What tools do you have for rent? I am seriously thinking of installing this Fujitsu 33 SEER unit with XLTH myself https://www.fujitsugeneral.com/us/resources/pdf/support/downloads/submittal-sheets/9RLS3Y-RLS3H.pdf because some of the hvac contractors I've met with do not give me a warm fuzzy feeling if they actually do the install with proper equipment or procedures. Some of these contractors sub the jobs out and won't let me speak to their subs to find out what equipment or procedures they use.

Example: one contractor says most of the leaks in their experience through the years of mini split installs is in the evaporator, so they braze the connection at the evaporator instead of using a flare. When asked if they purge the lines with Nitrogen while brazing (to prevent oxidation), their answer was no!


I asked another contractor if they pressure test with Nitrogen and the answer was no! They just do a vacuum, if no leaks, they let the refrigerant out! Not going to name names but this was a Fujitsu Elite contractor.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

I can see the logic to brazing, as dependig upon what direction you want the line set I think it may be easier to cut off the connection on the evaporator, have a much shorter lever arm there to stress it, then just pull and secure the line set where it needs to be.

Don’t know enough about precautions on brazing and gas use, but if the systems are line mine, the line set is not lrechsrged, the condenser is. So one could pull hard vacuum on the evaporator afterwards fwiw.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

Purging with Nitrogen when brazing is to prevent formation of carbon bits inside the copper line that could flake off and clog small passages.

I think most line sets are not pre-charged except MrCool DIY kits that Vstech mentioned earlier.

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked