10-07-09, 02:19 PM | #21 | |
Lex Parsimoniae
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pointed downwards (page 17). http://sanyohvac.com/assets/document..._72_Series.pdf I would still be worried about getting metal particles inside it. I was thinking maybe stuff some non-lint fabric up in there, to block the tube up, and then blow it out with a blast of dry air from the other end.?. I have two pipe cutters that I use for cutting copper water tubing. I think the smaller one might be good for this job. It's pretty sharp. At work, I use a super fine jeweler's saw and a fixture to cut off 0.141 OD hardline coax cable. That will be my backup method, if my small tube cutter fails to perform. I can make fixture blocks on my Chinese mill. The manual says "the ideal (or target) vacuum condition is around 10 mmHg abs." (What does that equal to? Is that 10 Torr? (10 Torr=10,000 Micron?).. That MasterCool pump does 75 Microns. Will that do the job?? Mastercool Inc., Vacuum Pumps |
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10-07-09, 05:30 PM | #22 | ||||
Supreme EcoRenovator
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But remember to change the vacuum pump oil just before you do a pump-down. By design, vacuum pump oil absorbs atmospheric water. Even though your vacuum pump has never been used, it's been sitting and absorbing atmospheric water. Change the oil. My friend, Bruce-the-Pirate bought a two gallon jug of vacuum oil for some kind of low price. Big mistake. Every time he opens the jug, he's introducing more atmospheric water. Personally I would throw the jug away. But he wears an eye patch and will probably use it anyway. Buy a small one-shot or two-shot bottle and don't open it until you're ready to use it. I bought a small plastic two-shot bottle, used half of it, capped the bottle tightly back up and left it on the shelf for a couple of weeks. Now the sides are all caved in because the oil has been sucking the moisture out of the air that was trapped inside the bottle. Pretty amazing. You want that kind of oil to be working for you! Regards, -AC_Hacker P.S.: And remember, I'm not an HVAC technician. In fact, I'm just barely a hacker. %%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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10-07-09, 06:04 PM | #23 |
Lex Parsimoniae
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I saw this one on Ebay.. JB DV-22N DV-24N Digital Vacuum Micron Gauge with Case - eBay (item 300353500817 end time Oct-09-09 18:03:08 PDT)
Looks like a nice unit.. 20 to 9000 Microns, What do you think? And, I have a printout of that table right here, but I still didn't know if I was reading it right.. Until I looked up "Hg" and found it's the modern chemical symbol for mercury.. LOL!! I'm so forgetful these days! Or, maybe I never knew that! I might end up needing to cut off about 4 feet of line-set, and that tech guy at Ductless HVAC Supply also advised me to practice on the extra cable. He said after you do about 10 flares, you will likely do a better job than some AC tech who is in a hurry.. Re: malleable stuff That tech guy also said I could use a 45 degree flare tool. He said when you tighten down the nuts real good, it will come down to 37 degs without a hitch. Just loosen and re-tighten to normal pressure afterwards. No probleMoe.. I expressed some doubts and he assured me it works, because the tubing is so malleable.. What do you think? Yeah, I know you are a hacker like me. But, I also know that a lot of the Experts I've seen aren't always doing and expert job.. |
10-07-09, 06:22 PM | #24 | ||
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Mine cost me about $137, bought it from a local supplier. If you can get that one for less, you are that much further ahead. Quote:
I do know that copper is very forgiving. Best Regards, -AC_Hacker %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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10-08-09, 12:33 AM | #25 |
Supreme EcoRenovator
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Here's a link to the assembly lube I used.
http://refrig.com/Product/Sealants/N...ylog_blue.html This is the stuff they referred to as 'snot'. Regards, -AC_Hacker |
10-08-09, 02:40 PM | #26 | |
Lex Parsimoniae
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It looks like just the stuff I need. May have to get it on-line, since these distributorships don't like selling stuff to DIYers. Anyways, are your Sanyo flare nuts metric or SAE?? Since I'm thinking of ordering a kit of 3/8 size flare nut crowfeet.. |
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10-09-09, 02:59 PM | #27 |
Lex Parsimoniae
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Wow! I've got to read more.. Just found out about the time required to dehydrate your system
takes longer if it's cold out.. Refrigeration Vacuum Pumps Really shows the need for a good vac meter. It's 60 here today, so it would take 36 hours! Wow.. Longer than I expected. How does the HVAC tech do these Mini-Split Install jobs and turn on the system in just a few hours??? |
10-09-09, 03:26 PM | #28 |
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10-09-09, 04:32 PM | #29 |
Lex Parsimoniae
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10-11-09, 06:00 AM | #30 |
Lex Parsimoniae
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Found a place locally that sells this 2-stage pump..
Robinair 15150 Vacuum Pump, 1.5 CFM, Two Stage, 110V Robinair 15150, 15300, and 15500 1.5, 3, and 5 CFM VacuMaster Vacuum Pump - on Sale at the Test Equipment Depot They have a pretty good price, even with the taxes.. |
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air conditioner, diy, heat pump |
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