Multiple AC units

There are various configuration options to control multiple ducted AC units from a single wall controller. The following diagrams illustrate the wiring required for these configurations, each showing three ducted AC units connected to a primary wall controller, with an optional secondary wall controller.

Nexus wall controller

Each ducted AC unit is each connected to its own CPU Module (C225), which provides the communication link between each indoor unit and the wall controller. The CPU Modules (C225) are then all wired back to a central Net Mutiplexer (CISM) that manages communication between the multiple AC units and the control interface. The Multiplexer connects to a Nexus+ wall controller (CCTSLW+), allowing a single touchscreen to control and monitor all three systems, with an additional optional wall controller shown for secondary access.

Each Multiplexer is powered seperately with a 24VAC power supply (CT24ACE). The Multiplexer can display up to 5 indoor units and a maximum of 3 Nexus wall controllers can be connected.

Nova DC wall controller

Every Smart Hub (COCBH) is connected to a CPU Module (C225) on a one-to-one basis, meaning one hub is required for each CPU module. The Smart Hub communictes with the CPU Module via an iZone proprietary radio frequency (RF) protocol. Each Smart Hub connects to the local Wi-Fi network via a router, enabling network communication across all systems.

The Nova DC wall controller (CCASLW) then connects to the same Wi-Fi network and automatically discovers all Smart Hubs present, displaying each connected system on the home screen for selection and control. Additional Nova DC wall controllers can be added to the network (up to six in total), allowing multiple control points for the connected AC systems.

Nova CAT wall controller

A Screen Link Multiplexer (CSLM) is used when connecting one or more Nova CAT wall controllers (CCASLWE) to a Screen Link Module (CSL), providing a centralised communication interface between multiple ducted AC systems and the wall controllers. The Multiplexer manages data distribution across connected systems, enabling coordinated control and system selection from a single interface.

Each Multiplexer requires a dedicated 24VAC power supply (CT24ACE) for operation. A single Multiplexer supports up to four indoor units, with a maximum of two Nova CAT wall controllers connected per CSLM.