HVAC - Replacing A Schrader Core Under Load
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- Опубликовано: 16 сен 2019
- In this video I use the Navac 2 in 1 Schrader core removal tool to replace a Schrader core under load. This HVAC tool is a must have for any HVAC technician.
This tool can be purchased at trutechtools.com with 8% savings using promo code knowitall.
www.trutechtools.com/NAVAC-NV...
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I would add: for double checking/testing: squirt some soap bubbles (blu) on the Schrader check for leaks and spray off with some portable compressed air (carry canned air) the soap bubbles. Some might find that over-kill; however, a high % leak area are Schrader valves.
That's what I put Nylog on the caps 😉. Portable compressed air on the roof lol, you cra cra lol
Nice work!
Thank you for the outstanding instructions. Do we have to wear the neon safety vest while replacing the valve?
Wow, amazing tool.
Sure is!
Does it matter if you do this process while the AC is on or off?
Have had schrader valves leaking that won't come out from over tighten brass caps forms bad mushroom on fitting c.d.c. sells kit for their core valves that fixes this .
Are all schraeder valve cores the same size? What is that lygar liquid used for? Is it a must?
Thanks, like that nylog on the core. Don’t like the Navac tool: bought 3 and 2 have failed same way (core clip tip is pinned in place, pin rounds off and fails)
Fwiw, decided to go with Appion MegaFlow
I just watched yr video...I orderd a shreader core removing tool...want vto know how to use it...th ks fr vthe vvideo...
As always great videomy brother thank you in advance. Question. I would like to be in one of your potcast talking about cooking equipments in NY city and the 5 boroughs. Great video thank you
That would be great...shoot mean email gary@hvacknowitall.com
@@HVACKnowItAll thank you i will my brother. Thanks for the opportunity
Excellent!! One question. What is the nyloc for. Sealing or like loctite? I do a fair amount of automotive and I find a good percentage of leaks r due missing or loose caps.
Nylog is a sealant and assembly lubricant made from refrigerant oil, doesn't contaminate a system.
A piece of equipment not to go with the cheap. The ball valve needs to be light and smooth on rotation to immediately detect if a Schrader valve got hung up in the ball valve area. Crunching the Schrader valve when turning the ball valve and you can be in one hell of a pickle.
The damaged inside tip of valve was likely done when he jammed the last part of ball valve rotation closure (2:17 time stamp). That particular tool does not apparently have enough travel to let that Schrader valve clear the ball valve.
Putting Nylog on a Schrader valve!! Really got to be kidding.
Canada is great, i can say i have not tried the navacs' yet.
You will...one day!
Why not put a little bit on schrader gasket?
Can this be use for car ac port valve too?
MASTERCOOL (81490) R134A Valve Core Remover Installer. Ordered one for my high side on my truck
What about the air behind the ball valve when you go to replace the shrader? Does the positive pressure of the refrigerant help avoid that air going into your system?
Yes, air can't get in the pressure is lower than refrigerant
It should be purged by slightly loosening the end cap before screwing in the new valve.
@@HVACKnowItAll I can't believe people are telling you that you didn't purge your removal tool. HELLOOOO people the system is at 100 something psig when off.
The little vessel where the schrader comes out becomes pressurized with refrigerant. Old schrader out, new schrader in and only the shcrader goes in.
You can't push air in unless you for whatever reason carry an air compressor on the roof for whatever reason to do your schrader removing jobs...
@@derrickenbuenosaires exactly
Can anyone tell me the name of the ointment he puts on the valve threads???
It called Nylog, it's refined refrigeration oil!
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Are those Navac core tools vacuum rated AF?
20 microns brother
Thanks. Link to tool?
www.trutechtools.com/NAVAC-NVR1-VCRT
Use promo code knowitall to save 8%
Ótimo vídeo. Onde encontro essa ferramenta? Na Trutechtools não tem em estoque. Por favor.
Mine NEVER comes off the first time☹😭☹
Put some Nylog on the tip of the tool, it will help grab it
You're the man!!!👍
im happy you have your high lighter on in broad day on a roof top so an airplane dosnt accidentally come down and hit you...gotta love Canada
You should be comedian bruh, the building requires to soooo write them a letter 😉
You forgot to purge the the tool removal tool before inserting the new valve in. Every little bit of air matters.
Air at 14.7 psi can't enter the system at 10 times its own pressure.
@@HVACKnowItAll dude you have this wrong. when you turn that ball valve to let the plunger through, you mix the air thats in that little cap you screwed on (attached to the remover tool) with high pressure refrigerant and it does get mixed in because its a ball valve.
At that point, and before the schrader goes on, air can get it because there is no pressure difference between the inside of that cap and the system and neither is there a valve or restriction. Its not air from the outside at normal atmospheric pressure, its air that was in that cap that you pressurised when you turn that ball valve .
@Jay A have you have pressurized something that was approx 0.19"³ that wasn't hermetically sealed? If you have you'll know that it leaks quite rapidly at a moleculer level. The pressure difference between atmosphere and system obviously increases this rate. Air separates it's self from refrigerant as a non condensable, air molecules are smaller and lighter than refrigerant molecules and because of that, they will be the first to leak on the outer shell of the fitted tool and hit atmosphere. So unless you show me a side by side refrigerant analysis before and after that shows any difference then I think we're good here. My bet is that analysis would show neglible results of air/moisture difference.
@@HVACKnowItAll what are you going on about? nobody is talking about a pressurised system loosing containment due to not being hermetically sealed. You're just making a blind argument without even trying to understand my point. ive explained it multiple times but you dont really want to understand it seems.
The air is already mixed in with the high pressure refrigerant in the tool cap. It is at the same pressure as the refrigerant. there are not pressure differences for what we are talking about. You equalised the pressure inside the tool (either side of the ball valve) when you opened the ball valve.
yes ive dealt with highly pressurised system. Given i deal with exotic states of matter, i understand these concepts better than you and have tried to explain how it actually works, ive even emplored you not to listen to some random on the internet and instead just speak to engineers (not sales team) for any of the reputable core remover manufacturers. Ypu Hvac tech take 1st semester undergraduate thermodynamics and think you understand everything, you really dont.
You keep implementing poor practice, i honestly give up on you.
@Jay A no blind statement bud...show me a refrigerant analysis comparison before and after the core replacement and show the refrigerant pressures at same ambient temp, did it rise? Air will cause it rise. Did the moisture content increase? Show me a neglible difference and you can have the win. Pretty simple!
you just potentially let some air into you system by not purging the plunger end of the tool. What worse is that you seem to be trying not to purge it because you repeatedly mention that youve checked the fitting is on there tight
I don't believe you understand how pressure difference works. Atmosphere at sea level is 14.7 psi. Inside the system is over 100 psi. It's impossible for atmosphere to over come approximately 10 times its own pressure. Next time ask questions.
@@HVACKnowItAll i dont think you understand how fluid dynamics works. the pressure front isnt a single solid surface, this idea that you can keep a low pressure gas out because you have a much higher pressure gas on the other side of the valve is BS, sure it will sometimes keep it all out but certainly not always and whether it does will also depends on the type of valve you are dealing with - a ball valve is not the same as a schrader in terms of how likely it its to let air in when you have unequal pressures on either side.
The plunger literally has air around it and you are pushing it through a friction restriction towards the system valve. if you think there is no chance of letting air in, you are fooling yourself - air is already mixed in with refrigerant in the plunger cavity. The pressurised gas doesnt push through a schrader you do understand that right? you are using a ball valve, the gas absolutely will pull some air towards the system valve as it rushes into the low pressure plunger cavity (as you open the ball valve to let the tool plunger through) and the pressure equalises, unless there is somewhere to push that air out to -i.e unless you purge the tool cavity. Its not going to push against the air and just keep it pinned to the back of the cavity like youre expecting.
no im not a hvac tech but i am a physicist. so keep telling me how i dont understand pressure 🤣🤣 you dont have to believe me, go ask the manufacturer of the core remover tools.....
thanks for liking this btw! 🤣
@Jay A I appreciate the comment? Have the used the tool? When fasenting the portion of the core tool, it's not 100% fastened. Meaning it's slightly leaking by. All things leak at a molecular level especially with a small volume, easily proven when trying to hold a vaccum on a vessel with low volume like a micron gauge . When I puff my cheeks and blow out, I also know room air is not entering my mouth due to the pressure difference and pressure moving from high to low at a constant pace. Merry Christmas
@@HVACKnowItAll if it was loose, that's exactly the purging im talking about. i just dont think you did it enough to remove all the air. ive used these tool yes and normally you can hear the change when all the air is gone from the cavity and it has to be loose enough to actually allow significant amounts outz not allow a small amount to leak out. I appreciate air will always get in through the methods you mentioned but its a decent amount of air in the fitting for the tool, the 'cavity'.
why not purge it like you would a lineset for a fraction of a second until you hear the change and there is no more air left in the tool cavity? Its just better practice imho.
anyway merry christmas to you too!
@Jay A and that's the problem with the internet, everyone is an expert on everyone else's job. You weren't physically there. Comments should start with questions not statements.