payne furnace - GC wire terminal? - http://www.hvacmechanic.com/ Forums
Original message
| g20zoom
 |  "payne furnace - GC wire terminal?"
, posted Mon 16 Jun 20:07  
My heater works in Heat switch position. If the cool-off-heat is in the off, and the left switch on my Honeywell thermostat that says on-off-auto is set to ON, the fan does NOT go on.
Both heater and thermostat are about 20 years old.
If the thermostat 'G' terminal is connected to the blue wire, should inside the furnace, the blue wire be connected to the GC terminal to get the fan to work?
Seem like GC for green cool to the G terminal would do the trick, but i better double check!
Thanks!
-Joe
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Replies:
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| theduke03
| "Re(1):payne furnace - GC wire terminal?" , posted Mon 16 Jun 20:38
Sounds like it's working properly to me. The stat uses RC to energize G with a call for fan. RC circuit is open when system selector switch is in the OFF or Heat position. If you haven't jumpered those wires yet don't do it or you'll be buying a new transformer.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | g20zoom
| "Re(2):payne furnace - GC wire terminal?" , posted Mon 16 Jun 20:57
Let me reclarify...I only have a furnace and that works fine in the heat position. However, the fan only does not work. the G is hooked up in the stat, but what terminal should I connect that to in the furnace? The wire is not connected in the furnace.
Now i've read GH and that I need to be careful if the fan cooling speed is different then fan heat. I'm confused...what wire to connect?
I want to change out the thermostat next...so i want to get things right before moving on.
-joe
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| | theduke03
| "Re(3):payne furnace - GC wire terminal?" , posted Mon 16 Jun 21:07
I would expect a G terminal to attach it to. Not sure about GC but whatever the diagram says. There should be a wiring diagram on the inside of furnace door that will show where G from the stat should be connected.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | wondering
| "Re(4):payne furnace - GC wire terminal?" , posted Mon 16 Jun 22:35
Just guessing again -- old Bryants ran with a GC for cooling and a GH for humidifier hook up. Get the unit running heat with the fan on and see what voltage you have at GH & C. Don't have any old wiring diagrams handy.
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| | Houston204
| "Re(5):payne furnace - GC wire terminal?" , posted Mon 16 Jun 23:22
Green connects to GC.
I keep a few diagrams around.
"Tip of the Day" Remember to remove power first.
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| | g20zoom
| "Re(6):payne furnace - GC wire terminal?" , posted Thu 19 Jun 16:12
thanks everyone.
Now do I have to be concerned if the heat mode fan speed is different than the cooling mode fan speed?
Something like if it's in heat mode, and the fan switches to the cooling speed? I read somewhere this could be damaging.
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| | Houston204
| "Re(7):payne furnace - GC wire terminal?" , posted Sat 21 Jun 01:52
Your board can control fan speeds safely. You can turn the FAN ON in heat mode, and it will isolate low speed and switch to high speed without mishap.
This problem would only arise if you tried to build your own fan control with relays and didn't isolate properly.
"Tip of the Day" Remember to remove power first.
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