HVAC-Talk: Heating, Air & Refrigeration Discussion banner
Cancel
Create thread New Forums

Itsiceman style big ass evac hoses Worth it?

Jump to Latest
681 - 700 of 1,053 Posts
#681 ·
heatingman said:
But I wonder if I could use the recovery machine as the prime mover for a AXV to send cold refrigerant around the shell of a cold trap.

Might be a good next garage project


Sent from my iPhone using Tapatalk
Click to expand...
Or just get a air powered venturi vacuum pump and run till it dries out then switch over :)
 
Save
Like Like
Discussion starter · #682 ·
itsiceman said:
Or just get a air powered venturi vacuum pump and run till it dries out then switch over :)
Click to expand...
How deep would something like that pull?

The venturi vacuum water pumps in steam systems wont pull super low, maybe 20” - then again Ive never really tried to run them super low.


Sent from my iPhone using Tapatalk
 
Discussion starter · #685 ·
I know you were kidding about the ice. But I honestly think it was something other then water.

I pulled down that water loaded chiller no problem. Never even changed the oil.


Sent from my iPhone using Tapatalk
 
#686 ·
thekux said:
Still limited by the quarter inch connections

Sent from my SM-J700T using Tapatalk
Click to expand...
What's the limit? I pulled a tank down faster with a 3/8 YJ hose vs a 3/4 inch hose and that was with a 1.35 CFM pump. There are many posts and threads leading up to this one you may have missed out on. Is there something you'd like to see that would convince you it makes a difference.
 
Save
Like Like
#687 ·
Appion had a chart showing times to pull a 50 lb tank with ÂĽ, â…ś and we hoses 6 foot long and ÂĽ connections at both ends of all 3 hoses. The difference was huge with the larger hose even though there were two connections at both ends.
 
Save
Like Like
Discussion starter · #688 ·
thekux said:
Still limited by the quarter inch connections

Sent from my SM-J700T using Tapatalk
Click to expand...
Thats true, but thats not what was causing this. Ive pulled a ton of vacuums in my career, and I cant remember one that gave me this much grief. Even when I pulled through a manifold, and left cores in, and had 1/4” hose for everything.

There was some type of additive in this system or something. The oil in the old compressor was sort of green - I assumed from dye, but now IDK.

As a test I might take one of my recovery cylinders and add a few quarts of water to it and see what the pump does.

Of course after I tear these down and get them cleaned up again.


Sent from my iPhone using Tapatalk
 
#689 ·
heatingman said:
Thats true, but thats not what was causing this. Ive pulled a ton of vacuums in my career, and I cant remember one that gave me this much grief. Even when I pulled through a manifold, and left cores in, and had 1/4” hose for everything.

There was some type of additive in this system or something. The oil in the old compressor was sort of green - I assumed from dye, but now IDK.

As a test I might take one of my recovery cylinders and add a few quarts of water to it and see what the pump does.

Of course after I tear these down and get them cleaned up again.


Sent from my iPhone using Tapatalk
Click to expand...
Green slime?
 
Discussion starter · #692 ·
Image


This was about the first hour of pull down. The spike to atmospheric was me trying a nitro purge - did almost nothing.

The bump ups are me isolating to change oil. I stopped recording obviously.

Ended up using 2 pumps, one on the suction line, one on the discharge.

Finally got to 500 microns after 4 or 5 hours. During the decay, it went up to 1550. It was getting dark, and I installed an oversized drier, so I called it good enough.


Sent from my iPhone using Tapatalk
 
Discussion starter · #695 ·
Maybe it was water, in that video, 2500 was about the stall point.

What really gets me is the unit is 20 years old, and everything is factory, compressor, drier, everything. Pulled 1 lb short of the factory charge out, which could easily be unit testing over the years. The moisture indicator showed dry the entire time.


Sent from my iPhone using Tapatalk
 
Discussion starter · #697 ·
Im guessing a liquid slug killed it, or a duration of high head pressure from dirty a condenser. She would run, but not pump at all. Coils in a real bad spot for splitting. About 2 feet from the edge of the roof.

After the new one was up and running, it ran like a champ. 16 sc, 20 sh. 70 suction, 245 head at 82 ambient. Coil was a little dirty, but other then that - running well for an old heap of junk.


Sent from my iPhone using Tapatalk
 
#700 ·
heatingman said:
Thats true, but thats not what was causing this. Ive pulled a ton of vacuums in my career, and I cant remember one that gave me this much grief. Even when I pulled through a manifold, and left cores in, and had 1/4” hose for everything.

There was some type of additive in this system or something. The oil in the old compressor was sort of green - I assumed from dye, but now IDK.

As a test I might take one of my recovery cylinders and add a few quarts of water to it and see what the pump does.

Of course after I tear these down and get them cleaned up again.


Sent from my iPhone using Tapatalk
Click to expand...
I had the exact same situation a couple days ago. Contaminated oil. Several oil changes. Oil in the system was bright green which I assumed was dye or an additive. Wondering if you if you did an acid test?
 
Save
Like Like
681 - 700 of 1,053 Posts
You have insufficient privileges to reply here.
About this Discussion
1.1K Replies
39 Participants
Last post:
R600a
HVAC-Talk: Heating, Air & Refrigeration Discussion
posts
5M
members
275K
Since
2000
The #1 HVACR Community
Full Forum Listing
Explore Our Forums
AOP Residential HVAC/Refrigeration(Beenthere Zone) General Discussion Tech to Tech Chat - Residential Controls Refrigeration & Ice Making