Instead of the 4 separate videos on Vacuum & Evacuation, we've combined them into one so you can grab a beer and some popcorn and enjoy 1 hour and 15 minutes of Jim Bergmann love.
I’m glad to hear you mentioned using copper lines as vacuum hose because that’s exactly what my dad taught me when I was 12 years old and that was 40 years ago. And my dad was taught that when he was a young man so this is nothing new it is old technology taught by the masters who died long ago. Thank you Jim Bergman for putting in all your hard time and effort to re-educate a trade that lost its education decades ago.
What a public service to HVAC & MVAC professionals 👏🏽👏🏽👏🏽👏🏽. Thank you Jim! You are a wealth of knowledge and we all benefit from this and thank you 🙏🏾
I’m mostly learning auto systems right now but most of the car air videos are crap. This is where you go to really learn stuff. Very good, I may have to watch it two or three times but excellent stuff. Gets your head screwed on straight when it comes to vacuums and evacuating systems.
One of the smartest thing I've done in equipment procurement was purchasing a two hose Tru Blu kit! Unbelievable what it does to your evac time and makes a great carry case for all of your adaptors and fittings!
Excellent video as usual. That said, I found one small discrepancy that would benefit from some clarification. At approx. 1:08 in the video Jim states that techs should “always” attach the micron gauge on the liquid/discharge/high side of the system in an effort to minimize any potential for contamination of the vacuum gauge. However earlier in the video (at approx. 1:02) it shows the micron gauge connected to the 7/8-inch copper line on the suction/vapor/low side of evaporator coil. In fact, Jim states that the micron gauge is _“hooked-up at the evaporator coil right at the outlet of the evaporator…” Jim's explanation that follows at approx. 1:08 in the video indicates that connecting the micron gauge to the suction/vapor/low side service port (or evaporator coil and after the accumulator if present,) would help mitigate the potential for gauge contamination. Likewise, my understanding is that the best place to locate the micron gauge is at the service port on the suction/vapor/low side of evaporator coil when a vacuum hose is connected to the service ports on both the liquid/discharge/high side and suction/vapor/low side ports and the liquid/discharge/high side port when using a single vacuum hose connected to the suction port. (By the way, when using vacuum hoses connected to both high and low side service ports, Craig Migliaccio connects the micron gauge to the suction/vapor/low side as shown in this video.)
I've been a service tech for 16 years , nobody ever told me to loosen the ballast when you start the pump and close the ballast around 2000 microns for a deeper vac . Education
@@kylestan2250 tbh standard hand tools where the service techs only responsibility prior to me moving to commercial refrigeration. I didn't own my own pump , analyzer, digital Manifold, vacuum rig , hoisting gear or propress. Now that im competing for the best calls with other seasoned techs . I need better gear then they have so I can't depend of the employer
@@mikepict9011 I don't know, as the safety guy I had a copy of all powered equipment with the equipment and had all who used the equipment sign a log stating that the manual was read and understood.
@Sovereign-WV Citizen after testing ..i barely do it . And ductwork well done is a whole different trade then service . Full techs kinda should be hacks with tin . Because time / value / knowledge. Its worthy of a specialist. Pay for one
@ 39 Minutes, I totally agree with him on the oil, but would like to say one thing, if you go from job to job just installing small splits and relatevely clean systems (no brazing) short pipe runs the pump definitely doesn't need to be changed every time, however I have pulled a system that I changed over 5 times in a single pull down...
Good Evening Everyone, I was able to locate a copy of the book “Review of Vacuum for Service Engineers 1959” There is a copy located at The Linda Hall Library in Kansas City, Missouri. They wouldn’t loan it outside of North America so I created an online account with the library, and I was able to purchase a scanned copy of the book. Can’t wait to start reading it!
Another thought, based on the theory, we should probably take off those OEM small adapter(s) or fittings on the vacuum pumps, and use a bigger one that matches a big hose, which further matches the pump’s CFM. this should further improve efficiency!
Awesome video I wonder if you could discuss in the future how to best deal with a system repair where you have refrigerant that needs to be removed to vacuum levels prior to recharge. I have had a frustrating time on repairs due to residual refrigerant in the system. Hard to tell if you have a leak vs rise due r22 or r410 still in the compressor. An example of a rise curve may be a nice visual. Also recomendations as to how to rid all of the refrigerant from compressor and its oil. I generally will pull down several times with a long nitro sweep between Thanks
And there I was thinking I was that able. I am into MACS but the principles still apply. I will start to correct my errors and improve my quality of service delivery
as the vacuuming just starts there is a lot of air to move and smaller hoses will be a restriction . but then as vacuum goes deeper there's almost no air to move and size of the hoses doesn't matter
I watched the whole thing, great video and explanation! I just got my second TruBlue hose, I'm waiting for my BluVac gauge to come back from repair, then I'm going to do another video to show the speed increase. How much speed am I losing by using the XL hose vs the standard? (1m vs 1.5m)
Best thing I can say is 10-15 mins less then using 2 1.5m hoses. I always try to get the 1m but working on commercial sometimes it’s a pain in the butt. But knowing that you also work in walk in coolers etc they have easier access. But on RTU etc it just depends KEEP UP your videos Rick 👌👍💯
Amazing video with wery well documented information and very well presented. I got two full A4 pages of notes :D But I have some add-ins: -How the zone of lower pressure is created? Not by removing air from the system?! The inlet of a pump is also called suction or aspiration. From my point of view, we have a flow. The reason why water from the bottom of the tank is not driven out by the flow is because it is not in the way of the flow and even if it was, the flow rate is to small to move it. -Vacuum pumps are volumetric type pumps. -I don't know about that conductance thingy.. What I now is that flow is determined by section and difference in pressure. At the same pressure difference we will have different flow rates at different sections. And the increase is not linear. On vacuum, since the pressure in the system drops, also the maximum possible difference in pressure drops, therefore, the flow drops. This is why the difference in section matter so much when pulling vacuum. This might be another way of explaining why bigger hoses have better flow. This aspect did not cross my mind until I saw this video. Didn't think that hose section count so much when pulling vacuum. -What I know of regular pressure hoses is that the ineer rubber part holds the fluid, then there is the mesh that prevent expanding due to pressure and the exterior layer is for the mesh protection. The issue is the mesh is designed to hold pressure and it will collapse under the vacuum, decreasing even more the section, therefore, the flow. As as disclaimer: I'm just a young guy that it's not satisfied how split unit AC was installed :D and start digging the internet about how it's properly done :D
Thanks alot for all this great information. Would you be able to direct me as to how I could get a copy of "Review of Vacuum for Service Engineers 1959". I can't find it anywhere. Would I also be able to have a copy of the powerpoint presentation you used in the video as I would like to study it. Again thanks for the great information.
Few people know any more the purpose of pulling a vacuum. Do you know why? Its to remove moisture, moisture/water boils when under a vacuum @80° one needs 29 inches HG Vacuum, at 104° it's 27.75 inches of Vacuum.
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Dear if vacuum is not good and refrigerant R134a is charged in chiller.so as we know that if vacuum is not good so chiller pressure will increase. So After this how we remove moisture from refrigerant??
"Specific volume is inversely proportional to density. If the density of a substance doubles, its specific volume, as expressed in the same base units, is cut in half. If the density drops to 1/10 its former value, the specific volume, as expressed in the same base units, increases by a factor of 10. The density of gases changes with even slight variations in temperature, while densities of liquid and solids, which are generally thought of as incompressible, will change very little. Specific volume is the inverse of the density of a substance; therefore, careful consideration must be taken account when dealing with situations that involve gases. Small changes in temperature will have a noticeable effect on specific volumes."
The problem is gravity obviously has no effect on gasses! take helium for example! it goes up doesn't it. and gas pressure must be contained from the very start. I love your content,but natural law cannot be broken
@@measureQuick youre joking right? Chat board where someone makes a claim unsupported by any evidence whatso ever. I Need backing by scientific experiment independent, dependant and control vaiables. Besides the bending and warping of space time is only a concept.
Ronnie, if gravity did not have an effect on gasses we would not have an atmosphere. Gasses have mass, energy, specific gravity etc. If someone told you otherwise they are wrong.
