old r22 pipes with new r410a unit

[dalechamberlain]

So i just replaced a small ducted r22 unit with a r410a ducted unit and used the old piping of around 10 meters as it was to hard to replace. i didnt use any flushes, i blew it out with nitrogen for awhile and installed a bi-flow suction line filter.
I didnt realise it was such a big deal with the oils until now.
Do i need to be worried about my work? I dont want it to fail.
Should i leave it as is?
Has anyone done this and it failed?

[RANGER1]

Copper tube may not be rated to higher operating pressure.

[Dermtheworm]

Had a discussion about this with my colleague, I can’t see how by using nitrogen you would flush mineral oil out of pipework you would need quite a bit of nirtrogen? What is the correct procedure when using existing pipework which has had mineral oil to then use a system with polyester?

[dalechamberlain]

Just wondering if its such an issue. I pressurized it a couple times and when you let the nitrogen out a bit of oil comes out

[cadwaladr]

I have flushed transport systems with automotive brake cleaner but I isolate the pipes

[RANGER1]

Some articles on retrofit.
Sound like you should have done your research before you did the job!
Maybe it's not to late if you have not opened valves yet?
Warranty may be a problem also if not done to manufacturers specification.
Filter you installed could help.
What was wrong with oil unit?


http://www.contractingbusiness.com/refrigeration/flushing-techniques-r-22-r-410a-conversions

http://zumbrunnen.com/converting-from-an-r22-split-system-to-r410a/

http://www.refrigeration-engineer.com/forums/showthread.php?20895-R22-to-R410-using-existing-pipework

[dalechamberlain]

Yes research first then work. Old compressor was locked rotor, wasn't burnt out