"Who Cares" wrote in message
...
We had the same problem about a month ago. We were low on freon.
Guy came, added freon and no more problems.


1-Did he check your evap coil and blower BEFORE he did this?
2-How much refrigerant did you pay for?
3-Did he show you on the scale that it was X # of lbs?
4-did he use a scale??
5-Did he just hook gauges up and take a jug and charge it?
6-Did he check superheat, or just go by the gauges?
7-were did he find the leak on your sealed system?
8-did he check for leaks?


Sounds to me, that if he didnt do the right thing...you still got problems..




On Wed, 2 Jul 2003 20:36:23 -0700, "CBHvac"
wrote:


"Bill Christens-Barry" wrote in message
...
Our home central A/C has developed a problem recently - water sometimes
drips out of the ducting surrounding the evaporator coil at a high
rate.
Cooling in the home seems to be diminished as well.

This condition is sporadic, and we never had the problem in years past.
I've also heard sporadic banging sounds coming from inside the duct
from
this area.

Mice...LOL


Today I formed the hypothesis that condensate is freezing on the
evaporator, blocking airflow. The banging could be ice falling off the
evaporator, and the fairly significant water could be the ice melting.

IT sure could be..


Does this sound like a plausible/likely explanation? What other things
might cause this problem? What ultimately is the cause. And what should
I do about it?

in order..
yes.
several
dunno
call a local hvac company to properly diagnose your problem.


Part of my hypothesis is that after several years of drought and dry
weather (here in sodden Maryland), this year's rainfall has meant high
humidity and hence more condensate than in the past.

Has NO bearing. None. A freezing unit, is a unit with problems...period.


Could it also be that grime/dust has built up on the heat fins in the
evaporator? Is opening up the ducts and cleaning these something
reasonable to think about doing, or does build up usually signal the
need for a new evaporator/heat exchanger? Is cleaning practical without
specialized tools?

in order..

Could be.
No.
no
no.


What about insufficient airflow through the ducts - would this increase
condensation and lead to ice formation (which would further restrict
airflow)?

No, on the condensation...not a huge amount..
and yes to the ice..

If I increase the airflow (by opening all vents wide open), is
the problem likely to go away?

Nope.
It should NOT be freezing..
Particularly if its not till now.





Thanks.

Bill Christens-Barry

--
Wm A Christens-Barry, PhD
Equipoise Imaging, LLC

http://www.eqpi.net/eqpi/