the power on the C225 or C150 by removing and replacing the CT24ACE or CT24ACM transformer or by turning the isolator / breaker that powers the iZone system off and back on