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Hermatic vs Scroll essenz 07-01-2008
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Posted by essenz on July 1, 2008, 11:18 pm
I just picked up some new old stock Lieberts (1984 and 1990). Back
then Liebert used 3-PH Hermatic Compressors on their 30k-70k BTU size
units.
On the newer units I have, they use Scroll compressors.
I'm curious as to why?
I know scroll is supposed to be more efficient, but isn't hermatic
more reliable long-term. If the hermatic style lasts longer, but is
less efficient then scroll, how much less efficient.
I can easily swap out these NoS hermatic compressors with brand new
copeland scroll units, but I'm not sure if its worth it.
On a side note, I have a unit with a Copeland 5-ton scroll (3-PH 460V)
that has developed a significant vibration. Charge is good, sight
glass is clear, lube is good, just has a bad vibration you can really
feel on the floor up to 5-10 ft away. The comp is on rubber
insulators, and if you push it in a certain direction it goes away a
little, but not much. My technician told me not to worry or advance
replace it, just let it run, if it breaks down will fix it then. I am
concerned about performance loss, and the vibrations are annoying as
hell.
-John
Posted by .p.jm on July 2, 2008, 12:07 am
wrote:
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        Little tiny baby units ! What are they, the ceiling-hung
thingies ?
        Where did you get them, an 'abandoned self-storage unit
auction' ? :-) Probably worth a good $ 30 / each for the scrap
metal.
        Got much warranty left on them ? :-) Well, congrats, you've
got some crap that's been sitting around for 20 - 25 years rotting,
and if any of them run more than a year you got lucky.
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Posted by KJPRO on July 2, 2008, 12:41 am
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So... "advance replace it"
Unless of coarse... you like to be annoyed.
Posted by Noon-Air on July 2, 2008, 8:38 am
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Ummm most all scrolls are hermetic. Hermetic = sealed can
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Why would you want to??
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Just fix the damn thing.
Posted by KJPRO on July 2, 2008, 6:31 pm
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Never saw a scroll with a blown pin? :-)
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