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mustang64 03-06-2013 11:55 PM

Lennox fan blower motor
 
Can someone please help.
I have a Lennox Elite Series furnace that the blower motor runs all the the time. The heat anticipator is set accordingly on my Honeywell tstat. The furnace cycles okay and I'm getting heat. The tstat is set for heat and the fan is set for auto.
What seems to be the problem??

beenthere 03-07-2013 04:45 AM

Could be a shorted wire. Disconnect the wire from the G terminal at the furnace, and see if it still does it.

mustang64 03-07-2013 05:07 AM

I tried that. The fan blower shuts off.

beenthere 03-07-2013 05:16 AM

Short in wire from stat to furnace, or a bad thermostat/thermostat back plate.

Put wire back on at furnace. remove it from thermostat. See if it does it. if it does, then short in wiring, if it doesn't, then bad stat.

mustang64 03-07-2013 06:40 AM

Thanks. I'll try that.

mustang64 03-07-2013 03:37 PM

Hello beenthere,

I have three wires leading to my tstat, white wire leading to "W", black wire to "Y" and the red wire leading to Rc with a jumper wire to Rh.

So which wire represents the same wire as G at the furnace??

JScotty 03-07-2013 04:17 PM

Quote:

Originally Posted by mustang64 (Post 1131894)
Hello beenthere,

I have three wires leading to my tstat, white wire leading to "W", black wire to "Y" and the red wire leading to Rc with a jumper wire to Rh.

So which wire represents the same wire as G at the furnace??

It's G at the thermostat too. Which sounds like you don't have a wire to. You may be jumped from Y to G inside your furnace. Otherwise I don't see how your fan comes on for A/C

beenthere 03-07-2013 04:38 PM

look at the wire connected to G in the furnace, and trace where it comes from. If its jumpered to R, that is why the blower runs all the time.

mustang64 03-07-2013 11:08 PM

This is what I have.
The three wires at the tstat red-R, white-W, and black to Y are the same at the furnace.
There is a white-C and black to Y leading to the AC unit.
There is a third cable white-G and black to R on the furnace and on the other end the two are tied off.
This is why the blower runs all the time.

Can you please let me know how to rewire the furnace without having to fish a cable from the tstat to the furnace to connect the G's so the that the blower will not run constantly.
Thanks for your help.

This a great chat room!!

beenthere 03-08-2013 06:36 AM

Disconnect the third cable from both the R and G. Then run a wire from Y to G in the furnace. The fan will run when the thermostat calls for cooling that way. And the furnace control board will bring the fan on by a built in timer when the thermostat calls for heat. This is of course presuming the control board works properly.

mustang64 03-08-2013 03:43 PM

Hello beenthere,

Did what you said and it worked like a charm!!

Thank you very much for your greatly appreciated help and understanding.
Once again great bunch of people on a great chat room!

PS. Do recommend the fan blower running all the time or whenever needed??
I tried to put the fan to "on" to see if the fan would run, it didn't.

If you answer yes to my question, then I guess it's safe to assume that I wire the system the way it was originally?

beenthere 03-08-2013 03:52 PM

On standard blower motors, they use a lot of electric to when ran 24/7. So unless your running the fan to even out temps in the house. better to only run it when the heat or cooling is running.

With only 3 wires at stat, someone may have put a switch on at the furnace to be able to run the fan 24/7 at times, and then abandoned it when it got turned of by accident during the cooling season. And caused the indoor coil to freeze over.

mustang64 03-08-2013 03:59 PM

Quote:

Originally Posted by beenthere
On standard blower motors, they use a lot of electric to when ran 24/7. So unless your running the fan to even out temps in the house. better to only run it when the heat or cooling is running.

With only 3 wires at stat, someone may have put a switch on at the furnace to be able to run the fan 24/7 at times, and then abandoned it when it got turned of by accident during the cooling season. And caused the indoor coil to freeze over.

Then it's best I live things the way they are.
Thanks again for all your help!!

mustang64 03-09-2013 04:46 PM

Hello beenthere,
For a reason that I won't get into, I moved the inlet and out pressure taps on my Honeywell gas valve. I turned them back to where I think they were set.
If that is not the case, could I have affected the gas flow a great deal??
Do I now need to get an HVAC guy in to check the gas flow??

Thanks.

how 03-09-2013 04:53 PM

A lot out of adjustment or a little, is way too vague for anyone to know outside of using a manometer or clocking the meter and doing it properly.


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