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Old 01-31-2012, 04:51 PM   #1
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Help wiring fan & limit control


Can I get some help wiring the limit and fan control.

Old one



New one, Honeywell L4064


Wiring


Another look




Pilot



Last edited by joe123123; 02-01-2012 at 04:07 PM.
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Old 01-31-2012, 05:39 PM   #2
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Help wiring fan & limit control


try this info http://heaters-home-heating.factoidz...-limit-switch/

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Old 01-31-2012, 06:09 PM   #3
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Help wiring fan & limit control


Red wire to limit line and the black wire attached with the red use it and connect it with the red and jump it to the fan line.

In between the fan lin and limit line there is a brass tab, break it and remove it

the other black wire goes to the limit load

and the blue goes to the fan load
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Old 02-01-2012, 05:01 PM   #4
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Help wiring fan & limit control


Thanks Plumber101, could you just confirm the following image for me, thanks again.

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Old 02-01-2012, 05:46 PM   #5
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Help wiring fan & limit control


That is correct

However I told you to remove the brass jumper DO NOT remove the jumper
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Old 02-01-2012, 08:33 PM   #6
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Help wiring fan & limit control


I have a safety issue with the electrical advise that is being given here and I think fan and limit lines are being mixed up!

From my knowledge of this old style of control......
The Red line (1) is the 120V power.
The blue line (2) goes to the fan motor trough the temp adjustment..
The brown line (3) is the slaved power to a limit.
The brown line (4) is the limit return to the power the transformer.

For the new fan/limit control.
The red line (1) can go to either bottom connection of the new fan/limit.
The blue line (2) goes to the top left connection marked fan.
The brown line (4) goes to the top right connection marked limit.
The tab is left in place to power both the fan and the limit.
And the brown line (3) is not used as it is internal to the new control.

Last edited by how; 02-01-2012 at 08:40 PM.
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Old 02-01-2012, 08:56 PM   #7
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Help wiring fan & limit control


Quote:
Originally Posted by how View Post
I have a safety issue with the electrical advise that is being given here and I think fan and limit lines are being mixed up!

From my knowledge of this old style of control......
The Red line (1) is the 120V power.
The blue line (2) goes to the fan motor trough the temp adjustment..
The brown line (3) is the slaved power to a limit.
The brown line (4) is the limit return to the power the transformer.

For the new fan/limit control.
The red line (1) can go to either bottom connection of the new fan/limit.
The blue line (2) goes to the top left connection marked fan.
The brown line (4) goes to the top right connection marked limit.
The tab is left in place to power both the fan and the limit.
And the brown line (3) is not used as it is internal to the new control.

Thanks for catching that How. For some reason I didn't see the wiring diagram and all the wire looks black to me except for the red wire.
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Old 02-01-2012, 09:32 PM   #8
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Help wiring fan & limit control


Okay one thing, what if I have already remove the jumper ? lol
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Old 02-01-2012, 10:06 PM   #9
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Help wiring fan & limit control


put a jumper wire between fan line and limit line
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Old 02-01-2012, 10:25 PM   #10
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Help wiring fan & limit control


Okay that's what I figured, thanks.
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Old 02-02-2012, 09:09 AM   #11
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Help wiring fan & limit control


I think the brown fan L1 (hot) should go to the new fan and limit and the jumper should have eliminated. bot fan and limit are seperate circuits.

What use is taping off a hot wire when it is meant to be used.
How, what makes you think and what do you mean the brown fan line wire is "internal" to the new control?

Mind ' splainin' that one?

Last edited by hvac5646; 02-02-2012 at 09:18 AM.
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Old 02-02-2012, 11:10 AM   #12
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Help wiring fan & limit control


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I think the brown fan L1 (hot) should go to the new fan and limit and the jumper should have eliminated. bot fan and limit are seperate circuits.
Nope, L1 is not brown. The limit is also 120V powering the transformer.

On these older furnaces, the fan/limit control had a central probe for fan control and a small limit (connected through the brown wires) on the end of it.
This could be proven if the op submits another picture of the old part extracted from the furnace.
Following the blue or red line will also demonstrate which line eventually connects to the motor, leaving the other as the power lead.

The old part was wired that way to give techs the option of seperating the two circuits for a 120V & 24V fan & limit setup. This one came from the OEM the way we see it because that option wasn't utilized.

The new part has a single power source that internally continues to both the fan and the limit through the switches. The brown colored safety circuit can be used used as a low voltage circuit with the jumper removed but it will require rewiring the transformer setup.

Last edited by how; 02-02-2012 at 11:17 AM.
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Old 02-02-2012, 11:30 AM   #13
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Help wiring fan & limit control


yeah but using the brown wire (with the jumper removed on the new fan and limit) you could safely wire either a 24v secondary or a 110v primary xfmr circuit leaving the fan side isolated from the limit side.

As a kid working with Uncle I saw several early 1950s low boy and Luxaire furnaces that we replaced the fan and limit control on with the (then) new Hwell spiral sensor F and L. And they were OEM wired 110v on each side of the original F and L.
Didn't mean to imply the brown was L1 xfmr, only that it was powered for the fan and could be wired as described above.


Last edited by hvac5646; 02-02-2012 at 11:34 AM.
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