How do I determine if I need a C connection (wire)? null

The easiest way is to go online and use the assistant. (It’s in the instructions) It will allow you to input your wires and tell you exactly where to place them as well as whether or not the thermostat is compatible with your system. If it is. It will tell which wires you can omit (if any) it makes things pretty fool proof. Hope this helps

If you are talking about the spade terminals (looks like a C), no you can't use it for the Nest thermostat unless you use a terminal block in between them both. It's just easier to cut the spade terminals off and use the bare wire. If it's not the solid copper wires but the stranded wires, it's still possible to use the stranded wires but make sure you do a clean cut. The connectors are push button connections on the Nest thermostat and need bare wires to fit into the holes.

You need a C wire to use this unit. Take the existing thermostat off the wall and check to see if there is a C wire connected to the existing unit. It should be labeled.

Check compatibility on the Nest website.

Come on son, before you purchase anything these days, visit the manufacturer's website and view the installation video or pdf.

“How do I determine if I need a C connection (wire)?”

Asked by Oakie 7 years ago

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The easiest way is to go online and use the assistant. (It’s in the instructions) It will allow you to input your wires and tell you exactly where to place them as well as whether or not the thermostat is compatible with your system. If it is. It will tell which wires you can omit (if any) it makes things pretty fool proof. Hope this helps
Answered by Ironjiant 7 years ago
Sorry, there was a problem. Please try again later.
If you are talking about the spade terminals (looks like a C), no you can't use it for the Nest thermostat unless you use a terminal block in between them both. It's just easier to cut the spade terminals off and use the bare wire. If it's not the solid copper wires but the stranded wires, it's still possible to use the stranded wires but make sure you do a clean cut. The connectors are push button connections on the Nest thermostat and need bare wires to fit into the holes.
Answered by Will 7 years ago
Sorry, there was a problem. Please try again later.
You need a C wire to use this unit. Take the existing thermostat off the wall and check to see if there is a C wire connected to the existing unit. It should be labeled.
Answered by MrSunshine 7 years ago
Sorry, there was a problem. Please try again later.
Check compatibility on the Nest website.
Answered by Buuurp 7 years ago
Sorry, there was a problem. Please try again later.
Come on son, before you purchase anything these days, visit the manufacturer's website and view the installation video or pdf.
Answered by vwilk 7 years ago
Sorry, there was a problem. Please try again later.