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This may sound like a dumb question, but I am not against asking those kind.  We installed a Liebert cooling system for our server room a 3-4 years back.  I was under the impression it could run on one of the compressors if one went out and that it would alternate between the two in order to ensure both were functioning, etc.  I was also thinking that one compressor could be replaced while the other was working.  As for the outside unit, I was thinking that it uses 1 or 2 or 3 blowers as needed and that any one could be turned off to clean that third of the unit.

All being said, it appears the AC service company wants to shut down the whole system to clean the outside unit.  When asked they tell us that is the way it is. 

So, does anyone know if my thoughts are generally correct for server room class Liebert systems or was I just under the wrong impression?  What do other do when you only have the one cooling unit and the AC service people want to shut it down for cleaning?

We tried to contact Liebert, but it appears they only talk to the AC service companies.

Thanks,

John

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  John R. Davis  <davisj@marietta.edu>
  Chief Information Officer
  Marietta College
  215 Fifth St.
  Marietta, OH  45750
  Voice: 740-376-4390
  Fax:   740-376-4812
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Comments

You should usually have two cooling systems. God bless, Sam Young Chief Information Officer Point Loma Nazarene University Individualization ~ Achiever ~ Learner ~ Belief ~ Activator From: John Davis > Reply-To: EDUCAUSE Listserv > Date: Tue, 17 Apr 2012 14:14:01 -0400 To: EDUCAUSE Listserv > Subject: [CIO] Liebert Cooling This may sound like a dumb question, but I am not against asking those kind. We installed a Liebert cooling system for our server room a 3-4 years back. I was under the impression it could run on one of the compressors if one went out and that it would alternate between the two in order to ensure both were functioning, etc. I was also thinking that one compressor could be replaced while the other was working. As for the outside unit, I was thinking that it uses 1 or 2 or 3 blowers as needed and that any one could be turned off to clean that third of the unit. All being said, it appears the AC service company wants to shut down the whole system to clean the outside unit. When asked they tell us that is the way it is. So, does anyone know if my thoughts are generally correct for server room class Liebert systems or was I just under the wrong impression? What do other do when you only have the one cooling unit and the AC service people want to shut it down for cleaning? We tried to contact Liebert, but it appears they only talk to the AC service companies. Thanks, John ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ John R. Davis > Chief Information Officer Marietta College 215 Fifth St. Marietta, OH 45750 Voice: 740-376-4390 Fax: 740-376-4812 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Hi John,

 

            I don’t have enough knowledge to answer your questions, but I can tell you that we’ve had Liebert cooling systems in place for at least 10 years in one data center and over 5 years in another, and we’ve never had to shut down either of them for routine maintenance and cleaning.

 

Mickey

*******************************************************************************

Michael R. Belote

Chief Technology Officer

Mercer University

1400 Coleman Avenue

Macon, GA 31207

O: 478-301-2850

M: 478-719-2955

http://IT.Mercer.edu

 

John-

Your instincts are correct.  We have dual Lieberts for all of our machine rooms.  We run them as you suggest in a "lead-lag" sequence and we have auto-failover so if one quits the other will kick in when the ambient temperature rises to the necessary set point.  As for the compressors:  we have a single outside compressor for each interior unit and yes, we can bring either system down for maintenance or repair while we run the other one (though we have to override the auto-failover when we do this).

Marty

=================================
Martin Ringle, Chief Technology Officer   
Reed College, Portland, OR 97202          
503-777-7254   email:   ringle@reed.edu                             
=================================


I guess I was not clear on the Liebert unit.  First, we only have one Liebert unit.  It has 2 compressors in the inside unit.  The outside unit has 3 fans.  So, the question is about cutting one of the fans off to clean the coils while the other fans continue to run.

Our big problem is we need to find another Liebert certified company to do maintenance.

Thanks

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  John R. Davis  <davisj@marietta.edu>
  Chief Information Officer
  Marietta College
  215 Fifth St.
  Marietta, OH  45750
  Voice: 740-376-4390
  Fax:   740-376-4812
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: "Marty Ringle" <ringle@REED.EDU>
To: CIO@LISTSERV.EDUCAUSE.EDU
Sent: Tuesday, April 17, 2012 2:47:33 PM
Subject: Re: [CIO] Liebert Cooling

John-

Your instincts are correct.  We have dual Lieberts for all of our machine rooms.  We run them as you suggest in a "lead-lag" sequence and we have auto-failover so if one quits the other will kick in when the ambient temperature rises to the necessary set point.  As for the compressors:  we have a single outside compressor for each interior unit and yes, we can bring either system down for maintenance or repair while we run the other one (though we have to override the auto-failover when we do this).

Marty

=================================
Martin Ringle, Chief Technology Officer   
Reed College, Portland, OR 97202          
503-777-7254   email:   ringle@reed.edu                             
=================================

My guess is you have about the same system we do, maybe slightly larger. We have a 10 ton Liebert Deluxe System 3. Our outside unit has two fans. My understanding is that the compressor and condensor fan units are separate systems with separate coolant piping. If you look at your outside unit I think you’ll see two sets of piping, one for each compressor.

 

We have a Liebert certified company that does bi-monthly inspections and maintenance on our unit. They do cleanings on the outside unit without shutting us down. The only time it has been completely powered off was to replace a faulty blower belt. Other than that, it has been on continuously since November 2007.

 

I don’t think these Lieberts are exactly rocket science but I have not found that the average HVAC person really understands how they work.

 

--
Ron Parker, Director of Information Technology, Brazosport College
Voice: (979) 230-3480            

http://www.brazosport.edu

 

 

 

From: The EDUCAUSE CIO Constituent Group Listserv [mailto:CIO@LISTSERV.EDUCAUSE.EDU] On Behalf Of John Davis
Sent: Tuesday, April 17, 2012 2:06 PM
To: CIO@LISTSERV.EDUCAUSE.EDU
Subject: Re: [CIO] Liebert Cooling

 


I guess I was not clear on the Liebert unit.  First, we only have one Liebert unit.  It has 2 compressors in the inside unit.  The outside unit has 3 fans.  So, the question is about cutting one of the fans off to clean the coils while the other fans continue to run.

Our big problem is we need to find another Liebert certified company to do maintenance.

Thanks

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  John R. Davis  <davisj@marietta.edu>
  Chief Information Officer
  Marietta College
  215 Fifth St.
  Marietta, OH  45750
  Voice: 740-376-4390
  Fax:   740-376-4812
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 

From: "Marty Ringle" <ringle@REED.EDU>
To: CIO@LISTSERV.EDUCAUSE.EDU
Sent: Tuesday, April 17, 2012 2:47:33 PM
Subject: Re: [CIO] Liebert Cooling

John-

 

Your instincts are correct.  We have dual Lieberts for all of our machine rooms.  We run them as you suggest in a "lead-lag" sequence and we have auto-failover so if one quits the other will kick in when the ambient temperature rises to the necessary set point.  As for the compressors:  we have a single outside compressor for each interior unit and yes, we can bring either system down for maintenance or repair while we run the other one (though we have to override the auto-failover when we do this).

 

Marty

=================================

Martin Ringle, Chief Technology Officer   

Reed College, Portland, OR 97202          

503-777-7254   email:   ringle@reed.edu                             

=================================

 

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