Agreeing that heat pump applications need below 200 and ideally 100microns, then when working on industrial size chillers, what vacuum/decay levels are desired?
Wow Wow Wow! It blew my mind when I realized that a boiler is refrigeration with R718 (water), moving the heat of the fire from some place where we don't want it to some place that we do. As we boil the water it increases its volume about 1600 times. The expansion pushes the steam to the radiators and once it subcools it falls back to the boiler. The same action is happening in the evaporator as it absorbs the heat it expands and pushes the superheated vapor toward the compressor massively increasing its velocity. I thought the compressor was doing all of the work! This leads me to another thought. I couldn't understand the pressure drop you get on some microchannel condensers, up to 35 psi. The microchannel tubes are acting like an orifice as the refrigerant condensed it takes up much less space and therefore there is a massive pressure drop on the liquid line. Drives me insane that so many manufactures don't put liquid line ports on their package units.
Bergmann and Spohn... the best of the best. HVAC is truly a lifelong practice. I'm 64 and still in the field and love what I do. However, it's frustrating reprogramming the technicians and installers under my wing to throw out the lies of their old, inadequate methods.
The over-reliance on apps and technology can sometimes lead to a passive approach to problem-solving, where individuals may forgo critical thinking or real-world experience. While these tools, like navigation apps, are convenient and useful as alternatives, they shouldn't replace our ability to understand, navigate, or think for ourselves. Just like with a GPS, knowing the basics and using common sense should always come first, while technology serves as a complement, not a substitute.
Question: does the elevation you're in have an impact on the calibration process? 😊 i bought a new bluvac+ pro which was asking for calibration right out of the box.
12:21 - What length of time is required to complete the purge of air on a two ton heat pump with a 50’ lineset? Also, in what position does the 4way valve need to be to get the proper purge before evacuating? 16:25 - That’s funny! “I’m _not_ a technician: I’m an HVAC/R Practitioner!” Thanks for the video, Y’all!
6:48 - Thanks for the warning (although, I should have already known this). My fixed MD unit does _not_ have a suction line accumulator, so I can’t just slam the cover back on with the system running without possible flood back.
7:36 - We still have Star Wars buffs! Gotta love ‘em! 17:43 - I would love to see a walkthrough of MQ for a walk-in box or RTU! Hope you can do one of those soon. This format of going through every step is very informative! Also, how to get back into a refrigeration unit I’ve already worked on without wasting more Qbits on it.
Nice work! Nice app. Would be nice if it could integrate with MQ for all the equipment/customer information and end up on the Pro Report for commissioning or a repair/retro commissioning.
Thank Jim for always throwing strikes! Looks like i have to re-download the app to get the updated 1.05 version from 1.02. The update did push through automatically. Thank you
I am following along and when I get to entered equipment, I select the one I want and it sends me into workflow. I can no longer see my projects. The name is no longer there and on the map it never updates location. I saved and refreshed and it’s not there. Very confusing. Gives me no way out of the cycle. I need to simply update my equipment with more info to my project and I can not find it.
Not sure why you say you cant clean the system up after acid, and who paid for the entire system changeout? The manufacturer wont, the guy who put it in wont. I will typically cut the system into 2 sections at the least,some package units/rtus,ect maybe more sections, and flush with rx11 as well as add a scavenger and honestly that has worked very well almost always,but ill still let that run for a few days then come back and replace the drier,refrigerant and add a small amount of scavanger for good luck on large systems. Ive gone back and tested to find no acid. It can be done.
@@HVACRTECH-83 it’s because of the system type. The metering device is in the outside unit and there is no line between the condenser outlet and the metering device inlet to install a liquid line dryer.
Square feet is not the only variable that determine system size. A very well insulated and sealed home may need very little heating/cooling. Not every house needs a 5 ton unit
Damn, just a homeowner here that hired a terrible HVAC guy to install our new heat pump. Hack is definitely the correct term for this guy. I’ve corrected everything on the system I can, air leaks, insulation, room balancing, verifying static pressure to help set fan speeds, and so much more, but I can’t verify he flushed the line set with nitrogen and properly evacuated it. I’m worried I might end up with a situation like this down the road, that will cause the early failure of our system. I’m contemplating finding a new guy to drain, flush and refill the system. More stress than I need.
Bill I can not believe with all you know you had a handyman install your unit. You are good friends with JIM BERGMANN, BRYAN ORR, the few of us that are pretty good at this!!! You could have called ANY one of us and we would have flown out and done it for free for all you’ve done for the industry!!!! Leaving your house system to a handyman????? Mind blown!!!! 🤯
Sadly, the contractor's warranty will expire the day before the first failure happens. The manufacturer may cover parts, but the average homeowner has no idea and contractor gets to collect a second time on the labor.
I'm from Serbia and I'm delighted with your clips and your colleagues from America in terms of frigomechanics and I've learned a lot from you. I congratulate you on the fact that you want to pass on knowledge and you don't hide it. As soon as I had the opportunity via eBay, I ordered what was unimaginable: FIELDPIECE SMAN 3 manifold, BLUVAC micron gauge FIELDPIECE SC 56, vacuum hose, yellow jacket. All this still serves me today after 10 years, except BLUVAC, which is my fault because I didn't clean it regularly with alcohol. I can't forgive myself for that. I also have two older ROBINAIR vacuum pumps, two VALUE and now I bought a FIELDPIECE SMAN 480VINT, a VP 67 vacuum pump and a recovery machine MR 45. I bought the last three FIELPIECES in BELGRADE because a company appeared that imports this tool. Instead of the never-regretted BLUVAC, I got a TESTO 552i i TESTO SMART PROBE. I brag a little about the tool, but I want to tell you that your tool is excellent, and so are your lectures. Greetings from a master from SERBIA.
No there isn't a way to clean that. If this were a standard split system or RTU you already would have a liquid line drier that could be changed a number of times until the acid was gone. You could also add a suction line drier to speed this up in some cases. I'm not a fan of suction line driers because they get forgotten about. If it were a VRF you could temporarily add a canister filter on the liquid line, between the condenser and the branch box. That canister can not be left in the system with or without a filter, because it will trap oil. It must be removed to prevent trapping oil when finished. Unfortunately there talking about a mini or multi split. You have an expansion line going out and a suction line coming back from the head. There is no liquid line to put a liquid line drier on. So yes the correct answer is to replace the whole system.
@@measureQuick I was getting an extremely jagged, sawtooth like pattern at around 850 microns for 1.5 hours, then removed vacuum to begin the decay test and over the span of 15-20 or so minutes it had slowly and steadily dropped to 750, at which point I stopped monitoring
@measureQuick Again. 30 years of installation says otherwise. Those who can't do. Teach. Work for 100 yr old company. Never meet anyone who throws away cores after vacuum.
checking CO at start up and shut down can tell you if you are having trouble with a gas valve not closing soon enough on shut down, or if you are having delayed ignition on startup
Does the manufacturer fully seat the cores when they ship new units? Seems like if they do and valve cores are one time use they should ship them loose or provide extras
What a TON of info here! I love the Scientific methodology to prove out or disprove the value of MQ usage. Outstanding effort to get the word out. Bravo!
Good info thanks. Many RU-vidrs take the core out to pull the first vacuum and put the same core back in. So basically, you’re saying they should be replaced with new. They are cheap.
