Good morning, he asked for help to connect a mini split diffuser that is "cold only" to an external unit "cold heat" no matter that it only works in "cold only". the two (diffuser as an external unit) are of the "Disa" brand. How can I do to connect them? first of all, Thanks. ..

Hi Vox, here I send you a basic diagram that is not from that team, but I'm sure it will help very well. Anyway if you have any questions, you can comment. Also, you can locate on the electronic board a neutral connection and the phase that comes out of the compressor relay and take out a cable if it is not already connected from each of the two places mentioned above and take them to the connection strip of the outdoor unit (RT1), which I hope is already set and configured. (N) neutral on (RT1) with a common cable feeding the capacitors of the fan and the compressor in the outdoor unit. Let's call the remaining wire, let's call it phase, this would be the one that comes out of the compressor relay on the electronic board and would also carry the electrical signal to the outdoor unit strip (RT1) but now to the letter (L) marked on the strip itself ( RT1). From that point we would create a common that would join with the common cable of the compressor and the common cable of the fan or fan of the outdoor unit. S @ lu2 friovega63

Hello, how are you? If the diffuser you are referring to is the indoor unit, it has 3 neutral N line and T or 1.2 .T cables and so you connect the outdoor unit with regards.