500 Micron Vacuum in Under 5 Minutes - Pulling Deep Vacuum Fast | HVAC Vacuum procedure
ฝัง
- เผยแพร่เมื่อ 23 ส.ค. 2021
- In this HVAC service call video, I show how I quickly pull vacuum on a residential AC system in less than 5 minutes!
After starting the pump, I was able to quickly pull vacuum down to 500 microns on a 2 ton heat pump system. I was able to achieve this speed using my CPS vacuum and 1/2 inch Appion MegaFlow hoses, on a system that had no leaks and no excessive moisture in the lines.
In my opinion, using the right tools make all the difference!
But in all honesty, proper vacuum pulling takes as long as is needs to..... Plus it makes for a good break to quickly eat, rehydrate, and catch your breath!
So, what's the fastest you've ever pulled a system down to sub-500 microns?
How long do you expect to spend evacuating a typical residential line set?
Feel free to let me know what you're working with....
Thanks for watching!
Feel free to use the affiliate links below if you’d like to help support the channel. I make a very small commission if you purchase through the links. Thanks!
TOOLS I USE
Propane and Gas Leak Detector/Sniffer - amzn.to/3nn3HRY
Fieldpiece SC680 - Wireless Power Clamp Meter - amzn.to/3FsPIjP
Testo 770-3 Digital MultiMeter - amzn.to/3qxVA6V
Fieldpiece JL3KM2 Job Link Dual Manometer Kit - amzn.to/3FAmf7A
Testo Bluetooth Smart Probe Kit - amzn.to/3Kh7cmU
Fieldpiece JL3KH6 HVACR Charge and Air Kit - amzn.to/3ruRVGy
Testo 405i Hot-wire Anemometer I Wireless Smart Probe - amzn.to/3Gv7e8e
Testo 416 Digital Mini Vane Anemometer - amzn.to/3A2tEvg
Fieldpiece STA2 Anemometer - amzn.to/3GBtQUL
Fieldpiece AAV3 Anemometer Velocity and Temperature Accessory Head - amzn.to/3qvA179
Seek Thermal CompactPRO Thermal Imaging Camera - amzn.to/3nvsMu4
CPS ABM-HOOD-200 Easy Air Flow Balancing Hood - amzn.to/3roiEV1
FLIR ONE Pro - iOS - Thermal Camera - amzn.to/3A4YPWz - วิทยาศาสตร์และเทคโนโลยี
Nice instructional video. I have found though that I usually have about 30 minutes of work to do while I’m pulling a vacuum. So I’ve sorta stopped going through some of the effort.
Thanks! I hear that, I'm not going to lie even after owning a rig like this I'm still probably going to end up just use my sman manifolds to pull vac most of the time. Its just more neat and convenient for me. What is your vac set up?
I’ve changed how I evacuate three or four times throughout my career, always trying to get faster. What I’ve noticed is that the more I get into a rhythm and doing whatever it is, it takes me almost 0 additional time. When I first started charging with nitrogen while I break it took me about seven minutes to set it up. Now, it may be two minutes. Same with the vacuum, what are used to be 10 minutes three or four. And when I do it ever problem, unable to realize it very quickly and troubleshooting doesn’t take much time.
Great video! Very knowledgeable.
Appreciate the feedback and thanks for watching!
Nice work
Thanks!
Great nice video
Glad you enjoyed!
One thing to remember too is mineral oil which is common on r-22 units is hydrophobic and won’t absorb water where as poe oil used on r410a units will pull water from atmosphere. A longer vacuum is better than a shorter one. You won’t freeze that water before you can pull it out.
It's a fallacy you'll freeze water. I agree a good long vacuum is more effective.
I love the bluvac hoses. They are awesome, you should try them
Yeah I've seen a few videos on them, they look really cool. What is it that you love about them?
@@HVACTechKnowledgy EXACTLY. What is it that you love? A larger ID hose TAKES LONGER to pull down. If the theory was true a 12" sewer pipe would pull down even faster. Wrong........ All you are doing is adding more interior surface space or volume to the lineset. Wake up people....... Quicker to empty a bathtub with a bucket than a swimming pool.
I truly enjoy watching your videos. When you finish your vacuum, how do you install your schraeders without introducing air?
Introduce refrigerant into the system first then put your Schrader valves in.
Hey, yeah you definitely want you to introduce refrigerant to the system first before trying to reinstall the Schrader cores. I'm going to be uploading the rest of this video, showing each step of the vacuum procedure to show how I do it with a single hose setup. Thanks for watching!
Ok thanks.
Hi your pump it’s 1 stage or two stages? Thx
One hose ? Great I'm trying to buy this cps micron gauge
Yeah I only use one hose. Yeah this Micron Gage has been good to me haven't had any issues yet been using it for three or four years now.
Man, my digital manifolds tend to read anywhere 30p to 600 higher than using a micron gauge is the reason why i always add one to the circuit. I live the setup, though. I can only imagine th cost.
Yeah I used to use my fieldpieced manifolds to pull vacuum as well but they just let me down too many times. The setups actually not that expensive. I think the hose and valve core removers is around $100 and the Micron gauge is Maybe $150.
great vid. as i pull a vac down to 4/500 microns and the isolate the pump, the gauge shoots back up immediately. I am certain there are no leaks, could moisture in my hoses cause this issue?
sometime there is refrigerant in the compressor oil that hasn't come out of the oil yet I took a compressor out to replace it and when i set it
down hard oil shot out of the suction side of the compressor . I had the valves open for days before I removed it.
My problem is that a lot of these large diameter hoses all neck down at the fittings
Is that a 410a or r22 system repair? Freon is always much faster than 410.
It was 410a
I’ve gotten to where I change it after every use
Are you referring to the vacuum oil?
I was taught not to pull vacuum to quickly at first, use manifold to regulate flow barley crack valve for around 10" at first for about first 3min or so, too quick to pull initial vacuum causes any moisture in system too freeze & not turn to vapor & be removed.
I learned that in HVAC school as well but after being in the trade for some years you realize that isn’t really necessary it’s just a precaution, once you have the ideal vacuum set up you pretty much know how much to turn the manifold gauges or what hoses/vacuum pump you should use on a specific piece of equipment. Never hurts to be on the safe side though 🤙.
Can agree with you. On a new install you want to slowly vacuum etc. Just that 5 minute headlines gonna fuck with new guys.
Getting there is the easy part.
It’s holding the decay over a 10 or 15 minute period of time without reaching 500 µm that’s where the real world is to pass your test.
The difference in work to get to 500 µm and the difference in capable of holding it after it’s isolated a analogy would be
Getting to 500 µm is like picking a feather pillow up over your head
But to get down to the level so you can maintain and hold below 500 µm after decay test is like picking up a refrigerator and climbing up the stairs to the top of the Statue of Liberty.
Nice analogy but everything's easy once you understand what and what not to do. For instance, there are people right now that find it difficult to get to 400 microns based off of either the equipment they're using or techniques. On the other hand there are people out there that find it easy to get a system dry and tight enough to hold a vacuum at 400 microns for 10 minutes in a decade test. Its all relative. One person Statue of Liberty is another person's feather pillow, but we all have to start somewhere: ) I appreciate the feedback thanks for watching!
@@HVACTechKnowledgy once you really get it down on a new clean tight system that your commissioning you’ll get down below 60 µm easy and decay and hold at around 100+ microns
It’s all feather pillows
When you first turned the vacuum pump on and the micron gauge was searching i noticed the suction line valve port closed. Then when you removed the yellow hose you went back thru your process but the 2nd time you opened the suction port valve. Lol
Hey, I appreciate the analysis but yes I had the liquid line closed off intentionally. Probably should have explained that better in the video, that's my fault. I was trying to test the yellow hose by itself as I've had issues with it before. Also the way that vacuum gauge works, it's not going to go below three bars if it's still at atmospheric pressure. Each bar combination set indicates a certain Micron range above 25,000, ie Pressure between 100,000 and 76,001 micron Indicated by the top, middle and bottom bars energized
Pressure between 76,000 to 50,001microns Indicated by the middle and bottom bars are energized.
Pressure between 50,000 and 25,001 microns etc. So it was pulling a vacuum below 76000 microns. My issue was that it was fluctuating from 76000 to above 76,000 shows that system wasn't tight. Hope this helps. Appreciate the feedback and thanks for watching!
Dude, 500 microns is not a good place to stop pulling. Now 50 microns, you got my attention.
I respect that
You were supposed to open your gas balast when you turn on he pump till you reach 2000 microns
👍
Can someone please explain how a larger ID BLUE hose, evacs faster? All you are doing is adding MORE interior volume to the lineset. A bathtub will empty quicker than a swimming pool. Duh!! And removing those Schrader cores is another joke. What is that a 2 ton unit? LOL It ain't the space shuttle guys.........
But, really why do we care? I train all my apprentices that our BIAS is to get the AC under pressure. From there, we have sheet metal, drains, gas line, stat (including configuring it), flue, caulk, whip, 120V/240V, disconnect, clean up. etc. The vacuum pump is working while we work. I use a single 1/2" low leak hose, dedicated for vacuum. If it takes me 12 minutes or 30, I do not care. By planning effectively, I will always have 2 -3 hours of work left when the pump is hooked up. I have spent the money; I have all the Appion Ts, Valve core etc. But I am always scratching my head while guys through all the extra work of pulling cores etc. I want a deep vacuum. I don't need a fast one.
Have you never done service? There are plenty of applications where nearly the last thing that needs to be done is pull a vacuum and recharge the system. And fast vacuums are the different between a 2 hour Evap coil replacement and a 4 hour one, for example.