Don, there is another reason for an AC unit not to cool well. I haven't seen
it mentioned here so I will. If there is too much freon in the unit the
freon can't expand when it goes past the expansion valve. I have seen this
on central units where the "service man" just had no clue what he was doing.
Check your unit for after market service valves on the lines, if there are
valves added this just could be the problem. This problem can be identified
using pressure readings and thermometers on the freon lines, but someone has
to know what they are doing to interpret the readings this is not magic but
there is a standard temperature-pressure readings published in service
books.
Phil Piper
----Original Message Follows----
Jim, I think you are right. The AC inspection labor charge was only 15
minutes. They preformed what they called a Delta Test, which I understand is
reading the discharge temp coming directly out of the unit after it has been
running for about 4 hours. They noted that the A/C was only putting out 60
degrees and that they inspected the Evaporator and it was clean. Their
recommendation was to replace the unit. That might be what is ultimately
necessary, but I am going to follow your advice and check the condenser
coils and see if any air is short-circuiting around either coil instead of
through them.
If it stops raining here today I will get started on this and post the
results. Thanks
Don Hardman
----- Original Message -----
From: Jim Dunmyer <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, July 30, 2000 8:07 PM
Subject: Re: [VAC] refurbishing 1976 AS 31'
> Don,
> The service guy should have checked the back side of the evaporator
> coils. Normally, the filter is in the front, the fan pulls the air
> through the coils and pushes it out a vent. So, if they're dirty, it'll
> be in the front where it's easy to see.
>
> This is NOT the case with the condensor, there's no filter there.
>
> Make sure that the air can't short-circuit from the fans and go around
> either coil instead of through them.
>
> That 48 degrees doesn't sound right, I think it should be lower.
>
> Someone else mentioned a coil cleaner product. I don't know the name of
> the stuff, but I've seen it demonstrated and used it in an industrial
> setting. Spray it on the coils, let it sit for a short time, then hose
> it off. Removed all the gunk, grease, etc.
>
> <<Jim>>
>
>
> Don Hardman wrote:
> >
> > ----- Original Message -----
> > From: Jim Dunmyer <[EMAIL PROTECTED]>
> >
> > > It sounds like Don's compressor is OK, but some seals are not so
good.
> > > Although I'm unsure what they mean by "seals", I'm guessing that
there's
> > > leakage of the cold air, mixing with some hot air at the evaporator.
"It
> > > seems to me" that some duct tape and/or foam rubber might take care
of
> > > the problem.
> >
> > Maybe this will help, the unit will freeze you out in the evening and
drops
> > the room temp to around 68 degrees but the temp in the trailer gets
pretty
> > warm during the day up to around 80 degrees. Here in Houston we are
getting
> > up to the high 90s daytime and mid 70s at night. This morning the temp
> > coming right out of the vent read 48 degrees but by mid day the temp
coming
> > out of the vent was about 63 Degrees. I looked at the coils from the
inside
> > and they appear clean. Although I have not pulled the top yet just from
> > peering in they also seem clean with no damage. This surprises me since
from
> > the time I bought the trailer 2 months ago we have been cleaning gobs
of
> > dirt and dust from every nock and cranny on the inside of the trailer.
Maybe
> > someone just brushed the coils off and they are still dirty in between.
The
> > unit runs great, no noise, and I would sure like to like to get it
fixed
if
> > possible. I will try cleaning the coils good before I do anything else.
> >
> > I will then call my RV guy and have him explain to me again what he
feels
> > the problem is.
> >
> > Thanks for the help.
>
> --
>
> <<http://www.oldengine.org/members/jdunmyer>>
> <<[EMAIL PROTECTED]>>
> <<lower SE Michigan, USA>>
> <<mailto:[EMAIL PROTECTED]>>
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