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Installed a 9000 BTU mini-split unit last weekend. Pics of install

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Installed a 9000 BTU mini-split unit last weekend. Pics of install

Old 04-15-2019, 06:49 PM
  #101  
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Any tips on getting the flare fittings to seal? Just installed 9000 BTU Senville. Vacuumed the system down for 1 hour. I didnít pressure test the system. This was my mistake. As soon as I released the refrigerant the two fittings closest to the indoor unit start hissing bad. At the end of the day the two 1/4Ē joints were the worst though all four leaked. I took care of the two joints closest to the indoor unit by soldering them. I still have to deal with the two flares at the condenser.

Any tips to get them to seal? What about flaretite fittings? They look promising. I also used Nylog and it didnít work.

hell I would love to solder them in place but I am worried about damaging the valves.
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Old 04-15-2019, 08:20 PM
  #102  
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We install more of these all the time. I put a Mitsubishi in my new house as a matter of fact..

Couple things for the DIY crowd....
The flares are what get most people in trouble with leaks.
Nylog or other sealant is absolutely NOT recommended by any manufacturer.
It will eventually plug off the electronic metering device an the screens in the unit.
Make a good flare and use the right torque on the flare nut. Manufacturers all have specs for torque settings.
Also make sure you pull the proper vac on it. 500 microns and then watch it for a half hour or so to see what kind of creep you have.
If you install one, energize the outdoor unit at least 12 hours before actually turning it on. There are a couple reasons for that but just do it.

These are basically throw away units if either indoor or outdoor section goes. Cost to repair is very high given the electronics involved.
You can replace the EEV but it you have a motor or board go bad it becomes questionable. The compressor???? forget about repair.
Costs more to do than just replacing the whole system.
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Old 04-15-2019, 09:16 PM
  #103  
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Originally Posted by signmansez View Post
What would you suggest using to drill the hole in a concrete block wall?
Rented a 4" core bit and the large drill from HD.
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Old 04-16-2019, 02:07 AM
  #104  
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Originally Posted by littletunny View Post
Any tips on getting the flare fittings to seal? Just installed 9000 BTU Senville. Vacuumed the system down for 1 hour. I didnít pressure test the system. This was my mistake. As soon as I released the refrigerant the two fittings closest to the indoor unit start hissing bad. At the end of the day the two 1/4Ē joints were the worst though all four leaked. I took care of the two joints closest to the indoor unit by soldering them. I still have to deal with the two flares at the condenser.

Any tips to get them to seal? What about flaretite fittings? They look promising. I also used Nylog and it didnít work.

hell I would love to solder them in place but I am worried about damaging the valves.

Making a good flare is a bit of an acquired skill, but the right tool is also very important. Orbital is the only way to go. There is also a go-nogo gage that I find very helpful.

#458R







Do you have enough tubing to remake the flares? Perhaps add some tubing with a solder coupling.
The flaretite gaskets will guarantee a reasonably made flare but are not miracle a cure.
Pressure test, pressure test, pressure test.
Vacuuming the system with a pressure test guarantees pulling contaminants into the system.
Vacuuming the system without a digital micron gauge is a waste of time.

The right tools are expensive, but easy to resell on ebay .

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Old 04-16-2019, 02:13 AM
  #105  
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Old 04-16-2019, 05:04 AM
  #106  
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Originally Posted by littletunny View Post
Any tips on getting the flare fittings to seal? Just installed 9000 BTU Senville. Vacuumed the system down for 1 hour. I didnít pressure test the system. This was my mistake. As soon as I released the refrigerant the two fittings closest to the indoor unit start hissing bad. At the end of the day the two 1/4Ē joints were the worst though all four leaked. I took care of the two joints closest to the indoor unit by soldering them. I still have to deal with the two flares at the condenser.

Any tips to get them to seal? What about flaretite fittings? They look promising. I also used Nylog and it didnít work.

hell I would love to solder them in place but I am worried about damaging the valves.
i just remade the flares with a flare tool and have never had a problem on the 4 minisplits that I have installed. You will need a very accurate scale now to weigh the Freon back in as superheat/subcool is not a way to charge these. While I think a micron gauge is useful, I donít have one and have installed probably 40 units with no problems in the past 10 years. I do have a good vacuum pump, Iím not sure Iíd trust one from Harbor Freight.
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Old 04-16-2019, 05:17 AM
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Originally Posted by littletunny View Post
Any tips on getting the flare fittings to seal? Just installed 9000 BTU Senville. Vacuumed the system down for 1 hour. I didnít pressure test the system. This was my mistake. As soon as I released the refrigerant the two fittings closest to the indoor unit start hissing bad. At the end of the day the two 1/4Ē joints were the worst though all four leaked. I took care of the two joints closest to the indoor unit by soldering them. I still have to deal with the two flares at the condenser.

Any tips to get them to seal? What about flaretite fittings? They look promising. I also used Nylog and it didnít work.

hell I would love to solder them in place but I am worried about damaging the valves.
410a systems require a deeper flare at 45 degree angle than regular traditional flares. Yellowjacket makes a specific flare tool for 410a that is nearly foolproof. Definitely worth the investment.

You can also braze them in (no solder in refrigeration), you wonít hurt the compressor.

https://www.amazon.com/Yellow-Jacket-60278-Flaring-Tool/dp/B002SB5RMA/ref=asc_df_B002SB5RMA/?tag=hyprod-20&linkCode=df0&hvadid=167139094796&hvpos=1o2&hvnetw=g&hvrand=11771324620605163935&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9060581&hvtargid=pla-370350618677&psc=1 https://www.amazon.com/Yellow-Jacket-60278-Flaring-Tool/dp/B002SB5RMA/ref=asc_df_B002SB5RMA/?tag=hyprod-20&linkCode=df0&hvadid=167139094796&hvpos=1o2&hvnetw=g&hvrand=11771324620605163935&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9060581&hvtargid=pla-370350618677&psc=1

Last edited by Jersus; 04-16-2019 at 06:03 AM.
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Old 04-16-2019, 05:44 AM
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Don't these units come with the flare fittings ready to go?
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Old 04-16-2019, 05:58 AM
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Originally Posted by forgot View Post
For those that don't want to wall mount, consider 2 pieces of strut. I did not want the vibration if any.
And rear access was better.
The keen electrician's eye will notice that the strut is facing bass ackwards. Admiral was distracting me at the time.
But it was slotted strut so it worked. Used regular guttering for all lines.
I just don't know what to do with the red drain hose. A wet ground can attract termites.
It also gets the unit up off the ground for cleaning and the Admiral on the mower with a Michelob in tow.



As far as the water drip...I always drop a large pool tablet at the point of the drip...whether itís a pool heater, home AC or the mini splits. We have all of the above and the tablets seems to keep the area clean and bug free.
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Old 04-16-2019, 06:00 AM
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Originally Posted by signmansez View Post
Don't these units come with the flare fittings ready to go?
does you no good if you cut the line set
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Old 04-16-2019, 06:11 AM
  #111  
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I just got a commercial quote for a sever room mini-split. The unit needs no more cooling than your domestic application. $ 12k!!! nice mark up if you can get it.
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Old 04-16-2019, 06:11 AM
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Originally Posted by signmansez View Post
Don't these units come with the flare fittings ready to go?
Yes, but I have found their flares (on the tubing) to have burrs and to generally be of low quality for some reason. This is a common problem.
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Old 04-16-2019, 07:38 AM
  #113  
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Originally Posted by littletunny View Post
Any tips on getting the flare fittings to seal? Just installed 9000 BTU Senville. Vacuumed the system down for 1 hour. I didnít pressure test the system. This was my mistake. As soon as I released the refrigerant the two fittings closest to the indoor unit start hissing bad. At the end of the day the two 1/4Ē joints were the worst though all four leaked. I took care of the two joints closest to the indoor unit by soldering them. I still have to deal with the two flares at the condenser.

Any tips to get them to seal? What about flaretite fittings? They look promising. I also used Nylog and it didnít work.

hell I would love to solder them in place but I am worried about damaging the valves.
Unfortunately dude, since you wasted your charge, you're going to have to call in a pro to recharge it for you since you can't buy R410a on the open market anymore.

In the future, make sure you pull a vacuum and then let it sit with a gauge on it for a while to ensure the vacuum is held. That would have caught this.
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Old 04-16-2019, 08:11 AM
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Originally Posted by lugoismad View Post
Unfortunately dude, since you wasted your charge, you're going to have to call in a pro to recharge it for you since you can't buy R410a on the open market anymore.

In the future, make sure you pull a vacuum and then let it sit with a gauge on it for a while to ensure the vacuum is held. That would have caught this.

https://refrigeranthq.com/f-a-q/wher...a-refrigerant/

https://www.ebay.com/p/DuPont-R410a-...d=173154398516

https://www.johnstonesupply.com/shop...rigerant/R410A
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Old 04-16-2019, 08:18 AM
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"One thing to note is that with some refrigerants you need to either be 608 or 609 Environmental Protection Agency certified in order to purchase. With R-410A, since it is an HFC refrigerant, you DO need to be certified in order to purchase or handle. This changed as of January 1st, 2018. Before then you could buy without a license as of today you will need to be certified."
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Old 04-16-2019, 08:52 AM
  #116  
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Massage parlors, speeding and marijuana are all illegal things also, the prohibitive thing is buying a scale that can weigh 25# VERY accurately (paging Big Al...).
If he is asking questions here, he probably does need to call a professional to weigh in the freon, but the fact that he does not have a license is pretty far down my list...
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Old 04-16-2019, 11:23 AM
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Originally Posted by lugoismad View Post
Unfortunately dude, since you wasted your charge, you're going to have to call in a pro to recharge it for you since you can't buy R410a on the open market anymore.
.
I bought a 20# jug on Ebay for $104 from a guy in Miami. It is not a regulated refrigerant like 12 and 22
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Old 04-16-2019, 11:55 AM
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FYI. I saw a 2 year old Mitsubishi that said made in Mexico on the condenser. I thought they were made in Japan.
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Old 04-16-2019, 12:28 PM
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Sanyo, Mitsubishi, Fujitsu, they are all good. I love installing these units.
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Old 04-19-2019, 09:45 AM
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Originally Posted by SeaBoss21 View Post
Sanyo, Mitsubishi, Fujitsu, they are all good. I love installing these units.
Have you had to clean an evaporator yet? Curious what method to use myself when that day comes.
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