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Old 08-21-2011, 12:42 PM   #16
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A/C fan runs permanently


I found the way to remove the cover.. It is a fan limit L4064A 1347... It was not glued to the wall.. a couple of screws and it is out.. it has what is called an insertion element of 8" to sense temperature (I guess).
Anyway... here are a couple of pictures. One is the fan limit alone and the other is most of the components. On the left, behind the center transformer is only the switch box. The relay is removed. You see the white socket as part of the transformer assembly, and you also see the small redish board where the terminals C, R, G, Y and W are.
This is at least 130 bucks piece (quick search.. I need to do more search and see if I can find it for less), so I'd like to make sure it is really faulty to order it.
1a. Is it possible to remove the fan limit from the circuit and have these components work as if there was no furnace? after all we are in summer. amd how do we do this?
1b. Can this unit be replaced with other models more economic?

2a. Also, what do u think the small cables from the fan limit are for ? One goes to a terminal close to the furnace PILOT swicth and the other to the W terminal in the redish board, which in turn goes to W in the Thermostat (Heat).
2b. What are those two terminals close to the PILOT that indicate 24V AC..
2c. How do they close, is it the PILOT swicth that does it?
Thanks again..
CPA.
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A/C fan runs permanently-dscn0990_20110821a_l4064a_1347_fan_limit_honeywell.jpg   A/C fan runs permanently-dscn0977_l4064a_1347.jpg   A/C fan runs permanently-fancontrol_0821a.jpg  


Last edited by cparias; 08-21-2011 at 07:51 PM.
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Old 08-21-2011, 12:56 PM   #17
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A/C fan runs permanently


The three pointers on the dial are in order from left to right. Fan off, fan on, Burner off. What temp is the off pointer set to.
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Old 08-21-2011, 03:49 PM   #18
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A/C fan runs permanently


Fan Off = 100
Fan On = between 130 and 140
Burner Off = 200
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Old 08-21-2011, 06:21 PM   #19
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A/C fan runs permanently


Well, unless its 100 where the furnace is, or the return air temp is 100, sounds like a bad fan limit. Just replace it.
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Old 08-21-2011, 07:59 PM   #20
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A/C fan runs permanently


It looks like the Fan Control is bad. I measured Ohms between the cables from the left side and they are closed, when they should normally be open.
We are not at 100 degrees in the house or near the furnace.. But isnt the second setting (130-140) the temp that would cause the fan to turn ON?

Also, why cant I just disconnect the left side cables of the Fan Limit for now?.. It is not heat what we are using now.. It is the cooling system...

Last edited by cparias; 08-21-2011 at 08:02 PM.
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Old 08-21-2011, 08:31 PM   #21
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A/C fan runs permanently


Quote:
Originally Posted by cparias View Post
It looks like the Fan Control is bad. I measured Ohms between the cables from the left side and they are closed, when they should normally be open.
We are not at 100 degrees in the house or near the furnace.. But isnt the second setting (130-140) the temp that would cause the fan to turn ON?

Also, why cant I just disconnect the left side cables of the Fan Limit for now?.. It is not heat what we are using now.. It is the cooling system...
Yes the 130 to 140 is the temp that it should close at.

Leave it connected and get a new one ordered and installed. You would be surprised how many people have disconnected it, and then forgot that they did, and ran the heat in the fall, and after that, found out the heat exchanger failed becaue of that.

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