Monday, I was doing a start up of a r410a system. Couldn't pull below 800 and could't hold below 1200 microns. Guages on manifolds didn't rise though.
Finally discovered that the seal in my hose to the liquid line was cracked. Switched out the hose and was able to pull a vac to 250, and held 505.
Without a vac guage on it, I never would have known that I wasn't pulling down the system. So that is the first correction youo should make to your procedures.
How long are the line sets open to the atmosphere, that can effect the amount of moisture you have to remove during vac, and how much is left in system since your not using a micron guage to know if youo have the system pulled down.
The more you use a micron gauge, the more you realize how critical it is to the process.
We like to use a digital micron gauge along with removing the schrader valves. Use the good quality hoses and keep vacuuming until you can hold the vacuum to at least 750. Sometimes will take over 2hrs. until this level is achieved.
I also try to change vacuum pump oil every day that I use it. Cost of doing business and this cost is calculated as is vacuum pump replacement.
Check seals often as we have had cracked/split seals and o-rings and would not hold the vacuum.
Avatar is a tribute to my Great Grandfather, Andrew Stewart. This pin was one of his advertisements for his heating and plumbing business. I never knew him but must of inherited his love of things mechanical since I am the only blue collar worker in the family
Just to clarify one thing, it isn't the r-22 or r410 that holds the moisture it is the POE oil in the r410 systems as opposed to the mineral oil in r22 systems. If you aren't using a micron gauge you are only fooling yourself and cheating your customers.
Yes ,do it right,nitro,micron guage ,etc..
However ,with what you are doing,coupled with a liquid line drier ,I'd think would handle the amount of moisture you may be leaving in.Just my opinion,time will tell.
See my Puron left open to atomosphere,in the technical section.
Exactly what moisture problems are you having???
Just a thought and I may be wrong so if I am don't take my advice lol. Why not use a megger on the ones in question to get an idea if the refrigerant is breaking down faster than it should be. Without a vac gauge your pretty much guessing if your pulling a good vac. Smaller pump for longer run evac time. On the above post from dash one of the thread posters in there said he installed a crankcase heater while evac. to help release the moisture from the oil along with installing filter driers and last but not least filter drier replacement every time the system is opened.
Originally Posted by dash
I will have to get back to you on this, I was just breifly told this yesterday and havent spoke to the Tech's yet.
The boss already orders some nice Micron Gauges today
I forgot my Pen !!!
Originally Posted by RoBoTeq
R22 is not "tougher" than the pink stuff
its more forgiving of slack install practices the minerial oil is also easier to deal with.
2. Use the correct Puron solder
this mystifies me a bit what?
anyway a micron gauge is a big help in knowing you have achieved a good vaccume
always throw in a decent dryer in your install.
410A req more exact install practices and has less room for error or short cuts
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