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by lilysmith10
Mon Aug 10, 2026 7:06 am
Forum: Help and Advice
Topic: Upgrading from ST-2E to NCM-3z
Replies: 2
Views: 39980

Re: Upgrading from ST-2E to NCM-3z

I’d mainly verify that the existing zone dampers and their actuators are compatible with the NCM-3z, and that the furnace/AC control wiring and transformer can handle the new controller and smart thermostats before making the swap.