Fan/ Limit switch

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Assuming that the dial on the fan/ limit switch is an accurate measurement of temperature, what's the most efficient range of temps that the dial should rest at when the blower is running and the burners are on? Thanks
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On 1 Nov 2006 07:39:24 -0800, snipped-for-privacy@gmail.com wrote:

C'mon.........you dont really expect to save money on your utility bill by adjusting the fan and limit control on your old ancient belt driven clunker, do you? Bubba
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It should rest where ever it needs to to maintain the manufacturer's specified temperature rise.
On 1 Nov 2006 07:39:24 -0800, snipped-for-privacy@gmail.com wrote:

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Air flow and output determines temperature rise, not a fan/limit. If the fan settings did, you wouldn't need the limit, would you?
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Respectfully, Bob

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My point exactly.
On Thu, 02 Nov 2006 00:06:38 GMT, "Bob_Loblaw"

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wrote

Your point exactly??? You said " It should rest where ever it needs to to maintain the manufacturer's specified temperature rise." If the temperature rise is specified for 30 to 60 degrees Delta T, how does the fan on/off setting control this? Inquiring minds want to know.
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The fan/limit doesn't control this, Bob. Therefore the thing will rest wherever it happens to when the furnace has the required temp rise. Perhaps my wording wasn't clear enough for you. I knew what I meant.
You're not getting touchy now, are you?
On Thu, 02 Nov 2006 01:34:35 GMT, "Bob_Loblaw"

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More to the point, you're not making any sense. Your words..." Therefore the thing will rest wherever it happens to when the furnace has the required temp rise." Care to try again??
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"Bob_Loblow" wrote:

Yo Bobbin Bob !
Just for shits & giggles, go to your furnace, disable the limit and the blower and then call for heat. Get back to us after your fucking house burns down.
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You know, the easiest and best way that the homoaner can improve his furnace's efficiency and help improve his neighborhood would be for him to just disconnect the flue pipe...
wrote

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snipped-for-privacy@gonefishin.net wrote

So you're another one that thinks the fan on/off settings determines the rate of rise. Maybe you should share this revelation of yours with Lennox, Trane, ICP, and the rest.....or maybe you should team up with Dildo, and Scott and take a service tech course! Maybe you could all go fishing together..between the three of you, you'd have one set of teeth and a complete set of banjo strings!! ROTFLMAO!!! Hold onto your rod, little fella!
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As low as possible. Which means that the heat is blowing into the home, not up the chimney.
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i had a comment, but i want to give you the chance to clarify your statement before accepting it at face value, and correcting it. please explain. thanks,
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Nathan in Montana
http://BighornRefrigeration.com
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Q: Assuming that the dial on the fan/ limit switch is an accurate measurement of temperature, what's the most efficient range of temps that the dial should rest at when the blower is running and the burners are on? Thanks
A: When the furnace is running, if the fan limit switch indicates a lower temp, then the flue gasses will be cooler, also. This is more efficient (efficiency being defined as heat going into the house, not up the chimney). In order to maintain higher temps into the house, the flue gasses will retain more of the heat. So, the most efficient temps (efficiency being measured as heat going into the house) are the lowest ones on the dial. Note, please, the original poster said "rest at when the blower is running". He's asking for the efficiency of the furnace at one specific moment of the run cycle.
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fair enough.
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Nathan in Montana
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Has nothing to do with efficiency.
Sounds like you are one of those homoaners who like to fuck with settings that you know nothing about.
Don't fuck with it-- you might blow yourself up.
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snipped-for-privacy@gmail.com wrote:

The setings are 140 on 90 off and 200 for the high limit. It will run somewhere in between 140-90F depending on what the fan speed is and the size of the duct work. On the data tag it will give a expected temperature rise. As long as you are withing those specs thats is good as it gets.
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Limit is used to set just what word carry it is use as safety device and it is not use to control , Note while both control and limit maybe of same type but are not use necessarily to do the same job. limit if designated as limit, that is your max. or min. operating range and if is set by OEM it should not be change, if it need to be change make sure it is done to the OEM specifications or you could be putting you self in danger or damaged to property Dido say that

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Ok. One more time..................... What in the Fu*K did he just say? Bubba

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