changing line set

[tinnertech]

Is it mandatory to replace the line set if your replacing the a coil and condensor and going from r22 to r410a? I've heard conflicting answers. Thanks for the help!

[monkey spanners]

If i was putting a system in for myself i would run a new line set, i would prefer to run a new line set on customers work too, but often they only look at the price.
Is it mandatory? No, Is it advisable? Yes.

[Brian_UK]

Also depends on the quality of the existing pipework, is it suitable for the potential higher pressure?

[kssoin]

Also depends on the quality of the existing pipework, is it suitable for the potential higher pressure?

Hi Brian_UK,
for R22 head pressures are abt 300 psig max.
how high is it for R410 gas.
Regards
Kssoin

[Peter_1]

Kssoin, you can find this pressure in a log p/h chart of R410a, almost double.
Will yu not change the compressors?
If you perform after your job a pressure test on 1.1 x the max pressure your R410a system ever will see and it withstands this test pressure, well, then you can let your system run on the old pipework.