If you were Registered and logged in, you could reply and use other advanced thread options
|
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:
show/hide quoted text
>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.
show/hide quoted text
>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
--
Click here every day to feed an animal that needs you today !!!
www.theanimalrescuesite.com/
Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo online at www.pmilligan.net/palm/
Free 'People finder' program now at www.pmilligan.net/finder.htm
|
|
Posted by KJPRO on July 2, 2008, 12:41 am
show/hide quoted text
>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
show/hide quoted text
>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
show/hide quoted text
> 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??
show/hide quoted text
> 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
show/hide quoted text
> 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? :-)
|
Page 1 of 3 1 2 3 > last >>
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
>then Liebert used 3-PH Hermatic Compressors on their 30k-70k BTU size
>units.