Help installing a Honeywell RTH9580WF Thermostat

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Old 12-19-15, 09:42 PM
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Post Help installing a Honeywell RTH9580WF Thermostat

Hi, I just purchased a Honeywell RTH9580WF Thermostat and I need help installing it to my GMP100-4 REV B Furnace. The wiring on my original Thermostat is a bit different to what the new one uses.

Original Thermostat
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Furnace Wearing Diagram
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Honeywell RTH9580WF Thermostat
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Please help!
 
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Old 12-19-15, 09:55 PM
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Welcome to the forums.

You are showing four wires between the stat and the furnace. You are going to need five wires as the stat requires a C connection. Are there any spares in the cable ?
 
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Old 12-19-15, 10:32 PM
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There is a spare cable that's not connected.
 
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Old 12-19-15, 10:42 PM
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red --------> R (leave jumper plug in place)
black ------> W-O/B
yellow ----> Y
green -----> G
???? ------> C (a screw into metal at the furnace)
 
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Old 12-20-15, 07:19 AM
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Ok thank you. I will be hooking it up today so ill post when its up and running :-)
 
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Old 12-20-15, 12:16 PM
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24 volt common is the blue pigtail wire sticking out of the furnace with many Goodman units.
 
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