Senville LETO Series Mini Split Air Conditioner Heat Pump, 9000 BTU 208/230V, Inverter, Works with Alexa, 0.75 Ton, White

This is a great, high-quality product that functions well. I thoroughly recommend the Senville for quality and performance.The install is a difficult level DIY and should only be attempted after proper research and with proper tools.Physically installing the units is easy. Wiring the units is not difficult but is time consuming, especially accounting for running a dedicated 20A electrical circuit.Line set installation is more involved. I chose to hang the inside unit before attaching the line set because of how I chose to run the refrigerant piping inside the room and then straight through the wall to the outside unit. I made my own wall pass-through sleeve from 3" pvc to give a little more working space. The included sleeve is very thin and flimsy. Line set flare nuts MUST be torqued to spec. I had one nut that failed and had to remove, replace with an included extra, and reflare the connection when I found the leak during the first pressure test. I shortened the refrigerant piping at the outside unit to fit with no looping of pipes. I used an eccentric flaring tool to remake the connection after shortening.Next step of pressure testing with nitrogen MUST NOT BE OMITTED. You will need a HVAC charging manifold, special fittings, a micron vacuum gauge, HVAC leak test soap, a compressed nitrogen tank and regulator, and a vacuum pump. A competent pro installer will do this--but many HVAC techs skip the pressure test step.I pressure tested and found the bad flare nut leak, repaired it, and pressure tested again to 300psi nitrogen. This forces most air and water out of the lines. I left the lines on pressure, applied leak test soap and left the set up for over 1 hour. There was absolutely no leakage according to the HVAC manifold gauge.After pressure testing, a vacuum test was performed using a micron vacuum gauge to make sure all nitrogen, air and water vapor was removed from the lines. You will need special fittings as mentioned, to insure that the lines remain isolated from the pump after evacuating. I vacuumed down to 220microns and let it sit for 30+ minutes. The gauge remained well below 300 microns. (the standard is to remain below 500 microns). This step double checks for leakage and confirms removal of all gasses and water before releasing the factory charge into the system. Next, isolate the gauge from the system using the special fittings, and release the refrigerant charge from the compressor into the system. After a final check for leaks after removing all gauges and fittings, the system was ready to power up and test run.Note: the flare nuts are crudely shaped on the outside (seem to be cast, rather than machined) so normal open ended wrenches do not fit them well. You will have to use adjustable wrenches to adjust them when installing. Using a torque wrench on those flare nuts is difficult because of the non-standard finish and sizing. A $175 adjustable wrench head HVAC torque wrench (made by Yellow Jacket) would really assist here, but I had a standard torque wrench with crow's foot wrench adapters. I made it work... but that's not an easy way to do it. I doubt many techs carry the special torque wrench and will just do the flare nuts by feel based on experience.The test run of the unit revealed no leaks, so I wrapped up the line set at the connection points and finished the install. I used a line set cover flashing to protect the lines where they emerged from the outside wall. Zip ties where needed to secure the wrapping tape. Big HVAC type zip ties screwed to the wall to mount the indoor line set in permanent fashion. double checked the drain line was working properly without restriction by pouring water in the top of the inside unit and verifying full drainage. I left the primary drain line joint uncovered inside so I could have access if there was ever a blockage.The unit heats wonderfully, cooling is great, too, but I will have to confirm how that works on a really hot day this summer. You will have to run the cooling check on manual cool override if temperature is below 62º outside (it was cool here on the test day). The air output on cooling feels ice-cold.Spend the time and money to install it correctly and the Senville will serve you well, I think. If you are not comfortable doing it DIY, then hire a good installer.You will not have factory warranty without a professional installer according to Senville. I chose DIY anyway after researching the process and finding than some installers skip the pressure test. (Senville in fact does not insist on a pressure test in the install manual.)22 months in, I could not be more pleased. Keeps my garage/workshop comfortable year round (outside temps ranging from 7° to 97°) and has very little impact on my power bill. Just keep the filters and fins clean for best efficiency. So far, I have not needed to clean the blower wheel. No problems with the condensate drain at all.

This is a 9000 BTU LETO Series 120 Volt , This unit was not bad to install, ( Except for drilling through part of a concrete lintel. it had to be done in this layout /Configuration, Over a door , only logical place to locate it to heat multiple rooms with a single unit..) It has only been a week so here's what's happened so far,, it cools and heats nicely, ~45 * F air in Cooling mode on 75 * day , blows over 122* F air in heat mode on a <50* day/Nite. Hope it blows nice hot Air in >20* days in central MD area, we don't get too awfully cold here so i think it will be ok..I only used 10' of the 16' line set, it was a short run. I ran 12-2 with grd and a 15 Amp circuit, easy to Evacuate/Vacum lines since i have a pump and gauges. Unit was packaged VERY nice and solid, sealed unit so essentially should be clean n not have leaks, Indoor unit had Nitrogen pressure, So that was great to know it held some pressure since manufactured and was clean with Inert NI gas, Outdoor unit was Pressurized /Precharged. after doing new Flares with, Thorstone 7 Dies Flaring Tool Set Eccentric Cone Type Flaring Set, Then pulled a full Vac on it let sit for an hour, No change, no leaks, Leak tested with Nitrogen, Good to Go,, let 50 PSI of charge ( RE: 1/4 turn X 5 Sec.) into system for 1 HR tested for leaks with Simple Green , It foams up great for leak detecting, (its What I 've used for Leak Testing for yrs) no change in pressure on Gauge set No leaks detected. Let the Charge go and retested for leaks Again To be confident it is ok, Had my buddy who is Certified/ Licensed HVAC tech do the parts required for Warranty, after all, I do want the Warranty just in case!! It has so many options /Modes, It Heats/Cools /Dries/FAN / AUTO , ECO/ Fan speed manual fan speed operation AUTO mode We really like this system Its SOOO QUIET, more to follow if issues pop up and if it just keeps working properly. It is used in a small apartment, Under A raised rancher style house ! 350-400 Sq/ft. Concrete slab under carpet, Cinder block walls built in, 1970, It just stays cool, Colder than rest of house unless I'm burning the wood stove and blowing hot air in, Which is getting old!!! So bring on the mini-split alternative form of efficient 20+ SEER AC, and heating EER 12.5 at 120V.. I do recommend this unit . We like it so far It fired right up, No issues thank good ness,, That's a good sign!!