The wiring for a four-port multisplit system runs how many wires to each indoor unit?

In a four-port multisplit HVAC system, each indoor unit typically requires three wires for proper operation. These wires include the power supply wires, which typically consist of a live (hot) wire and a neutral wire, and a third wire for the communication or control signal between the indoor unit and the outdoor unit. This configuration allows the indoor units to receive power and communicate their operational status to the outdoor unit, which is essential for system coordination and efficiency.

The use of three wires is efficient for multicircuit systems like this, as it minimizes complexity while ensuring that each unit can function effectively and respond to controls. Additionally, a three-wire setup helps streamline installation, as running fewer wires simplifies the process in confined spaces.