I am surprised in these types of discussions why you don't seem to see P.O.E. mentioned more.P.O.E. is an EXCELLANT cleaner.
Any garbage in the old lineset will get washed out & end up in the system.
How many times have you cut into a lineset to see a light black film on the walls?
What do you think this would do to the life expectancy of a new unit once it is wiped clean from the piping & circulating in the oil?
Did the first guy use nitrogen?
How much oxidation from not using nitro will be dislodged into the new system?
It is just a poor choice for more than one reason!!!
you can't -- I swear if i ever saw a tech follow installation instructions, i'd faint.
I've used the same line sets on Payne systems, but I always change the line sets on Carriers equipment.
Originally Posted by Llama
I'm not communicating something well I guess.
How does the homeowner determine if the manufacturer's install instructions have been met? In this example, what are Carrier's install instructions?
As I have said above, the installer appears to be planning on reusing the existing lines, knowing full well that the old set is R22 and that the new set is R410a.
I fully plan on being down in the basement with the installer the entire time, but other than a few specific items I have read about here I will have no idea what to ask him or if he is doing what he says.
How do I determine if the manufacturer's install instructions have been met? How do I protect myself from the installer failing to comply with the manufacturer's install instructions?
"Pick a good installer" is certainly insufficient because what that usually means is "Pick an installer as good as me"; neither recommendation actively protects the homeowner from installer error.
when I quote the customer the cost of a new line set, it's definitely cheaper for the customer for me to spend an hour or so to change driers and vacuum down during PM -- the customer pays for the driers & extra time.
Nitrogen purge will get most of it out, and a few degrees drop on a drier doesn't brake my heart either. I'm scared to not change line sets on Carrier's performance or Infinity systems.
I save the customer several hundred dollars, and I get a PM contract
I love it
Originally Posted by aintitfun
emcoasthvacr, You think it is more cost effective to go back and change driers, than just using the proper method of rx11 flush! Is it really that difficult and expensive to do it right? You readilly admit that you think you have seen some signs that you are mixing the oils, but what the hell , its just a little temperature drop across driers! Whats next, ditching the vacum pump, it would save you time, and lets face it, those vacum pumps are not cheap, its only a little moisture/non-condensables, I know we can just change the driers out at pm time. COME ON!
Lots of improperly sized lines around here, so they get changed if we dont have to do major remodel work, or we leave the old line set in and run it on the outside if the homeowner doesnt mind the sheetmetal cover.
If sized properly or not cost effective to replace, then flush, by specs, rx11 in then nitrogen. Vacuum with a micron gauge, but thats regardless of new or old linesets. More nitrogen if theres still moisture in the lines.
I've not seen anyone recomend a double filter drier on a residential system unless cleaning up a burnout. Then they recomend removing the suction drier in a few days of run time. I also change filter driers at 3 degrees of differential, so I dont know how a few degrees is ok for a system.
Forgive me if I'm wrong. (Flame away)
But I thought that the major reason for replacing your refrigeration pipework when converting from R22 to R410A refrigerant was because the cu pipe used for R22 have a thinner wall than R410A refrigerant piping.
Due to the much higher (practically double) pressures incurred with R410A, we are told here in Oz the R22 pipe can not take the pressure and then will split/crack/leak.
This is apart from the oil issue.
We have always changed pipework, no matter if walls have had to be removed to do so.
Is this different in the U.S?