Evap Coils not all sweating

Posted by Ben on May 29, 2007, 9:00 pm

I have two central ac units for my house in central NJ. The
downstairs unit as always worked fine, but not the upstairs unit which
is approx a 100,000 btu unit. I decided to start looking in to it and
noticed that the evap coils are not all cold with the upstairs unit.
Maybe 1/2 to 3/4's of them are cold and sweating. The suction line
doesn't sweat on this unit, but always sweats on the downstairs unit
back to the condensor. So, what are the possible reasons so that when
I have somone take a look, I have a bit more understanding/knowledge.
Thanks, Ben

Posted by =?ISO-8859-1?Q?Tekkie=AE?= on May 29, 2007, 9:51 pm

Ben wrote:

> I have two central ac units for my house in central NJ. The
> downstairs unit as always worked fine, but not the upstairs unit which
> is approx a 100,000 btu unit. I decided to start looking in to it and
> noticed that the evap coils are not all cold with the upstairs unit.
> Maybe 1/2 to 3/4's of them are cold and sweating. The suction line
> doesn't sweat on this unit, but always sweats on the downstairs unit
> back to the condensor. So, what are the possible reasons so that when
> I have somone take a look, I have a bit more understanding/knowledge.
> Thanks, Ben
>

They're all hot and bothered.

Do your research first - Google - not here

Posted by Mo Hoaner on May 29, 2007, 9:52 pm

>I have two central ac units for my house in central NJ. The
> downstairs unit as always worked fine, but not the upstairs unit which
> is approx a 100,000 btu unit. I decided to start looking in to it and
> noticed that the evap coils are not all cold with the upstairs unit.
> Maybe 1/2 to 3/4's of them are cold and sweating. The suction line
> doesn't sweat on this unit, but always sweats on the downstairs unit
> back to the condensor. So, what are the possible reasons so that when
> I have somone take a look, I have a bit more understanding/knowledge.

Well, there's two possibilities:

1. Nothing is wrong, and it's working as designed.
2. It's got some kind of problem that will need to be diagnosed.

> Thanks, Ben

Just how big is that 8 Ton residential AC unit?

Posted by hvacrmedic on May 30, 2007, 1:31 am

Why do you need to understand it unless you're thinking you can fix it
yourself. Since you've had the cover off already, I'd say it's a safe
bet that you're just wanting a freebie. If you just have to know,
there are precisely two possible reasons for what you're seeing:

1) Undersaturated coil.
2) Nothing wrong at all.

There are a ton of specific reasons that #1 can occur, and keep in
mind that not all of those indicate a problem with the system itself.

Which of those possibilities do you think we should pick right out of
our ass for you?

Posted by Ben on May 30, 2007, 10:19 am

> > I have two central ac units for my house in central NJ. The
> > downstairs unit as always worked fine, but not the upstairs unit which
> > is approx a 100,000 btu unit. I decided to start looking in to it and
> > noticed that the evap coils are not all cold with the upstairs unit.
> > Maybe 1/2 to 3/4's of them are cold and sweating. The suction line
> > doesn't sweat on this unit, but always sweats on the downstairs unit
> > back to the condensor. So, what are the possible reasons so that when
> > I have somone take a look, I have a bit more understanding/knowledge.
> > Thanks, Ben

> Why do you need to understand it unless you're thinking you can fix it
> yourself. Since you've had the cover off already, I'd say it's a safe
> bet that you're just wanting a freebie. If you just have to know,
> there are precisely two possible reasons for what you're seeing:
> 1) Undersaturated coil.
> 2) Nothing wrong at all.
> There are a ton of specific reasons that #1 can occur, and keep in
> mind that not all of those indicate a problem with the system itself.
> Which of those possibilities do you think we should pick right out of
> our ass for you?

Wow....
I never imagined what I thought would be a simple quesiton would
invoke so much
hostility. You asked:
'why do I need to understnd it unless you think you can fix it
yourself. I'd say
it's a safe bet that you're just wanting a freebie'
I wanted to understand because I never thought this system worked
correctly.
It never cooled well. Was never able to keep up with cooling on hot
days and taking a long time in the
evening, after the sun went down, to bring the room to a comfortable
temperature.
So what if I did want what you call a 'freebie' ? Or, what if I just
wanted to have a better understanding so that
I wouldn't need to take the word of a disreputable repair person,
which I have seen plenty of

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