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I use this on Gaskets, pipe threads (with teflon on first) (some claim no tape needed), flare faces & more. The mineral product is better for both applications as it is not as hygroscopic and gives up it's moisture under vacuum.
Ignore him some of those guys haven't a clue. Nylog is just oil. Ain't gona hurt a thing, and will help lots. Originally Posted by jcthomasva Hi All - I hate to resurrect a dead thread, I was researching opinions on nylog sealant. I took an authorized Fujitsu mini-split class last week and the instructor expressly said DO NOT use any sort of dope or sealant on the flare connections on Fujitsu mini-splits. I asked specifically about nylog, as I'd always used it on mini-splits, and he said not at all. He explained that the TXV on minis is as small as a pin, and that the smallest contaminant would wreak havoc on it. He assured us that flare connections cranked to the proper torque spec would be sufficient. I was curious if anyone else had encountered similar statements from other manufacturers?
I do the most work with Fujitsu mini splits, and use Nylog on every one, and have seen many other installers make the switch and use Nylog with Fujitsus, and have had 0 problems with metering devices. I have had problems with metering devices on MS units where the installers have brazed line set connections.
I agree with Mikey on this... Nylog totally desolves in the oil when it gets into the system... so not an issue. Having said that... *By standing on the NO sealants policy... Fujitsu does not have to replace, under warranty, as many TXV's. *And IMO it is the responsibility of us techs... to use the nylog carefully and not in excess. I have used it successfully on mini flares many a time... works fine... and no issues.
I call My bet is that the man was just mindlessly repeating a memorized-mantra. Nylog is thick oil. If a drop of thick oil, diluted by many ounces of thin oil, will clog a TXV orifice - they are making them wrong. <g> A standard straight pin is about .030" diameter. Which, as orifices go, is pretty big. By his logic we could repair all refrigerant leaks that are .030" and diameter and smaller by simply adding a drop or two of Nylog to any leaking system. Or at least wreak havoc with them. <g> PHM ---------- , Originally Posted by jcthomasva Hi All - I hate to resurrect a dead thread, I was researching opinions on nylog sealant. I took an authorized Fujitsu mini-split class last week and the instructor expressly said DO NOT use any sort of dope or sealant on the flare connections on Fujitsu mini-splits. I asked specifically about nylog, as I'd always used it on mini-splits, and he said not at all. He explained that the TXV on minis is as small as a pin, and that the smallest contaminant would wreak havoc on it. He assured us that flare connections cranked to the proper torque spec would be sufficient. I was curious if anyone else had encountered similar statements from other manufacturers?
I call
Hi All - I hate to resurrect a dead thread, I was researching opinions on nylog sealant. I took an authorized Fujitsu mini-split class last week and the instructor expressly said DO NOT use any sort of dope or sealant on the flare connections on Fujitsu mini-splits. I asked specifically about nylog, as I'd always used it on mini-splits, and he said not at all. He explained that the TXV on minis is as small as a pin, and that the smallest contaminant would wreak havoc on it. He assured us that flare connections cranked to the proper torque spec would be sufficient. I was curious if anyone else had encountered similar statements from other manufacturers?
Originally Posted by Nytefog I mas moving Mitzu mr slim and when I cut the flare off the liquid line I found a long stream of blue leak lock inside the pipe when they added it to the flare fitting. Only reason I use a dab of nylog on flares it so it tightens down smooth and keep the flare from ever coming loose at all. (On refrigerant flares only) One condenser I went to attach my low side gauge to has blue leak lock jammed in the Schrader port and it was rock solid I couldn't scrap out the stuff or remove the Schrader valve. Luckily their was a suction line drier on this unit but someone took out the Schraders so when I took the cap off I had refrigerant rocketing out. I put my finger over the port while I grabbed a hose from my gauges, then got my Schrader removal tool and installed one on both ports. I hate sloppy seconds!! Btw, they guy wanted me to put uv dye in the systems which I don't care to unless absolutely the last option. Well, since the low side was blocked and I had the dye stick in line with my gauges low side hose ,and the port blocked, I had to remove the hose from the port with refrigerant and pressuring the hose and stick u can guess what happened with all that dye....never again... Been down that road before... what a mess! OTOH... gave me an excuse to buy a new set of hoses...
Originally Posted by Fatstogey huh thats a new one for me. Havent seen leak lock on a flare fitting yet. Hope i never do. Of course i was doing install so i was busy doing it right. I am gonna be doing service more now so im sure ill get the chance to deal with that crap. lol And i guess leak lock is a pet peeve of mine too. I usually do a very light bead around the 2nd thread. I cant stand it when guys fill every thread with it. I wanna snatch it from them. I mas moving Mitzu mr slim and when I cut the flare off the liquid line I found a long stream of blue leak lock inside the pipe when they added it to the flare fitting. Only reason I use a dab of nylog on flares it so it tightens down smooth and keep the flare from ever coming loose at all. (On refrigerant flares only) One condenser I went to attach my low side gauge to has blue leak lock jammed in the Schrader port and it was rock solid I couldn't scrap out the stuff or remove the Schrader valve. Luckily their was a suction line drier on this unit but someone took out the Schraders so when I took the cap off I had refrigerant rocketing out. I put my finger over the port while I grabbed a hose from my gauges, then got my Schrader removal tool and installed one on both ports. I hate sloppy seconds!! Btw, they guy wanted me to put uv dye in the systems which I don't care to unless absolutely the last option. Well, since the low side was blocked and I had the dye stick in line with my gauges low side hose ,and the port blocked, I had to remove the hose from the port with refrigerant and pressuring the hose and stick u can guess what happened with all that dye....never again...
Ditto Originally Posted by Mike19 My nylog sat in my van through the sub zero temps all winter, and its still fine.
Originally Posted by superfittertech Got a question. I guess since its gelatin oil does freezing sub zero storage temperatures affect it? My nylog sat in my van through the sub zero temps all winter, and its still fine.
Originally Posted by Poodle Head Mikey I like the idea of putting nylog on the male fitting: flare face and fitting. As well as on the back side of the copper flare. I like the idea of oiling All the mating surfaces and the threads. Guys routinely slobber Leak Lock all over flares and flare nuts. Also seal caps, flanges, and pipe fittings. I have twisted off brass compressor fittings (access ports) because they were Leak-Lock-welded in. PHM ------ huh thats a new one for me. Havent seen leak lock on a flare fitting yet. Hope i never do. Of course i was doing install so i was busy doing it right. I am gonna be doing service more now so im sure ill get the chance to deal with that crap. lol And i guess leak lock is a pet peeve of mine too. I usually do a very light bead around the 2nd thread. I cant stand it when guys fill every thread with it. I wanna snatch it from them.
Got a question. I guess since its gelatin oil does freezing sub zero storage temperatures affect it?
It makes a night and day difference on the back of the copper part of a flare connection. It pretty much takes the static friction out of the equation when torquing so you know you've got proper compression if you're using a torque wrench. I've done nearly 100 flare connections in the past year (lots of mini splits) without a single leak. Sent from my iPad using Tapatalk
I use nylog on everything I want to seal in hvac, I even squirt a little between my txv nuts to prevent seizing and on the the sealing rings w never an issue. Wonderful stuff!
I like the idea of putting nylog on the male fitting: flare face and fitting. As well as on the back side of the copper flare. I like the idea of oiling All the mating surfaces and the threads. Guys routinely slobber Leak Lock all over flares and flare nuts. Also seal caps, flanges, and pipe fittings. I have twisted off brass compressor fittings (access ports) because they were Leak-Lock-welded in. PHM ------ Originally Posted by Fatstogey Yea ive not really used nylog much myself. Was working with a new guy who was using it. So he convinces me to use it, which ok i see its usefulness... ill get some. But he was doing the same. Putting it on the female threads on a flare fitting. And i was working for him and it was driving me nuts and i couldnt really say anything. lol Luckily one of them leaked and i took it out.... showed him how to do a flare properly for starters, then put the nylog on the male side of the flare on the mating surface. I had never really used nylog before but apparently this is a HUGE pet peeve of mine too. LOL cause it was bugging the crap outta me when i watched him do it. Like ace bottles with teflon on them. Also i dont understand where you guys are seeing leak lock? I use leak lock on threaded drain fittings. People are using leak lock on flare fittings? is that what you guys are saying? if so that snew to me.
Originally Posted by LKJoel I was always taught to put some oil on my flare before assembling, for the same reasons as above. NEVER leak-lock, dope or T-tape obviously but just a bit of ref or vacuum pump oil. When nylog came on the market, I begin using that. Oil/nylog provides lubrication so your flare doesn't twist and kink when tightened. It also displaces any moisture out of the flare threads and reduces vibrations that may cause the nut to loosen over time. Unlike thread sealants neither oil or nylog occupy enough space to compromise the flare joint, so there should be no harm in using it. One if my biggest pet peeves is guys who put thread sealants on flare threads, or any compression fitting for that matter. It simply shows they do not understand how a compression fitting works I use either nylog or oil on every flare joint i make and I have never had a call back due to a leaky flare...... Maybe it's just me..... Yea ive not really used nylog much myself. Was working with a new guy who was using it. So he convinces me to use it, which ok i see its usefulness... ill get some. But he was doing the same. Putting it on the female threads on a flare fitting. And i was working for him and it was driving me nuts and i couldnt really say anything. lol Luckily one of them leaked and i took it out.... showed him how to do a flare properly for starters, then put the nylog on the male side of the flare on the mating surface. I had never really used nylog before but apparently this is a HUGE pet peeve of mine too. LOL cause it was bugging the crap outta me when i watched him do it. Like ace bottles with teflon on them. Also i dont understand where you guys are seeing leak lock? I use leak lock on threaded drain fittings. People are using leak lock on flare fittings? is that what you guys are saying? if so that snew to me.
Talked to a guy at the suppliers last week that is still using leak lock, never puts anything on the face of a flare, and he is the one that doesn't need a micron gauge because he can tell from the sound of his pump when he has reached 500 microns. He is the top tech for a large company. Some day I should follow him and go after his customers. ( Maybe if I were younger) Originally Posted by Poodle Head Mikey Try a little torch heat on those leak locked fittings next time. PHM ------
Try a little torch heat on those leak locked fittings next time. PHM ------ Originally Posted by hvac wiz 79 I wish the guys who use goose sh!t (leak lock) would learn to use nylog. Have busted my knuckles so many times cracking open fittings with that blue junk Sent from my SGH-T999 using Tapatalk 2
itaintme I also like high vacuum grease. The edge that Nylog has over that grease is that it is oil and will be totally harmless if it enters the refrigeration system. That said, I would still use high vacuum grease in applications like the debris tube on my TEZ8 vacuum pump
Since using Nylog on line tap valves I have never had a leaker.
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