2-zone ductless mini-split electrical work


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Old 12-02-13, 06:08 PM
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2-zone ductless mini-split electrical work

I am installing a 2-zone ductless mini-split system. I am doing the majority of work myself before the HVAC vacuum test and refrigerant charge.

I want to ensure things run properly, and need some guidance on the electrical portion from the box to the outdoor unit. Here's the specs of my mini-split system:

Power source: 230v - 60 Hz 1 Ph
Design pressure: 550 high, 340 Low
Outdoor Fan motor load: 0.74 A
Compressor load: 8.0 A
Minimum circuit ampacity: 11.0 A
Max Fuse: 15.0 A

I just want to make sure my wiring from the circuit breaker box to the service disconnect to the unit is proper.

What breakers should I use at the breaker box? What gauge wire should I use from the breaker box to the service disconnect (~12')?

What type of service disconnect should I use, and gauge of whip from the disconnect to the unit?

These may be basic questions, but I'm a newbie.

Thanks for any input!
 
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Old 12-02-13, 06:15 PM
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Welcome,

Your information from the nameplate states you need a minimum circuit ampacity of 11. A 14-2 cable will be good for 15 amps which is the smallest breaker you can get. A 30 amp AC disconnect is all you need. The flex can be wired with #14 with 2 blacks or a black and a red along with a green or bare grounding conductor.

You will use a 15 amp two pole breaker.
 
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Old 12-07-13, 12:35 PM
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That's exactly what I was curious about.

Thanks for your input!
 
 

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