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Subject Author Date
short cycling Dan 01-14-2007
`--> Re: short cycling =?iso-8859-15?Q...01-16-2007
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Posted by Dan on January 14, 2007, 8:27 pm
25+ year old NG Furnace runs 3 mins then off 9 mins to maintain within +/-1F
of the setpoint. I am timing it from by the meter start/stop sounds so the
fan is on for 4-5 mins of which the 1st 2 produce no real heat. Seems very
inefficient to me. Is this called short cycling? Is it possible to reduce
the output BTU's so it runs longer?



Posted by Bob_Loblaw on January 14, 2007, 8:52 pm




> 25+ year old NG Furnace runs 3 mins then off 9 mins to maintain within
> +/-1F of the setpoint.


And???.....sounds to me like it's doing it's job...
BTW, it's ready to retire....


--
Respectfully, Bob

Posted by James on January 14, 2007, 8:54 pm
Replace the thermostat.

> 25+ year old NG Furnace runs 3 mins then off 9 mins to maintain within
> +/-1F of the setpoint. I am timing it from by the meter start/stop sounds
> so the fan is on for 4-5 mins of which the 1st 2 produce no real heat.
> Seems very inefficient to me. Is this called short cycling? Is it possible
> to reduce the output BTU's so it runs longer?
>
>



Posted by Noon-Air on January 14, 2007, 9:10 pm

> 25+ year old NG Furnace runs 3 mins then off 9 mins to maintain within
> +/-1F of the setpoint. I am timing it from by the meter start/stop sounds
> so the fan is on for 4-5 mins of which the 1st 2 produce no real heat.
> Seems very inefficient to me. Is this called short cycling? Is it possible
> to reduce the output BTU's so it runs longer?

Its long past its normal design service life.... you need to look at
replacing it.



Posted by on January 14, 2007, 9:12 pm

>25+ year old NG Furnace runs 3 mins then off 9 mins to maintain within +/-1F
>of the setpoint. I am timing it from by the meter start/stop sounds so the
>fan is on for 4-5 mins of which the 1st 2 produce no real heat. Seems very
>inefficient to me. Is this called short cycling? Is it possible to reduce
>the output BTU's so it runs longer?
>


absolutely. you probably lack the tools or knowledge though

I have a solution you can apply immediately, no tools or knowledge
needed. open a few windows until the furnace operates at your desired
cycling.

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