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Post by allan on Mar 22, 2015 22:51:45 GMT
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Post by allan on Mar 22, 2015 22:56:18 GMT
Got it all sealed up today. It passed a 75# nitrogen pressure test so I am now vacuuming. Next I will pressurize with R22 and leak test with the GE H10 Leak Detector. Soldered up the service valve and added a new Mueller steel service valve piped into the top of the float tank. Also installed a temporary low side service valve. Will solder it up after charging is complete.
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Post by ChrisJ on Mar 22, 2015 23:54:22 GMT
Ah, that's definitely a rebuild serial number.
Why not try John Higdon's alternate refrigerant this time? What was he running, R123 I think?
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Post by allan on Mar 23, 2015 1:47:09 GMT
Ah, that's definitely a rebuild serial number. Why not try John Higdon's alternate refrigerant this time? What was he running, R123 I think? Going to stick with a fresh new modern dose of MF for this one! It just passed a leak test with the H10. Going to vacuum all night. It was on 580 microns when I left about an hour ago.
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Post by ChrisJ on Mar 23, 2015 2:13:47 GMT
Aren't you concerned about pulling too low of a vacuum and damaging the compressor oil?
I ask because JB's website used to warn about going below 300 microns, but now they don't so I don't know what's up with that.
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Post by coldspaces on Mar 23, 2015 13:07:48 GMT
Aren't you concerned about pulling too low of a vacuum and damaging the compressor oil? I ask because JB's website used to warn about going below 300 microns, but now they don't so I don't know what's up with that. Once again I have never been told that it is possible to damage the oil by vacuuming to long. I think that info is incorrect myself.
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Post by ChrisJ on Mar 23, 2015 13:57:43 GMT
Aren't you concerned about pulling too low of a vacuum and damaging the compressor oil? I ask because JB's website used to warn about going below 300 microns, but now they don't so I don't know what's up with that. Once again I have never been told that it is possible to damage the oil by vacuuming to long. I think that info is incorrect myself. Sorry
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Post by coldspaces on Mar 23, 2015 17:10:22 GMT
Once again I have never been told that it is possible to damage the oil by vacuuming to long. I think that info is incorrect myself. Sorry No need to be sorry I just never hear of it being a problem.
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Post by allan on Mar 24, 2015 1:35:57 GMT
Here is part of the instructions on The vacuum pump web site. They advise to stay above 200 microns. After an all night vacuum on the Soup Can it had a 300 micron reading. And it held there with no problem. Broke vac with nitrogen and then vacuumed another 8 hours. Weighed in the factory charge of fresh new MF
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Post by allan on Mar 24, 2015 1:42:27 GMT
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Post by allan on Mar 24, 2015 1:49:51 GMT
23 degree evap after less than 15 minutes run time on initial start up. Rubber hose above left tank is a conduit through the future spray foam for the thermostat capillary. Will then cut it off flush and add a plastic bushing to trim the hole. Second shot is the brazed up original service valve. Later sandblast and repaint will make it look good again
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Post by cablehack on Mar 24, 2015 2:17:44 GMT
It's great to see another CA freezing nicely again. I'll be interested to know what the cycling time is with the full charge. I had thought about adding more MF to my CA-2 in view of improving oil circulation, so I'm curious just how much this would reduce the off times.
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Post by ChrisJ on Mar 24, 2015 2:25:27 GMT
View AttachmentHere is part of the instructions on The vacuum pump web site. They advise to stay above 200 microns. After an all night vacuum on the Soup Can it had a 300 micron reading. And it held there with no problem. Broke vac with nitrogen and then vacuumed another 8 hours. Weighed in the factory charge of fresh new MF Is that JB's website? Their pumping FAQ now contradicts that.
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Post by ChrisJ on Mar 24, 2015 2:28:32 GMT
I think we calculated that my CA-2-A ended up with a little over 3 pounds in it. I may have to bleed some off, but I just hope it doesn't cause any issues with slugging when I bring it home.
I forgot about it until just now.
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Post by allan on Mar 24, 2015 2:36:37 GMT
Here is part of the instructions on The vacuum pump web site. They advise to stay above 200 microns. After an all night vacuum on the Soup Can it had a 300 micron reading. And it held there with no problem. Broke vac with nitrogen and then vacuumed another 8 hours. Weighed in the factory charge of fresh new MF Is that JB's website? Their pumping FAQ now contradicts that. Yes it is at jbind.com. Will post a pic of the first page
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