Thermostat wiring and Ac Blower
#1
06-22-18, 02:07 PM
Thermostat wiring and Ac Blower
Hi all
I need help with two issues. First I’m 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 won’t turn on with AC after compressor turns on.
I need help with two issues. First I’m 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 won’t turn on with AC after compressor turns on.
Last edited by PJmax; 06-22-18 at 04:02 PM. Reason: enlarged pics/labeled one
#3
06-22-18, 03:24 PM
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.
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.
#4
06-22-18, 04:06 PM
Group Moderator
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.
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.
#6
06-22-18, 04:19 PM
Group Moderator
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.
So like you said..... move the two wires from Y to G.
#7
06-22-18, 04:35 PM
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
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
