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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 on July 2, 2008, 12:07 am
wrote:

>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.

        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.

>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

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Posted by KJPRO on July 2, 2008, 12:41 am

>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


So... "advance replace it"
Unless of coarse... you like to be annoyed.



Posted by Noon-Air on July 2, 2008, 8:38 am

>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.

Ummm most all scrolls are hermetic. Hermetic = sealed can

> I can easily swap out these NoS hermatic compressors with brand new
> copeland scroll units, but I'm not sure if its worth it.

Why would you want to??

> 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.

Just fix the damn thing.


Posted by KJPRO on July 2, 2008, 6:31 pm

> wrote:
>
>>
>>>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.
>>
>>Ummm most all scrolls are hermetic. Hermetic = sealed can
>>
> Most? You mean all.

Never saw a scroll with a blown pin? :-)



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