Do driers come with moisture in them?

Posted by Bubba on June 22, 2008, 5:42 pm

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Gary,
Shame on you for not using driers on R-22 new installations. There is
no magic to it. If you use a drier, have good brazing techniques and
evacuate to 500 microns or less you will have systems that seem to
last forever. I know this for a fact as Ive done it for about 25
years. I still find old shit out there Ive installed a long long time
ago. Rusted to hell and still working.
Id really like to know what you use (hose type/size and pump type) to
get a new install to pump down to 500 micron (and hold) in 20 mins.
I can pump down a lineset and indoor coil and still not get that to
happen in 20 mins.
Other than that, the new R410a systems usually hold a lot more
refrigerant than the previous less efficient R-22 10 SEER systems.
Larger coils too. That and the fact that you cant remove the moisture
from the POE oil in a R410a system.
Bubba

Posted by Gary on June 22, 2008, 9:42 pm

Why would you put a dryer in a new installation when you have a new
lineset & a condenser with a factory installed bi-flow dryer?
It seems redundant. I rarely have any problems with my new installations
for years to come. The only real problem I've had is indoor coil leaks
lately. Are you going to blame that on not using a dryer?
I mainly use Ritchie/Yellow Jacket gauges & hoses. I got tired of Robinair
crap. The 3/8" hoses pump down better but I usually use the standard 1/4"
for both 410 & 22. I used to use Robinair & JB vacuum pumps but last year
I tried a Gemco pump & it works great. I put a reversing valve in Friday &
it pumped down to 425 microns in less than 20 min with a dryer. Very short
lineset less than 10 ft. It didn't hold but after about another ten
minutes it held at 425 microns. Lately I've been using a Fieldpiece vacuum
gauge. It's pretty cool because you can set a high & low alarm to whatever
microns you want it to go off at.

Posted by Bubba on June 23, 2008, 7:36 am

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Well, actually I dont use a dryer on a new installation. I use a
"drier" :-)
I use them if the new unit does NOT have a factory drier. Ones like
Tempstar come with a drier shipped separately and are full size (16
cu. in) instead of those silly little 3, 5 or 6 cu. in. ones I see in
so many brands.
Yep, I see indoor coil leaks too and Nope I dont blame that on driers.
I too got tired of Robinair crap only I caught on long ago about their
junk.
I rarely see a 10 ft line set. I usually have 30 ft or more.
I use the JB 6 cfm vac pump (although only a 3 cfm is needed) and
standard gauges with the 1/4 inch high press hoses with seal fittings
on the ends.
The JB vac gauge is digital and works well too, just doesnt seem to do
it in 20 mins. More like 1 hr maybe. I'll double check the next one.
Bubba

Posted by KJPRO on June 23, 2008, 3:35 pm

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And the larger 5 ton units come with a 30 cu. in

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Do driers come with moisture in them? - Page 4