high micorns

[keeplearnin]

You know the system is full of moisture I would add a suction drier to that machine.

[archie79]

Status report, vacuum pump has been running for 4 1/2 hours with 2 brief stops for oil changes... Got down to 400 microns but fluctuated up to 2200 and counting... That's almost 20 hrs all together... I'm beginning to seriously wonder about my gauge... It's built into the smann3 field piece gauges..any thoughts?

[timebuilder]

The customer removed the system himself. The system was empty when I started. I'm on site now changed oil in the vacum pump, going to turn it on and take off for a few hours

Then I would make sure you charge for all the time needed, because HE saved all that money by illegally venting and doing the work on the cheap. This is where cheap bites him on the kiester.

[keeplearnin]

Understanding you want to do a good job BUT- put on some driers charge the system explain to HO that because he DIYed you cannot warranty the work and compressor may fail prematurely due to his lack of knowledge. Goodnight.

[knave]

Status report, vacuum pump has been running for 4 1/2 hours with 2 brief stops for oil changes... Got down to 400 microns but fluctuated up to 2200 and counting... That's almost 20 hrs all together... I'm beginning to seriously wonder about my gauge... It's built into the smann3 field piece gauges..any thoughts?

yeah... Is your oil getting cloudy with moisture?? Because it still sounds like some serious moisture.

[gravity]

stop pulling a vacuum thru your gauges and use a proper evacuating method.

are you taking the shraiders out of the system while you vacuum?

[knave]

When you are down at 400 microns, your pump is probably at 350 and the system at 450... anyways 100 microns of pressure diff is .002 psi so yes pull your cores and use big hoses. If it is over ten years old I would put in dryers and say "no warranty"

[royd2]

you might also need to change the filter drier a couple times also.

[archie79]

Sorry for the long delay, I lost my phone in my couch and the battery died so I wasnt sure where it was... I have the evacuation hoses on my gauge.. But that wasnt the problem. The problem was my vacuum pump. Apparently it was sealed.. I figuered it out when I pulled a vacuum on my neighbors car.. Had a smaller version of the same problem. Its an old pump anyways do I took it apart and sealed everything with jb weld. Seems to be working correctly now.. Thanks for all the help guys!!

[knave]

Good deal. It might be a good idea to go ahead and start shopping for a new pump... and keep the one you fixed for a backup... JMHO

[HighTekk^]

I have also seen with many of these newer pumps how they can quickly pull a micron reading of 300 withing 20 minutes and you would think that it would be good but as soon as you turn it off it goes back up. That's from having to much of a vacuum too soon and although it goes down that quick the moisture still takes some time to boil off.

Yes if you can't get that micron reading too low then change the oil, it gets contaminated very quick depending on what your evacuating.

I stopped using manifolds a long time ago because manifold after manifold was found not to hold a vacuum and like some have said here are responsible for giving false micron readings. I now use the super evacuation manifold from yellow jacket, its nice and I would recommend it to everyone.

And don't hook you vacuum pump up while you have a nitrogen charge and accidently open the nitro charge to the pump, or else you'll take an oil bath.

[Bklyntek]

Yes, copper tubing to both sides of system, hookup vacuum pump w/micron gauge attached. Turn on,vacuum pump should pull down to under 50 microns in a minute. Now you know it's good, then open valves(no schraeders) evacuate system. Manifolds are nice, but since they are used so often,can present leaking issues, some hoses will actually collapse under a vacuum. Giving you false micron readings.
Has anybody tried those super hoses(braided type) for evacuating,sure would like to know if it would work.