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Thermostat Wiring Explained - Electrical Online
If you are replacing an old thermostat with a new digital thermostat, the electronics in these units may need yet another wire for a terminal labeled ‘C’. This terminal is for a common connection from the control transformer that will provide steady 24 volt power between terminal ‘R’ and ‘C’ to power the thermostat itself.
Running New Thermostat Wire HVAC Easy Step-by-Step Guide
If you are lucky then you can use the old thermostat wire and attach it to the conductor bundles securely and use the old thermostat wire bundles to pull the new thermostat wire however experience tells me that in most situations this will not be possible because usually when someone was installing the original t-stat they put a couple of staples into it to hold in place most likely before the drywall or plaster was
Thermostat C Wire: Everything you need to know about the
Oct 25, 2014Thermostat wire is just a big spool of bundled, color-coded wires. The “18” refers to the gauge and the “5” refers to how many individual wires are inside the cable. Thermostat wire comes in various weights.  If you have heat and AC, you’ll need 18/5.
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