| Duracool, how much oil? [message #261204] |
Sun, 07 September 2014 15:57  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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You may remember I just redid my AC only to have the high pressure line get intimate and friendly with the AC pulley dumping all my hard work on the ground.
I now have a shiny new hose, a new dryer and I have drained the compressor ( the new aluminum one from Jim K )
It's getting Duracool, I need 3.5 cans since it has an Aux unit under the couch.
The question is oil.. how much?
Do I base the oil charge on home much r134 it would have used? (3lb 9 oz ) or how much duracool it IS using? (1lb 7 oz)
I'm going with PAG 46 as thats what was in the compressor.
so confusing...
Thanks
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Duracool, how much oil? [message #261213 is a reply to message #261204] |
Sun, 07 September 2014 16:40  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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1. When you replaced the compressor did you completely flush the exaporator and condensor? If not, then did you have the original mineral in the system ? If so then you should not use PAG-46in the compressor. When I got the compressor from Kanomata I drained it and replaced the oil with mineral oil.
2. Don't assume that you will necessarily need 3-1/2 cans of Duracool just because you have added an aux. evaporator.
My original system took a little less than 3 cans. When I added my 18.000 btu aux evaporator it toon 3 cans. The evaporator fills with vapor, not liquid it doesn't take very much liquid to make a large volume of vapor -- which is why I only needed 3 cans total
Emery Stora
77 Kingsley
Frederick, CO
> On Sep 7, 2014, at 4:57 PM, Keith V wrote:
>
> You may remember I just redid my AC only to have the high pressure line get intimate and friendly with the AC pulley dumping all my hard work on the
> ground.
>
> I now have a shiny new hose, a new dryer and I have drained the compressor ( the new aluminum one from Jim K )
>
> It's getting Duracool, I need 3.5 cans since it has an Aux unit under the couch.
>
> The question is oil.. how much?
> Do I base the oil charge on home much r134 it would have used? (3lb 9 oz ) or how much duracool it IS using? (1lb 7 oz)
> I'm going with PAG 46 as thats what was in the compressor.
>
> so confusing...
>
> Thanks
> --
> Keith
> 69 Vette
> 29 Dodge
> 75 Royale GMC
> Mounds View. MN
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Duracool, how much oil? [message #261214 is a reply to message #261213] |
Sun, 07 September 2014 17:17 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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emerystora wrote on Sun, 07 September 2014 16:401. When you replaced the compressor did you completely flush the exaporator and condensor? If not, then did you have the original mineral in the system ? If so then you should not use PAG-46in the compressor. When I got the compressor from Kanomata I drained it and replaced the oil with mineral oil.
2. Don't assume that you will necessarily need 3-1/2 cans of Duracool just because you have added an aux. evaporator.
My original system took a little less than 3 cans. When I added my 18.000 btu aux evaporator it toon 3 cans. The evaporator fills with vapor, not liquid it doesn't take very much liquid to make a large volume of vapor -- which is why I only needed 3 cans total
Emery Stora
77 Kingsley
Frederick, CO
Yes it was a complete flush.
took it all apart and changed the dryer.
This time i'll just change the dryer. it's cheap enough to seem worth it.
3 1/2 cans is what it took before to get 20 psi on the low side.
The mfr of the secondary evap says it takes 1 lb of 134,(7 oz of duracool)
so those numbers work perfectly in my opinion.
so the question is do I base the oil on the R134 charge? or the Duracool charge?
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Duracool, how much oil? [message #261247 is a reply to message #261214] |
Sun, 07 September 2014 21:40 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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The oil amount is based on the system size and components, not the refrigerant charge needed to obtain the correct pressure balance for best cooling performance.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Duracool, how much oil? [message #261284 is a reply to message #261247] |
Mon, 08 September 2014 08:43 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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The X7525 manual on page 1-61 at the bottom of the Checking Oil section gives the volumes of oil for the factory system, If you have an extra evaporator core you then you would add an addition amount for another evaporator. The values listed below assume that you have completely drained the system so there is no oil in the system and the compressor has also been completely drained.
Evaporator Core 3 fluid oz.
Condenser 1 fluid oz.
Receiver/Dehydrator 1 fluid oz.
Compressor 6 fluid oz.
Because I have never used R-134a in any of my coaches and I always have used the Wax Free mineral oil based refrigerant oil ( NAPA#209500). I have resisted using the synthetic PAG compressor oil. I would only use the PAG oil if during the rebuild of the system that all componets and hoses were completely flushed and blown out with flushing solvent and a new receiver/dryer with the newer XH-7 Desiccant (NAPA# 208508) which is compatible for both R-12 and R-134A was installed. Mixing the two types of oil can cause real issues with oil breakdown and plugging of the system.
Guys, if you don’t have the manuals for your coach, go to BDubs sites and download them for your year coach and also get the operators manuals for your years coach. The Parts manual gives a lot of views on how things are assembled or installed, good download too. They are available from:
http://www.bdub.net/factory-manuals.html
Or you can order them on a thumb drive at:
http://www.bdub.net/GMCers/index.html
or
http://www.gmcmi.com/new-member-offer/
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Sep 7, 2014, at 10:40 PM, Terry wrote:
> The oil amount is based on the system size and components, not the refrigerant charge needed to obtain the correct pressure balance for best cooling
> performance.
> --
> Terry Kelpien
> ASE Master Technician
> 73 Glacier 260
> Smithfield, Va.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Duracool, how much oil? [message #261286 is a reply to message #261284] |
Mon, 08 September 2014 09:24 |
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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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John,
You get a BIG ATTA BOY for taking the time to ferret this info out!
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of John Wright
Sent: Monday, September 08, 2014 8:43 AM
To: GMC Net
Subject: Re: [GMCnet] Duracool, how much oil?
The X7525 manual on page 1-61 at the bottom of the Checking Oil section gives the volumes of oil for the factory system, If you have
an extra evaporator core you then you would add an addition amount for another evaporator. The values listed below assume that you
have completely drained the system so there is no oil in the system and the compressor has also been completely drained.
Evaporator Core 3 fluid oz.
Condenser 1 fluid oz.
Receiver/Dehydrator 1 fluid oz.
Compressor 6 fluid oz.
Because I have never used R-134a in any of my coaches and I always have used the Wax Free mineral oil based refrigerant oil (
NAPA#209500). I have resisted using the synthetic PAG compressor oil. I would only use the PAG oil if during the rebuild of the
system that all componets and hoses were completely flushed and blown out with flushing solvent and a new receiver/dryer with the
newer XH-7 Desiccant (NAPA# 208508) which is compatible for both R-12 and R-134A was installed. Mixing the two types of oil can
cause real issues with oil breakdown and plugging of the system.
Guys, if you don't have the manuals for your coach, go to BDubs sites and download them for your year coach and also get the
operators manuals for your years coach. The Parts manual gives a lot of views on how things are assembled or installed, good
download too. They are available from:
http://www.bdub.net/factory-manuals.html
Or you can order them on a thumb drive at:
http://www.bdub.net/GMCers/index.html
or
http://www.gmcmi.com/new-member-offer/
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Sep 7, 2014, at 10:40 PM, Terry wrote:
> The oil amount is based on the system size and components, not the refrigerant charge needed to obtain the correct pressure
balance for best cooling
> performance.
> --
> Terry Kelpien
> ASE Master Technician
> 73 Glacier 260
> Smithfield, Va.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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] Duracool, how much oil? [message #261292 is a reply to message #261247] |
Mon, 08 September 2014 10:34 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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Bullitthead wrote on Sun, 07 September 2014 21:40The oil amount is based on the system size and components, not the refrigerant charge needed to obtain the correct pressure balance for best cooling performance.
Ahhh thanks Bullithead, thats what I expected but couldn't verify it anywhere.
The compressor says to use 17 to 20% of the R134 charge by weight of PAG46 which is a good way to judge system capacity 
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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