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Installing your thermostat
Important!
The Wi-Fi thermostat requires a C wire to operate. The C, or common, wire
brings 24 VAC power to the thermostat. Many older mechanical or battery operated
thermostats do not require a C wire. If you don't have a C wire, try:
• Looking for an unused wire that is pushed into the wall. Connect that wire to C
and check that it is connected to the 24 VAC common at your heating/cooling
system.
Note:
Not all heating/cooling systems label the 24 VAC common C. Check your
system manual or contact the manufacturer to find out which terminal is the 24 VAC
common.
View the Alternate Wiring videos at honeywellhome.com/wifi-thermostat
Wiring
For
conventional
conditioner), see page 14. See "Glossary" on page 64 for further definition.
For a
heat pump
definition.
heating/cooling systems (natural gas, oil or electric furnace, air
system, see page 15. See "Glossary" on page 64 for further
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