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HVAC Forums => HVAC Help => Topic started by: Shane on May 01, 2017, 05:28:16 PM

Title: A/C lineset
Post by: Shane on May 01, 2017, 05:28:16 PM
Hi Guys.

I went too quote a job today, The home owners want to replace there existing R22 A/C unit, Normally I would replace the line set but in this house the basement is finished and looks like it about 40ft in length. Is there a product out  there to flush the line set so I can re use it when I install the new R410A system? I'm just looking to see if anyone has suggestions before I tell them they have to put a bunch of holes in the ceiling. The current unit is still running so I'm not worried about a burnout


Title: Re: A/C lineset
Post by: Admin on May 01, 2017, 06:20:31 PM
Take a look at this product,

Title: Re: A/C lineset
Post by: Gasguy79 on May 01, 2017, 07:24:54 PM
The rx flush works good with a good sweep of nitro also
But some manufactures won't honnor warranty if line set was not replaced so if it was me I'd push for new lineset some minor drywall repairs and a job done the right way
Title: Re: A/C lineset
Post by: harshal on May 01, 2017, 08:10:35 PM
Sometimes it's not possible to re the lineset in the finished basement.i would use triple vacuum procedure in those cases.use nitrogen to flush the lineset. U want to remove the oil as much possible. R 22 system has less oil than 410a system.so you'd should be ok.
Title: Re: A/C lineset
Post by: Porcupinepuffer on May 02, 2017, 03:56:08 AM
We've used some of these flush kit products in situations like this. It's basically like a brake cleaner that you force into the lines. You'll see it run out the other end and it takes any old leftover oil with it. Those units haven't had any issues. Blowing out with nitrogen and flushing a few more times may be necessary if you come across lines that are really oily.
Title: Re: A/C lineset
Post by: Viperi on May 03, 2017, 05:13:07 PM
used it a few times. How i use it when the evap is lower then the condenser. cut the coil out and braze the liquid and suction together to make a loop.  go out side and pinch the liquid  and shoot alittle flush kit into the suction till it comes out the liquid.  nitrogen it.  then reverse the process with the suction.

this way the house dont stink..