410a and 407c POE

[SkyWalker]

since they both use POE for lubrication theoretically could you just pump down and re use the pipe work without the need for a cleaning agent like Endoflush?

this would be a packaged system, i understand the high pressures in 410a, you would only be re using the connecting pipework between indoors and outdoors.

[nike123]

If you are unsure in your pipes you could always do strength pressure test:
http://www.refrigeration-engineer.com/forums/showthread.php?p=61431

But, I am not sure that present pipe diameters will match those needed for R410.

[SkyWalker]

hi nike, thanks for the reply but i am more concerned with the cleaning of the pipes, would it be necessary?

[nike123]

hi nike, thanks for the reply but i am more concerned with the cleaning of the pipes, would it be necessary?

If you made test of oil of old equipment and found oil to be clean of contaminants, then you don't need flushing except with nitrogen to get rid of excess oil in pipe pockets.
But you still got to be sure that velocities in pipes are acceptable to ensure good oil return in new equipment.