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Post by allan on Mar 24, 2015 2:37:28 GMT
![](//storage.proboards.com/5399178/thumbnailer/AozQfQPTm4XWE5qqqjHp.jpg) At jbind.com.
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Post by allan on Mar 24, 2015 2:40:10 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. Will keep you posted. It now has 2 pounds and 4 ounces and I have learned to give it a few days to settle out before adjusting. So thankful to jhigdon for pioneering the CA cap tube!
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Post by coldspaces on Mar 24, 2015 2:49:11 GMT
Quote from JB PDF "There are many evacuation level recommendations including the statement “evacuate the system to below 200 microns.” This should not be considered. Note we say “system” because it is possible to evacuate piping or some component other than the compressor to below this level. Refrigeration oil has a vapor pressure and by going below 200 microns, you will degas particles of the refrigeration oil. By changing the makeup of the oil, it will no longer be a true lubricating oil."
So it may be possible to go too low but I had always been told that the oil will start to vaporize at 250 microns and you will never pull lower than that in the field. Wish they went into more detail on just what particles gas out of the oil.
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Post by ChrisJ on Mar 24, 2015 12:31:03 GMT
And yet, this is on their website as an FAQ now. Attachments:![](//storage.proboards.com/5399178/thumbnailer/5lqc9rPiF04RXZtmAlhc.JPG)
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Post by allan on Mar 25, 2015 2:55:26 GMT
Insulated the top today with spray foam. It really makes a good job and assures no moisture will ever accumulate on the evap plate. It also provides the best possible thermal barrier between the compressor and the refrigerator box. Made new gaskets for top and cabinet. Started up and so far all is good with good starting and no rattles at all! The condenser and the float tank is nice and warm and the compressor dome seems to be slightly cooler than the condenser, which I think is a good thing! After about 1.75 hours after first starting it has settled down to the following: Room temp 74 degrees Box temp 38 degrees Evap on temp 23 degrees Evap off temp 11 degrees Run time 4 Off time 10 minutes Run amps 2.25 Charge 2 pounds and 4 ounces of MF 40 inches of .028 capillary tube
Both header tanks are completely frosted but vapor line is only cool so flooding should not be an issue. At least the high liquid level is clearing the excess oil that may have been in the evap and returning it to the pump. Will start adjusting the charge a bit lower tomorrow and get the box much colder.
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Post by cablehack on Mar 25, 2015 3:34:11 GMT
Most interesting. The cycling times are more like that of a CA-2. My CA-1 runs for about 2.5 mins, then off for 12-16 mins depending on room temp. This is with 90% charge. I should point out, that's with a capillary tube which was not optimised for 50 cycle use. As this was my first cap tube conversion, I didn't think about the lower compressor speed. So, I will be very interested to know how your final results compare.
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Post by allan on Mar 25, 2015 4:03:28 GMT
Most interesting. The cycling times are more like that of a CA-2. My CA-1 runs for about 2.5 mins, then off for 12-16 mins depending on room temp. This is with 90% charge. I should point out, that's with a capillary tube which was not optimised for 50 cycle use. As this was my first cap tube conversion, I didn't think about the lower compressor speed. So, I will be very interested to know how your final results compare. I will keep you posted on the performance. So far this is the best sounding CA compressor I have dealt with. Isn't you machine a form B?
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Post by cablehack on Mar 25, 2015 4:40:15 GMT
Isn't you machine a form B? Yes, both are form B's.
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alex
New Member
Posts: 44
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Post by alex on Mar 31, 2015 3:31:57 GMT
Allan, I am really impressed with what you have done with this unit from Milwaukee!
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