| [GMCnet] Pulling a Vacuum [message #134463] |
Wed, 13 July 2011 11:20  |
Gary Berry
Messages: 1002
Registered: May 2005
Karma: -1
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Senior Member |
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Hey;
A couple of questions. Do we need to pull a vacuum on the AC system
when using Duracool? What physical problems might be expected if you
don't pull a vacuum on a system that has been exposed to air for say a
couple of months? I replaced the dryer on my AC system and managed to
mung up the threads on one of the big lines. Realized it after I had
pumped 4 cans of Duracool into it when I saw oil all over the place.
Removed the new dryer and reinstalled the old one (it had been sitting
out in the weather for about a month), Added 2-1/2 cans of Duracool
and it's cooling like crazy. What are any long term effects or
problems?
--
Gary and Diana Berry
73 CL Stretch in Wa.
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| Re: [GMCnet] Pulling a Vacuum [message #134473 is a reply to message #134463] |
Wed, 13 July 2011 13:42  |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Air is a non condensible which means just that it doesn't condense causing higher head pressure. If you are cooling good you are most likely Ok I wouldn't worry as long as you didn't soak up a bunch of that Wa state water in the dryer.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Pulling a Vacuum [message #134500 is a reply to message #134463] |
Wed, 13 July 2011 19:00 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Gary Berry wrote on Wed, 13 July 2011 12:20 |
Hey;
A couple of questions. Do we need to pull a vacuum on the AC system when using Duracool? What physical problems might be expected if you don't pull a vacuum on a system that has been exposed to air for say a couple of months? I replaced the dryer on my AC system and managed to mung up the threads on one of the big lines. Realized it after I had pumped 4 cans of Duracool into it when I saw oil all over the place.
Removed the new dryer and reinstalled the old one (it had been sitting out in the weather for about a month), Added 2-1/2 cans of Duracool and it's cooling like crazy. What are any long term effects or problems?
--
Gary and Diana Berry
73 CL Stretch in Wa.
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Gary,
The evacuation serves two purposes, One is to remove water/moisture from the system, The other is to remove non-condensiable gasses from the system.
Corrosion in the system can destroy the effectiveness of the compressor in relatively order. Just like the light rust on a cylinder bore.
If it is working well now, then there is not enough moisture in the system to mess things up. Run it until you can replace the dryer. If you replace the dryer while blowing refrigerant through the system (gently) there is no reason to re-evacuate.
The problem is that if the dryer is at its moisture limit, you can have enough in the system to do damage when it is idle. If you replace the dryer (30$ at NAPA) at your next opportunity, the chance of saving the cost of the dryer is pretty good.
Do you have access to a sensitive scale or balance? Keep the plugs from the replacement. Weight the old one then put it in a 250* oven for an hour. Pull it out and weight it again. They can hold about 10 grams of moisture (IIRC). Keep up the process until the weight ceases to decline. Then put the left over plugs in it and put it in your spare parts collection.
Why didn't you do this with that part and put it back in?? ?
Because you would have had to leave the system open too long to do that and that is just never a good idea.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Pulling a Vacuum [message #134525 is a reply to message #134516] |
Wed, 13 July 2011 21:28 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Bdub,
Here's some info on the PLSS the Apollo Astronauts wore:
http://next.nasa.gov/alsj/plss.html
By the way the painted cutaway was built by a fellow PlSS tech; Max Kandler,
and me. I did most of the cutaway work and Max did the painting, it's candy
apple paint!
Here's a bit more info on it.
http://en.wikipedia.org/wiki/Primary_Life_Support_System
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Billy Massey
Sent: Thursday, 14 July 2011 12:00 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Pulling a Vacuum
Wow! This is fun! This has always been a black art to me and it's
fun to learn how it all works.
Thanks guys!
bdub (student in training)
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Pulling a Vacuum [message #134566 is a reply to message #134562] |
Thu, 14 July 2011 09:26 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Charles,
Hey, I don't remember meeting you, did you work for Hamilton Standard or
Nasa? At JSC or KSC?
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Charles Wood
Sent: Thursday, 14 July 2011 11:43 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Pulling a Vacuum
...fellow PLSS tech...
I have the saame keyboard
CBWood
77 Kingslay
MWC OK
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Pulling a Vacuum [message #134712 is a reply to message #134633] |
Fri, 15 July 2011 11:21 |
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cbwoodsr
Messages: 1063
Registered: February 2004
Karma: 0
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Senior Member |
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The email I received had this..
<snip>
Here's some info on the PLSS the Apollo Astronauts wore:
http://next.nasa.gov/alsj/plss.html
By the way the painted cutaway was built by a fellow PlSS tech; Max Kandler,
and me. I did most of the cutaway work and Max did the painting, it's candy
apple paint!
</snip>
cant tell if thats a '1' of a lowercase L..
FWIW..
CBWood
77 Kingslay
MWC OK
ONLINE PARTS PROGRAM
www.GMCMHParts.com
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