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Posted by Noon-Air on June 4, 2007, 2:16 pm
>
>>> Bwahahahaha !!!!!!
>>
>>
>> Someone must be using sandpaper again! :-)
>
> My experience is tiny; both of you are supposed to have long
> experience -- but apparently not in Florida.
>
> In my short tenure as a helper, I've seen by now dozens of systems with
> bare vestiges of the evaporator fins left. Salt and sulfur corrosion are
> the main culprits.
ummm.....no. By the time the fins are even half gone, the tubes have so many
holes in them that you can heat the refrigerant leaking out.
> Dumb-assed (read that as "experienced") technicians putting coil-brite on
> full-strength is another big cause.
Acid cleaners need to be outlawed
> Don't underestimate how inefficient a coil will become when the
> fin-to-tube contact rots. It can look just fine, and still not transfer
> heat fast enough to work properly. You don't normally get ice on the fins
> when that happens, just at the U-bends, but it screws up the ability to
> cool the air stream just the same.
Huh???
> Laugh all you want. IIRC, Noon lives in a hot/wet locale. Maybe he can
> illucidate.
yup.... there a couple of caveats tho.......If the coil drain has a proper
trap, the coil will last for 15 - 18 years on average, if no trap, 5 - 8
years before they start leaking like a sieve....normally where the copper
penetrates the tube sheet. Decent air filters help a lot too. If its
installed properly in the first place, then its not a problem. If the system
was installed by the lowest bidder, then all bets are off.
> LLoyd
>
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Posted by on June 4, 2007, 3:43 pm
> > Laugh all you want. IIRC, Noon lives in a hot/wet locale. Maybe he can
> > illucidate.
>
> yup.... there a couple of caveats tho.......If the coil drain has a proper
> trap, the coil will last for 15 - 18 years on average, if no trap, 5 - 8
> years before they start leaking like a sieve....normally where the copper
> penetrates the tube sheet. Decent air filters help a lot too. If its
> installed properly in the first place, then its not a problem. If the
system
> was installed by the lowest bidder, then all bets are off.
What?
What's a drain trap have to do with coil longevity?
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Posted by Noon-Air on June 4, 2007, 4:01 pm
>
>
>> > Laugh all you want. IIRC, Noon lives in a hot/wet locale. Maybe he
>> > can
>> > illucidate.
>>
>> yup.... there a couple of caveats tho.......If the coil drain has a
>> proper
>> trap, the coil will last for 15 - 18 years on average, if no trap, 5 - 8
>> years before they start leaking like a sieve....normally where the copper
>> penetrates the tube sheet. Decent air filters help a lot too. If its
>> installed properly in the first place, then its not a problem. If the
> system
>> was installed by the lowest bidder, then all bets are off.
>
>
> What?
>
> What's a drain trap have to do with coil longevity?
It has to do with the air handler holding the water in the coil pan, and
promoting premature corrosion to the coils and tube sheets. When steel
corrodes(rusts), it expands, and with as thin as the copper tube walls are,
it doesn't take much to pierce them.
All of the evap coils I have replaced in normal resi applications are either
5 - 8 years old (no trap or on trailers) or 18+ years old(proper trap and
drain). Very rarely do I have to replace one that is 10 - 15 years old.
Its not near as big an issue for coils on top of gas furnaces because they
have a positive pressure when they are running. I have only had to replace 2
of those in the last 10 years.
I average 18 - 20 evap coil replacements per year.
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Posted by udarrell on June 4, 2007, 10:16 am
Fins wrote:
>Here in FL, my centeral A/C condensor coils freeze up after running
>for an hour or so.I haad a repair man check it and found the freeon
>was Ok, but said the Evaporator coil was dirty and should be cleaned.
>He also said the system didn't have enough return duct area. The
>house is at least 25 years old and the current a/c unit is 9.5 years
>old. It was working fine with the duct work it has, up until this
>problem.
>The repair man cleaned the coils and I still have the same problem.
>
>Not sure if I want to let him start installing a new duct.
>Any suggestions? He is coming back this morning. Thanks
>
>
The outdoor condenser coils are freezing up, - or is it the indoor
evaporator coil freezing up.
Is this a Heat Pump?
Many years ago, I found a strainer in several old GE condensers that had
plugged.
The techs, not knowing how to troubleshoot, would go out and overcharge
them loading the condenser full of liquid.
The condenser coils were aluminum however, there was copper on both
sides of the strainer.
I immediately diagnosed the problem, and back then, blew the overcharge
and removed the plugged strainers.
Removed all dryers, purged the system, installed new filter-dryers,
evacuated the systems and recharged them.
They performed to specs.
He may be correct concerning the Return Air duct, which should improve
system efficiency.
Do some reading/learning & examine the ductwork for leaks and proper sizing.
http://www.udarrell.com/proper_cfm_btuh_duct_sizing_air_conditioning_systems.html
- udarrell
--
WISDOM PRINCIPLE DIRECTED EMPOWERMENT COMMUNICATIONS -
THE REAL POLITICAL ISSUES and WISDOM BASED PEOPLE EMPOWERMENT
http://www.udarrell.com/
http://www.udarrell.com/my_pages2.htm
http://www.udarrell.com/recognizing_real_enemies.html ***
http://jesuschristsavior.net/Beatitudes.html
Reality Is Not An Easy Thing To Be Confronted With, or to Accept!
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