Install new Honeywell Thermostat (C wire issue)

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Old 01-26-14, 10:54 AM
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Install new Honeywell Thermostat (C wire issue)

I am looking to upgrade my current thermostat to a new Honeywell wifi thermostat (Model # RTH6580WF). My current thermostat has 4 wires:

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As you can see I do not have the C wire required for the newer thermostat. I am able to run a new wire to use as the C wire with no problem, but I am unsure of where to connect it in the terminal block in the outside unit. I have 2 C terminals but both are in use as you can see in the following pic:

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Also, I was able to find the wiring diagram for my model (Rheem RRKA Series):

http://www.rheem.com/documents/rrka-...ication-sheets (Page 27)

Any help would be greatly appreciated. I tried to include as much info as possible but please let me know if I need to post any additional pics or info/ Thanks.
 
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Old 01-26-14, 11:00 AM
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Welcome to the forums.

In that unit..... the common is also connected to the metal case. You can use the screw right next to the two C terminals to connect to.
 
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Old 01-26-14, 02:40 PM
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Pulled a new wire, attached to that common ground and its working like a charm. Thanks so much!
 
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