Sorry for the rookie question, but i recently got the danfoss refrigerant slider app to help with day to day pressure checks ect.

I have asked a few other engineers that i work with and no one can seem to give me a direct answer and it seems they dont really understand it either.

Basically when you choose the gas type you can select either bubble or dew, what am i supposed to be using to work out the correct running pressures?

Any help would be much appreciated

Rik