Mini Split 14AWG Control Wire Question

[SNS]

We have purchased a two zone LG mini split and I am pretty straight on all the power requirements for the outdoor units and those coming to the indoor units. My question is about breaking up the power/signal wires running from the OD unit to the ID units; that is what I am seeking input on.

I will have two head units, so a power run to each and a control run to each. I've read in their installation manual that you can run 14/4 up to 132' - but I have also read both in the installation manual and elsewhere that it's better to separate the power and signal lines. This entire project is a lot of work, and in getting conflicting information and am thinking to just choose the most conservative path by running them apart; power lines with the line sets and condensate drain and then the control lines in their own hard conduit, separate wall penetrations, routed separately from the line sets/power to the head units, all the way, etc.

Right now I am planning on using 14-2C Type MC for the power connection and them am planning to run some other 14AWG (perhaps shielded) for the control lines.

My questions:

• Is my taking such an approach a good idea to remove the potential of signal conflicts or is it overblown?
• Since the 14AWG is only for controls, can I be more flexible on the wire type (shielded 14AWG speaker wire)?

Thanks for your help!

//sns

 

[Dennis Alwon]

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