I just went back and re-read my own post! Then realized what you mean! (Hey, I'm old)!
Yeah, they come with 4.3 pounds, and we only added 3.3 pounds after the repair.
The manual says you have to remove some, if you run a short line-set. *
At the time, I was planing to make a short Test loop to simulate a line-set.
But due to mislabeled tubing, I ended up with a really short 1/4" test loop.
So, I decided we should hold back on filling it all the way up..
Only later, did I decide to buy a brand new IDU and a 15' line set.
*Note:
This model is loaded for 33 feet of line set. For each foot you add to the length,
you have to add 0.27 oz of R410A.
Likewise, if you go under 33 feet (I assume).
33-15=18 x .27 is only about 5 oz.. So, we need to carefully add 11 oz..?.
So, we have decided to try running it with 3.3 pounds
for a while to see how it does, my HVAC guy thinks it's safe..
(Not really a mini-split guy). I'm not sure, since I'm not schooled on the effects of running low refer..
When we ran the T-run mode to filter out any impurities, etc
the IDU and the line set got down to -20 F.
To me, that seems like the system is really working pretty good.
When heating on a really cold day, the outdoor coil has to be colder than
the outdoor air, so it can pick up it's heat. And -20F is indeed pretty cold..
(At least to me)..