Hvac brazing
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- čas přidán 26. 08. 2024
- This is a last minute video, there are some flaws but it's a demonstration. Later we will do a proper video demonstration.
It is not a good idea to use tubing cutters to hold the insulation back. The cutting wheel can damage the copper, and the heat from brazing can damage the wheel.
It is best to use a metal clamp.
Now with proper rest and having breakfast in the morning, my mind is able to understand some of the things I miss. You are the best teacher, hope more good things happen to you.
You are a treasure, hope you are well Sir.
Heat the pipe first just to melt the brazing rod! Anthem! I love it! Just tried brazing today for the first time and melted a hole in the darn pipe.... hip hip... Can't wait to try again tomorrow with your anthem. Thanks Ty!
Im glad you liked it.
Dont worry about how many times you get it wrong, keep working to make it better.
The torch tip must be moving at all times...holding it in one spot will damage your tubing.
you make it looks so easy and seamless love it man
Just takes practice
Thanks for making these videos Ty, it is greatly appreciated. I hope everything is going well at your new location. Best of luck!
Brilliant way of remembering the technique.
Lots of HVAC service is performed with an adjustable wrench ! After a few jobs on various HVAC you would think a tech would opt to carry the correct end wrench or fitting wrench and a proper wrench to remove set screws/bolts on fan blades to motor shafts. Too often I see the adjutable wrench rounding off the head of bolts, fittings, etc. What about the next service call and having to put a wrench on them? The worst of them all is those who use "channel lock" pliers to wrench nuts/bolts/fittings.
Good looking braze.
Ty, your videos have been an incredible aid as a new tech. Thanks so much.
Hi Ty when replacing compressor with 3/4” and 5/8” with oxygen and acetylene torch what size of tip use and should the pressure be higher than 5 acetylene and 10 or 15 to oxygen? Thank you.🌹
Hello Sir, Brilliant videos
Great stuff. Can I place a request? Can you do a class on none condensable refrigerant in a unit? What the symptom's would be and how to be sure not to mistake it for another issue. Thank you so much
I will try to get to it. Still setting up the lab at the new school.
Non condensibles will have the same symptoms as a restriction. With proper airflow you will see a High superheat and high subcooling. I have a paper somewhere in a box I made for that. I will try to find it this weekend.
I recomend using the same solve for both. Recover all the refregerant. Open the metering device and check the screen and look for contamination. Purge some nitrogen threw the line to see if there is any restrictions. Cut out the old drier. Braze in the new dryer while flowing nitrogen. Pressure test with trace amount of refrigerant and a sniffer refrigerant leck detector. Pull a vacuum to 259 microns not to rise above 500 after 20 min or manufacture recomendations. Recharge with new refrigerant.
@@love2hvac Thank you. We are rooting for you here in New York to succeed at your new home 😊. Btw you inspire me to teach my coworkers and I make them all watch your videos. Thanks for everything
Can you do a video of brazing a Brass distributor to a TXV? Just want to see how you’d go about it
Do u suggest brazing high pressure or low pressure side first, or does it matter?
As long as nitrogen is flowing, it does not matter
Thank you Mr.Ty for nice teaching. Is possible to use a propane which is use for heating and cooking or butane gas with oxygen for brazing instead of acetylene gas? Another question when set up the acetylene should be at 5 and oxygen at 10 in the gauge.🌷Thanks.
I oxy propane is possible.
Propane generates less than 10% thermal energy.
10 oxygen and 5 acetylene is a good start. Some people like different numbers and it depends on how big the pipe is.
Good day, You are the best instructor online. Do you have any video about the TXV external equalizer, what/how does what is does, why is better than internal Eq...Thank you!
I prefer external equalizer, it gets a more accurate superheat reading since it is getting it pressure at the end of the evaporator.
Internal gets the pressure right after the txv, and does not account for pressure drop of the tubing in the evaporator.
@@love2hvac Thank you!
Darn I forgot about that o ring😳
With reference to first brazing example nitrogen was purged through liquid service port and the nitrogen will come out from suction service port isn't it?....so we can proceed with brazing after pumping down refrigerant to condenser....is that safe
Yes.
Just remember when you pump down you don't always know the condition of the refregerants or how swell the previous tech dehydrated.
Hi Nice videos! What type of brazing rod do you recommend?
For copper to copper I recomend 15%. It will be a stronger braze that will hold up to vibrations and much less likely to be a call back later on.
Thank you for uploading this video. Is the nitrogen flowing toward the coupling?
Do you prefer oxy-a cytalen or acetylene torch in brazing? Thanks.
I do prefer oxy acetylene , air accetlyne second
Do you remove the cores from the valves? Or its not necessary? The way im being taught, in my job, is not necessary.
For brazing I remove the cores every time. It does not take but a few seconds. They are very small and sensitive to heat. It is also very difficult to flow nitrogen with them in place.
That said, Never argue with your lead. Eventually you will be in your own truck.
@@love2hvac That last part is true..hehe. But you're right. Thank you.
What torque wrench would you use for that piston?
Nice series. But, what happened to rag cooling the joints at the air handler? Annealing?
I should have had another rag inside behind the panel.
It is a good idea to move the wet rag over the joint as soon as its complete to allow for annealing.
Annealing for copper is keeps it soft where as annealing for steel makes it harder and more brittle.
@@love2hvac ;-). thanks for the series!
@@love2hvac I think you mean quench. Quenching copper anneals it making it soft. Quenching steel will make it brittle. Annealing is a term used for process of softening metals. Thanks for the video. Nice.
like it
How do you flow nitrogen through a non-bleed TXV? I've had problems with this in the past. No matter how small I make my flow rate, it still wants to blow the solder out of the joint.
Great question Bob,
If it is a threaded Threaded TXV, I just leave the TXV out until all the brazing is done. Leaving it attached as if it was a fixed till I complete the brazing.
If it is a pre-brazed TXV inside the coil, then I will add a service port outside the evaporator on the liquid and the suction line and push nitrogen threw both lines outside with a tee.
@@love2hvac Thanks for the quick reply!!! Nitrogen will then flow from the injection point outside to the newly added service port. But it seems to me that it won't get to where it's needed - the actual braze point for the TXV which is downstream from the newly added service port. Am I overthinking it?
By the way, yours are by far the best HVAC training videos I've seen so far. I've forwarded them to a couple of my apprentices.
@@cleansebob1 yes your right. It is not nearly as good as it flowing past the braze. The main purpose is to keep the oxygen out to prevent oxidation. So while it is not as good it still limits oxygen.
Thanks for the complement, I'm still learning every day. I Iove this trade.
what type of solder do you use friend thanks
Depends on the application. Most of the time for Cooper to copper I use 15%silfoss
thank you so much
is any PEX systems for HVAC systems? (like in pluming with sharkbite)
I hope not !
When you flip that rod around and it burns a nice brand on your hand, you will start wearing welding gloves. Other than that, and the singing, good video. PS. You should set a better safety example for your apprentices, by wearing the proper personal protection equipment.
Safety note, don't get into the trades, it's too dangerous.