ᐅ Multi-utility supply line – Can the gas connection be used for the air conditioning system?

Dear forum members,

I would like to prepare my house, which is going to be built, for a split air conditioning system. A four-way utility conduit is planned to lead into the utility room. Since we will not be using gas, I am asking if it is allowed to use the last available opening for the air conditioning—either for the smaller refrigerant line or the larger vapor line (I hope I understood the cycle correctly :rolleyes 🙂. According to my calculations, I would only need to leave one additional smaller hole through the basement exterior wall.

Because this is a prefabricated house, the manufacturer is reluctant to compromise the building’s thermal envelope by running empty conduits to the outside if they are meant for condensate drainage (upper and ground floors). Perhaps someone has experience or advice on this? As far as I understand, you can hardly run condensate water through shafts reaching down to the basement, can you? Would it then have to drip into a sink or similar?

Thanks for your input,
Reltaw

Well, cutting open the refrigerant lines is not ideal either. How large is the fourth conduit in your multi-utility entry?

You can, of course, connect the condensate to any drain pipe you like.

We also use our gas conduit for another purpose. Is the house already built, or at least the basement? Maybe you could simply extend something through it as well. We have a timber frame house, and neither the manufacturer nor we are in favor of penetrating the building’s thermal envelope. Therefore, in addition to the empty conduit, we had two PVC pipes embedded in the concrete slab and extended outside—one for the outdoor unit of the heat pump and one for a future supply line for a wallbox from the carport to the utility room.

The descriptions mention DN 25, which I cannot "translate." For the other three categories, there is still a measurement in millimeters included.

DN25 is already tight, but both copper pipes with insulation should fit through.

Thank you!
How many millimeters (inches) could that be?
Is it allowed? I have the feeling that the utility providers refer to relatively strict regulations.