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Aug 15, 2018 at 2:33 comment added Shamtam In case it's of any use: C = Common wire (used for electrical COM for thermostats requiring a 24VAC power source), Rc = +24V for cooling circuit (often bridged with Rh), Rh = +24V for heating circuit, Y# = Cooling (# indicates the zone, if more than one), W# = Heating, G = Fan
Aug 14, 2018 at 19:44 vote accept Jason
Aug 14, 2018 at 19:44 history answered Jason CC BY-SA 4.0