...
Set this DIP switch (SW1) into the UP position
...
1️⃣ iZone C225 module: Ensure the correct C325 module is connected for the AC unit make it is controlling
2️⃣ Y2 / Y3: Connect the Y2 / Y3 cable from the Fujitsu FCU to iZone CPU. Polarity is critical
3️⃣ Shielded cable: Shielded, 2 core, twisted pair cable must be used and is not supplied by iZone
...