A few noobish questions on parts acquisition

[Xeon th MG Pony]

He origionaly posted the links to the government file, so you can look it up, I did tell you to look it up if interested though & I would expect some one to duble check befor folllowing some ones advice.

Any way point taken, next time I'll hunt down his orrigional post and point to the legal site he got his info from.

And this is Canada, Our laws are considerably differant on quite few things.

[SoddemFX]

Tom, I'm hazarding a guess that the bucket of cold water is used to chill your recovery cylinder?

Hi gomeler,

Yes that's right although it doesn't have to cool it below ambient, it just acts to transfer heat from the aluminium bottle walls as the refrigerant condenses on it. The energy needed to shift a bucket of water by a single degree is very large, maybe ~40KJ+ for 10L. In comparison a system containing 100g or r404a might dump ~15-20KJ, so it might shift it by half a degree, nothing realy...

Tom

[Exahertz]

water's a better heat conducter... gotcha.

is that a standard (legal) practice with all recovery?

[Exahertz]

seems like it would be kind of hard to hold a cylinder down under water while its trying to float.

what about wrapping the cylinder in towles and use a garden hose to keep fresh cool water on it, wouldnt that work as well?

[n00b 0f l337]

Not at all, put something on top of it

[SoddemFX]

It's not standard, compressor in suction might pull down to ~2PSIa so it's probably not legal either but i bet it's pretty close...

Walt - What is the legal requirement for recovery in the US?

Edit just looked quickly as the US section 608:

90 percent of the refrigerant when

* the technician uses recovery or recycling equipment manufactured after November 15, and
* the compressor in the appliance is operating

In order to ensure that they are recovering the correct percentage of refrigerant, technicians must use the recovery equipment according to the directions of its manufacturer. Technicians may also satisfy recovery requirements by evacuating the small appliance to four inches of mercury vacuum.

I guess it probably is borderline legal for the US at least...?

NoL - Put a couple of bricks on it. You watch the discharge pretty close during the start so you see what it's doing, after that it settles down very quickly as the volume of refrigerant moved decreases...

Tom

[wdrzal]

many gases need to be recovered to>20hg and some to >than 25hg


http://www.epa.gov/ozone/title6/608/608fact.html

[SoddemFX]

Jees, it's inches of vacuum, i thought it was inches absoloute...

http://www.epa.gov/ozone/title6/608/608evtab.html

From that table and from the bold high lighted text above (above cut from the same page you gave), then it'd seem (example r22) that you'd need to either recover the system to atmospheric pressure or 4" Hg vacuum. I'm guessing that from the small charge these systems would class as small appliences and the 4" Hg would apply. Is this right Walt or am i barking up the wrong tree?

I guess it's irrelevant with me not being in the US anyway - but hey

Tom

[wdrzal]

Those may be old tables older machines made before 1993 only have to revover to <10hg vacuum modern equiptment the range goes from<10hg vacuum to < 25 hg vacuum that leaves very little gas left,it's lower than most standard compresors can pull,

keep in mind 29.92 hg vacuum is a perfect vacuum.

[Marvin]

excelent thread....
Should this regulator/manometer can be used to purge while brazing ?
With co2 or N2 ?

[n00b 0f l337]

That looks like something for dentistry almost...