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in school the other night my teacher said a good vacuum with a micron gaugeis 800 or below.But everyone else even other teachers has told me 500 or below. So now im a lil confused. anybody have an exact answer.Thanks

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you subtract 500 from 800 and divide 2.=150

Then add that 150 to 500.=650
and subtract 150 from 800=650
then,
650+650=1300
then 1300 divided by 2= 650.

with that equation you can always know the answer.

[Edited by jacob perkins on 09-25-2005 at 07:52 PM]

3. 800 may be good enough in most cases but be a professional and go to 500
take some pride in your work and dont do the minimum and you will go a long way in the field

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Always pull down to 500 microns and replace filter driers. This will save you lots of time. Do it well the first time... then you don't have to come back and do it again.

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it comes from a slow night on here,

do you know the micron level at which water boils at room temperture?
do you know why the instuctory wants to go so much lower?

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Originally posted by geeray
Welcome to HVAC-Talk

You will understand that type of answers on the run!!!

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the instructor is the one that told me only bring it down to 800 microns but i have always been told to bring it down to 500 or lower by everyone else so thats what i do.

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if you are pulling to 500 you are on the safe side.

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These micron levels come from the manufactuer. Some say in the install instructions to 800 and other manufactuers say 500. some pump manufactuers say pull down to 500.

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In the field, pull to 500 microns. In your class, if this becomes a test question, your answewr is 800 microns.

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Originally posted by Chill
These micron levels come from the manufactuer. Some say in the install instructions to 800 and other manufactuers say 500. some pump manufactuers say pull down to 500.
Trane says 350 and hold for at least 1 minute.

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Originally posted by travisfl
Originally posted by Chill
These micron levels come from the manufactuer. Some say in the install instructions to 800 and other manufactuers say 500. some pump manufactuers say pull down to 500.
Trane says 350 and hold for at least 1 minute.
How often do you get to 350 and hold for one minute? What kind of vacuum setup you use?

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