Results 1 to 11 of 11
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15-06-2004, 07:09 PM #1
Mineral to Polyolester Oil Systems - Clean up?
I have come across a few system which have become restricted by oil gelling on the liquid line due to "incomplete" refrigerant/oil retrofits. I am aware the maximum mineral oil content in a changed over poe system should not exceed 5%, otherwise gelling of the oil will occur, however, is there a preferred method of cleaning up this gel? Your input on this matter would be greatly appreciated!
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15-06-2004, 08:32 PM #2
Re: Mineral to Polyolester Oil Systems - Clean up?
Hi,mecassa
One option is draining the oil from the various components but this is not allways practical.
second is to reclaim the old refrigerant/oil,add the correct charge of replacement oil,recharge with the reclaimed refrigerant and restore operation.The refrigerant will then mix the old oil into solution with the new oil.
After running for a day or so a appropriate compressor drier,oil, filter change is required, this process will need to be done until the oil contaminants level drops to an acceptable level.
I will be interested to hear other peoples methods after doing several R12 retrofits a while ago it took several oil changes. this method obviously cannot be done with every retrofit.
Hope this helps.
Best regards MarkLast edited by Mark; 15-06-2004 at 09:41 PM.
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15-06-2004, 08:43 PM #3
Re: Mineral to Polyolester Oil Systems - Clean up?
Excuse my ignorance mark but how do you tell when the oil contaminents drop to an acceptable level?
I haven't done many change overs so I'm up for learning
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15-06-2004, 08:58 PM #4
Re: Mineral to Polyolester Oil Systems - Clean up?
Cant remember where the test kit came from frank
A Refractometer does the same apparently,i havent used one of these though .........yet
Refractometer
Best regards MarkLast edited by Mark; 15-06-2004 at 09:57 PM.
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15-06-2004, 10:03 PM #5
Re: Mineral to Polyolester Oil Systems - Clean up?
Any good refrigeration wholesaler will supply you with test kits. A good few years back I retrofitted a ransco cascade system from R13 to R23. I changed the oil charge 7 times until it got below 4% on the test kit, I still experienced the "black goo" sticking on the tev filters. The only cure I found was very regular maintainance checks including 6 monthly oil and filter changes. On complex kit chemical clean ups can be very expensive and time consuming. dill.
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15-06-2004, 10:08 PM #6
Re: Mineral to Polyolester Oil Systems - Clean up?
Any good refrigeration wholesaler will supply you with test kits.
Best regards MarkLast edited by Mark; 15-06-2004 at 10:11 PM.
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15-06-2004, 11:31 PM #7
Re: Mineral to Polyolester Oil Systems - Clean up?
mark, I got my kits from RPW MANCHESTER, but if you have any trouble try the web, there are tons of sites listing refrigerant oil test kits. I know at the moment the wholesalers are up "the wall" buying each other out and closing depots down. It's some time since I bought any but I can't see it being a problem obtaining these kits. Regards dill.
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16-06-2004, 12:03 AM #8
Re: Mineral to Polyolester Oil Systems - Clean up?
Hi Guysm
Dont like to sound pesermisic at all but usually its not worth the hassle. Work out the labour charges to keep coming back, reclaiming, fit new drier & oil, Vac out and regas not to mention the cost of the oil,driers & gas. It would have to be a large system to really make it worth it. Otherwise condemn it
Regards
Raymond
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16-06-2004, 12:49 AM #9
Re: Mineral to Polyolester Oil Systems - Clean up?
Hi Guys,
Just for info, at the moment the only supplier that i can find that sells Refractometers is HRP Pt No 178799 £380 Retail.
NRS will do a test for you at £75 a time (BARGAIN)
Regards
Raymond
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16-06-2004, 12:44 PM #10
Re: Mineral to Polyolester Oil Systems - Clean up?
Hi mecassa,
The agent I'm using for a long time is called R-141b, you can read about it here:http://www.atofinachemicals.com/msds/436.pdf
The way I do it, is disconnecting the compressor tubes and the reciver. and the TEV.
Flush the system at least twice. Replace compressor and reciver and you have a clean shiny unit ( inside) ready for any refrigerant.
A bit expensive but fantastic results.
Chemi
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16-06-2004, 06:44 PM #11
Re: Mineral to Polyolester Oil Systems - Clean up?
Hi,dill
Cant find it in my RPW catalogue ,do you have a part number.
Best regards Mark
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