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When Am I Short Cycling?

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Subject Author Date
When Am I Short Cycling? Rob 06-11-2007
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Posted by Rob on June 11, 2007, 8:27 pm
I timed my new unit and found it operating 11 minutes on and 9 minutes
off with a 76 F setpoint and 82 F outside air temperature. I didn't
get more than 1 degree differential. Three cycles in one hour is most
definitely not short cycling, but got me wondering how many cycles an
hour would be considered short cycling under these conditions. Five?
Six?


Posted by Bill on June 11, 2007, 9:04 pm

> I timed my new unit and found it operating 11 minutes on and 9 minutes
> off with a 76 F setpoint and 82 F outside air temperature. I didn't
> get more than 1 degree differential. Three cycles in one hour is most
> definitely not short cycling, but got me wondering how many cycles an
> hour would be considered short cycling under these conditions. Five?
> Six?

Get a bucket to measure the water coming off the coil in an hour.
Get the complete pressures, temperatures and airflow of your entire
system as well as the names and model numbers of your evaporator and
condenser.
The full load calculation of your house and the day and time you want to
check it.
After comparing what you have to the specifications of your system so
that you know if you are within specs and getting what it's rated at.
Post the data here and we'll be able to tell you.

--
dang's claim to fame:
http://calsun.canoe.ca/News/Columnists/Martin_Kevin/2006/03/09/1479243.html

Posted by on June 12, 2007, 2:08 am

>I timed my new unit and found it operating 11 minutes on and 9 minutes
>off with a 76 F setpoint and 82 F outside air temperature. I didn't
>get more than 1 degree differential. Three cycles in one hour is most
>definitely not short cycling, but got me wondering how many cycles an
>hour would be considered short cycling under these conditions. Five?
>Six?

if you're that much concerned, ensure your digital t-stat is set up
for 3 cph instead of 6.

if its 82 outside & you got your ac running, I'd say you're one
spoiled sob.

Posted by Tony on June 12, 2007, 7:41 am
Well Rob now you got worry some
In my house my AC may be on from 60 F and up
but that depend largely if I have TV on, if I just took shower,
if my wife is cooking, if she have prepare some
Mexican been for me and boy that definitely increase
the heat in surrounding where I am it may even cause the
AC to run constantly, so cycling is last thing on my mine.
Tony


>I timed my new unit and found it operating 11 minutes on and 9 minutes
> off with a 76 F setpoint and 82 F outside air temperature. I didn't
> get more than 1 degree differential. Three cycles in one hour is most
> definitely not short cycling, but got me wondering how many cycles an
> hour would be considered short cycling under these conditions. Five?
> Six?
>



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