Replacing R410a minisplit: Lineset cleaning, pressure testing, and purging
Should I use a cleaner designed for converting from R22 to R410a linesets to clean a lineset that will only replace a R410a mini split?
I am replacing a 7.5 year old Samsung 1 ton unit with a Fijitsu 1 ton unit. These are both single units. They both require 1/4″ and 3/8″ lines.
I’ve gotten mixed answers from many HVAC professionals on this question. It seems like the wild west here in Wisconsin on mini-splits (and other HVAC subjects).
Also, to be clearer, I will be purging each line with nitrogen, pressure testing to 500 psi with nitrogen, and using a vacuum pump and micron level meter and plan to purge down to at least 150 microns.
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