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by sagosto
Fri Apr 13, 2018 10:45 pm
Forum: Help and Advice
Topic: Nest / EWC-ST-2D Controller
Replies: 1
Views: 4070

Nest / EWC-ST-2D Controller

Nest 3rd Gen York A/C H2RA060S06D York Furnace P4HUC20N09201A EWC Zone Controller (EWC-ST-2D) My zone controller requires the dreaded O/B terminals. To power my 1st floor Nest (primary), I moved the "O" terminal from wiring block under "ZONE-1 TSTAT" (3rd from top on right side) ...