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Need C-wire for new Honeywell RTH6500WF Thermostat

If you can, run the Brown wire coming from the transformer to the thermostat. That would be your C wire.
Traveler's user avatar
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1 vote
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External (C Wire) Power Supply Use for Cooling Only unit

Question 1: Why can't you use an external 24V PSU to power the thermostat in your cooling-only application? Because, extrapolating a little from the thermostat's documentation, it derives its ...
jay613's user avatar
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Another C-wire for Nest thermostat question

You have two 24 Volt transformers. One for the furnace and one for the zones. You also have 3 zones heating set up. You could borrow a 24 Volt (and C) from one of the transformers to feed the Nest.
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Another C-wire for Nest thermostat question

That's a relatively nice installation. Relative to all the much worse ones. Everything in one place, wired in a logical way. It would be nice if all those cables were labelled! Trace all the cables ...
jay613's user avatar
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Nest Power Connector (C Wire) on A/C unit GMP075-4

where's "C" It's the blue wire in the first picture. It also connects to the equipment ground. via that wire that goes under one of the transformer's mounting screws. There's also a white ...
Jasen's user avatar
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Where do I get a "C" common wire on Utica Boiler UH15B-060K

If you know how a transformer looks, find it. From it you get 24 Volt and the C wire. (Pink and Brown) Brown would be the C wire
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Where can I install a C-Wire for Weil-McLain gas boiler? (EGH 115, 4 Series, Natural gas)

You have 24 Volt as shown in this picture. From here run the24V and the 24V ground (C) to the WiFi thermostat and connect to R and C terminals. This will power your WiFi thermostat. From thermostat ...
Traveler's user avatar
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