Mini-split A/C install

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James L said:
Wherever you run your Freon lines, run your electrical alongside it
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Supply circuit likely needs to go some other direction or at least beyond the inside unit.
petersonra said:
I think on these kind of units the freon does not have to go outside at all. It goes from the part that is outside to the part that is inside through a hole in the wall.
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??

It has to go to the outdoor unit and then back through the second tube to the indoor unit(s), it is a closed loop system.
 
petersonra said:
There is a crawl space but it is very difficult to get at
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But can it be "fished"?

I've shoved PVC pipe across crawlspaces and attics that I can't crawl through many times. Might use it just for it's rigidness and pull it back out or shove it in and use it to pull through - depends on situation.
 
kwired said:
But can it be "fished"?

I've shoved PVC pipe across crawlspaces and attics that I can't crawl through many times. Might use it just for it's rigidness and pull it back out or shove it in and use it to pull through - depends on situation.
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The plumbers once ran a water line that way through the crawl space. I suppose it could be done. The guy I talked to did not seem to think much of the idea though.
 
petersonra said:
I am not sure exactly what he had in mind but I suspect his plan was more to pull it behind the siding than to try and stuff it up there.
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Yeah, good luck with that. He sounds like the kind of HVAC guy that needs to stick to HVAC and stay away from electrical.

kwired said:
I've shoved PVC pipe across crawlspaces and attics that I can't crawl through many times. Might use it just for it's rigidness and pull it back out or shove it in and use it to pull through - depends on situation.
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Sounds good to me. Done it plenty of times too. I don't think your HVAC guy wants to crawl in there.

-Hal
 
Both the compressor (the outside part) and the evaporator (the inside part) need power. Most you can feed the incoming power to either end and send it through to (with the freon pipes) to the other.

Note the disconnect requirements inherent in light of this.
 
rnatalie said:
Both the compressor (the outside part) and the evaporator (the inside part) need power. Most you can feed the incoming power to either end and send it through to (with the freon pipes) to the other.

Note the disconnect requirements inherent in light of this.
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Yes, no, maybe.... you need to read NC interpretations. A mini split is considered one unit and therefore the outside unit gets fed and no need for a disconnect on the inside unit unless the manufacturer requires it.... This is NC interpretation-- I believe other states are going that way also.

NC Interpretations

State Electrical Code and Interpretations | OSFM

Information related to the State Electrical Code and Interpretations in North Carolina
www.ncosfm.gov www.ncosfm.gov


This is for the mini split

 
Coppersmith said:
PVC is code compliant to use, but for horizontal runs on walls above ground, it gets saggy and looks horrible and not very professional IMHO.
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Has anyone used the new fiberglass conduit? The mfg says it has a much greater span ability between supports than PVC, shouldn't get saggy.
 
Dennis Alwon said:
Yes, no, maybe.... you need to read NC interpretations. A mini split is considered one unit and therefore the outside unit gets fed and no need for a disconnect on the inside unit unless the manufacturer requires it.... This is NC interpretation-- I believe other states are going that way also.

NC Interpretations

State Electrical Code and Interpretations | OSFM

Information related to the State Electrical Code and Interpretations in North Carolina
www.ncosfm.gov www.ncosfm.gov


This is for the mini split

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IMO NEC alone (no other AHJ explanations needed) requires a disconnect at the outdoor unit of a minisplit - outdoor unit is an art 440 application but:

Indoor unit is not a 440 application - does not contain a hermetic compressor. Instead is just a motor operated appliance so we need to look at 422 for requirements. I have never seen one that is larger than 1/8 HP or 300 VA, if it would have resistance heat that would be the exception, don't think I've seen that either in a "minisplit" though. That small capacity of a unit doesn't require disconnecting means within sight of the appliance
 
rnatalie said:
Both the compressor (the outside part) and the evaporator (the inside part) need power. Most you can feed the incoming power to either end and send it through to (with the freon pipes) to the other.

Note the disconnect requirements inherent in light of this.
Click to expand...

No. I've never seen a split system where you can feed power to the indoor unit. Power is provided to the outdoor condensing unit through a disconnect. Then a two or three conductor cable (UF or TC) is run from the condenser to the indoor unit along with the service lines. That cable provides power and control to the indoor unit.

-Hal
 
hbiss said:
No. I've never seen a split system where you can feed power to the indoor unit. Power is provided to the outdoor condensing unit through a disconnect. Then a two or three conductor cable (UF or TC) is run from the condenser to the indoor unit along with the service lines. That cable provides power and control to the indoor unit.
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Agreed, especially systems with multiple room units like the one I recently fed a 30a circuit to.
 
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