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Old 12-22-2011, 01:58 PM   #1
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Wiring fan control relay


Hello,
I was hoping to get some help with an issue I am having.
I want to be able to control my blower fan from the thermostat switch upstairs.

My Current setup:
Forced Hot Air Furnace
R8184G Primary
R8285A Fan Control
L6046A Fan/Overload
4 Speed Fan

Current Hookup:
Thermostat hits the primary for heat.
Fan Med-Hi Setting is wired to the NC side of the relay and feeds the FAN/Overlimit so the fan will kick when the plenum is up to temp.
Low speed fan is connected to Fan/Overlmit for constant run, with an interrupt switch wired in.

My issue is tripping the high speed fan that is hooked up to the N.O Leg of the relay. Because the thermostat is supplied with 24V by the primary I have no closed loop to hit the G terminal with on the fan control.
Is there a simple solution to connecting the primary to the fan control through the C terminal to that R from the primary would bridge to G when the fan switch is hit on the thermostat?

Thanks for any help you can provide!
Merry Christmas!

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Old 12-22-2011, 02:10 PM   #2
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Wiring fan control relay


no green wire running to your stat? the manual fan switch on your stat should bring on high side of blower

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Old 12-22-2011, 02:23 PM   #3
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Wiring fan control relay


Hi Plummen,
Thanks for jumping on here so quickly.

There is a green wire there but it is not hooked up to anything now.
Inside the stat the Rh and Rc terminals are jumped together.
If I just ran the G from the stat to the fan control would the fan control not care that the 24V was coming from the Primary's transformer and simply trip the relay or would I hear a loud pop and be cold for the night?

Thanks Again!
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Old 12-22-2011, 02:44 PM   #4
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Wiring fan control relay


the rc/rh are normally jumpered in the stat,you only need 1 power wire that way.
the green would normally go to the g terminal in the stat then to the g terminal on the fan control center or board inside your furnace.
can you post a picture of the controls inside your furnace?
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Old 12-22-2011, 02:59 PM   #5
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Wiring fan control relay


Here are a few pics. I dont have one with the overall layout but im sure youve seen enough of them!

Thanks!!!!
Attached Thumbnails
Wiring fan control relay-img_0299.jpg   Wiring fan control relay-img_0300.jpg   Wiring fan control relay-img_0304.jpg   Wiring fan control relay-img_0306.jpg  
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Old 12-22-2011, 03:00 PM   #6
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Wiring fan control relay


Sorry about the mess. The guy that lived here before me didnt lift a finger. Its a bit dirty... On another note, why do I have the burn marks around the flame viewing door?
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Old 12-22-2011, 03:09 PM   #7
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Wiring fan control relay


is there a g terminal in that top left picture/fan control center?
if theres a g terminal thats where the other end of the green wire from stat should go
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Old 12-23-2011, 08:40 AM   #8
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Wiring fan control relay


http://customer.honeywell.com/techli...t/69-0617B.pdf

Looks like you will need to separate the Rh and Rc.

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Old 12-23-2011, 09:03 AM   #9
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Wiring fan control relay


Wire the stat Rc and G to R and G on the fan center as you would on a natural gas furnace. The R8184G would take the rest of the stat wires.


Natural gas example...
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Old 12-24-2011, 11:44 AM   #10
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Wiring fan control relay


Looks like only two wires going to fan motor you would have to rewire the fan control as well as provide low voltage from the thermostat
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Old 12-24-2011, 11:50 AM   #11
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Wiring fan control relay


this link may work for your fan control http://s3.pexsupply.com/manuals/1262..._PROD_FILE.pdf
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Old 12-24-2011, 11:56 AM   #12
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Wiring fan control relay


I see a red, white and blue wire to the motor. (The 2 speeds and a neutral) This should be verified.

Last edited by Houston204; 12-24-2011 at 12:01 PM.
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Old 12-24-2011, 12:18 PM   #13
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Wiring fan control relay


Houston204 I see a red, white and blue wire to the motor. (The 2 speeds and a neutral) This should be verified.

Yep I see the white now
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Old 12-24-2011, 12:22 PM   #14
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Wiring fan control relay



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