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Discussion Starter · #1 ·
So this may be one of those "I am pretty sure I know the answer, but just need verification" questions.

Last year I installed a new mini split system and I will be the first to admit that while the tools can get expensive, having high quality and CORRECT tools made the installation a breeze and I actually enjoyed the challenge and it has been working very well.

Now, I am looking to install another one that is a 2 zone system.

In the manual, it says that the nominal efficiency was rated at 16.4 ft (5 meters). For one of my zones, I will be right at this line set length, so no problem there. The other zone will require a longer line set, thus requiring me to add refrigerant per the specs in the manual.

Since this is a new install, I don't need to evacuate, correct? (I mean beyond the standard/initial nitrogen test and vacuum pull). To put it another way, the condenser has enough r410a for 16.4 ft and it is sealed in until I release it. Is the process then

a.) Send nitrogen in for leak test
b.) Vacuum the line set
c.) Add the extra refrigerant
d.) Release what is stored in the compressor

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