Thermostat set up..from 4 wire to 5

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  #1  
Old 11-06-16, 06:21 PM
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Thermostat set up..from 4 wire to 5

Hello group,
I have a honeywell wifi thermostat RTH8580WF and a Luxaire gas furnace LP9C080B12MP12CA. As of right now it only has a 4 wire system from the T-stat to the furnace and it really should have a 5 wire. I want to do the 5 wire so I can turn on the blower motor without the need to have the furnace or AC on.

So my general question is when I add the 5 wire between the tstat and furnace which letter would I need to hook up to to allow the blower to run independent of the furnace or AC?

I've been searching on youtube and other places online but not found a good answer.

Thanks for any help
Joel
 
  #2  
Old 11-06-16, 06:41 PM
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Usually the G terminal controls the fan relay.
 
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Old 11-06-16, 06:57 PM
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Thanks Paul,
As of now there is no wire hooked to the G terminal on the tstat but there is a jumper on the furnace going from G to Y/Y2. when I get the wire run would you assume the jumper would be removed as I would think the jumper is to supply power to the blower when the system is calling for heat or AC?
 
  #4  
Old 11-06-16, 11:34 PM
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You are correct.

When you run your new wire/cable..... connect the G from the stat to G on the control board and remove the Y to G jumper.
 
  #5  
Old 11-07-16, 04:24 AM
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Thanks for the confirmation PJ. You guys saved me $100 service charge. To run and install the wire. 😂
 
 

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