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My new Gree mini split install

SALIV8

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Joined
Dec 11, 2008
Messages
2,114
Location
chicago and s/w michigan
First and foremost I want to thank JustinJoyal for all of his significant professional help, guidance, advice, and expertise.

Secondly, thanks to all of you guys (pros and diy'ers like me) for posting your installs, experiences, tips and tricks, suggestions, etc.

My new Gree is a (4) indoor 9k Terra system with a 30k outdoor condenser. The smallest indoor units Gree offer are 9k, unfortunately, and I got a great deal on the 30k condenser. It is oversized for the rooms but the heating output and savings I couldn't pass up. It's rated at 21 SEER and 10.2 HSPF.

I purchased most everything with Carey, who's a great guy and very helpful at Comfortup.com and they are manufacturer supported by Gree. The wall sleeves and venture tape was purchased through supplyhouse.com, and the snug fit cushion clamps were through mcmaster.com

Gree tech has been extremely helpful and has taken the time to answer several questions and even go so far as to give me some tips. I told them I'm licensed when I called and they never questioned it.

I did almost the complete install myself, with some help from my dad and a little help from my wife. It helps to have a second hand when running the line sets over 15', setting the indoor heads, and for my location, the outdoor unit also.

I had a hvac tech approved by my electrical company come out to make the final line set connections, evac, release and add some 410a based on line set lengths because I want the local rebates available and more importantly the Gree manufacturer warranty of 5 yr parts and 7 yr compressor.

Tips I have been told by Gree tech: pump down less than 500 microns even to 250-300 is ideal. Although warranty will support up to 500 microns. Use the Gree factory flare nuts at each connection as opposed to the pre made random line set flare nuts that come with the set. They see failures regarding that. You must use a minimum of 10' line set with any indoor head distance from condenser. The instructions call out more wall to condenser spacing than is actually needed. 8" is the minimum distance they will warranty when wall mounted and the Gree tech actually sent me that in an email. I was questioning this because the wall mounts available do not allow the distance needed that is called out in their paperwork.

Their instructions seem clear and concise. They are manufactured by a company that makes the most residential and light commercial a/c units in the world supposedly.

All indoor units and the outdoor unit is seriously whisper quiet (even when all 4 indoor units are in full cooling mode with a large load 90+* outside) with literally zero vibrations, which I was wondering about since the outdoor unit is mounted right outside the master bedroom and the bathroom. My wife even said if you don't actually know it is running you would think it is turned off while we were standing outside directly underneath the condenser.

The system removes significant humidity which I was concerned with since it is oversized.

My tip: be sure to install the indoor heads with the drain line at the bottom of the bundle through the wall hole to insure proper drainage, and as has been said many times, drill the wall holes at a good outward downward angle from inside. The more the better in my opinion.

I moved the drain line from the factory location on each indoor head to the opposite side so I only had to make one wall hole. That was a pita on each unit.

I am still completing the finishing touches but wanted to post some pics of my project up to this point.

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walrus

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Nov 12, 2008
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Maine
If you have 4- 9k indoor units, how is a 30k outdoor unit over sized? Not sure how the math works on that?

Thats a lot of connections in a tight space, looks good.
 

yeldogt

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Jan 2, 2012
Messages
18,184
If you have 4- 9k indoor units, how is a 30k outdoor unit over sized? Not sure how the math works on that?

Thats a lot of connections in a tight space, looks good.

Maybe overall amount needed for the house is under 30k ?

I have three 12's on my hyper heat 30k. They will actually produce more than 12 in heat mode -- and I think the unit will run at 110%. The idea is to size the unit so running in the 60-80% most of the time

Companies are coming out with 6k heads -- 9k is a lot when you central cool a house for a bedroom.
 
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SALIV8

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Dec 11, 2008
Messages
2,114
Location
chicago and s/w michigan
Update:
Just (almost) finished installing another 3 zone Gree Vireo+ (9k,9k,9k idu and 24k odu) 21 seer system on the second floor. Very happy with the performance so far.

Last project to complete this install is the drain line PVC when the temps warm back up.
 
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SALIV8

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Joined
Dec 11, 2008
Messages
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Location
chicago and s/w michigan
Hopefully these systems last for years.

Once I finish the PVC drain lines, and I'm confident the systems don't have any issues, I will hide the line sets with some color matched aluminum covers.
 

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bash_brannigan

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Jan 31, 2014
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65
Location
Houston, TX
Do you mind me asking whether the brick is a single course (fascia over wood frame house)? How did you anchor to the brick wall. I am about to mount a condenser to my brick fascia wall and thinking I need to somehow find a way to drill through to the 2x6 studs. I can't find anything online about the strength of a single course of bricks for this kind of thing.
 

PoorOwner

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Feb 10, 2007
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Location
CA
good looking install, but would it be easy to shoehorn in the lineset covers later?
 
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SALIV8

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Joined
Dec 11, 2008
Messages
2,114
Location
chicago and s/w michigan
Do you mind me asking whether the brick is a single course (fascia over wood frame house)? How did you anchor to the brick wall. I am about to mount a condenser to my brick fascia wall and thinking I need to somehow find a way to drill through to the 2x6 studs. I can't find anything online about the strength of a single course of bricks for this kind of thing.

Not at all. Ask away.

My bldg is multiple courses of brick, I think 3 wide based on core depth. Its a masonry only exterior. The wall anchors that were shipped with the heavy duty wall mount bracket are made for brick. At first I was concerned with the weight (~150#) hanging there but I installed 7 anchors per wall mount and 20-25# per anchor is more than sufficient loading to me. I also hung and bounced a bit on each i dividul bracket arm and I weigh 230# so im confident they are secure.
 
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htmdude57

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Apr 28, 2014
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173
Location
Hudson Valley, New York
You said in the original post that the indoor units are oversized for the rooms, but the smallest Grees were 9K? Are they causing any problems? I too, have been worrying about buying 7-9k indoor units. (I know mitsubishi has 6k, but mitsubishi is much more $). My 12 x 12 bedroom is comfortable with a 5k window unit. Can a 9k run at a lesser output without causing any problem? freezing up the coil?
 
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SALIV8

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Dec 11, 2008
Messages
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Location
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You said in the original post that the indoor units are oversized for the rooms, but the smallest Grees were 9K? Are they causing any problems? I too, have been worrying about buying 7-9k indoor units. (I know mitsubishi has 6k, but mitsubishi is much more $). My 12 x 12 bedroom is comfortable with a 5k window unit. Can a 9k run at a lesser output without causing any problem? freezing up the coil?

No problems at all whatsoever with the 9ks. We have two bedrooms that are 12x12 as well and they've been awesome so far.

I would suggest double checking your preferred systems specs to be sure the inverter compressor can ramp down to a low output (I think my Grees ramp down to a lowest output at 3k or thereabouts.)

However, the nice thing about the oversize is for heat which my wife and I are enjoying so far with outdoor temps in the 30s. Our gas bill is not cheap with old inefficient HW radiator heat so running these only so far are nice. We'll see how much it impacts our electric bill soon.

We hope they continue to perform with our typically rough Chicago winters. They're rated to -4F but not sure the output at those temps will be sufficient. We'll see.
 

yeldogt

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Jan 2, 2012
Messages
18,184
The goal with a mini multi head system is to have the compressor running in the 65-80% range for max efficiencies. I was told they achieve max as they near 80% .. some units can go above 100%. The compressors can only go so low -- the challenge for the systems is when heads are off and it's trying to supply a single head that's call for a level lower than possible. That's why typically you don't want any head off.

Efficiency is relative. While the multi head units don't achieve the same max efficiency levels for the reasons above -- the single head units again need that 80% range to hit the high mark. Mitsubishi has been working to get smaller and smaller heads -- but it makes for an expensive and complex system.

On my new build -- I'm trying to decide on how bets to do mine. One larger multi -- or a smaller one and a single.
 
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SALIV8

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Dec 11, 2008
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Location
chicago and s/w michigan
Some updates...

Units are running good so far so decided to start the lineset cover project.

I tested a couple different lineset cover options and decided what's best for me. I'm interested in future accessibility, uv, and minor/medium impact resistance. So I ultimately decided on outdoor rated insulation jacketing.

This is an ongoing project (which is not complete yet) but so far I'm happy and the wife likes it also.

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aunsafe2015

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Joined
Apr 2, 2016
Messages
436
Location
Northern VA
Some updates...

Units are running good so far so decided to start the lineset cover project.

I tested a couple different lineset cover options and decided what's best for me. I'm interested in future accessibility, uv, and minor/medium impact resistance. So I ultimately decided on outdoor rated insulation jacketing.

This is an ongoing project (which is not complete yet) but so far I'm happy and the wife likes it also.

Before:
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How did winter performance end up being? Did you use exclusively mini split heating or did you have to resort to oil/gas on cold days?
 
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SALIV8

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Dec 11, 2008
Messages
2,114
Location
chicago and s/w michigan
Winter performance was awesome down to 26-28* F sustained outdoor temps. Much colder than that we needed the radiators for our preferred indoor temps of about 70*

I sized the systems for cooling, however, we enjoyed the slight oversizing for the winter and shoulder months which saved us good money on the gas bills.

Very happy with the systems so far. Hopefully they last many years.
 

fitter30

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Jun 23, 2019
Messages
2,960
Location
Peace Valley,mo
Installed two- two ton 3 -9k wall units per unit in my house. Gree makes Gibson by nordyne. Put in two systems for back up if one has a problem because im in a very rural area. Same specs as your units. Been running for almost 4 years on problems so for. With all mini splits they get dirty in a year or two need blower wheels removed to clean, when units go into defrost there is no back up heat and the condenser has a split coil that has to be split to clean. And found out the hard way to hook a shop vac to the drains outside just to **** any scum that may have accumulated every two three mouths. Only takes a few minutes. Use a ventless propane fireplace for backup heat and exteme cool weather to help out.
 
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SALIV8

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Dec 11, 2008
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Thanks for the heads up fitter.

ill admit I'm not happy if my odu has a split coil, but I'm planning on using the foam cleaner so hopefully I don't have to split it to clean it?
 
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SALIV8

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chicago and s/w michigan
Photobucket *****!
 

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