Help me Install 3 EG4 Mini Split Solar Heat Pumps

[ginmtb]

I pulled the top off and checked, looked like all connections were good. I will bypass the MC4 connectors on the outside and connect directly to the MC4 connectors on the inside and put my tester around the wires to see if voltage is passing through. Then it will be on the phone with signature solar tech support… or maybe EG4.

 

[justgary]

I pulled the top off and checked, looked like all connections were good. I will bypass the MC4 connectors on the outside and connect directly to the MC4 connectors on the inside and put my tester around the wires to see if voltage is passing through. Then it will be on the phone with signature solar tech support… or maybe EG4.

View attachment 208398

Did you verify that the DC polarity is correct? It probably won't do anything if the DC is reversed.

 

[Plum Crazy Rob]

Did you verify that the DC polarity is correct? It probably won't do anything if the DC is reversed.

I was curious about but didn't want to be the one lol . The old non DIY units had blue = positive, black negative...is that an inline fuse as well, while we are going down this road???

 

[ginmtb]

I was curious about but didn't want to be the one lol . The old non DIY units had blue = positive, black negative...is that an inline fuse as well, while we are going down this road???

Yes, I checked - both with the lid off and prior to that. The positive wire is still blue inside and that is connected to the MC4 connector connected to my red positive line. With the lid off I traced the blue line connected to a circuit board via a spade connector.

That is an inline fuse... I have tested it while that is connected and without it. Is there anything else I should be concerned with regarding that fuse?

Thanks @justgary and @Plum Crazy Rob, don't assume I know anything lol.

 

[ginmtb]

Okay I think the problem has been solved! Look at my voltage reading again… sonuva! My wires are flipped and that is reading a negative voltage. I did change MC4 connectors so clearly I mixed those up when I flipped them ugh what a rookie mistake! New MC4 connectors ordered and I will flip the two.

 

[Plum Crazy Rob]

Look at my voltage reading again… sonuva!

Good job by Gary, I mean we know SS would have asked that too. Happens to everyone, just glad 99.99999 % chance problem is solved ...

 

[justgary]

Thanks @justgary and @Plum Crazy Rob, don't assume I know anything lol.

No assumptions made at all. I don't mind having someone remind me to check the basics any time I start diagnosing problems, so I assumed you wouldn't either.

I'm glad it is fixed!

 

[EG4TechSolutionsTeam]

Glad to see that the issue was resolved!

 

[mrxsolar]

are we able to use mr.cool's extended linesets on any of the EG4 systems?

 

[Supervstech]

are we able to use mr.cool's extended linesets on any of the EG4 systems?

That is a good question, since the linesets likely use aeroquip compatible sealed ends, the lines would be precharged for the system size... should be ok, if the equipment supports the line length.

 

[HalfBaked]

OK So ... Copper Bending

I have to bend the copper tubing coming out of the 12k unit so that it exits 180* out the other side.

Do you think it is best to bend it end over end, or 180* counter clockwise around the bottom?

View attachment 149583

I am currently taking steps to install this 12k unit and as shown, the tubing is routed backwards from the right side and has to be bent. I am deathly afraid of effing this up.
Can anyone give me a clue about what worked for you?

 

[Supervstech]

I am currently taking steps to install this 12k unit and as shown, the tubing is routed backwards from the right side and has to be bent. I am deathly afraid of effing this up.
Can anyone give me a clue about what worked for you?

Usually, the lines attached to the blower are wrapped in a spring.
They prevent kinks.
If not, and you have to bend a lot...
Get bending springs for the size tubing.

 

[MrM1]

I am currently taking steps to install this 12k unit and as shown, the tubing is routed backwards from the right side and has to be bent. I am deathly afraid of effing this up.
Can anyone give me a clue about what worked for you?

And/Or purchase a set of Bending Mandrels

 

[Supervstech]

And/Or purchase a set of Bending Mandrels

It is exceedingly difficult to get bending tools behind the unit...

 

[HalfBaked]

I was going to use a cheap bending tool since I can't see how to use a spring while the tubing have permanent connectors. It seems the bending tool has enough room if it's used before mounting the unit. Or am I missing something?

 

[Supervstech]

I was going to use a cheap bending tool since I can't see how to use a spring while the tubing have permanent connectors. It seems the bending tool has enough room if it's used before mounting the unit. Or am I missing something?

They thread on like a keyring

 

[HalfBaked]

They thread on like a keyring

Ok, I did a little research on them earlier and I didn't see that. They were either slid over the pipe end or into the pipe. I'll look into that, thanks.

 

[Supervstech]

Ok, I did a little research on them earlier and I didn't see that. They were either slid over the pipe end or into the pipe. I'll look into that, thanks.

Of course they are much easier to put on without an end on it, but they can be threaded on and off.

 

[Plum Crazy Rob]

I don't know, am asking since I only needed 90 degrees (lucky) on all 3 of my instls. Is our goal primarily BENDING or ROTATE/TWIST it over. @Supervstech ??

 

[HalfBaked]

What do we think of this method? Start at 13:10

 

[Supervstech]

What do we think of this method? Start at 13:10

Yes, rotating the lines is a simple pricess.
Bending from there is where you need tools, or SKILL.

 

[ginmtb]

Okay I think the problem has been solved! Look at my voltage reading again… sonuva! My wires are flipped and that is reading a negative voltage. I did change MC4 connectors so clearly I mixed those up when I flipped them ugh what a rookie mistake! New MC4 connectors ordered and I will flip the two.

View attachment 208540

Okay, closing the loop on this one! Finally got a chance to flip things and we are good to go! Thanks all for your help!

 

[Plum Crazy Rob]

HVAC influencer installed one. Now we have to train a whole new audience how it works lol

Plugged the forum here in comments.

 

[SolarScott]

So I finally got to see how my two 24K mini splits would work cooling my 40 x 60 shop with 20' ceilings. One inch of spray foam
on all walls and sliding door. I have not addressed my door sealing issue yet, but it leaves me with at least 60 square inches of openings
for air leakage. I hope to address that soon. Yesterday, with temps in the 80's, the units ran all day, no clouds, and the shop got down to 65 degrees. Needles to say, I love my mini splits......cool shop no charge for the A.C. I guess I am going to have to hook up grid A.C. and run
the A.C. limiter to keep them going when clouds pass over. Today I had some no restart issues. Thanks SS for making my life easier.

 

[Zwy]

So I finally got to see how my two 24K mini splits would work cooling my 40 x 60 shop with 20' ceilings. One inch of spray foam
on all walls and sliding door. I have not addressed my door sealing issue yet, but it leaves me with at least 60 square inches of openings
for air leakage. I hope to address that soon. Yesterday, with temps in the 80's, the units ran all day, no clouds, and the shop got down to 65 degrees. Needles to say, I love my mini splits......cool shop no charge for the A.C. I guess I am going to have to hook up grid A.C. and run
the A.C. limiter to keep them going when clouds pass over. Today I had some no restart issues. Thanks SS for making my life easier.

Where did you mount the inside unit? I've been debating high on the wall or down low for easier cleaning of the evaporator coil. 18 foot ceiling.

I'm planning on two 24K units. I'm not certain if I want dual head either. I will still have the older lower SEER rated 2 ton unit with air handler for backup or additional quick cooling if needed.