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[yoderheating]

I have not read this whole post but using a fan center to run a oil furnace is rather simple. Use the black and white wire to power the fan center from the oil furnace. Tie the red wire in with the black wire used to power the fan center so it has constant power on the red wire. Cut the wire to the fan motor and run it through the relay. The black wire off the relay needs to go to the fan motor and the brown wire needs to go to the wire that normally supplies the power to the fan. This will allow the existing heat to work because the black and brown wires are normally closed. Now, using a three wire thermostat wire conect the new thermostat to the relay, c to c, r to r, w on the thermostat to g on the relay. Now when the new thermostat calls for heat it will activate the relay and send power from the red wire to the black which will turn on the fan. The brown wire will be disconnected when the relay is engaged so no power will back feed. Hope this helps. 

[RSI]

I just looked at the wiring diagram again and you need to connect the W on the thermostat to the G on the Honeywell fan center. Don't go to the C, that would probably fry the thermostat.

[yoderheating]

 The C is the common, if you have a digital thermostat you need to hook it up to have power. If you are using a mercury thermostat you will not use it.

[pintopaul]

ok on the fan controller does it have to be mounted flat?

[RSI]

No, that shouldn't make any difference which way it is mounted.

[RSI]

The C is the common, if you have a digital thermostat you need to hook it up to have power. If you are using a mercury thermostat you will not use it.

Good point, I didn't think of that.
All the digital thermostats I have used have batteries and don't use the common wire.

[pintopaul]

rsi :yoderheat is saying to hook it differant which way should i go i still want the oil furnace to work if my wood stove goes out if i hook it your way will it still work and not give twice the votage to the fan limit switch? help thought i had it figured out with your help but now yoderheat has me thinking again ... like i said i rent this house and dont want to screw something up but i need to do it myself to save money. thanks

[RSI]

Either way will work.
The way I said to hook it up is just shorting the fan switch out. 
I believe that is the temperature switch on the furnace that turns the blower on. The other one is the limit switch. When you had that switch jumpered out did the furnace fire when you turn the thermostat up?

[pintopaul]

didnt try to fire furnace , i will thou

[yoderheating]

 Sorry to confuse you. I was just telling you how I install them but like I said before there are a number of ways that will work. Really its pretty easy, I wouldn't over think it.

[pintopaul]

ok wired , thermostat hooked. turn wood boiler thermostat up PRESTO the fan comes on . turn the thermostat on the oil furnace up PRESTO fires right up. THANKS GUYS YOU GUYS SAVED ME ABOUT 150 FOR THE FURNACE MAN TO COME if we ever meet at a bar drinks are on me ......

[pintopaul]

RSI if you still on here i need your help again another thermostate, furnace set up (help) my cell is 518 538 4069 you helped me before hope you can help again. thanks paul

[RSI]

I am still here. are you replacing an old thermostat or is this something else completely?

[pintopaul]

setting up my brother outdoor wood boiler he has a 4400 and a oil furnace, i dot have the diagram anymore that i had you draw me up. he want to use 2 thermostats like i did. i have pictures of his oil furnace and was planning on using the same set up i did but his furnace is newer than mine. if you have a cell and get pictures i can send them to you. my cell is 518 539 4069 thanks paul

[RSI]

You can send them to 608-438-8300