Nova Mini CAT connection kit
Part number: C536K
Description
Nova Mini climate control kit using a CAT5 connection between the CSL Screen Link Module and the 7″ Nova Mini wall controller. Includes COCBH Smart Hub for iZone Home app connectivity.
Installation guide
🧭ONLINE GUIDENova Mini Installer Training→▶VIDEOGeneral installation videoVIDEO→▶VIDEOPairing wireless temperature sensorsVIDEO→📐WIRING DIAGRAMC536K wiring diagramWIRING→
Specifications
| Entry | Description |
|---|---|
| CPU | C225 |
| Power supply | 24VAC 50Hz via CT24ACE |
| Wall controller | CCASSWE — 7″ Nova Mini touch screen (CAT5) |
| Number of zones | 0 to 8 (expandable to 14 with CEXT) |
Included in
| Part number | Description |
|---|---|
| C225 | 8-zone CPU |
| CT24ACE | 24VAC power supply |
| CSL | Screen Link Module |
| C325# | AC unit interface module — brand specific |
| COCBH | Smart Hub |
| CCASSWE | Nova Mini wall controller — 7″ touch screen (CAT5) |
| CDTS | In-duct temperature sensor (required if using zone temperature sensors) |
Related parts
Documents
Troubleshoot guide
Read more
Nova wall controller screen is blank or unresponsive
The Nova or Nova Mini touch screen fails to power on or goes black.
Steps to resolve:
- Check the power supply (CTDC12) connection to the Nova wall controller
- Check the Cat5e cable between the CSL Screen Link Module and the Nova — try a different port on the CSL
- Re-pair the CSL to the C225 CPU if the connection has been lost
- Replace the cable if the issue persists
- If still unresolved, contact your installer — the CSL or C225 CPU may need to be replaced
Zones are not opening or responding
One or more zones are unresponsive when commanded from the Nova wall controller.
Steps to resolve:
- Move the zone motor cable to a different port on the C225
- In the Nova app, go to Setup → Configure AC → Options → Skip Zone Port (password:
wamfud) and skip the faulty port - Verify the CT24ACE transformer is powered and outputting ~24VAC
- Check all wiring connections are fully seated
Note: On Daikin systems, it can take up to two minutes for dampers to open after a command is sent.
Nova controller not communicating with C225 CPU
The Nova wall controller shows no connection to the system.
Steps to resolve:
- Confirm the COCBH Smart Hub is powered and the Nova shows the Wi-Fi symbol
- Re-pair the CSL to the C225 if pairing has been lost
- Ensure the Smart Hub was not connected to the internet modem before commissioning was completed — if it was, disconnect it, factory reset the COCBH, and recommission the system
- Add a repeater (CR) if the Smart Hub is out of range of the C225
Temperature sensor not showing actual temperature
A zone shows no temperature reading despite having a sensor fitted.
Steps to resolve:
- Press the button on the sensor — if no lights appear, the battery needs replacing (CR2032)
- If the sensor flashes instead of showing solid red or blue, it needs re-pairing: press and hold the pair button, then pair through Menu → Devices in the iZone app
- Ensure the CDTS in-duct sensor is installed upstream of all dampers in the supply air duct
- Check the sensor is not obstructed by furniture or exposed to direct sunlight
Firmware history
No firmware history — this part contains no embedded software.