Honeywell RTH9585WF - User Manual
Honeywell RTH9585WF Thermostat – User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
C Wire Addendum
Customer Support
1-855-733-5465
Important!
This thermostat requires a C, or common, wire for power.
If you are replacing an existing thermostat, it might not have a C wire connected to it.
If you don’t see a C wire, try one of these two options to power your new thermostat. Please
contact Customer Support at 1-855-733-5465 for assistance at any time during this process.
Before beginning these steps, turn OFF power to your heating/cooling system.
Option A: Finding the C wire
1 There might be an extra wire pushed into the wall or wrapped
around the wire bundle. Gently pull the wire bundle out of the
wall to check for unused wires.
2 If you have an unused wire, connect that wire to the C terminal
on your new thermostat.
3 Connect the other end of the C wire to the C terminal on your
heating/cooling system (or the zone panel if your home uses
more than one thermostat to control heat and cool). Be sure
the other wire(s) connected to the C terminal stay securely
connected when you re-tighten the C terminal.
Note:
Not all heating/cooling equipment use the C label for the 24 VAC common wire. If your
heating/cooling equipment does not have a C terminal, check the system manual or contact
the manufacturer to find out which terminal is the 24 VAC common.
4 Complete the installation following the steps in the instruction manual or quick start guide.
Option B: Using the G wire
If there is no unused wire in the wall, check the table below to see if you can use the G wire to
power the thermostat. If you can’t use the G wire, contact Customer Support.
Note:
Using the G wire in this manner means you can’t run your system fan continuously. It will
run when the system is heating or cooling.
Heating/Cooling System
Furnace that burns gas or propane
Use G wire
Furnace that burns oil
Call Customer Support at 1-855-733-5465
Heat pump WITHOUT backup (auxiliary) heat
Use G wire
Heat pump WITH backup (auxiliary) heat
Call Customer Support at 1-855-733-5465
Zoned system (more than one thermostat
controlling the heating/cooling system)
Call Zoning Support at 1-800-828-8367
System with a whole-house humidifier,
dehumidifier, or ventilator
Call Customer Support at 1-855-733-5465
M36727
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