Kaizen
Well-known member
I installed an LG 32k 3 head minisplit 5 years ago. Zero issues till a few weeks back i got a low refrigerant code on the head unit, I have a sniffer so found the one fitting that had a small leak. Bubble tested and figured i would just retorque it. Minute i moved the fitting it blew. So now i've fixed that fitting and trying to pull a good vacuum and having issues getting below 500microns with a standing test going up to 650. When i did this last time i purged with nitrogen, used the same equipment for a tripple evacuation, and got it down to around 100 microns.
So far i've ....
Verified the vacuum gauge and pump are working correct by pulling down to 50microns in 30 seconds.
Pressure tested the system at 200psi for 2 hours and soaped the joints. passed both.
Purged the system in the low pressure line and pushed the schrader on the high side for a few minutes.
Did a tripple evacuation breaking the vacuum with nitrogen.
Vacuum is a two stage half horse with clean oil. Am i not going to get down to lower numbers due to oil from previous refrigerant? Something I'm missing? I have a valve core removal tool and a CPS vacuum gauge on the low side. The only strange thing I noticed that i had not seen before was a few times when I stopped vacuuming the microns decreased by 20 or 30. Usually is stops and climbs.
So far i've ....
Verified the vacuum gauge and pump are working correct by pulling down to 50microns in 30 seconds.
Pressure tested the system at 200psi for 2 hours and soaped the joints. passed both.
Purged the system in the low pressure line and pushed the schrader on the high side for a few minutes.
Did a tripple evacuation breaking the vacuum with nitrogen.
Vacuum is a two stage half horse with clean oil. Am i not going to get down to lower numbers due to oil from previous refrigerant? Something I'm missing? I have a valve core removal tool and a CPS vacuum gauge on the low side. The only strange thing I noticed that i had not seen before was a few times when I stopped vacuuming the microns decreased by 20 or 30. Usually is stops and climbs.