Thermostat wiring and Ac Blower


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Old 06-22-18, 02:07 PM
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Thermostat wiring and Ac Blower

Hi all

I need help with two issues. First Iím unsure how to wire a new Honeywell 9000 thermostat. I included pictures of my system to better explain. I wired the red and white coming from the two T terminals on the electronic box to R and W on thermostat which is what it says to do. The yellow from Ac compressor to Y and C from transformers to C on thermostat. Where does the blue R wire from transformer go if there is a wire already on thermostat R.

The two wire cable red and white on right side of transformer goes to compressor.

The other problem is blower fan turns on with heater but wonít turn on with AC after compressor turns on.

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Last edited by PJmax; 06-22-18 at 04:02 PM. Reason: enlarged pics/labeled one
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Old 06-22-18, 02:23 PM
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I forgot to mention that the system was originally wired for a simple round manual thermostat.
 
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Old 06-22-18, 03:24 PM
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How was the old thermostat wired?
Most likely the blue R needs to go to Rc on the new thermostat. Then remove the red R thermostat jumper.

Strange that I don't see a wire on G for fan? You can more the white and yellow currently on the Y screw to the G screw on the transformer/fan control center.
 

Last edited by Astuff; 06-22-18 at 03:45 PM.
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Old 06-22-18, 04:06 PM
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I agree.

In the last picture.... the one I labeled.... it looks like there is a "soldered in" blue jumper from Y to G.
It may just be under the screw terminals. That jumper should turn the blower on in A/C mode.
 
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Old 06-22-18, 04:16 PM
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PJ - The soldered wires connected to G and C on a fan control center normally go around and down to drive the relay coil. The picture distorts things a bit.
 
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Old 06-22-18, 04:19 PM
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You're right. When I look at the second picture..... there is no jumper.
So like you said..... move the two wires from Y to G.
 
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Old 06-22-18, 04:35 PM
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Hi guys really appreciate the help.

so I take blue wire and connect to Rc and remove jumper correct?
move both wires on transformer from Y to G.

I will report back.

thanks
 
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Old 06-22-18, 04:56 PM
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Great news it works thank you.
 
 

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