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You can’t get enough pressure even holding your thumb over the line to move oil out of the line sets. Oil doesn’t move that easily. However that’s really not the problem. The amount of mineral oil left in the line set isn’t that big of a deal. It doesn’t effect the misabilty of the new oil significantly. I’m not system don’t try to get some of it out if the lines are staying. But you’re not getting it all. The real problem is mineral oil is carbon based and the new oil acts like a stripper and cleans the carbon deposits off the inside of the line set and washes the old crud of the old lines into the new system. You don’t really want crud and acids from a burnt out compressor in the new system. Chances are the flush starts when the new unit is installed on the old lines. Personally, if it only cost $500 to change the lines; I’d start fresh. Money well spent IHMO.

The young service rep looks very helpful in the video, would love to be his friend in real life. Would recommend accutemp generators just based off this video

Don’t flush replace

Great Company Image!!!

Super!!!

Purging with nitrogen when brazing should become the law of the land, as well as installing filter/dryer......Too many scrupulous contractors cutting corners at the expense of homeowners.

Excellent job explaining how a true HVAC technician does his work.

Am I the only one who didn’t get to see the rest of the video?

Sheeyt try 1400

Thank you, a good explanation of nitrogen purging in clear and simple language

Aren’t you supposed to have different copper line set sizes?

thought you were going to show us how it is done, do not particullarly care that your company is doing it the correct way as mine was improperly (compressor/drier) installed as no purge, vacuum) was ever performed.

How do you connect pre-charged lines so you don't need to purge them?

flow 3~6 psi of nitrogen while brazing to solve problems 5+ years down the road. The video tells you how important it is to flow nitrogen into the line set while brazing. Video no give any solution.

Great video. Nice, clear explanation for a layperson like me. Thanks a bunch.

Not even trying to show the job, but too much blaaablaaablaaa with advertising and telling the things that most of HVAC-R's know.

For the ordinary mini split AC's 1ton/1.5/2ton etc - you think nitrogen purging is needed?

This was basically a commercial and not an instructional video.

Very good job explaining nitrogen flow brazing which is very accurate, older refrigerant r22 does not scrub the system, new refrigerant 410a for example does which makes it more important to nitrogen flow during brazing. The title of the video was nitrogen purge which is done to clear the line of outside air which would contaminate the refrigerant

Little nugget of info on why you do this: Copper will oxidize at room temperature, hence the statue of liberty turning green, but the rate of oxidation is drastically improved at higher temperatures. If there is any oxygen inside the tubing, there will be oxidation on the inner wall (that black stuff that flakes off) when brazing. This is not good. That's why its necessary to replace the oxygen inside the tubing with nitrogen.

I came here from the thumbline 😳

First like

Idk I’m just a kid

I see that ur flushing from liquid line to evaporator out to suction side,,,,so u do not cut lines from evap and flush from inside house down?

Finally some truth about the Nitrogen flow during brazing. I called so many companies to install my unit and none told me they use nitrogen. Pissed me off. Everyone out there acts like an AC tech but in reality they suck

What brand/model purging regulator are you using?

This is a nicely explained video. However, the title is unintentionally misleading. I'm working on my car's A/C and trying to find information on purging with nitrogen. This video doesn't explain how to do it or why it's important for a car A/C (no brazed or soldered lines). You should add something to the title to make that clear. Good video though and informative!

Is it important to purge if no brazing is done? I'm curious because I'm installing a mini split heat pump that is pre charged.

Thanks sir. Well understood. Thank you so much

yet the pipe work isn't straight or fixed to the wall !

This is a very good, clearly articulated explanation on the importance of nitrogen purging.

Is nitrogen system the most important scope in plant utilities and maintenance?

Good job Joshua and AccuTemp! As a representative of a major HVAC manufacturer, we cannot overstate the importance of proper nitrogen purging during copper brazing. If we use nitrogen purging during the manufacturing process, doesn't it make sense that the installing contractor do the same? This is one discipline that separates the boys and girls from the men and women in our profession. To accentuate your message, I suggest your viewers watch the linked video. It's an oldie, but a goodie. ruclips.net/video/3uP-eb8Zz08/видео.html

how many guys