Been a while since I posted here but I always received good advise here.
I am having a 36K Mitsubishi Extreme dual zone air conditioner and heat pump installed and had a few questions. The Ac will be done by a licensed contractor but I am responsible for the Ac and the Disconnect.
The model is MXZ-4C36NAHZ
From what I can see on their PDF it needs 208 / 230V,1-Phase, 60 Hz with the Maximum breaker size being 50 Amp.
A few years ago when I redid the basement I put in a Murray sub panel that has nothing currently connected to it. It is wired to the main panel on a 60 Amp breaker and has passed inspection already. I installed it just for this purpose.
Can I just leave the breaker in the Main Panel at 60 AMP, put a 50 AMP breaker in the Murray sub panel, wire it to the Disconnect with copper Romex 4-3 NM-B = 70 amps or Romex 4-2 NM-B = 70 amps
(Near as I can tell from the specs the inside unit is DC powered and doesn't need 110 so neutral would not be needed correct? )
Also since I'm putting a 50 Amp breaker in the sub panel is there any need for a fused disconnect or will an unfused model be sufficient.
Distance from Sub panel to outside is not more than 10 feet as sub panel is inside direct;y opposite where I antiquated the Air Conditioner would be installed
Would NM be the correct choice for the wire type or would THNN in conduit be better?