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Microns rise while pump is on?
Hey y’all
New to this forum. Sorry if I posted on the wrong thread. I just got a new SMAN manifold as well as a new JB eliminator pump. I’m pulling a vacuum on my gauges. But I noticed that I’m near 1000 microns while the vacuum is being pulled on my gauges. Once I turn the pump off, it drops to about 600. I don’t understand why it would show higher while it is running? I’m quite baffled. Any input is appreciated.
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Originally Posted by
TwoFace
Hey y’all
New to this forum. Sorry if I posted on the wrong thread. I just got a new SMAN manifold as well as a new JB eliminator pump. I’m pulling a vacuum on my gauges. But I noticed that I’m near 1000 microns while the vacuum is being pulled on my gauges. Once I turn the pump off, it drops to about 600. I don’t understand why it would show higher while it is running? I’m quite baffled. Any input is appreciated.
New hoses?
Sent from my SM-N960U using Tapatalk
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Originally Posted by
TwoFace
Hey y’all
New to this forum. Sorry if I posted on the wrong thread. I just got a new SMAN manifold as well as a new JB eliminator pump. I’m pulling a vacuum on my gauges. But I noticed that I’m near 1000 microns while the vacuum is being pulled on my gauges. Once I turn the pump off, it drops to about 600. I don’t understand why it would show higher while it is running? I’m quite baffled. Any input is appreciated.
What do you mean by turn the pump off? Do you mean close the valves on your manifold?
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
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No, I have the low, high, and charging hoses open on the manifold. I turn power off to the pump via the switch.
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Originally Posted by
R600a
What do you mean by turn the pump off? Do you mean close the valves on your manifold?
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"Is this before or after you fired the parts cannon at it?" - senior tech
No, I have the low, high, and charging hoses open on the manifold. I turn power off to the pump via the switch.
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Originally Posted by
R600a
What do you mean by turn the pump off? Do you mean close the valves on your manifold?
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
Yes, new hoses.
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Originally Posted by
TwoFace
No, I have the low, high, and charging hoses open on the manifold. I turn power off to the pump via the switch.
Weird.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
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All 3 hoses hooked to the pump? Brand new sman right? Virgin out of the box? A dirty sensor will play like that. A leaky hose will play like that. And by leaky I mean miniscule. Just enough to bypass at a deep vac. New hoses also off gas... first thing is to not use you gauges on a vac. Don't trust your manifold micron gauge. If you use a manifold, use an external gauge and place it as far away from the pump as possible.
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You need to search the threads on this site for the proper way to pull a vacuum without driving yourself crazy. Using your manifold is not the way to go. Your gauges are not rated for vacuum.
I can tell you we all have been driven batty at one time or another with pulling vacuums.
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Is that really true? I did not know that.
Originally Posted by
joemach
. . . Your gauges are not rated for vacuum. . . .
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Originally Posted by
Smilin Steve
Is that really true? I did not know that.
Not exactly. They are just not ideal.
Particularly for measuring vacuum level.
Hoses mainly are not great for holding vacuum.
They will transfer the vacuum fine, albeit slower then ideal.
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Originally Posted by
Smilin Steve
Is that really true? I did not know that.
As far as I know, that is correct.
But if I am wrong, others will be along shortly to correct me.
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Originally Posted by
heatingman
They will transfer the vacuum fine, albeit slower then ideal.
Sent from my iPhone using Tapatalk
Also slower than a snail.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
-
Using a manifold we used to take over an hour to pull a vacuum and it would rarely get below 600 microns. Now on new installs I rarely take over 3 minutes to get below 500 microns and usually I run it below 100 microns. True blue hoses and the bluvac micron gauge with Appion core removers are amazing.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
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I've used my manifold to pull deep vacuums many times. How can you say the manifold is not rated for a vacuum when it has a vacuum gauge built into it? that doesn't make any sense. Even the tiniest leak can give you big headaches when trying to pull a vacuum. I have often had issues using lossless fittings. A lot of micron gauges on the market are pretty cheap and unreliable. sometimes you get a good one, sometimes you get crazy readings. If it seems odd I wouldn't trust it, and what you're describing definitely seems odd. you can generally speed up an evacuation if you use the biggest diameter and shortest lines possible. I generally use my 4port manifold which has a larger diameter hose to hook up to the pump. I would suspect the micron gauge itself in this case because the symptoms don't really add up. maybe compare it to a known good micron gauge or a mercury manometer if you have one.
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Originally Posted by
cmdunn
I've used my manifold to pull deep vacuums many times. How can you say the manifold is not rated for a vacuum when it has a vacuum gauge built into it? that doesn't make any sense. Even the tiniest leak can give you big headaches when trying to pull a vacuum. I have often had issues using lossless fittings. A lot of micron gauges on the market are pretty cheap and unreliable. sometimes you get a good one, sometimes you get crazy readings. If it seems odd I wouldn't trust it, and what you're describing definitely seems odd. you can generally speed up an evacuation if you use the biggest diameter and shortest lines possible. I generally use my 4port manifold which has a larger diameter hose to hook up to the pump. I would suspect the micron gauge itself in this case because the symptoms don't really add up. maybe compare it to a known good micron gauge or a mercury manometer if you have one.
Are you using Vacuum rated hoses?
The manifold set up is a huge restriction for the vacuum pump!
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Originally Posted by
cmdunn
I've used my manifold to pull deep vacuums many times. How can you say the manifold is not rated for a vacuum when it has a vacuum gauge built into it? that doesn't make any sense. Even the tiniest leak can give you big headaches when trying to pull a vacuum. I have often had issues using lossless fittings. A lot of micron gauges on the market are pretty cheap and unreliable. sometimes you get a good one, sometimes you get crazy readings. If it seems odd I wouldn't trust it, and what you're describing definitely seems odd. you can generally speed up an evacuation if you use the biggest diameter and shortest lines possible. I generally use my 4port manifold which has a larger diameter hose to hook up to the pump. I would suspect the micron gauge itself in this case because the symptoms don't really add up. maybe compare it to a known good micron gauge or a mercury manometer if you have one.
The marketing people are the reason for your onboard micron gauge. Not a good idea, sure but yet here we are. You have to be really careful about what you believe just because it is advertised. A manifold can work but the potential for leaks is very very high. This is true of a new manifold much less one that has been in your truck swinging around for the last few years. I've also found new hoses that will not hold vacuum at all. Doesn't seem to be a brand thing as one set will do okay and the next may do terrible, all with the same label. Do as suggested and get yourself a good vacuum hose set up and blue vac or appion micron gauge. For evacuation your SMAN is Smuhhh.
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I didn't mean to imply I have an SMAN, my four port is just a standard manifold with no micron gauge in it. I totally agree that it's a restriction and slows down the evacuation, however you should still be able to pull a vacuum on the thing. What I said about the manometer it's wrong though. Atleast I've never had over that could read in the micron range and I don't know that they exist
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When you say "pulling a vacuum on your gauges" , do you mean not connected to a system ?
if so try it on a recovery tank or something with volume.
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