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Post by coldspaces on Apr 15, 2014 4:35:03 GMT
Recovered the so2 from this DR-2. Put the recovery tank in the freezer again last night and turned on the oil conditioner. Left it that way all night. By this morning the system was in a vacuum and all sounds of refrigerant boiling from the oil were gone. Tank gained 7 lbs 6 oz.
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Post by coldspaces on Apr 16, 2014 2:23:54 GMT
Well I cut the line below the float and could not blow any nitrogen through even if I manually lifted the float. Tried tapping on the line and float and more pressure up to 250 psig. Then I let the float drop back down and tried some more. In the end I had 435 psig pushing backwards through the float and still nothing. Then I started to hit the float chamber with more force and after a while the pressure started to drop some each time I hit it. It had finally broke loose but I did not realize it for sure till I manually lifted the float again and then it flowed right through. I couldn't believe that the float was able to stay shut with over 400 psig trying to push the needle open. Didn't think I would need to open it manually with that much back pressure against it. After splicing the line under the float I added a filter drier and pulled a vacuum. Then I recharged it with exactly 5 lbs of the recovered so2. It went in kinda slow at first till enough liquid got to the float to open it. After running just a short time it got much quieter, you wouldn't know it was locked up last week. Not sure how much oil was in the evap. I know there had to be some in the compressor because there was always enough oil pressure to make the unloader work. May have been mostly carboned up from working against too much hi pressure with the float blocked and apparently over charged. Not sure how much credit the Supco 88 can take for how quite and smooth it is now running since it was added before the blockage was cleared. I started it up at 4:00 pm today and it has been running non stop ever since. After 4 1/2 hours evap is fully frosted. Here is what she sounds like now. s556.photobucket.com/user/1stgenerationchevyII/media/MOV09061_zps5ed5617e.mp4.html?sort=3&o=0At the beginning there is a hiss that happens every once in a while. Not sure what causes it. Usually happens twice in a row and then the evap gurgles different shortly after. Might just be some vapor going though the float.
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Post by jhigdon2 on Apr 16, 2014 2:45:32 GMT
How's the cycle times ?
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Post by coldspaces on Apr 16, 2014 3:44:58 GMT
Never shuts off, I have no control. Not even setting in a cabinet. This unit had the control removed as it was seized. Travis still has it but we didn't expect to get it running, was only supposed to rob it of its so2. It is great experience for working on Travis's. I now know that the copper tube on the condenser is very hard to bend. Must not have been annealed that well back then maybe? Also learning what the pig may be supposed too sound like. Also now a Supco 88 and filter drier experiment.
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Post by jhigdon2 on Apr 16, 2014 3:57:00 GMT
Sounds like another DR has been saved.
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Post by Travis on Apr 16, 2014 4:38:18 GMT
Excellent work! You have no idea how many times I had almost thrown that one away.
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Post by coldspaces on Apr 16, 2014 4:54:38 GMT
Excellent work! You have no idea how many times I had almost thrown that one away. I am surprised at just how quiet it is. The video I linked does not do it justice. It is much quieter in person. Makes my 32 on 134a sound kinda loud. Who knows how much wear is really in this compressor. May have saved it for years and maybe not, who knows. If 5 lb charge is good on this DR then I still have enough left to recharge the ball top. Assuming I don't just leave it 134a.
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Post by Travis on Apr 16, 2014 6:12:04 GMT
DR's can be quiet when they're happy and the heater works. The DR3 you're working on was quiet. I would trade a little noise for something that works though.
I'll get the DR2 and the DRA2 out of the garage soon. We can compare. The DR2 is identical to that one you have.
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Post by allan on Apr 16, 2014 16:24:59 GMT
Recovered the so2 from this DR-2. Put the recovery tank in the freezer again last night and turned on the oil conditioner. Left it that way all night. By this morning the system was in a vacuum and all sounds of refrigerant boiling from the oil were gone. Tank gained 7 lbs 6 oz. Great recovery system! What is the nameplate charge amount?
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Post by allan on Apr 16, 2014 16:27:40 GMT
Well I cut the line below the float and could not blow any nitrogen through even if I manually lifted the float. Tried tapping on the line and float and more pressure up to 250 psig. Then I let the float drop back down and tried some more. In the end I had 435 psig pushing backwards through the float and still nothing. Then I started to hit the float chamber with more force and after a while the pressure started to drop some each time I hit it. It had finally broke loose but I did not realize it for sure till I manually lifted the float again and then it flowed right through. I couldn't believe that the float was able to stay shut with over 400 psig trying to push the needle open. Didn't think I would need to open it manually with that much back pressure against it. After splicing the line under the float I added a filter drier and pulled a vacuum. Then I recharged it with exactly 5 lbs of the recovered so2. It went in kinda slow at first till enough liquid got to the float to open it. After running just a short time it got much quieter, you wouldn't know it was locked up last week. Not sure how much oil was in the evap. I know there had to be some in the compressor because there was always enough oil pressure to make the unloader work. May have been mostly carboned up from working against too much hi pressure with the float blocked and apparently over charged. Not sure how much credit the Supco 88 can take for how quite and smooth it is now running since it was added before the blockage was cleared. I started it up at 4:00 pm today and it has been running non stop ever since. After 4 1/2 hours evap is fully frosted. Here is what she sounds like now. s556.photobucket.com/user/1stgenerationchevyII/media/MOV09061_zps5ed5617e.mp4.html?sort=3&o=0At the beginning there is a hiss that happens every once in a while. Not sure what causes it. Usually happens twice in a row and then the evap gurgles different shortly after. Might just be some vapor going though the float. I bet it is safe to say this is the first SO2 pumping monitor top with a liquid drier! I remember the patents said silica gel for SO2. Is that what is in this drier?
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Post by coldspaces on Apr 16, 2014 19:41:52 GMT
Well I cut the line below the float and could not blow any nitrogen through even if I manually lifted the float. Tried tapping on the line and float and more pressure up to 250 psig. Then I let the float drop back down and tried some more. In the end I had 435 psig pushing backwards through the float and still nothing. Then I started to hit the float chamber with more force and after a while the pressure started to drop some each time I hit it. It had finally broke loose but I did not realize it for sure till I manually lifted the float again and then it flowed right through. I couldn't believe that the float was able to stay shut with over 400 psig trying to push the needle open. Didn't think I would need to open it manually with that much back pressure against it. After splicing the line under the float I added a filter drier and pulled a vacuum. Then I recharged it with exactly 5 lbs of the recovered so2. It went in kinda slow at first till enough liquid got to the float to open it. After running just a short time it got much quieter, you wouldn't know it was locked up last week. Not sure how much oil was in the evap. I know there had to be some in the compressor because there was always enough oil pressure to make the unloader work. May have been mostly carboned up from working against too much hi pressure with the float blocked and apparently over charged. Not sure how much credit the Supco 88 can take for how quite and smooth it is now running since it was added before the blockage was cleared. I started it up at 4:00 pm today and it has been running non stop ever since. After 4 1/2 hours evap is fully frosted. Here is what she sounds like now. s556.photobucket.com/user/1stgenerationchevyII/media/MOV09061_zps5ed5617e.mp4.html?sort=3&o=0At the beginning there is a hiss that happens every once in a while. Not sure what causes it. Usually happens twice in a row and then the evap gurgles different shortly after. Might just be some vapor going though the float. I bet it is safe to say this is the first SO2 pumping monitor top with a liquid drier! I remember the patents said silica gel for SO2. Is that what is in this drier? I believe that 5 lbs is the charge stated in the manual for this unit. Can't read the model tag at all though. Travis also said it should be 5 lbs. I did get 7 lbs 6 oz out though. Either extra so2 was added in the past because the float seat was getting restricted. Or possibly the factory rebuild added more to be sure the pig returned the oil. Does anyone know if the amounts in the manual make up for some of the early units being undercharged when new?. Its a standard off the shelf drier it is a blend of molecular sieve and activated alumina. www.emersonclimate.com/Documents/FlowControls/pdf/systemprotectors/brochures/EK_Filter-Drier_White_Paper.pdf It is a bead type that is designed to keep the beads packed in place to they won't move and create dust. Also has extra filtration in the form of fiberglass to catch a lot of gunk before it plugs. Since this unit was scrap when I got it I figured I might as well try one with the alumina in it and see what happens, worst I can do is kill it again.
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Post by ChrisJ on Apr 16, 2014 20:06:16 GMT
It seems the DR and CKs main if not only weakness is that black crud clogging the float valve.
I think you may have created a monster by removing it's only weak point.
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Post by jhigdon2 on Apr 16, 2014 22:06:35 GMT
Refrigerant charge should be 6 or 6.75 lbs. Depending on model.
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Post by coldspaces on Apr 16, 2014 22:43:02 GMT
Refrigerant charge should be 6 or 6.75 lbs. Depending on model. Ok then it is under charged at 5 lbs. Wish I could read the tag.
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Post by Travis on Apr 16, 2014 23:15:30 GMT
I can look at the tag on the DR2 in my garage and let you know.
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