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Thread: Mini split wiring
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11-09-2021, 03:29 PM #1
Mini split wiring
This should be an easy one for you guys?
I want to buy a mini-split AC system, but not as a complete system. I want to shop around for separate used indoor evaporators and exterior condenser units. They seem to be much cheaper this way. I don't want to get into the refrigerant and different capacities, I understand all of that from my refrigeration training.
My question is about the wiring between the evaporator and condenser units.
I know that this comprises power and a communication wire.
What is the communications wire? I understand that it is the control between the indoor and outdoor units, but are they all standard?
For instance, is it a pair of thermostatic contacts that open and close with the demand of the indoor unit, or a switched 24vdc demand signal, a 110vac (or220vac) demand signal, or something more complicated. Is it a standard throughout the industry?
Thank you in anticipation...
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11-09-2021, 06:01 PM #2
Re: Mini split wiring
as these unit work on pcbs and programmed chips i don't think you can mix and match unit just to save money
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12-09-2021, 07:09 AM #3
Re: Mini split wiring
Wow, this is interesting. 75 views and no one knows!?
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12-09-2021, 07:28 AM #4
Re: Mini split wiring
the signals on interconnecting wires are pulses on inverter ac units this is why you can not mix units
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12-09-2021, 08:11 AM #5
Re: Mini split wiring
What about older units which don't use inverter technology?
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12-09-2021, 03:38 PM #6
Re: Mini split wiring
if they are working on relays and contactors then you can fit your own type of control thermostat and voltage to suit the unit you buy
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13-09-2021, 01:15 AM #7
Re: Mini split wiring
So, in summary, none of you have a clue?
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13-09-2021, 09:32 AM #8
Re: Mini split wiring
If you supply the makes and models you’re thinking of getting you’ll get the answers you want !
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13-09-2021, 07:33 PM #9
Re: Mini split wiring
they are not standard it will depend on the manufacture but from a cost point it will be cheaper to buy a compleat system rather than try to mix different unit
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13-09-2021, 09:15 PM #10
Re: Mini split wiring
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14-09-2021, 06:18 PM #11
Re: Mini split wiring
I never received an answer to my question. Is there any point in moving on an asking a question on inverter compressors and it's relation to subcooling? I probably shouldn't hold my breath? Or you could all dazzle me with your brilliance and help me?
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15-09-2021, 07:00 PM #12
Re: Mini split wiring
having answered your questions and you not being able to understand the answers i think you must be the rudest people ever to post
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15-09-2021, 07:30 PM #13
Re: Mini split wiring
Enough for me, member shut down and thread closed, sorry folks.
Brian - Newton Abbot, Devon, UK
Retired March 2015