[labnetwork] Harkris Chiller Quality issues

[Paolini, Steven]

Patrick,
     As ironic as this may sound, my three older (2002-2005) Haskris chillers are the most reliable units that we have! I always liked these because there are no proprietary components in them. Most anything in these units can be purchased off the shelf from an industrial supplier. The older units always had Copeland compressors which can be found in 75% of all commercial coolers and air conditioners. I don’t know how the new ones are set up and if they are trying to cut costs but the water pumps are generally Procon with a GE motor coupled by a sacrificial brass “spider”  It is critical that these two components are properly aligned but if they aren’t, the brass spider wears prematurely before stressing the pump shaft out of true and thus creating a seal leak. I must ask you what the PH of the recirculating water is and if you spike it with any additives. Distilled water is best for these units. Do NOT use DI.
  Steve Paolini
  Equipment Dood

Steve Paolini
Principal Equipment Engineer
Harvard University Center for Nanoscale Systems
11 Oxford St.
Cambridge, MA 02138
617- 496- 9816
spaolini at cns.fas.harvard.edu
www.cns.fas.harvard.edu

From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Johnson, Patrick
Sent: Thursday, January 11, 2018 9:44 AM
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] Harkris Chiller Quality issues

Good Morning All,  We purchased all new Haskris chillers both large and small in late 2014 and since the start up in early 2015 have had numerous failures, all of my  pumps started to leak at the input shaft seal, replacement pumps form Haskris have started to leak as well.
The most problematic has been the large R0300 Haskris air cooled and now one of the compressors just failed and we have to get repaired out of our pocket.   I'm interested to know if anyone else has had similar issues with there Haskris chillers.
Thanks   Patrick



Patrick Johnson
George Washington University
Nano Fabrication Lab Manager
Science and Engineering Hall
800 NW 22nd Street Rm-B2815
Washington D.C. 20052
Cell 703 258 2465
Desk 202 994 2346
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