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- Sat Apr 03, 2021 10:13 pm
- Forum: Help and Advice
- Topic: ST-2D to NCM-300 upgrade
- Replies: 2
- Views: 1044
]Hi, I have replaced my EWC-ST-2D panel with an NCM-300 and followed the upgrade wiring instructions. I wired the NCM-300 exactly the same as the ST-2D on the system block (see attachements). I have a gas-fired furnace and external AC unit with 2 zones. The reason for the upgrade is to be able to in...