Adding New External 24v Transformer to Nest with separate Rh and Rc wires

Asked Jan 23 '22 at 23:51

Active Nov 02 '22 at 15:53

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I have separate heat and cooling systems with wiring to Y, W, G, Rh and Rc (see below). For the external transformer, where do I attach the two wires. C and ?

edited Jan 24 '22 at 19:24

FreeMan

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asked Jan 23 '22 at 23:51

Richard

Adding New External 24v Transformer to Nest with separate Rh and Rc wires

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