Results 1 to 6 of 6
Thread: Evacuation Procedures
-
05-04-2008, 04:55 PM #1
Evacuation Procedures
Hi everyone,
Im looking for advice for evacuation procedures for long piping runs on large commercial ductless equipment. Sizes of system range from 3 ton- 24 ton. I need all the information I can get. My background is in small equipment. I want my first experience of installation to go smooth. Thanks for any input you guys can give me.
-
06-04-2008, 12:05 AM #2
Re: Evacuation Procedures
Try searching this site for some of the many discussions on evacuation procedures.
Here's one to start with..
http://www.refrigeration-engineer.co...ght=evacuation
Basically a proper triple evacuation will get you off to a good start, exactly like your present method of working, we hopeBrian - Newton Abbot, Devon, UK
Retired March 2015
-
06-04-2008, 03:26 AM #3
Re: Evacuation Procedures
Use two vacuum pumps. One at each end of the system. Might make the evacuation go faster.
-
06-04-2008, 06:19 PM #4
Re: Evacuation Procedures
I agree with the triple evacuation. I also use the 1.5-2.0 psi OFN flow while brazing. I ve heard some discussion regarding making it faster in regards to gauge hoses being up-sized, schraders being removed. Any other tips you guys could give woulld help. Desired micron level? Ive been told 500 microns. Do you guys do a standing pressure test? Does it need to hold overnight? Thanks for the input!
-
06-04-2008, 06:23 PM #5
Re: Evacuation Procedures
Sounds like you got it about right to me.
If the pipes a purged with OFN and then a good tripple vac carried out you won't go far wrong.
As for the depth of vac I would aim for about 15torr first 10 torr second 4 torr last, the last vac should be as low as possible so aim for 2 torr.
I would advise regular checks of the vac pump oil and replacement at regular intervals as well.
Cheesr taz.Last edited by taz24; 06-04-2008 at 06:27 PM.
-
07-04-2008, 02:45 AM #6
Re: Evacuation Procedures
Thanks alot !
Similar Threads
-
Triple evacuation
By kpapa in forum FundamentalsReplies: 32Last Post: 22-02-2010, 10:35 PM -
Evacuation
By tadipatrir in forum FundamentalsReplies: 10Last Post: 14-09-2007, 11:56 PM -
Evacuation, How deep should it be?
By kengineering in forum Technical DiscussionsReplies: 13Last Post: 04-01-2006, 10:26 PM -
Burn out procedures
By reggie in forum FundamentalsReplies: 13Last Post: 22-01-2003, 06:06 PM