PDA

View Full Version : evacuation on manifolds and hoses



jev
06-26-2016, 02:40 PM
i know the right way to charge 410a is with 410a gauges and hoses. my gauges actually convert 410a, r22, and 404a. i also know you risk cross contamination of gases and liquids by using said gauges with different types of freon. i had to charge a r-22 unit a while back, and now for the first time since then, i need the same gauges to charge my 410a. this is the very first time ive been faced with this dilemma. ive been retired since 2006, and have limited my work to family only. i have a universal license and several years experience, in the past i would just flush them out, we always had tons of flushing agents, then blow them out with a burst of nitrogen, it was more of a quickie-do thing, and not everybody done it. but now i worry about contaminating my own personal 410a A/C system with r-22 residual oils. if you dont have a flushing agent, or nitrogen, can you get away with a simple evacuation. because im thinking on a 95 degree day you pull 500 microns, it will boil anything in there, anything. i think i read somewhere that the boiling point of oil at 29hg is approx. 75-80F...i know some people use their gauges on different types of freon, like its not a big deal, but personally this concerns me

jtrammel
06-26-2016, 02:55 PM
Back in the 2000nds the manufactures tried to scare us about mixing oils and what not. I think it was a ploy to get us to buy more stuff than neccessary from them.

There's no ill affects to mixing Poe and mo. It will not cause the slightest problems. I've got r410a systems running for 10 plus years utilizing the old r22 lineset with no adverse reactions and no flushing agents used. All you need to do is bleed your hoses when you hook up to remove air and anything that may be in them.

I've got r407c running on mineral oil with a few ounces of supco88 to aid in oil return. No problems.

mrkelly
06-26-2016, 05:10 PM
Most of the 'Dry' condensing units replacing the old R-22 units Had POE oil in Them.
Just be Sure you have no Liquid in your high side gauge line and you'll be Ok.
It's the Gas,NOT the Oil to Fear.

lytning
06-26-2016, 07:22 PM
Couldn't have said it better.

Back in the 2000nds the manufactures tried to scare us about mixing oils and what not. I think it was a ploy to get us to buy more stuff than neccessary from them.

There's no ill affects to mixing Poe and mo. It will not cause the slightest problems. I've got r410a systems running for 10 plus years utilizing the old r22 lineset with no adverse reactions and no flushing agents used. All you need to do is bleed your hoses when you hook up to remove air and anything that may be in them.

I've got r407c running on mineral oil with a few ounces of supco88 to aid in oil return. No problems.

brownbz
06-27-2016, 07:05 PM
I have ran several restriction calls at the metering device, and the thing they all had in common is......used to be r22... Now 407c, usually takes about 2 years... But have seen a at least 8 in the last 3 months. Haven't ran any 410 calls like that, but 407.... Is the devil


Sent from my iPhone using Tapatalk

brownbz
06-27-2016, 07:11 PM
Some 407c hard at work!!!
http://uploads.tapatalk-cdn.com/20160627/6c7a5d6fbf9e5c652937884a79988bac.jpg


Sent from my iPhone using Tapatalk

brownbz
06-27-2016, 07:12 PM
https://vimeo.com/172488512


Sent from my iPhone using Tapatalk

jtrammel
06-27-2016, 07:24 PM
That's bad, I've never had any issues with it. You sure they didn't spill their dip can in the line when they converted it.

johoff34
06-27-2016, 07:56 PM
Brazing without nitro flow?


Sent from my iPad using Tapatalk

lytning
06-27-2016, 08:28 PM
Who wuda done such a thing?

Brazing without nitro flow?


Sent from my iPad using Tapatalk

pecmsg
06-27-2016, 08:54 PM
With several #'s of refrigerant in a system the less then 1oz in you hoses won't do Squat. Including the oil.

jtrammel
06-27-2016, 08:54 PM
Brazing without nitro flow?


Sent from my iPad using Tapatalk

Nah I don't think so, something fishy going on in there.

brownbz
06-27-2016, 08:54 PM
I wish I knew... All I know is, tried to flush with Rx-11 twice. 2 bottles of nitro, and still had to replace the coil and comp. on a 8 yr old system


Sent from my iPhone using Tapatalk

itsiceman
06-27-2016, 09:48 PM
Leak sealer?

jtrammel
06-27-2016, 09:50 PM
LL drier desiccant mixed with copper oxidation for black color?

Send it off to the lab for analysis.

Mr Bill
06-27-2016, 09:53 PM
Brazing without nitro flow?


Sent from my iPad using Tapatalk

If that was the case every system from the 50's to the 90's probably would have failed. Probably more of them still running today than the new junk. :)


Sent from my iPhone using Tapatalk

Poodle Head Mikey
06-27-2016, 09:55 PM
It's my long developed experiential opinion that pretty much whatever you do it fine. I routinely add POE oil to mineral oil, add mineral oil to POE oil, run various refrigerants over both oils.

The basics apply: keep out the air, the moisture, and dirt and you'll be good.

PHM
--------




i know the right way to charge 410a is with 410a gauges and hoses. my gauges actually convert 410a, r22, and 404a. i also know you risk cross contamination of gases and liquids by using said gauges with different types of freon. i had to charge a r-22 unit a while back, and now for the first time since then, i need the same gauges to charge my 410a. this is the very first time ive been faced with this dilemma. ive been retired since 2006, and have limited my work to family only. i have a universal license and several years experience, in the past i would just flush them out, we always had tons of flushing agents, then blow them out with a burst of nitrogen, it was more of a quickie-do thing, and not everybody done it. but now i worry about contaminating my own personal 410a A/C system with r-22 residual oils. if you dont have a flushing agent, or nitrogen, can you get away with a simple evacuation. because im thinking on a 95 degree day you pull 500 microns, it will boil anything in there, anything. i think i read somewhere that the boiling point of oil at 29hg is approx. 75-80F...i know some people use their gauges on different types of freon, like its not a big deal, but personally this concerns me