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Thread: Here's how to vacuum
03-28-2011, 07:26 PM #40
03-28-2011, 07:36 PM #41
The display shows pressure relative to absolute zero, which is interpreted from the more sensitive type of sensor used in these instruments, and is displayed in a much higher resolution known to us as microns. This should be correctly termed as microns of mercury.
As a note, some sensors are designed to take pressure. It depends on how they are manufactured.Reality is merely an illusion, albeit a very persistent one.
03-28-2011, 07:44 PM #42
If I did, I would build one out of some very large copper piping or fittings (4" or better) and build a bucket in a bucket type arrangement with provisions to drain any water from inside and fill the inner bucket with a salt/ice/water brine and draw vacuum through the space between the two buckets.
I don't know if I've adequately explained what is in my head. Probably not.
Suffice it to say, fortunately, I've never had to use one.
03-28-2011, 07:47 PM #43
03-28-2011, 07:50 PM #44
Say againAlways here
03-28-2011, 07:59 PM #45
03-28-2011, 07:59 PM #46
03-28-2011, 08:02 PM #47
03-28-2011, 08:05 PM #48
03-28-2011, 08:09 PM #49
Yeah I was referring to your post. After taking the time. I would much rather see you valve off. That little hiss can suck much moister into the system ultra fast.Always here
03-28-2011, 08:12 PM #50
I work on quite a wide variety of equipment sizes, from stuff that holds a few ounces to stuff that holds almost a ton of refrigerant.
When possible, I use a core remover with a side access fitting for the micron gauge. I guess that is going to let some air in, too. Just never thought about it, I guess.
03-28-2011, 08:30 PM #51Regular Guest
- Join Date
- May 2010
Some people are just way too nit-picky. You are always going to let a minut amount of air enter a system when pulling a vacuum and then removing the hoses. Get over it. There is nothing you can do about it.
03-28-2011, 08:37 PM #52
When you use two core removers with side access you can install ball valve before the sensor on the vacuum gauge. The YJ comes with one. Or, you could forget about the side access port all together and install your vacuum gauge on the end of the core removal tool (sorta like you have it now) This would allow you to break the vacuum with the charge in the new unit just enough to have a positive pressure in the line set and coil, then close the out door unit off again, remove vacuum gauge (because you can now valve off) and install all hoses and charge line set with any additional needed charge then re-open the service valve. Many ways to accomplish this, but the goal is to have a positive pressure in the line set and protect the vacuum gauge sensor before removing anything from the evacuated line set.
Last edited by energy star; 03-28-2011 at 08:54 PM.Always here