Old lineset

SeanBeans

so I just bought a house in Colorado.. it is part of a condo community and I guess you had the choice to have AC installed at the time the buildings were built.

The Homeowners before me opted to have none.

The refrigerant lines are ran, from my attic to the side of the house.

They capped the lines up in the attic but outside... Nope.

The lines are open and the first few inches are filled with dust, pollen, and whatever else.

I don’t think I have the option to run a new lineset outside exposed so I’m thinking a really great flush?

What would you guys do?

ChrisJ

SeanBeans said:

so I just bought a house in Colorado.. it is part of a condo community and I guess you had the choice to have AC installed at the time the buildings were built.



The Homeowners before me opted to have none.



The refrigerant lines are ran, from my attic to the side of the house.



They capped the lines up in the attic but outside... Nope.



The lines are open and the first few inches are filled with dust, pollen, and whatever else.



I don’t think I have the option to run a new lineset outside exposed so I’m thinking a really great flush?



What would you guys do?

I'm betting R11 flush.

What sizes are the lines and what size unit do you need?

pecmsg

I wouldn’t chance it. The POE oil used today is a cleaning solvent so anything in there WILL come back to the compressor.

If they insist a filter drier at the air handler and suction filter at the compressor. At least one change of both!

SeanBeans

@ChrisJ

They ran 3/4 3/8 line.

I haven’t looked fully into sizing yet, just moved in. But I imagine it’s going to be 2ton MAYBE 2.5. Lots of windows and sun.

EBEBRATT-Ed

doubtful that dust and dirt migrated very far inside with the other ends capped especially with the long riser to the attic. I would cut it back 4' and take a look....then flush

unclejohn

A good nitrogen blast into each line into a white kitchen trash bag a see what comes out and go from there. And for sure over size dryers.

EBEBRATT-Ed

@unclejohn

Agreed

SeanBeans

Thanks guys!

I kinda figured I would be flushing and blasting with nitro.. probably do it a few times to be safe

Dave0176

I don’t like flushing anything because then you have the flushing agent to deal with, I’ve found blowing the lines out with Nitro works just fine, even on 22 to 410 conversions. Put a suction drier in for a couple weeks and a liquid drier before the txv and you’ll be fine.