Vacuum Rise Test Anomalies

Posted by Marc O'Brien - ACRTC on January 23, 2009, 11:46 pm

I'll check back here for comments on my article draft notes whcih can
be read at...

http://www.hvacrforums.com/showthread.php?p=753#post753

Thanks.

Posted by Don Ocean on January 24, 2009, 4:10 am

Marc O'Brien - ACRTC wrote:

> I'll check back here for comments on my article draft notes whcih can
> be read at...
>
> http://www.hvacrforums.com/showthread.php?p=753#post753
>
> Thanks.

Just can't leave without spamming us. Even Mel Damron was better then
that. Thats right.. His forum failed too after a long run.

Posted by Marc O'Brien - ACRTC on January 24, 2009, 6:01 am

> Marc O'Brien - ACRTC wrote:

> > I'll check back here for comments on my article draft notes whcih can
> > be read at...
> >http://www.hvacrforums.com/showthread.php?p=753#post753
> > Thanks.

> Just can't leave without spamming us. Even Mel Damron was better then
> that. Thats right.. His forum failed too after a long run.

Lol, everything eventually fails. Think back to all the empires that
ever existed. Thank back to when alt.hvac was thriving. It may not
always be entropy but it always happens.

I'm beggining to think this place would be better by a long shot
without you.

Off course I'm not likely to return here and see any constructive
comments regarding vacuum rise test anomalies, am I? You just
stubbornly are chained to this one track. A little like a druggies
addiction.

Posted by Don Ocean on January 24, 2009, 11:28 pm

Marc O'Brien - ACRTC wrote:

>> Marc O'Brien - ACRTC wrote:

>>> I'll check back here for comments on my article draft notes whcih can
>>> be read at...
>>> http://www.hvacrforums.com/showthread.php?p=753#post753
>>> Thanks.

>> Just can't leave without spamming us. Even Mel Damron was better then
>> that. Thats right.. His forum failed too after a long run.

>
> Lol, everything eventually fails. Think back to all the empires that
> ever existed. Thank back to when alt.hvac was thriving. It may not
> always be entropy but it always happens.
>
> I'm beggining to think this place would be better by a long shot
> without you.

I doubt that you are capable of lucid thought. Nice try though.

>
> Off course I'm not likely to return here and see any constructive
> comments regarding vacuum rise test anomalies, am I?

Why should anyone rehash something that we have all be educated in long
ago. Maybe you also learned it long ago, but due to a drug and booze
created brainfart, you have lost it and are now relearning it. Also
obviously you are hard up for cash as indicated by your spamming.
I would guess you overpent or the Exwife wants Child support or
alimony increased or jus simply paid on time for a change.

You just

> stubbornly are chained to this one track. A little like a druggies
> addiction.

Your druggies addiction is the one you should worry about. ;-p

Posted by Marc O'Brien - ACRTC on January 25, 2009, 6:41 am

> Marc O'Brien - ACRTC wrote:

> >> Marc O'Brien - ACRTC wrote:
> >>> I'll check back here for comments on my article draft notes whcih can
> >>> be read at...
> >>>http://www.hvacrforums.com/showthread.php?p=3D753#post753
> >>> Thanks.
> >> Just can't leave without spamming us. Even Mel Damron was better then
> >> that. Thats right.. His forum failed too after a long run.

> > Lol, everything eventually fails. Think back to all the empires that
> > ever existed. Thank back to when alt.hvac was thriving. It may not
> > always be entropy but it always happens.
> > I'm beggining to think this place would be better by a long shot
> > without you.

> I doubt that you are capable of lucid thought. Nice try though.

> > Off course I'm not likely to return here and see any constructive
> > comments regarding vacuum rise test anomalies, am I?

> Why should anyone rehash something that we have all be educated in long
> ago.

Hi Don, good question. That is precisely why I'm going to be writing
the article today.

Firstly, why rehash something that we were all taught long ago? Well,
usually because of progress. For instance when we discovered that the
earth was no longer the centre of the universe and that the sun does
not revolve around the earth we rehashed what was traditionally
taught. We no longer teach that there are angels behind the sun
pushing it around - this theory, though widely taught in its day, has
been modified.

You see, everyone I speak to does exactly as I have always done.
Everyone puts the system on for as long a vacuum as they need,usually
24hrs these days, and only then do they carry out a vacuum rise test
for moisture. With smaller mini splits up to say 20kW most engineers
will go for about 1 to 2 hrs vacuuming before doing a vac rise test.
But with VRV systems it tends to be 24hrs.

My point here is that if there is water in the system (note I say
water and not moisture) then especially if that water is in insulated
pipe on a cold day it will turn to ice over 24 hours of vacuum
whereafter there is a very good chance that its precense will not be
detected because the ice may very well not, within 30 minutes, create
a discernable vapour pressure rise.

So I think that what I was taught and what you were taught, all those
years back, should be rehashed. What should be taught now is that a
vacuum rise test should take place before any possible water content
has had the chance to freeze below the sublimation line. This means a
rise test should take place immediately after the first instance a
vacuum of ay 2000 microns has been reached. If no rise occurs then it
is safe to vacuum and to also omit the rise test normally taken at the
end of the 24hr vacuum. If a rise occurs then another strategy be
drafted depending on the site, kit size, ambient temperature and time
permitted etc.

http://www.marcobrien.org.uk

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