6-Zone Nite CPU
Part number: C155
Overview
The C155 is the CPU that is included in the Nite Zone Control Kit (C210K) — an open/close-only zone control system with no zone temperature sensor support. The CPU cupports up to 6 zones and is operated by the Nite Wall Controller (CLCSW). There is no port for an induct temperature sensor (CDTS). A Smart Hub (COCBH) can be paired to the Nite CPU to allow a user to control the system with a mobile device.
Installation Guides
Refer to the Nite Zone Control Kit installation guide.
- Install the C155 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.
- 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 front of the C155 is marked with the zone port numbers
- Do not directly hard wire the CT24ACM into the AC unit's power supply. This may void the warranty as it will require an electrician in the event that repair of the iZone system is required
- Connect zone damper actuators to the zone ports using the RJ12 cables as shown
- Connect the AC unit control cable to the C150 as per the instructions for your brand of AC unit
- Only connect the power supply to the CT24ACM port after all components have been connected
User Guides
Refer to the Nite Zone Control Kit user guide.
Troubleshooting
No known issues have been documented for this product at this time.
Specifications
| Specification | Description |
|---|---|
| Power supply | 24VAC 50Hz (CT24ACM) |
| Casing material | Fire retardant ABS plastic |
| Operating temperature | Up to 65⁰C |
| Communications | Wireless 433Mhz (iZone proprietary protocol) |
| Number of zones | 0 to 6 (RJ12 connectors) |
| Dimensions | 32H x 119W x 100L mm Height 124mm with antenna vertical |
| Weight | 150g |
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.
C155 3.79 - May 2026
- Added support for Rinnai/Midea HA/HB connection
C155 3.69 - Dec 2024
- Added Mitsi Electric 4th fan speed
- Fixed iZone/Midea/York AC comms status in Nova controller
- Fixed climate control mode issue
- Added support for Hisense
- Enabled temperature control for the constant zone
- Fixed sensor status monitor to display signal strength for "RF Sensor"
- Added support for the new Gree unit (G3)
- Resolved an issue where the constant zone was not selecting the AC unit for temperature control
- Updated sleep timer functionality to reset the remaining time to 0 when the sleep timer is stopped
C155 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