How To Add Refrigerant to a Mini Split Air Conditioner

greetings you're looking at an LG mini-split system that right now is putting out wonderful feeling cold air and that's a good thing because summer is coming we are in the Inland Empire region of Southern California is going to be hot hot hot very soon recently this system wasn't putting out cold air I had to add refrigerant after checking the pressure realized it was low on r410a refrigerant so I'm going to show you step by step how I charged up the system so stay tuned you hello di wires I have a three-ton LG mini-split system it's a three Tong compressor connected to do indoor air conditioning units and we're currently purging the system that is removing all of the air and all of the contaminants in the system so that we have a vacuum of the system being completely first completely evacuated and then we can install new r410a refrigerant into the system so purging the system takes 20 minutes half hour and we'll come back when we're done okay so we're done evacuating all of the air all the contaminants out of the system we've successfully created a vacuum we have our pressure gauge gauge is showing a negative psi and they've been holding at that psi since I turned off vacuum machine here for over an hour that means there's no leak in the system so we're good to go we're good to start adding refrigerant back unity system as you can see there's a negative pressure and what we're gonna do is we're connecting the blue or low side hose to the larger tube on the compressor and we're going to connect the yellow service hose to the actual tank containing the r410a refrigerant we're not using the red hose or the high side at all to weigh in six pounds actually 6.17 pounds according to the lt's fifty pages worth of r410a refrigerant so weighing that in now we've got the gauge is showing and the refrigerants going in at about 120 hundred 25 psi am kind of throttling it as well either dropping so we started off at 26 pounds in tenement and now it's dropping slowly we'll weigh this in until we're down to where we need you okay so as you can see our tank weight is dropping a little bit increase the speed at which the refrigerant is flowing into the system a little bit it's now flowing in at about to 15 psi that fills up the compressor a little bit more quickly we can safely do that we don't want to go to too high on the PSI but where it is now P 15 is pretty good and you can see the weight is continuing to drop you all right we're done adding refrigerant we hit 20 pounds eleven point five ounces on the scale that's where we wanted to end up at actually there's a little off as I mentioned earlier but we're pretty close we should have nice cold air flowing throughout our house so I'm gonna close the valve on the blue side on the manifold and then close the valve on the tank okay now that our compressor is filled with refrigerant note that the PSI reading on manifold gage is to 30 psi that's what the compressor shut off it's not running we're showing to 30 psi okay so I step inside the house and turn on both of the indoor units that are connected to this compressor each indoor unit is 18,000 BTU that means each indoor unit is one and a half tons and I've got them both running they're putting out beautiful cold air feels wonderful and as you can see the PSI of the compressor it's running at about 119 120 that's ideal that's actually straight out of the of these specs 120 psi actually LG's specifies between 120 and 130 131 135 something like that but anyway we're running really well we got cold air going out it feels great thanks for watching

Channel: Do-It-Yourself and Save

Views: 217,855

Keywords: mini-split, air-conditioning, LG mini-split, heat pump, R410A, add refrigerant, air conditioner leak, mini-split charging, DIY mini-split, mini split, air conditioning mini, split ac unit

Id: 7aVvJmpJfmA

Length: 6min 50sec (410 seconds)

Published: Fri Apr 26 2019